| /* |
| * 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.backward_codecs.lucene40.blocktree; |
| |
| import java.io.IOException; |
| import org.apache.lucene.store.DataInput; |
| import org.apache.lucene.util.compress.LowercaseAsciiCompression; |
| |
| /** Compression algorithm used for suffixes of a block of terms. */ |
| enum CompressionAlgorithm { |
| NO_COMPRESSION(0x00) { |
| |
| @Override |
| void read(DataInput in, byte[] out, int len) throws IOException { |
| in.readBytes(out, 0, len); |
| } |
| }, |
| |
| LOWERCASE_ASCII(0x01) { |
| |
| @Override |
| void read(DataInput in, byte[] out, int len) throws IOException { |
| LowercaseAsciiCompression.decompress(in, out, len); |
| } |
| }, |
| |
| LZ4(0x02) { |
| |
| @Override |
| void read(DataInput in, byte[] out, int len) throws IOException { |
| org.apache.lucene.util.compress.LZ4.decompress(in, len, out, 0); |
| } |
| }; |
| |
| private static final CompressionAlgorithm[] BY_CODE = new CompressionAlgorithm[3]; |
| |
| static { |
| for (CompressionAlgorithm alg : CompressionAlgorithm.values()) { |
| BY_CODE[alg.code] = alg; |
| } |
| } |
| |
| /** Look up a {@link CompressionAlgorithm} by its {@link CompressionAlgorithm#code}. */ |
| static final CompressionAlgorithm byCode(int code) { |
| if (code < 0 || code >= BY_CODE.length) { |
| throw new IllegalArgumentException("Illegal code for a compression algorithm: " + code); |
| } |
| return BY_CODE[code]; |
| } |
| |
| public final int code; |
| |
| private CompressionAlgorithm(int code) { |
| this.code = code; |
| } |
| |
| abstract void read(DataInput in, byte[] out, int len) throws IOException; |
| } |