org.archive.bacon.ParseTimestamp.java Source code

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Here is the source code for org.archive.bacon.ParseTimestamp.java

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/*
 * Copyright 2011 Internet Archive
 *
 * 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 org.archive.bacon;

import java.io.*;
import java.net.*;
import java.util.*;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import org.apache.pig.EvalFunc;
import org.apache.pig.FuncSpec;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.util.WrappedIOException;

/**
 * Parse both WARC and ARC format timestamps.
 */
public class ParseTimestamp extends EvalFunc<String> {

    public ParseTimestamp() throws IOException {

    }

    public String exec(Tuple input) throws IOException {
        if (input == null || input.size() == 0)
            return null;

        try {
            String date = (String) input.get(0);

            int len = date.length();

            String format = null;

            if (len == 12)
                format = "YYYYMMddHHmm";
            if (len == 14)
                format = "YYYYMMddHHmmss";
            if (len == 20)
                format = "YYYY-MM-dd'T'HH:mm:ss'Z'";

            if (format == null)
                return null; // Unknown format.

            // Set the time to default or the output is in UTC
            DateTimeZone.setDefault(DateTimeZone.UTC);

            // See http://joda-time.sourceforge.net/api-release/org/joda/time/format/DateTimeFormat.html
            DateTimeFormatter parser = DateTimeFormat.forPattern(format);
            DateTime result = parser.parseDateTime(date);

            return result.toString();
        } catch (Exception e) {
            // If we have any problems parsing the date, just return null;
            return null;
        }
    }

    @Override
    public Schema outputSchema(Schema input) {
        return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input),
                DataType.CHARARRAY));
    }

    @Override
    public List<FuncSpec> getArgToFuncMapping() throws FrontendException {
        List<FuncSpec> funcList = new ArrayList<FuncSpec>();
        Schema s = new Schema();
        s.add(new Schema.FieldSchema(null, DataType.CHARARRAY));
        funcList.add(new FuncSpec(this.getClass().getName(), s));
        return funcList;
    }

}