Returns the index within this buffer of the first occurrence of the specified pattern buffer. - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

Returns the index within this buffer of the first occurrence of the specified pattern buffer.

Demo Code

/*//from ww w .j a v a2s  .  c o  m
 * Copyright 2004-2005 the original author or authors.
 *
 * Licensed 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 com.java2s;
import java.nio.ByteBuffer;

public class Main {
    /**
     * Returns the index within this buffer of the first occurrence of the
     * specified pattern buffer.
     * 
     * @param buffer
     *       the buffer
     * @param pattern
     *       the pattern buffer
     * @return
     *       the position within the buffer of the first occurrence of the 
     * pattern buffer
     */
    public static int indexOf(ByteBuffer buffer, ByteBuffer pattern) {
        int patternPos = pattern.position();
        int patternLen = pattern.remaining();
        int lastIndex = buffer.limit() - patternLen + 1;

        Label: for (int i = buffer.position(); i < lastIndex; i++) {
            for (int j = 0; j < patternLen; j++) {
                if (buffer.get(i + j) != pattern.get(patternPos + j))
                    continue Label;
            }
            return i;
        }
        return -1;
    }
}

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