| package org.apache.lucene.util.automaton; |
| |
| /* |
| * 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. |
| */ |
| |
| /** |
| * Automaton representation for matching UTF-8 byte[]. |
| */ |
| public class ByteRunAutomaton extends RunAutomaton { |
| |
| /** Converts incoming automaton to byte-based (UTF32ToUTF8) first */ |
| public ByteRunAutomaton(Automaton a) { |
| this(a, false); |
| } |
| |
| /** expert: if utf8 is true, the input is already byte-based */ |
| public ByteRunAutomaton(Automaton a, boolean utf8) { |
| super(utf8 ? a : new UTF32ToUTF8().convert(a), 256, true); |
| } |
| |
| /** |
| * Returns true if the given byte array is accepted by this automaton |
| */ |
| public boolean run(byte[] s, int offset, int length) { |
| int p = initial; |
| int l = offset + length; |
| for (int i = offset; i < l; i++) { |
| p = step(p, s[i] & 0xFF); |
| if (p == -1) return false; |
| } |
| return accept[p]; |
| } |
| } |