org.apache.fluo.core.util.ByteUtil.java Source code

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Here is the source code for org.apache.fluo.core.util.ByteUtil.java

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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.fluo.core.util;

import org.apache.accumulo.core.data.ArrayByteSequence;
import org.apache.accumulo.core.data.ByteSequence;
import org.apache.fluo.api.data.Bytes;
import org.apache.hadoop.io.Text;

/**
 * Utilities for modifying byte arrays and converting Bytes objects to external formats
 */
public class ByteUtil {

    public static final byte[] EMPTY = new byte[0];

    private ByteUtil() {
    }

    /**
     * Convert from Bytes to Hadoop Text object
     */
    public static Text toText(Bytes b) {
        return new Text(b.toArray());
    }

    /**
     * Convert from Hadoop Text to Bytes
     */
    public static Bytes toBytes(Text t) {
        return Bytes.of(t.getBytes(), 0, t.getLength());
    }

    /**
     * Converts from ByteSequence to Bytes. If the ByteSequence has a backing array, that array (and
     * the buffer's offset and limit) are used. Otherwise, a new backing array is created.
     *
     * @param bs ByteSequence
     * @return Bytes object
     */
    public static Bytes toBytes(ByteSequence bs) {
        if (bs.isBackedByArray()) {
            return Bytes.of(bs.getBackingArray(), bs.offset(), bs.length());
        } else {
            return Bytes.of(bs.toArray(), 0, bs.length());
        }
    }

    /**
     * Convert from Bytes to ByteSequence
     */
    public static ByteSequence toByteSequence(Bytes b) {
        return new ArrayByteSequence(b.toArray());
    }

    public static byte[] toByteArray(Text text) {
        byte[] bytes = text.getBytes();
        if (bytes.length != text.getLength()) {
            bytes = new byte[text.getLength()];
            System.arraycopy(text.getBytes(), 0, bytes, 0, bytes.length);
        }
        return bytes;
    }
}