/**
* 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.apache.activemq.kaha.impl.index;
import java.io.IOException;
import java.io.RandomAccessFile;
import org.apache.activemq.util.DataByteArrayInputStream;
/**
* Optimized Store reader
*
* @version $Revision: 1.1.1.1 $
*/
class StoreIndexReader {
protected RandomAccessFile file;
protected DataByteArrayInputStream dataIn;
protected byte[] buffer = new byte[IndexItem.INDEX_SIZE];
/**
* Construct a Store reader
*
* @param file
*/
StoreIndexReader(RandomAccessFile file) {
this.file = file;
this.dataIn = new DataByteArrayInputStream();
}
protected IndexItem readItem(long offset) throws IOException {
file.seek(offset);
file.readFully(buffer);
dataIn.restart(buffer);
IndexItem result = new IndexItem();
result.setOffset(offset);
result.read(dataIn);
return result;
}
void updateIndexes(IndexItem indexItem) throws IOException {
if (indexItem != null) {
file.seek(indexItem.getOffset());
file.readFully(buffer, 0, IndexItem.INDEXES_ONLY_SIZE);
dataIn.restart(buffer);
indexItem.readIndexes(dataIn);
}
}
}