/*
* 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.util.automaton;
/**
* 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, Operations.DEFAULT_MAX_DETERMINIZED_STATES);
}
/** expert: if isBinary is true, the input is already byte-based */
public ByteRunAutomaton(Automaton a, boolean isBinary, int maxDeterminizedStates) {
super(isBinary ? a : new UTF32ToUTF8().convert(a), 256, maxDeterminizedStates);
}
/**
* Returns true if the given byte array is accepted by this automaton
*/
public boolean run(byte[] s, int offset, int length) {
int p = 0;
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];
}
}