Add additional constructor
Javadoc and tidy up git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@131191 13f79535-47bb-0310-9956-ffa450edef68
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Stephen Colebourne
parent
491b06c0a6
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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/DefaultMapEntry.java,v 1.11 2003/08/31 17:26:43 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/DefaultMapEntry.java,v 1.12 2003/09/25 22:47:14 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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@ -63,10 +63,12 @@ import java.util.Map;
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* A default implementation of {@link java.util.Map.Entry}
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*
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* @since Commons Collections 1.0
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* @version $Revision: 1.11 $ $Date: 2003/08/31 17:26:43 $
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* @version $Revision: 1.12 $ $Date: 2003/09/25 22:47:14 $
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*
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* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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* @author <a href="mailto:mas@apache.org">Michael A. Smith</a>
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* @author James Strachan
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* @author Michael A. Smith
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* @author Neil O'Toole
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* @author Stephen Colebourne
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*/
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public class DefaultMapEntry implements Map.Entry {
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@ -76,58 +78,43 @@ public class DefaultMapEntry implements Map.Entry {
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private Object value;
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/**
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* Constructs a new <Code>DefaultMapEntry</Code> with a null key
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* Constructs a new <code>DefaultMapEntry</code> with a null key
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* and null value.
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*/
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public DefaultMapEntry() {
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super();
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}
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/**
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* Constructs a new <Code>DefaultMapEntry</Code> with the given
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* Constructs a new <code>DefaultMapEntry</code> with the given
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* key and given value.
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*
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* @param entry the entry to copy, must not be null
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* @throws NullPointerException if the entry is null
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*/
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public DefaultMapEntry(Map.Entry entry) {
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super();
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this.key = entry.getKey();
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this.value = entry.getValue();
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}
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/**
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* Constructs a new <code>DefaultMapEntry</code> with the given
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* key and given value.
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*
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* @param key the key for the entry, may be null
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* @param value the value for the entry, may be null
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*/
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public DefaultMapEntry(Object key, Object value) {
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super();
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this.key = key;
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this.value = value;
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}
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/**
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* Implemented per API documentation of
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* {@link java.util.Map.Entry#equals(Object)}
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*/
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public boolean equals(Object o) {
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if( o == null ) return false;
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if( o == this ) return true;
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if ( ! (o instanceof Map.Entry ) )
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return false;
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Map.Entry e2 = (Map.Entry)o;
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return ((getKey() == null ?
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e2.getKey() == null : getKey().equals(e2.getKey())) &&
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(getValue() == null ?
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e2.getValue() == null : getValue().equals(e2.getValue())));
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}
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/**
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* Implemented per API documentation of
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* {@link java.util.Map.Entry#hashCode()}
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*/
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public int hashCode() {
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return ( ( getKey() == null ? 0 : getKey().hashCode() ) ^
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( getValue() == null ? 0 : getValue().hashCode() ) );
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}
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// Map.Entry interface
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//-------------------------------------------------------------------------
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/**
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* Returns the key.
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* Gets the key from the Map Entry.
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*
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* @return the key
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*/
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@ -136,19 +123,9 @@ public class DefaultMapEntry implements Map.Entry {
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}
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/**
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* Returns the value.
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*
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* @return the value
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*/
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public Object getValue() {
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return value;
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}
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// Properties
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//-------------------------------------------------------------------------
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/**
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* Sets the key. This method does not modify any map.
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* Sets the key stored in this Map Entry.
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* <p>
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* This Map Entry is not connected to a Map, so only the local data is changed.
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*
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* @param key the new key
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*/
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@ -156,12 +133,22 @@ public class DefaultMapEntry implements Map.Entry {
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this.key = key;
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}
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/**
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* Note that this method only sets the local reference inside this object and
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* does not modify the original Map.
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/**
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* Gets the value from the Map Entry.
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*
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* @return the old value of the value
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* @param value the new value
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* @return the value
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*/
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public Object getValue() {
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return value;
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}
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/**
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* Sets the value stored in this Map Entry.
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* <p>
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* This Map Entry is not connected to a Map, so only the local data is changed.
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*
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* @param value the new value
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* @return the previous value
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*/
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public Object setValue(Object value) {
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Object answer = this.value;
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@ -169,4 +156,39 @@ public class DefaultMapEntry implements Map.Entry {
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return answer;
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}
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// Basics
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//-----------------------------------------------------------------------
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/**
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* Compares this Map Entry with another Map Entry.
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* <p>
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* Implemented per API documentation of {@link java.util.Map.Entry#equals(Object)}
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*
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* @param obj the object to compare to
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* @return true if equal key and value
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*/
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public final boolean equals(Object obj) {
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if (obj == this) {
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return true;
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}
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if (obj instanceof Map.Entry == false) {
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return false;
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}
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Map.Entry other = (Map.Entry) obj;
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return
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(getKey() == null ? other.getKey() == null : getKey().equals(other.getKey())) &&
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(getValue() == null ? other.getValue() == null : getValue().equals(other.getValue()));
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}
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/**
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* Gets a hashCode compatible with the equals method.
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* <p>
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* Implemented per API documentation of {@link java.util.Map.Entry#hashCode()}
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*
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* @return a suitable hashcode
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*/
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public final int hashCode() {
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return (getKey() == null ? 0 : getKey().hashCode()) ^
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(getValue() == null ? 0 : getValue().hashCode());
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}
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}
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