/*
*
* * 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.object.db;
import java.io.Serializable;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import javassist.util.proxy.ProxyObject;
import com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler;
/**
* Lazy implementation of Iterator that load the records only when accessed. It keep also track of changes to the source record
* avoiding to call setDirty() by hand.
*
* @author Luca Garulli (l.garulli--at--orientechnologies.com)
*
*/
@SuppressWarnings({ "unchecked" })
public class OObjectLazyListIterator<TYPE> implements Iterator<TYPE>, Serializable {
private static final long serialVersionUID = 3714399452499077452L;
private final ProxyObject sourceRecord;
private final OObjectLazyList<TYPE> list;
private String fetchPlan;
private int cursor = 0;
private int lastRet = -1;
public OObjectLazyListIterator(final OObjectLazyList<TYPE> iSourceList, final ProxyObject iSourceRecord) {
this.list = iSourceList;
this.sourceRecord = iSourceRecord;
}
public TYPE next() {
return next(fetchPlan);
}
public TYPE next(final String iFetchPlan) {
final Object value = list.get(cursor);
lastRet = cursor++;
return (TYPE) value;
}
public boolean hasNext() {
return cursor < (list.size());
}
public void remove() {
if (lastRet == -1)
throw new IllegalStateException();
try {
list.remove(lastRet);
if (lastRet < cursor)
cursor--;
lastRet = -1;
} catch (IndexOutOfBoundsException e) {
throw new ConcurrentModificationException(e);
}
if (sourceRecord != null) {
((OObjectProxyMethodHandler) sourceRecord.getHandler()).setDirty();
}
}
public String getFetchPlan() {
return fetchPlan;
}
public void setFetchPlan(String fetchPlan) {
this.fetchPlan = fetchPlan;
}
}