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A PHP engine implemented in 100% Java
/*
* Copyright (c) 1998-2012 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.env.Env;
import com.caucho.quercus.env.ObjectValue;
import com.caucho.quercus.env.TraversableDelegate;
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 calls methods on
* target objects that implement
* the {@link com.caucho.quercus.lib.spl.Iterator} interface.
*/
public class IteratorDelegate implements TraversableDelegate
{
private static final L10N L = new L10N(IteratorDelegate.class);
public Iterator>
getIterator(Env env, ObjectValue qThis)
{
return new EntryIterator(env, qThis);
}
public Iterator getKeyIterator(Env env, ObjectValue qThis)
{
// doesn't belong here
// php/4ar3
//env.error(L.l("An iterator cannot be used with foreach by reference"));
return new KeyIterator(env, qThis);
}
public Iterator getValueIterator(Env env, ObjectValue qThis)
{
return new ValueIterator(env, (ObjectValue) qThis);
}
public static class EntryIterator
extends AbstractIteratorImpl>
{
public EntryIterator(Env env, ObjectValue obj)
{
super(env, obj);
}
@Override
protected Map.Entry getCurrent()
{
// php/4ar2
Value value = getCurrentValue();
Value key = getCurrentKey();
return new EntryImpl(key, value);
}
}
public static class EntryImpl
implements Map.Entry
{
private final Value _key;
private final Value _value;
public EntryImpl(Value key, Value value)
{
_key = key;
_value = value;
}
public Value getKey()
{
return _key;
}
public Value getValue()
{
return _value;
}
public Value setValue(Value value)
{
throw new UnsupportedOperationException();
}
}
public static class KeyIterator
extends AbstractIteratorImpl
{
public KeyIterator(Env env, ObjectValue obj)
{
super(env, obj);
}
@Override
protected Value getCurrent()
{
return getCurrentKey();
}
}
public static class ValueIterator
extends AbstractIteratorImpl
{
public ValueIterator(Env env, ObjectValue obj)
{
super(env, obj);
}
@Override
protected Value getCurrent()
{
return getCurrentValue();
}
}
}