package org.apache.lucene.store;
/**
* Copyright 2004 The Apache Software Foundation
*
* 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.
*/
/**
* A memory-resident {@link IndexInput} implementation.
*
* @version $Id: RAMInputStream.java 150537 2004-09-28 20:45:26Z cutting $
*/
class RAMInputStream extends BufferedIndexInput implements Cloneable {
private RAMFile file;
private int pointer = 0;
private long length;
public RAMInputStream(RAMFile f) {
file = f;
length = file.length;
}
public void readInternal(byte[] dest, int destOffset, int len) {
int remainder = len;
int start = pointer;
while (remainder != 0) {
int bufferNumber = start/BUFFER_SIZE;
int bufferOffset = start%BUFFER_SIZE;
int bytesInBuffer = BUFFER_SIZE - bufferOffset;
int bytesToCopy = bytesInBuffer >= remainder ? remainder : bytesInBuffer;
byte[] buffer = (byte[])file.buffers.elementAt(bufferNumber);
System.arraycopy(buffer, bufferOffset, dest, destOffset, bytesToCopy);
destOffset += bytesToCopy;
start += bytesToCopy;
remainder -= bytesToCopy;
}
pointer += len;
}
public void close() {
}
public void seekInternal(long pos) {
pointer = (int)pos;
}
public long length() {
return length;
}
}
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