/*
*
* * Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
* *
* * 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.
* *
* * For more information: http://www.orientechnologies.com
*
*/
package com.orientechnologies.orient.core.index;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import java.util.Iterator;
import java.util.Map;
/**
* Implementation of index cursor in case of collection of values which belongs to single key should be returned.
*
* @author Andrey Lomakin <a href="mailto:lomakin.andrey@gmail.com">Andrey Lomakin</a>
* @since 4/4/14
*/
public class OIndexCursorCollectionValue extends OIndexAbstractCursor {
private final Object key;
private Iterator<OIdentifiable> iterator;
public OIndexCursorCollectionValue(Iterator<OIdentifiable> iterator, Object key) {
this.iterator = iterator;
this.key = key;
}
@Override
public boolean hasNext() {
if (iterator == null)
return false;
if (!iterator.hasNext()) {
iterator = null;
return false;
}
return true;
}
@Override
public OIdentifiable next() {
return iterator.next();
}
@Override
public Map.Entry<Object, OIdentifiable> nextEntry() {
if (iterator == null)
return null;
if (!iterator.hasNext()) {
iterator = null;
return null;
}
final OIdentifiable value = iterator.next();
return new Map.Entry<Object, OIdentifiable>() {
@Override
public Object getKey() {
return key;
}
@Override
public OIdentifiable getValue() {
return value;
}
@Override
public OIdentifiable setValue(OIdentifiable value) {
throw new UnsupportedOperationException("setValue");
}
};
}
}