/*
 * 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.lucene.index;

import org.apache.lucene.store.DataOutput;
import org.apache.lucene.util.ByteBlockPool;



Class to write byte streams into slices of shared byte[]. This is used by DocumentsWriter to hold the posting list for many terms in RAM.
/** * Class to write byte streams into slices of shared * byte[]. This is used by DocumentsWriter to hold the * posting list for many terms in RAM. */
final class ByteSliceWriter extends DataOutput { private byte[] slice; private int upto; private final ByteBlockPool pool; int offset0; public ByteSliceWriter(ByteBlockPool pool) { this.pool = pool; }
Set up the writer to write at address.
/** * Set up the writer to write at address. */
public void init(int address) { slice = pool.buffers[address >> ByteBlockPool.BYTE_BLOCK_SHIFT]; assert slice != null; upto = address & ByteBlockPool.BYTE_BLOCK_MASK; offset0 = address; assert upto < slice.length; }
Write byte into byte slice stream
/** Write byte into byte slice stream */
@Override public void writeByte(byte b) { assert slice != null; if (slice[upto] != 0) { upto = pool.allocSlice(slice, upto); slice = pool.buffer; offset0 = pool.byteOffset; assert slice != null; } slice[upto++] = b; assert upto != slice.length; } @Override public void writeBytes(final byte[] b, int offset, final int len) { final int offsetEnd = offset + len; while(offset < offsetEnd) { if (slice[upto] != 0) { // End marker upto = pool.allocSlice(slice, upto); slice = pool.buffer; offset0 = pool.byteOffset; } slice[upto++] = b[offset++]; assert upto != slice.length; } } public int getAddress() { return upto + (offset0 & DocumentsWriterPerThread.BYTE_BLOCK_NOT_MASK); } }