org.apache.hadoop.record.CsvRecordOutput.java Source code

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Here is the source code for org.apache.hadoop.record.CsvRecordOutput.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.hadoop.record;

import java.io.IOException;
import java.util.TreeMap;
import java.util.ArrayList;
import java.io.PrintStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * @deprecated Replaced by <a href="http://hadoop.apache.org/avro/">Avro</a>.
 */
@Deprecated
@InterfaceAudience.Public
@InterfaceStability.Stable
public class CsvRecordOutput implements RecordOutput {

    private PrintStream stream;
    private boolean isFirst = true;

    private void throwExceptionOnError(String tag) throws IOException {
        if (stream.checkError()) {
            throw new IOException("Error serializing " + tag);
        }
    }

    private void printCommaUnlessFirst() {
        if (!isFirst) {
            stream.print(",");
        }
        isFirst = false;
    }

    /** Creates a new instance of CsvRecordOutput */
    public CsvRecordOutput(OutputStream out) {
        try {
            stream = new PrintStream(out, true, "UTF-8");
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException(ex);
        }
    }

    @Override
    public void writeByte(byte b, String tag) throws IOException {
        writeLong((long) b, tag);
    }

    @Override
    public void writeBool(boolean b, String tag) throws IOException {
        printCommaUnlessFirst();
        String val = b ? "T" : "F";
        stream.print(val);
        throwExceptionOnError(tag);
    }

    @Override
    public void writeInt(int i, String tag) throws IOException {
        writeLong((long) i, tag);
    }

    @Override
    public void writeLong(long l, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print(l);
        throwExceptionOnError(tag);
    }

    @Override
    public void writeFloat(float f, String tag) throws IOException {
        writeDouble((double) f, tag);
    }

    @Override
    public void writeDouble(double d, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print(d);
        throwExceptionOnError(tag);
    }

    @Override
    public void writeString(String s, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print(Utils.toCSVString(s));
        throwExceptionOnError(tag);
    }

    @Override
    public void writeBuffer(Buffer buf, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print(Utils.toCSVBuffer(buf));
        throwExceptionOnError(tag);
    }

    @Override
    public void startRecord(Record r, String tag) throws IOException {
        if (tag != null && !tag.isEmpty()) {
            printCommaUnlessFirst();
            stream.print("s{");
            isFirst = true;
        }
    }

    @Override
    public void endRecord(Record r, String tag) throws IOException {
        if (tag == null || tag.isEmpty()) {
            stream.print("\n");
            isFirst = true;
        } else {
            stream.print("}");
            isFirst = false;
        }
    }

    @Override
    public void startVector(ArrayList v, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print("v{");
        isFirst = true;
    }

    @Override
    public void endVector(ArrayList v, String tag) throws IOException {
        stream.print("}");
        isFirst = false;
    }

    @Override
    public void startMap(TreeMap v, String tag) throws IOException {
        printCommaUnlessFirst();
        stream.print("m{");
        isFirst = true;
    }

    @Override
    public void endMap(TreeMap v, String tag) throws IOException {
        stream.print("}");
        isFirst = false;
    }
}