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Initial commit of a system of retrieving Torque-persisted objects from Document objects. 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@150760 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Kelvin Tan 2002-05-08 15:53:48 +00:00
parent 57ad807bd9
commit 01bb49e1a4
6 changed files with 742 additions and 0 deletions
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94
sandbox/projects/appex/src/java/search/Broker.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import org.apache.torque.pool.DBConnection;
import org.apache.torque.util.Criteria;
import java.util.List;
/**
* An interface to shield clients from knowledge of the underlying persistence
* implementation.
*
* @author <a href="mailto:kelvin@relevanz.com">Kelvin Tan</a>
*/
public interface Broker
{
/**
* Returns a list of objects given the Criteria.
*/
List doSelect(Criteria crit) throws Exception;
/**
* Returns a list of objects given the Criteria.
*/
List doSelect(Criteria crit, DBConnection dbCon) throws Exception;
/**
* Convenience method to obtain a single object via this broker.
*/
Object getSingleObject(Criteria crit) throws ObjectNotFoundException, Exception;
/**
* Returns an object using it's primary keys.
*/
Object retrieveByPK(String[] pk) throws Exception;
/**
* Returns an object using it's primary key.
*/
Object retrieveByPK(String pk) throws Exception;
}

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sandbox/projects/appex/src/java/search/BrokerFactory.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
/**
* Factory class to obtain broker objects.
*
* @author <a href="mailto:kelvin@relevanz.com">Kelvin Tan</a>
*/
public abstract class BrokerFactory
{
public static Broker getBroker(Class bObj)
{
return new TorqueBroker(bObj);
}
}

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sandbox/projects/appex/src/java/search/NoSuchBrokerException.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
/**
* Thrown when a broker cannot be instantiated.
*
* @author <a href="mailto:kelvin@relevanz.com">Kelvin Tan</a>
*/
public class NoSuchBrokerException extends RuntimeException
{
/** Creates new GroupNotFoundException */
public NoSuchBrokerException(String message)
{
super(message);
}
}

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sandbox/projects/appex/src/java/search/ObjectNotFoundException.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import org.apache.torque.util.Criteria;
/**
* Thrown when a Torque-persisted object can't be found when it is expected.
*
* @author <a href="mailto:soonping@relevanz.com">Phang Soon-Ping</a>
*/
public class ObjectNotFoundException extends Exception
{
public ObjectNotFoundException(Class objectClass, String objectId)
{
super(generateMessage(objectClass, objectId));
}
public ObjectNotFoundException(Criteria crit)
{
super("Criteria :'" + crit.toString() + "' did not result in any object "
+ " when one was expected.");
}
private static String generateMessage(Class c, String id)
{
String cName = c.getName();
int lastDot = cName.lastIndexOf('.');
if (lastDot < 0)
{
return cName + " with id " + id + " not found.";
}
else
{
return cName.substring(lastDot + 1) + " with ID \"" + id + "\" not found.";
}
}
}

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sandbox/projects/appex/src/java/search/SearchResultFactory.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import org.apache.log4j.Category;
import org.apache.lucene.document.Document;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Factory class to materialize the objects which
* are search results.
*/
public abstract class SearchResultFactory
{
/**
* Name of method for objects which don't have a broker, but which need to
* be initialized somehow.
*/
public static final String INIT_OBJECT_METHOD = "initializeObject";
/**
* Arguments for INIT_OBJECT_METHOD.
*/
public static final Class[] INIT_OBJECT_METHOD_ARGS = new Class[]{String.class};
public static final Class[] SEARCH_RESULT_WRAPPER_CTOR_ARGS
= new Class[]{Object.class};
private static Category cat = Category.getInstance(SearchResultFactory.class);
/**
* <p>
* Materializes the object represented by the
* {@link org.apache.lucene.document.Document}.
* </p>
* <p>
* Objects which need to be returned via this method (essentially
* any object which implements
* {@link com.marketingbright.core.services.search.SearchResult},
* must either have an associated broker, or a no-arg ctor and
* INIT_OBJECT_METHOD with INIT_OBJECT_METHOD_ARGS.
* </p>
*/
public static Object getDocAsObject(Document doc) throws Exception
{
Class clazz = Class.forName(doc.get(DataSource.OBJECT_CLASS));
String id = doc.get(DataSource.OBJECT_IDENTIFIER);
Object o = null;
try
{
Broker broker = BrokerFactory.getBroker(clazz);
// assume it's a two-part compound pk if there's a comma
int indexOfComma = id.indexOf(',');
if (indexOfComma != -1)
{
String[] pks = new String[2];
pks[0] = id.substring(0, indexOfComma);
pks[1] = id.substring(indexOfComma + 1);
o = broker.retrieveByPK(pks);
}
else
{
o = broker.retrieveByPK(id);
}
}
catch (NoSuchBrokerException nsbe)
{
/**
* Some objects don't have brokers or peers, this offers an
* alternative.
*/
o = clazz.newInstance();
invokeMethod(o, INIT_OBJECT_METHOD,
INIT_OBJECT_METHOD_ARGS, new Object[]{id});
}
String searchResultClassname = null;
searchResultClassname = doc.get(DataSource.SEARCH_RESULT_CLASSNAME);
return generateObject(searchResultClassname,
SEARCH_RESULT_WRAPPER_CTOR_ARGS,
new Object[]{o});
}
/**
* Utility method to invoke an object's method.
* @param o Object to invoke the method on.
* @param methodname Name of the method to invoke.
* @param parameter Method parameters.
* @param args Arguments the method requires.
* @return Object returned by the method.
*/
private static Object invokeMethod(Object o, String methodname,
Class[] parameter, Object[] args)
{
Class c = o.getClass();
try
{
Method m = c.getMethod(methodname, parameter);
return m.invoke(o, args);
}
catch (NoSuchMethodException nsme)
{
cat.error(nsme.getMessage() + " This method doesn't exist..", nsme);
}
catch (IllegalAccessException iae)
{
cat.error("No access to " + iae.getMessage() + ".", iae);
}
catch (InvocationTargetException ite)
{
cat.error("Trouble invoking " + ite.getMessage(), ite);
}
return null;
}
/**
* Utility method to return an object based on its class name.
*
* @param type Class name of object to be generated
* @param clazz Class array of parameters.
* @param args Object array of arguments.
* @return Object
*/
public static Object generateObject(String className,
Class[] clazz,
Object[] args)
{
Object o = null;
try
{
Class c = Class.forName(className);
Constructor con = c.getConstructor(clazz);
if (con != null)
{
o = con.newInstance(args);
}
else
throw new InstantiationException("Constructor with arguments:" + clazz.toString() + " non-existent.");
}
catch (ClassNotFoundException cnfe)
{
cat.error(cnfe.getMessage() + " No class named '" + className + "' was found.", cnfe);
}
catch (InstantiationException ie)
{
cat.error(ie.getMessage() + " Class named '" + className + "' could not be instantiated.", ie);
}
catch (IllegalAccessException iae)
{
cat.error(iae.getMessage() + " No access to class named '" + className + "'.", iae);
}
catch (NoSuchMethodException nsme)
{
cat.error(nsme.getMessage() + " No method in class named '" + className + "'.", nsme);
}
catch (InvocationTargetException ite)
{
cat.error(ite.getMessage() + " in class named '" + className + "'.", ite);
}
return o;
}
}

