Improve javadoc to clatify role of read-only properties
noted by BluePhelix@web.de git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130985 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
parent
1a2f50cb26
commit
2298039999
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@ -1,5 +1,5 @@
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/*
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/BeanMap.java,v 1.16 2003/02/19 20:14:25 scolebourne Exp $
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* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/BeanMap.java,v 1.17 2003/03/03 19:41:29 scolebourne Exp $
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* ====================================================================
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*
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* The Apache Software License, Version 1.1
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@ -82,7 +82,7 @@ import java.util.Set;
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* property is considered non existent in the Map
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*
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* @since Commons Collections 1.0
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* @version $Revision: 1.16 $ $Date: 2003/02/19 20:14:25 $
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* @version $Revision: 1.17 $ $Date: 2003/03/03 19:41:29 $
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*
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* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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* @author Stephen Colebourne
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@ -96,13 +96,13 @@ public class BeanMap extends AbstractMap implements Cloneable {
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private transient HashMap types = new HashMap();
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/**
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* An empty array. Used to invoke accessors via reflection.
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* An empty array. Used to invoke accessors via reflection.
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*/
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public static final Object[] NULL_ARGUMENTS = {};
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/**
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* Maps primitive Class types to transformers. The transformer
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* transform strings into the appropriate primitive wrapper.
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* Maps primitive Class types to transformers. The transformer
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* transform strings into the appropriate primitive wrapper.
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*/
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public static HashMap defaultTransformers = new HashMap();
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@ -178,17 +178,17 @@ public class BeanMap extends AbstractMap implements Cloneable {
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//-------------------------------------------------------------------------
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/**
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* Constructs a new empty <Code>BeanMap</Code>.
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* Constructs a new empty <code>BeanMap</code>.
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*/
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public BeanMap() {
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}
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/**
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* Constructs a new <Code>BeanMap</Code> that operates on the
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* specified bean. If the given bean is <Code>null</COde>, then
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* this map will be empty.
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* Constructs a new <code>BeanMap</code> that operates on the
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* specified bean. If the given bean is <code>null</COde>, then
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* this map will be empty.
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*
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* @param bean the bean for this map to operate on
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* @param bean the bean for this map to operate on
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*/
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public BeanMap(Object bean) {
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this.bean = bean;
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@ -199,29 +199,28 @@ public class BeanMap extends AbstractMap implements Cloneable {
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//-------------------------------------------------------------------------
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/**
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* Clone this bean map using the following process:
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* Clone this bean map using the following process:
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*
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* <ul>
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* <li>If there is no underlying bean, return a cloned BeanMap without a
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* bean.
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* <ul>
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* <li>If there is no underlying bean, return a cloned BeanMap without a
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* bean.
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*
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* <li>Since there is an underlying bean, try to instantiate a new bean of
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* the same type using Class.newInstance().
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* <li>Since there is an underlying bean, try to instantiate a new bean of
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* the same type using Class.newInstance().
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*
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* <li>If the instantiation fails, throw a CloneNotSupportedException
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* <li>If the instantiation fails, throw a CloneNotSupportedException
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*
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* <li>Clone the bean map and set the newly instantiated bean as the
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* underyling bean for the bean map.
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* <li>Clone the bean map and set the newly instantiated bean as the
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* underyling bean for the bean map.
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*
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* <li>Copy each property that is both readable and writable from the
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* existing object to a cloned bean map.
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* <li>Copy each property that is both readable and writable from the
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* existing object to a cloned bean map.
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*
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* <li>If anything fails along the way, throw a
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* CloneNotSupportedException.
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* <li>If anything fails along the way, throw a
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* CloneNotSupportedException.
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*
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* <ul>
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**/
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* <ul>
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*/
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public Object clone() throws CloneNotSupportedException {
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BeanMap newMap = (BeanMap)super.clone();
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@ -272,16 +271,16 @@ public class BeanMap extends AbstractMap implements Cloneable {
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}
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/**
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* Puts all of the writeable properties from the given BeanMap into this
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* BeanMap. Read-only properties will be ignored.
