cascading.tuple.hadoop.io.HadoopTupleInputStream.java Source code

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Here is the source code for cascading.tuple.hadoop.io.HadoopTupleInputStream.java

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/*
 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
 *
 * Project and contact information: http://www.cascading.org/
 *
 * This file is part of the Cascading project.
 *
 * 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 cascading.tuple.hadoop.io;

import java.io.IOException;
import java.io.InputStream;

import cascading.tuple.io.IndexTuple;
import cascading.tuple.io.TupleInputStream;
import org.apache.hadoop.io.WritableUtils;

/**
 *
 */
public class HadoopTupleInputStream extends TupleInputStream {
    public HadoopTupleInputStream(InputStream inputStream, ElementReader elementReader) {
        super(inputStream, elementReader);
    }

    public int getNumElements() throws IOException {
        return readVInt();
    }

    public int readToken() throws IOException {
        return readVInt();
    }

    public Object getNextElement() throws IOException {
        return readType(readToken());
    }

    public IndexTuple readIndexTuple(IndexTuple indexTuple) throws IOException {
        indexTuple.setIndex(readVInt());
        indexTuple.setTuple(readTuple());

        return indexTuple;
    }

    public long readVLong() throws IOException {
        return WritableUtils.readVLong(this);
    }

    public int readVInt() throws IOException {
        return WritableUtils.readVInt(this);
    }

    public String readString() throws IOException {
        return WritableUtils.readString(this);
    }

    protected final Object readType(int type) throws IOException {
        switch (type) {
        case 0:
            return null;
        case 1:
            return readString();
        case 2:
            return readFloat();
        case 3:
            return readDouble();
        case 4:
            return readVInt();
        case 5:
            return readVLong();
        case 6:
            return readBoolean();
        case 7:
            return readShort();
        case 8:
            return readTuple();
        case 9:
            return readTuplePair();
        case 10:
            return readIndexTuple();
        default:
            return elementReader.read(type, this);
        }
    }
}