/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Sam
*/
package com.caucho.quercus.lib.spl;
import com.caucho.quercus.QuercusException;
import com.caucho.quercus.env.ConstStringValue;
import com.caucho.quercus.env.TraversableDelegate;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.ObjectValue;
import com.caucho.quercus.env.StringBuilderValue;
import com.caucho.quercus.env.Value;
import com.caucho.util.L10N;
import java.util.Iterator;
import java.util.Map;
/**
* A delegate that intercepts requests for iterator's and delegates
* them to the iterator returned by {@link IteratorAggregate@getIterator()}
*/
public class IteratorAggregateDelegate
implements TraversableDelegate
{
private static final L10N L = new L10N(IteratorAggregateDelegate.class);
private static final StringBuilderValue GET_ITERATOR
= new ConstStringValue("getIterator");
private static final IteratorDelegate _iteratorDelegate
= new IteratorDelegate();
public Iterator<Map.Entry<Value, Value>>
getIterator(Env env, ObjectValue qThis)
{
Value target = getTarget(env, qThis);
if (target instanceof ObjectValue) {
return target.getIterator(env);
}
else
throw new QuercusException(L.l("'{0}' is not a valid Traversable",
qThis));
}
public Iterator<Value> getKeyIterator(Env env, ObjectValue qThis)
{
Value target = getTarget(env, qThis);
if (target instanceof ObjectValue)
return _iteratorDelegate.getKeyIterator(env, (ObjectValue) target);
else
throw new QuercusException(L.l("'{0}' is not a valid Traversable",
qThis));
}
public Iterator<Value> getValueIterator(Env env, ObjectValue qThis)
{
Value target = getTarget(env, qThis);
if (target instanceof ObjectValue){
if(target.isA("iteratoraggregate"))
{
return target.getValueIterator(env);
}
else
{
return _iteratorDelegate.getValueIterator(env, (ObjectValue) target);
}
}
else
throw new QuercusException(L.l("'{0}' is not a valid Traversable",
qThis));
}
private Value getTarget(Env env, ObjectValue qThis)
{
return qThis.callMethod(env, GET_ITERATOR);
}
}