org.apache.accumulo.examples.wikisearch.util.TextUtil.java Source code

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Here is the source code for org.apache.accumulo.examples.wikisearch.util.TextUtil.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.accumulo.examples.wikisearch.util;

import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;

import org.apache.accumulo.core.iterators.user.SummingCombiner;
import org.apache.hadoop.io.Text;

public class TextUtil {

    /**
     * Appends a null byte followed by the UTF-8 bytes of the given string to the given {@link Text}
     *
     * @param text
     *          the Text to which to append
     * @param string
     *          the String to append
     */
    public static void textAppend(Text text, String string) {
        appendNullByte(text);
        textAppendNoNull(text, string);
    }

    public static void textAppend(Text text, String string, boolean replaceBadChar) {
        appendNullByte(text);
        textAppendNoNull(text, string, replaceBadChar);
    }

    public static void textAppend(Text t, long s) {
        t.append(nullByte, 0, 1);
        t.append(SummingCombiner.FIXED_LEN_ENCODER.encode(s), 0, 8);
    }

    private static final byte[] nullByte = { 0 };

    /**
     * Appends a null byte to the given text
     *
     * @param text
     *          the text to which to append the null byte
     */
    public static void appendNullByte(Text text) {
        text.append(nullByte, 0, nullByte.length);
    }

    /**
     * Appends the UTF-8 bytes of the given string to the given {@link Text}
     *
     * @param t
     *          the Text to which to append
     * @param s
     *          the String to append
     */
    public static void textAppendNoNull(Text t, String s) {
        textAppendNoNull(t, s, false);
    }

    /**
     * Appends the UTF-8 bytes of the given string to the given {@link Text}
     */
    public static void textAppendNoNull(Text t, String s, boolean replaceBadChar) {
        try {
            ByteBuffer buffer = Text.encode(s, replaceBadChar);
            t.append(buffer.array(), 0, buffer.limit());
        } catch (CharacterCodingException cce) {
            throw new IllegalArgumentException(cce);
        }
    }

    /**
     * Converts the given string its UTF-8 bytes. This uses Hadoop's method for converting string to
     * UTF-8 and is much faster than calling {@link String#getBytes(String)}.
     *
     * @param string
     *          the string to convert
     * @return the UTF-8 representation of the string
     */
    public static byte[] toUtf8(String string) {
        ByteBuffer buffer;
        try {
            buffer = Text.encode(string, false);
        } catch (CharacterCodingException cce) {
            throw new IllegalArgumentException(cce);
        }
        byte[] bytes = new byte[buffer.limit()];
        System.arraycopy(buffer.array(), 0, bytes, 0, bytes.length);
        return bytes;
    }
}