/***********************************************************************************************************************
*
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.pact.runtime.util;
import java.util.Iterator;
import eu.stratosphere.api.common.typeutils.TypeSerializer;
import eu.stratosphere.util.MutableObjectIterator;
public class RegularToMutableObjectIterator<T> implements MutableObjectIterator<T> {
private final Iterator<T> iterator;
private final TypeSerializer<T> serializer;
public RegularToMutableObjectIterator(Iterator<T> iterator, TypeSerializer<T> serializer) {
this.iterator = iterator;
this.serializer = serializer;
}
@Override
public T next(T reuse) {
// -----------------------------------------------------------------------------------------
// IMPORTANT: WE NEED TO COPY INTO THE REUSE OBJECT TO SIMULATE THE MUTABLE OBJECT RUNTIME
// -----------------------------------------------------------------------------------------
if (this.iterator.hasNext()) {
return this.serializer.copy(this.iterator.next(), reuse);
} else {
return null;
}
}
}