BytesRef.java

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.hadoop.util;

import java.util.ArrayList;
import java.util.List;

/**
 * Wrapper around multiple byte arrays and {@link BytesArray}. Used to pass bytes around by referencing them w/o having to make a copy.
 */
public class BytesRef {

    List<Object> list = null;
    private int size = 0;

    public void add(BytesArrayPool baPool) {
        for (BytesArray pool : baPool.inUse()) {
            add(pool);
        }
    }

    public void add(BytesArray bytes) {
        if (list == null) {
            list = new ArrayList<Object>();
        }
        list.add(bytes);
        size += bytes.length();
    }

    public void add(byte[] bytes) {
        if (list == null) {
            list = new ArrayList<Object>();
        }
        list.add(bytes);
        size += bytes.length;
    }

    public int length() {
        return size;
    }

    public void copyTo(BytesArray to) {
        if (list == null) {
            return;
        }
        for (Object ref : list) {
            if (ref instanceof BytesArray) {
                ((BytesArray) ref).copyTo(to);
            }
            else {
                to.add((byte[]) ref);
            }
        }
    }

    public void reset() {
        if (list != null) {
            list.clear();
        }
        size = 0;
    }

    public String toString() {
        BytesArray ba = new BytesArray(length());
        copyTo(ba);
        return ba.toString();
    }
}