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/*
* Copyright 2006-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ezmorph.object;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import net.sf.ezmorph.MorphException;
import net.sf.ezmorph.Morpher;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* Morphs a List to another List using a Morpher.
*
* @author Andres Almiray <aalmiray@users.sourceforge.net>
*/
public final class ObjectListMorpher extends AbstractObjectMorpher
{
private Object defaultValue;
private Morpher morpher;
private Method morphMethod;
/**
* Creates a new ArrayMorpher which will use another Morpher for its inner
* type.<br>
* The inner morpher can not morph to an array. Multiple dimension arrays are
* already handled by this class.
*
* @param morpher the Morpher that will handle the array's inner type.
*/
public ObjectListMorpher( Morpher morpher )
{
setMorpher( morpher );
}
public ObjectListMorpher( Morpher morpher, Object defaultValue )
{
super(true);
this.defaultValue = defaultValue;
setMorpher( morpher );
}
public boolean equals( Object obj )
{
if( this == obj ){
return true;
}
if( obj == null ){
return false;
}
if( !(obj instanceof ObjectListMorpher) ){
return false;
}
ObjectListMorpher other = (ObjectListMorpher) obj;
return morpher.equals( other.morpher );
}
public int hashCode()
{
return new HashCodeBuilder().append( morpher )
.toHashCode();
}
public Object morph( Object value )
{
if( value == null ){
return null;
}
if( !supports( value.getClass() ) ){
throw new MorphException( value.getClass() + " is not supported" );
}
List list = new ArrayList();
for( Iterator i = ((List) value).iterator(); i.hasNext(); ){
Object object = i.next();
if( object == null ){
if( isUseDefault() ){
list.add( defaultValue );
}else{
list.add( object );
}
}else{
if( !morpher.supports( object.getClass() ) ){
throw new MorphException( object.getClass() + " is not supported" );
}
try{
list.add( morphMethod.invoke( morpher, new Object[] { object } ) );
}
catch( MorphException me ){
throw me;
}
catch( Exception e ){
throw new MorphException( e );
}
}
}
return list;
}
public Class morphsTo()
{
return List.class;
}
public boolean supports( Class clazz )
{
return clazz != null && List.class.isAssignableFrom( clazz );
}
private void setMorpher( Morpher morpher )
{
if( morpher == null ){
throw new IllegalArgumentException( "morpher can not be null" );
}
this.morpher = morpher;
// cache the morph method
try{
morphMethod = morpher.getClass()
.getDeclaredMethod( "morph", new Class[] { Object.class } );
}
catch( NoSuchMethodException nsme ){
throw new IllegalArgumentException( nsme.getMessage() );
}
}
}
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