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/*
* 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.commons.text.matcher;
/**
* Determines if a character array portion matches.
*
* @since 1.3
*/
public interface StringMatcher {
/**
* Returns the number of matching characters, zero for no match.
*
* This method is called to check for a match. The parameter pos represents the current position to be
* checked in the string buffer (a character array which must not be changed). The API guarantees that
* pos is a valid index for buffer.
*
* The character array may be larger than the active area to be matched. Only values in the buffer between the
* specified indices may be accessed.
*
* The matching code may check one character or many. It may check characters preceding pos as well as
* those after, so long as no checks exceed the bounds specified.
*
* It must return zero for no match, or a positive number if a match was found. The number indicates the number of
* characters that matched.
*
* @param buffer
* the text content to match against, do not change
* @param pos
* the starting position for the match, valid for buffer
* @param bufferStart
* the first active index in the buffer, valid for buffer
* @param bufferEnd
* the end index (exclusive) of the active buffer, valid for buffer
* @return the number of matching characters, or zero if there is no match
*/
int isMatch(char[] buffer, int pos, int bufferStart, int bufferEnd);
}