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* Puts all of the writeable properties from the given BeanMap into this
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* BeanMap. Read-only and Write-only properties will be ignored.
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*
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* @param map the BeanMap whose properties to put
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* @param map the BeanMap whose properties to put
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*/
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public void putAllWriteable(BeanMap map) {
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Iterator readableKeys = map.readMethods.keySet().iterator();
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while(readableKeys.hasNext()) {
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while (readableKeys.hasNext()) {
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Object key = readableKeys.next();
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if(getWriteMethod(key) != null) {
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if (getWriteMethod(key) != null) {
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this.put(key, map.get(key));
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}
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}
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@ -289,13 +288,13 @@ public class BeanMap extends AbstractMap implements Cloneable {
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/**
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* This method reinitializes the bean map to have default values for the
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* bean's properties. This is accomplished by constructing a new instance
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* of the bean which the map uses as its underlying data source. This
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* behavior for <code>clear()</code> differs from the Map contract in that
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* the mappings are not actually removed from the map (the mappings for a
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* BeanMap are fixed).
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**/
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* This method reinitializes the bean map to have default values for the
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* bean's properties. This is accomplished by constructing a new instance
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* of the bean which the map uses as its underlying data source. This
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* behavior for <code>clear()</code> differs from the Map contract in that
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* the mappings are not actually removed from the map (the mappings for a
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* BeanMap are fixed).
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*/
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public void clear() {
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if(bean == null) return;
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@ -310,44 +309,52 @@ public class BeanMap extends AbstractMap implements Cloneable {
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}
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/**
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* Returns true if the bean defines a property with the given name.
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* The given name must be a <Code>String</Code>; if not, this method
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* returns false. This method will also return false if the bean
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* does not define a property with that name.
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* Returns true if the bean defines a property with the given name.
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* <p>
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* The given name must be a <code>String</code>; if not, this method
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* returns false. This method will also return false if the bean
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* does not define a property with that name.
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* <p>
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* Write-only properties will not be matched as the test operates against
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* property read methods.
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*
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* @param name the name of the property to check
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* @return false if the given name is null or is not a <Code>String</Code>;
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* false if the bean does not define a property with that name; or
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* true if the bean does define a property with that name
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* @param name the name of the property to check
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* @return false if the given name is null or is not a <code>String</code>;
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* false if the bean does not define a property with that name; or
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* true if the bean does define a property with that name
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*/
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public boolean containsKey(Object name) {
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Method method = getReadMethod( name );
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Method method = getReadMethod(name);
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return method != null;
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}
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/**
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* Returns true if the bean defines a property whose current value is
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* the given object.
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* Returns true if the bean defines a property whose current value is
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* the given object.
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*
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* @param value the value to check
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* @return false true if the bean has at least one property whose
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* current value is that object, false otherwise
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* @param value the value to check
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* @return false true if the bean has at least one property whose
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* current value is that object, false otherwise
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*/
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public boolean containsValue(Object value) {
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// use default implementation
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return super.containsValue( value );
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return super.containsValue(value);
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}
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/**
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* Returns the value of the bean's property with the given name.
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* The given name must be a {@link String} and must not be
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* null; otherwise, this method returns <Code>null</Code>.
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* If the bean defines a property with the given name, the value of
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* that property is returned. Otherwise, <Code>null</Code> is
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* returned.
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* Returns the value of the bean's property with the given name.
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* <p>
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* The given name must be a {@link String} and must not be
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* null; otherwise, this method returns <code>null</code>.
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* If the bean defines a property with the given name, the value of
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* that property is returned. Otherwise, <code>null</code> is
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* returned.
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* <p>
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* Write-only properties will not be matched as the test operates against
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* property read methods.
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*
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* @param name the name of the property whose value to return
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* @return the value of the property with that name
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* @param name the name of the property whose value to return
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* @return the value of the property with that name
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*/
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public Object get(Object name) {
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if ( bean != null ) {
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}
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/**
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* Sets the bean property with the given name to the given value.
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* Sets the bean property with the given name to the given value.