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sandbox/projects/appex/src/java/search/TorqueBroker.java Normal file
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package search;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Lucene" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Lucene", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import org.apache.log4j.Category;
import org.apache.torque.om.ComboKey;
import org.apache.torque.om.ObjectKey;
import org.apache.torque.om.StringKey;
import org.apache.torque.pool.DBConnection;
import org.apache.torque.util.Criteria;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
/**
* Torque implementation of the Broker interface.
*
* @author <a href="mailto:soonping@relevanz.com">Phang Soon-Ping</a>
*/
public class TorqueBroker implements Broker
{
protected static Map classMap = new Hashtable();
private static Category cat = Category.getInstance(TorqueBroker.class);
private static final String PEER_SUFFIX = "Peer";
protected Object peer;
public TorqueBroker(Class bObj) throws NoSuchBrokerException
{
String className = bObj.getName();
peer = classMap.get(bObj);
if (peer == null)
{
String peerClassName = className + PEER_SUFFIX;
try
{
peer = Class.forName(peerClassName).newInstance();
classMap.put(bObj, peer);
}
catch (Exception e)
{
throw new NoSuchBrokerException("Unable to obtain a broker for "
+ bObj.getName() + '.');
}
}
}
public synchronized List doSelect(Criteria crit) throws Exception
{
return (List) invokeMethod(
peer,
"doSelect",
new Class[]{Criteria.class},
new Object[]{crit}
);
}
public synchronized List doSelect(Criteria crit, DBConnection dbCon)
throws Exception
{
return (List) invokeMethod(
peer,
"doSelect",
new Class[]{Criteria.class, DBConnection.class},
new Object[]{crit, dbCon}
);
}
public synchronized Object getSingleObject(Criteria crit)
throws ObjectNotFoundException, Exception
{
List matchingObjects = doSelect(crit);
if (!matchingObjects.isEmpty())
{
return matchingObjects.get(0);
}
else
{
throw new ObjectNotFoundException(crit);
}
}
public synchronized Object retrieveByPK(String[] pk) throws Exception
{
ObjectKey oKey = null;
if (pk.length > 1)
{
StringKey[] strKeys = new StringKey[pk.length];
for (int i = 0; i < pk.length; i++)
{
strKeys[i] = new StringKey(pk[i]);
}
oKey = new ComboKey(strKeys);
}
else
{
oKey = new StringKey(pk[0]);
}
return invokeMethod(
peer,
"retrieveByPK",
new Class[]{ObjectKey.class},
new Object[]{oKey});
}
public synchronized Object retrieveByPK(String pk) throws Exception
{
ObjectKey oKey = new StringKey(pk);
return invokeMethod(
peer,
"retrieveByPK",
new Class[]{ObjectKey.class},
new Object[]{oKey});
}
/**
* Utility method to invoke an object's method.
* @param o Object to invoke the method on.
* @param methodname Name of the method to invoke.
* @param parameter Method parameters.
* @param args Arguments the method requires.
* @return Object returned by the method.
*/
private static Object invokeMethod(Object o, String methodname,
Class[] parameter, Object[] args)
{
Class c = o.getClass();
try
{
Method m = c.getMethod(methodname, parameter);
return m.invoke(o, args);
}
catch (NoSuchMethodException nsme)
{
cat.error(nsme.getMessage() + " This method doesn't exist..", nsme);
}
catch (IllegalAccessException iae)
{
cat.error("No access to " + iae.getMessage() + ".", iae);
}
catch (InvocationTargetException ite)
{
cat.error("Trouble invoking " + ite.getMessage(), ite);
}
return null;
}
}