com.jfolson.hive.serde.RTypedBytesRecordInput.java Source code

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Here is the source code for com.jfolson.hive.serde.RTypedBytesRecordInput.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 com.jfolson.hive.serde;

import java.io.DataInput;
import java.io.IOException;

import org.apache.hadoop.record.Buffer;
import org.apache.hadoop.record.Index;
import org.apache.hadoop.record.RecordInput;

/**
 * Serializer for records that writes typed bytes.
 */
public class RTypedBytesRecordInput implements RecordInput {

    private RTypedBytesInput in;

    private RTypedBytesRecordInput() {
    }

    private void setTypedBytesInput(RTypedBytesInput in) {
        this.in = in;
    }

    private static ThreadLocal tbIn = new ThreadLocal() {
        @Override
        protected synchronized Object initialValue() {
            return new RTypedBytesRecordInput();
        }
    };

    /**
     * Get a thread-local typed bytes record input for the supplied
     * {@link TypedBytesInput}.
     * 
     * @param in
     *          typed bytes input object
     * @return typed bytes record input corresponding to the supplied
     *         {@link TypedBytesInput}.
     */
    public static RTypedBytesRecordInput get(RTypedBytesInput in) {
        RTypedBytesRecordInput bin = (RTypedBytesRecordInput) tbIn.get();
        bin.setTypedBytesInput(in);
        return bin;
    }

    /**
     * Get a thread-local typed bytes record input for the supplied
     * {@link DataInput}.
     * 
     * @param in
     *          data input object
     * @return typed bytes record input corresponding to the supplied
     *         {@link DataInput}.
     */
    public static RTypedBytesRecordInput get(DataInput in) {
        return get(RTypedBytesInput.get(in));
    }

    /** Creates a new instance of TypedBytesRecordInput. */
    public RTypedBytesRecordInput(RTypedBytesInput in) {
        this.in = in;
    }

    /** Creates a new instance of TypedBytesRecordInput. */
    public RTypedBytesRecordInput(DataInput in) {
        this(new RTypedBytesInput(in));
    }

    public boolean readBool(String tag) throws IOException {
        in.skipType();
        return in.readBool();
    }

    public Buffer readBuffer(String tag) throws IOException {
        in.skipType();
        return new Buffer(in.readBytes());
    }

    public byte readByte(String tag) throws IOException {
        in.skipType();
        return in.readByte();
    }

    public double readDouble(String tag) throws IOException {
        in.skipType();
        return in.readDouble();
    }

    public float readFloat(String tag) throws IOException {
        in.skipType();
        return in.readFloat();
    }

    public int readInt(String tag) throws IOException {
        in.skipType();
        return in.readInt();
    }

    public long readLong(String tag) throws IOException {
        in.skipType();
        return in.readLong();
    }

    public String readString(String tag) throws IOException {
        in.skipType();
        return in.readString();
    }

    public void startRecord(String tag) throws IOException {
        in.skipType();
    }

    public Index startVector(String tag) throws IOException {
        in.skipType();
        return new TypedBytesIndex(in.readVectorHeader());
    }

    public Index startMap(String tag) throws IOException {
        in.skipType();
        return new TypedBytesIndex(in.readMapHeader());
    }

    public void endRecord(String tag) throws IOException {
    }

    public void endVector(String tag) throws IOException {
    }

    public void endMap(String tag) throws IOException {
    }

    private static final class TypedBytesIndex implements Index {
        private int nelems;

        private TypedBytesIndex(int nelems) {
            this.nelems = nelems;
        }

        public boolean done() {
            return (nelems <= 0);
        }

        public void incr() {
            nelems--;
        }
    }

}