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*
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* @param name the name of the property to set
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* @param value the value to set that property to
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* @return the previous value of that property
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* @throws IllegalArgumentException if the given name is null;
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* if the given name is not a {@link String}; if the bean doesn't
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* define a property with that name; or if the bean property with
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* that name is read-only
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* @param name the name of the property to set
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* @param value the value to set that property to
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* @return the previous value of that property
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* @throws IllegalArgumentException if the given name is null;
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* if the given name is not a {@link String}; if the bean doesn't
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* define a property with that name; or if the bean property with
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* that name is read-only
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*/
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public Object put(Object name, Object value) throws IllegalArgumentException, ClassCastException {
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if ( bean != null ) {
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}
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/**
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* Returns the number of properties defined by the bean.
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* Returns the number of properties defined by the bean.
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*
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* @return the number of properties defined by the bean
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* @return the number of properties defined by the bean
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*/
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public int size() {
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return readMethods.size();
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/**
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* Get the keys for this BeanMap.
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* <p>
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* Write-only properties are <b>not</b> included in the returned set of
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* property names, although it is possible to set their value and to get
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* their type.
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*
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* @return BeanMap keys. The Set returned by this method is not
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* modifiable.
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* modifiable.
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*/
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public Set keySet() {
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return Collections.unmodifiableSet(readMethods.keySet());
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* Get the mappings for this BeanMap
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*
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* @return BeanMap mappings. The Set returned by this method
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* is not modifiable.
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* is not modifiable.
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*/
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public Set entrySet() {
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return Collections.unmodifiableSet(new AbstractSet() {
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* Returns the values for the BeanMap.
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*
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* @return values for the BeanMap. The returned collection is not
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* modifiable.
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* modifiable.
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*/
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public Collection values() {
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ArrayList answer = new ArrayList( readMethods.size() );
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* Returns the type of the property with the given name.
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*
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* @param name the name of the property
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* @return the type of the property, or <Code>null</Code> if no such
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* property exists
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* @return the type of the property, or <code>null</code> if no such
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* property exists
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*/
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public Class getType(String name) {
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return (Class) types.get( name );
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}
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/**
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* Convenience method for getting an iterator over the keys.
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* Convenience method for getting an iterator over the keys.
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* <p>
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* Write-only properties will not be returned in the iterator.
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*
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* @return an iterator over the keys
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* @return an iterator over the keys
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*/
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public Iterator keyIterator() {
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return readMethods.keySet().iterator();
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}
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/**
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* Convenience method for getting an iterator over the values.
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* Convenience method for getting an iterator over the values.
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*
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* @return an iterator over the values
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* @return an iterator over the values
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*/
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public Iterator valueIterator() {
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final Iterator iter = keyIterator();
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}
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/**
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* Convenience method for getting an iterator over the entries.
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* Convenience method for getting an iterator over the entries.
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*
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* @return an iterator over the entries
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* @return an iterator over the entries
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*/
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public Iterator entryIterator() {
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final Iterator iter = keyIterator();
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//-------------------------------------------------------------------------
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/**
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* Returns the bean currently being operated on. The return value may
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* be null if this map is empty.
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* Returns the bean currently being operated on. The return value may
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* be null if this map is empty.
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*
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* @return the bean being operated on by this map
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* @return the bean being operated on by this map
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*/
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public Object getBean() {
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return bean;
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}
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/**
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* Sets the bean to be operated on by this map. The given value may
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* be null, in which case this map will be empty.
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* Sets the bean to be operated on by this map. The given value may
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* be null, in which case this map will be empty.
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*
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* @param newBean the new bean to operate on
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* @param newBean the new bean to operate on
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*/
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public void setBean( Object newBean ) {
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bean = newBean;
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//-------------------------------------------------------------------------
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/**
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* Returns the accessor for the property with the given name.
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* Returns the accessor for the property with the given name.
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*
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* @param name the name of the property
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* @return null if the name is null; null if the name is not a
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* {@link String}; null if no such property exists; or the accessor
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* method for that property
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* @param name the name of the property
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* @return null if the name is null; null if the name is not a
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* {@link String}; null if no such property exists; or the accessor
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* method for that property
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*/
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protected Method getReadMethod( Object name ) {
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return (Method) readMethods.get( name );
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}
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/**
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* Returns the mutator for the property with the given name.
