package org.apache.lucene.index; /** * 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. */ /** * 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 { 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. */ public void init(int address) { slice = pool.buffers[address >> DocumentsWriter.BYTE_BLOCK_SHIFT]; assert slice != null; upto = address & DocumentsWriter.BYTE_BLOCK_MASK; offset0 = address; assert upto < slice.length; } /** Write byte into byte slice stream */ 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; } 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 & DocumentsWriter.BYTE_BLOCK_NOT_MASK); } public void writeVInt(int i) { while ((i & ~0x7F) != 0) { writeByte((byte)((i & 0x7f) | 0x80)); i >>>= 7; } writeByte((byte) i); } }