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 408916 2006-05-23 15:01:11Z yonik $ */class RAMInputStream extends BufferedIndexInput implements Cloneable {  private RAMFile file;  private long 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;    long start = pointer;    while (remainder != 0) {      int bufferNumber = (int)(start/BUFFER_SIZE);      int bufferOffset = (int)(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 = pos;  }  public long length() {    return length;  }}