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* Returns the mutator for the property with the given name.
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*
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* @param name the name of the
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* @return null if the name is null; null if the name is not a
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* {@link String}; null if no such property exists; null if the
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* property is read-only; or the mutator method for that property
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* @param name the name of the
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* @return null if the name is null; null if the name is not a
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* {@link String}; null if no such property exists; null if the
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* property is read-only; or the mutator method for that property
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*/
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protected Method getWriteMethod( Object name ) {
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return (Method) writeMethods.get( name );
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}
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/**
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* Reinitializes this bean. Called during {@link #setBean(Object)}.
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* Does introspection to find properties.
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* Reinitializes this bean. Called during {@link #setBean(Object)}.
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* Does introspection to find properties.
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*/
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protected void reinitialise() {
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readMethods.clear();
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}
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/**
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* Called during a successful {@link #put(Object,Object)} operation.
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* Default implementation does nothing. Override to be notified of
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* property changes in the bean caused by this map.
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* Called during a successful {@link #put(Object,Object)} operation.
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* Default implementation does nothing. Override to be notified of
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* property changes in the bean caused by this map.
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*
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* @param key the name of the property that changed
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* @param oldValue the old value for that property
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* @param newValue the new value for that property
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* @param key the name of the property that changed
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* @param oldValue the old value for that property
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* @param newValue the new value for that property
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*/
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protected void firePropertyChange( Object key, Object oldValue, Object newValue ) {
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}
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|
@ -681,17 +694,17 @@ public class BeanMap extends AbstractMap implements Cloneable {
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//-------------------------------------------------------------------------
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/**
|
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* Map entry used by {@link BeanMap}.
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* Map entry used by {@link BeanMap}.
|
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*/
|
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protected static class MyMapEntry extends DefaultMapEntry {
|
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private BeanMap owner;
|
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|
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/**
|
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* Constructs a new <Code>MyMapEntry</Code>.
|
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* Constructs a new <code>MyMapEntry</code>.
|
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*
|
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* @param owner the BeanMap this entry belongs to
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* @param key the key for this entry
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* @param value the value for this entry
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* @param owner the BeanMap this entry belongs to
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* @param key the key for this entry
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* @param value the value for this entry
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*/
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protected MyMapEntry( BeanMap owner, Object key, Object value ) {
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super( key, value );
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|
@ -699,10 +712,10 @@ public class BeanMap extends AbstractMap implements Cloneable {
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}
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/**
|
||||
* Sets the value.
|
||||
* Sets the value.
|
||||
*
|
||||
* @param value the new value for the entry
|
||||
* @return the old value for the entry
|
||||
* @param value the new value for the entry
|
||||
* @return the old value for the entry
|
||||
*/
|
||||
public Object setValue(Object value) {
|
||||
Object key = getKey();
|
||||
|
@ -716,18 +729,18 @@ public class BeanMap extends AbstractMap implements Cloneable {
|
|||
}
|
||||
|
||||
/**
|
||||
* Creates an array of parameters to pass to the given mutator method.
|
||||
* If the given object is not the right type to pass to the method
|
||||
* directly, it will be converted using {@link #convertType(Class,Object)}.
|
||||
* Creates an array of parameters to pass to the given mutator method.
|
||||
* If the given object is not the right type to pass to the method
|
||||
* directly, it will be converted using {@link #convertType(Class,Object)}.
