/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.exoplatform.services.jcr.impl.core.query.lucene;
import org.apache.lucene.index.FilterIndexReader;
import org.apache.lucene.index.IndexReader;
import java.io.IOException;
/**
* <code>RefCountingIndexReader</code>...
*/
public class RefCountingIndexReader
extends FilterIndexReader
implements ReleaseableIndexReader {
/**
* A reference counter. When constructed the refCount is one.
*/
private int refCount = 1;
public RefCountingIndexReader(IndexReader in) {
super(in);
}
/**
* Increments the reference count on this index reader. The reference count
* is decremented on {@link #release()}.
*/
synchronized final void acquire() {
refCount++;
}
/**
* @return the current reference count value.
*/
public synchronized int getRefCounter() {
return refCount;
}
//-----------------------< ReleaseableIndexReader >--------------------------
/**
* {@inheritDoc}
*/
public synchronized final void release() throws IOException {
if (--refCount == 0) {
close();
}
}
//-----------------------< FilterIndexReader >--------------------------
@Override
protected void doClose() throws IOException {
Util.closeOrRelease(in);
}
}