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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.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import net.sf.ezmorph.MorphException;
import net.sf.ezmorph.MorpherRegistry;
import net.sf.ezmorph.ObjectMorpher;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* An all-purpose Morpher that can morph to several classes.<br>
* Because this Morpher accepts any class and morphs to Object it should not be
* added to a MorpherRegistry as it may be too generic for some cases and may
* result in unwanted transformations.
*
* @author Andres Almiray <aalmiray@users.sourceforge.net>
*/
public class SwitchingMorpher implements ObjectMorpher
{
private Map classMap = new HashMap();
private MorpherRegistry morpherRegistry;
public SwitchingMorpher( Map classMap, MorpherRegistry morpherRegistry )
{
this.morpherRegistry = morpherRegistry;
if( classMap == null || classMap.isEmpty() ){
throw new MorphException( "Must specify at least one mapping" );
}
this.classMap.putAll( classMap );
}
public boolean equals( Object obj )
{
if( this == obj ){
return true;
}
if( obj == null ){
return false;
}
if( !(obj instanceof NumberMorpher) ){
return false;
}
SwitchingMorpher other = (SwitchingMorpher) obj;
if( classMap.size() != other.classMap.size() ){
return false;
}
for( Iterator entries = classMap.entrySet()
.iterator(); entries.hasNext(); ){
Map.Entry entry = (Map.Entry) entries.next();
if( !other.classMap.containsKey( entry.getKey() ) ){
return false;
}
if( !entry.getValue()
.equals( other.classMap.get( entry.getKey() ) ) ){
return false;
}
}
return true;
}
public int hashCode()
{
HashCodeBuilder builder = new HashCodeBuilder();
for( Iterator entries = classMap.entrySet()
.iterator(); entries.hasNext(); ){
Map.Entry entry = (Map.Entry) entries.next();
builder.append( entry.getKey() );
builder.append( entry.getValue() );
}
return builder.toHashCode();
}
public Object morph( Object value )
{
if( value == null ){
return null;
}
Class target = (Class) classMap.get( value.getClass() );
return morpherRegistry.morph( target, value );
}
public Class morphsTo()
{
return Object.class;
}
public boolean supports( Class clazz )
{
return true;
}
}
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