com.facebook.hive.orc.DynamicByteArray.java Source code

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Here is the source code for com.facebook.hive.orc.DynamicByteArray.java

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//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.

/**
 * 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 com.facebook.hive.orc;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;

import org.apache.hadoop.hive.ql.io.slice.SizeOf;
import org.apache.hadoop.hive.ql.io.slice.Slice;
import org.apache.hadoop.hive.ql.io.slice.Slices;
import org.apache.hadoop.io.Text;

/**
 * A class that is a growable array of bytes. Growth is managed in terms of
 * chunks that are allocated when needed.
 */
public final class DynamicByteArray extends DynamicArray {
    static final int DEFAULT_SIZE = 32 * 1024;

    public DynamicByteArray(MemoryEstimate memoryEstimate) {
        this(DEFAULT_SIZE, memoryEstimate);
    }

    public DynamicByteArray(int size, MemoryEstimate memoryEstimate) {
        super(size, memoryEstimate, SizeOf.SIZE_OF_BYTE, DEFAULT_SIZE);
    }

    public byte get(int index) {
        if (index >= length) {
            throw new IndexOutOfBoundsException("Index " + index + " is outside of 0.." + (length - 1));
        }
        return data.getByte(index);
    }

    public void set(int index, byte value) {
        grow(index);
        if (index >= length) {
            length = index + 1;
        }
        data.setByte(index, value);
    }

    public int add(byte value) {
        grow(length);
        data.setByte(length, value);
        int result = length;
        length += 1;
        return result;
    }

    /**
     * Copy a slice of a byte array into our buffer.
     * @param value the array to copy from
     * @param valueOffset the first location to copy from value
     * @param valueLength the number of bytes to copy from value
     * @return the offset of the start of the value
     */
    public int add(byte[] value, int valueOffset, int valueLength) {
        grow(length + valueLength);
        data.setBytes(length, value, valueOffset, valueLength);
        int result = length;
        length += valueLength;
        return result;
    }

    /**
     * Read the entire stream into this array.
     * @param in the stream to read from
     * @throws IOException
     */
    public void readAll(InputStream in) throws IOException {
        int read = 0;
        do {
            grow(length);
            read = data.setBytes(length, in, data.length() - length);
            if (read > 0) {
                length += read;
            }
        } while (in.available() > 0);
    }

    /**
     * Read lengthToRead bytes from the input stream into this array
     * @param in the stream to read from
     * @param lengthToRead the number of bytes to read
     * @throws IOException
     */
    public void read(InputStream in, int lengthToRead) throws IOException {
        int read = 0;
        do {
            grow(length);
            read = data.setBytes(length, in, Math.min(lengthToRead, data.length() - length));
            length += read;
            lengthToRead -= read;
        } while (lengthToRead > 0);
    }

    /**
     * Byte compare a set of bytes against the bytes in this dynamic array.
     * @param other source of the other bytes
     * @param otherOffset start offset in the other array
     * @param otherLength number of bytes in the other array
     * @param ourOffset the offset in our array
     * @param ourLength the number of bytes in our array
     * @return negative for less, 0 for equal, positive for greater
     */
    public int compare(byte[] other, int otherOffset, int otherLength, int ourOffset, int ourLength) {
        return 0 - data.compareTo(ourOffset, ourLength, other, otherOffset, otherLength);
    }

    public int compare(int otherOffset, int otherLength, int ourOffset, int ourLength) {
        return 0 - data.compareTo(ourOffset, ourLength, data, otherOffset, otherLength);
    }

    public boolean equals(byte[] other, int otherOffset, int otherLength, int ourOffset, int ourLength) {
        return data.equals(ourOffset, ourLength, other, otherOffset, otherLength);
    }

    /**
     * Set a text value from the bytes in this dynamic array.
     * @param result the value to set
     * @param offset the start of the bytes to copy
     * @param length the number of bytes to copy
     */
    public void setText(Text result, int offset, int length) {
        result.clear();
        result.set(data.getBytes(), offset, length);
    }

    /**
     * Write out a range of this dynamic array to an output stream.
     * @param out the stream to write to
     * @param offset the first offset to write
     * @param length the number of bytes to write
     * @throws IOException
     */
    public void write(OutputStream out, int offset, int length) throws IOException {
        data.getBytes(offset, out, length);
    }

    @Override
    public String toString() {
        int i;
        StringBuilder sb = new StringBuilder(length * 3);

        sb.append('{');
        int l = length - 1;
        for (i = 0; i < l; i++) {
            sb.append(Integer.toHexString(get(i)));
            sb.append(',');
        }
        sb.append(get(i));
        sb.append('}');

        return sb.toString();
    }

    public void setByteBuffer(ByteBuffer result, int offset, int length) {
        result.clear();
        result.put(data.getBytes(), offset, length);
    }
}