|
||||
*
|
||||
* @param method the mutator method
|
||||
* @param value the value to pass to the mutator method
|
||||
* @return an array containing one object that is either the given value
|
||||
* or a transformed value
|
||||
* @throws IllegalAccessException if {@link #convertType(Class,Object)}
|
||||
* raises it
|
||||
* @throws IllegalArgumentException if any other exception is raised
|
||||
* by {@link #convertType(Class,Object)}
|
||||
* @param method the mutator method
|
||||
* @param value the value to pass to the mutator method
|
||||
* @return an array containing one object that is either the given value
|
||||
* or a transformed value
|
||||
* @throws IllegalAccessException if {@link #convertType(Class,Object)}
|
||||
* raises it
|
||||
* @throws IllegalArgumentException if any other exception is raised
|
||||
* by {@link #convertType(Class,Object)}
|
||||
*/
|
||||
protected Object[] createWriteMethodArguments( Method method, Object value ) throws IllegalAccessException, ClassCastException {
|
||||
try {
|
||||
|
@ -766,7 +779,7 @@ public class BeanMap extends AbstractMap implements Cloneable {
|
|||
* {@link Object#toString() toString()} method, and that string is
|
||||
* parsed into the correct primitve type using, for instance,
|
||||
* {@link Integer#valueOf(String)} to convert the string into an
|
||||
* <Code>int</Code>.<P>
|
||||
* <code>int</code>.<P>
|
||||
*
|
||||
* If no special constructor exists and the given type is not a
|
||||
* primitive type, this method returns the original value.
|
||||
|
@ -775,12 +788,12 @@ public class BeanMap extends AbstractMap implements Cloneable {
|
|||
* @param value the value to conert
|
||||
* @return the converted value
|
||||
* @throws NumberFormatException if newType is a primitive type, and
|
||||
* the string representation of the given value cannot be converted
|
||||
* to that type
|
||||
* the string representation of the given value cannot be converted
|
||||
* to that type
|
||||
* @throws InstantiationException if the constructor found with
|
||||
* reflection raises it
|
||||
* reflection raises it
|
||||
* @throws InvocationTargetExcetpion if the constructor found with
|
||||
* reflection raises it
|
||||
* reflection raises it
|
||||
* @throws IllegalAccessException never
|
||||
* @throws IllegalArgumentException never
|
||||
*/
|
||||
|
@ -805,38 +818,36 @@ public class BeanMap extends AbstractMap implements Cloneable {
|
|||
}
|
||||
|
||||
/**
|
||||
* Returns a transformer for the given primitive type.
|
||||
* Returns a transformer for the given primitive type.
|
||||
*
|
||||
* @param aType the primitive type whose transformer to return
|
||||
* @return a transformer that will convert strings into that type,
|
||||
* or null if the given type is not a primitive type
|
||||
* @param aType the primitive type whose transformer to return
|
||||
* @return a transformer that will convert strings into that type,
|
||||
* or null if the given type is not a primitive type
|
||||
*/
|
||||
protected Transformer getTypeTransformer( Class aType ) {
|
||||
return (Transformer) defaultTransformers.get( aType );
|
||||
}
|
||||
|
||||
/**
|
||||
* Logs the given exception to <Code>System.out</Code>. Used to display
|
||||
* warnings while accessing/mutating the bean.
|
||||
* Logs the given exception to <code>System.out</code>. Used to display
|
||||
* warnings while accessing/mutating the bean.
|
||||
*
|
||||
* @param e the exception to log
|
||||
* @param ex the exception to log
|
||||
*/
|
||||
protected void logInfo(Exception e) {
|
||||
// XXXX: should probably use log4j here instead...
|
||||
System.out.println( "INFO: Exception: " + e );
|
||||
protected void logInfo(Exception ex) {
|
||||
// Deliberately do not use LOG4J or Commons Logging to avoid dependencies
|
||||
System.out.println( "INFO: Exception: " + ex );
|
||||
}
|
||||
|
||||
/**
|
||||
* Logs the given exception to <Code>System.err</Code>. Used to display
|
||||
* errors while accessing/mutating the bean.
|
||||
* Logs the given exception to <code>System.err</code>. Used to display
|
||||
* errors while accessing/mutating the bean.
|
||||
*
|
||||
* @param e the exception to log
|
||||
* @param ex the exception to log
|
||||
*/
|
||||
protected void logWarn(Exception e) {
|
||||
// XXXX: should probably use log4j here instead...
|
||||
System.out.println( "WARN: Exception: " + e );
|
||||
e.printStackTrace();
|
||||
protected void logWarn(Exception ex) {
|
||||
// Deliberately do not use LOG4J or Commons Logging to avoid dependencies
|
||||
System.out.println( "WARN: Exception: " + ex );
|
||||
ex.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue