org.apache.tajo.datum.DateDatum.java Source code

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Here is the source code for org.apache.tajo.datum.DateDatum.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.tajo.datum;

import org.apache.tajo.common.TajoDataTypes;
import org.apache.tajo.datum.exception.InvalidCastException;
import org.apache.tajo.datum.exception.InvalidOperationException;
import org.apache.tajo.util.Bytes;
import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

public class DateDatum extends Datum {
    public static final int SIZE = 4;
    /** ISO 8601/SQL standard format - ex) 1997-12-17 */
    public static final String DEFAULT_FORMAT_STRING = "yyyy-MM-dd";
    private static final DateTimeFormatter DEFAULT_FORMATTER = DateTimeFormat.forPattern(DEFAULT_FORMAT_STRING);
    private final LocalDate date;

    public DateDatum(int value) {
        super(TajoDataTypes.Type.DATE);
        date = decode(value);
    }

    public DateDatum(int year, int month, int day) {
        super(TajoDataTypes.Type.DATE);
        date = new LocalDate(year, month, day);
    }

    public DateDatum(String dateStr) {
        super(TajoDataTypes.Type.DATE);
        this.date = LocalDate.parse(dateStr, DEFAULT_FORMATTER);
    }

    public DateDatum(LocalDate date) {
        super(TajoDataTypes.Type.DATE);
        this.date = date;
    }

    public DateDatum(byte[] bytes) {
        this(Bytes.toInt(bytes));
    }

    public int getCenturyOfEra() {
        return date.getCenturyOfEra();
    }

    public int getYear() {
        return date.getYear();
    }

    public int getMonthOfYear() {
        return date.getMonthOfYear();
    }

    public int getWeekyear() {
        return date.getWeekyear();
    }

    public int getWeekOfWeekyear() {
        return date.getWeekOfWeekyear();
    }

    public int getDayOfWeek() {
        return date.getDayOfWeek();
    }

    public int getDayOfMonth() {
        return date.getDayOfMonth();
    }

    public int getDayOfYear() {
        return date.getDayOfYear();
    }

    public String toString() {
        return asChars();
    }

    @Override
    public int asInt4() {
        return encode();
    }

    private static LocalDate decode(int val) {
        int year = (val >> 16);
        int monthOfYear = (0xFFFF & val) >> 8;
        int dayOfMonth = (0x00FF & val);
        return new LocalDate(year, monthOfYear, dayOfMonth);
    }

    /**
     *   Year     MonthOfYear   DayOfMonth
     *  31-16       15-8          7 - 0
     *
     * 0xFF 0xFF    0xFF          0xFF
     */
    private int encode() {
        int instance = 0;
        instance |= (date.getYear() << 16); // 1970 ~ : 2 bytes
        instance |= (date.getMonthOfYear() << 8); // 1 - 12 : 1 byte
        instance |= (date.getDayOfMonth()); // 0 - 31 : 1 byte
        return instance;
    }

    @Override
    public long asInt8() {
        return encode();
    }

    @Override
    public float asFloat4() {
        throw new InvalidCastException();
    }

    @Override
    public double asFloat8() {
        throw new InvalidCastException();
    }

    @Override
    public String asChars() {
        return date.toString(DEFAULT_FORMATTER);
    }

    public String toChars(String format) {
        return date.toString(format);
    }

    @Override
    public int size() {
        return SIZE;
    }

    @Override
    public byte[] asByteArray() {
        return Bytes.toBytes(encode());
    }

    @Override
    public Datum equalsTo(Datum datum) {
        if (datum.type() == TajoDataTypes.Type.TIME) {
            return DatumFactory.createBool(date.equals(((DateDatum) datum).date));
        } else if (datum instanceof NullDatum || datum.isNull()) {
            return datum;
        } else {
            throw new InvalidOperationException();
        }
    }

    @Override
    public int compareTo(Datum datum) {
        if (datum.type() == TajoDataTypes.Type.DATE) {
            return date.compareTo(((DateDatum) datum).date);
        } else if (datum instanceof NullDatum || datum.isNull()) {
            return -1;
        } else {
            throw new InvalidOperationException();
        }
    }

    public boolean equals(Object obj) {
        if (obj instanceof NullDatum) {
            return false;
        }
        if (obj instanceof DateDatum) {
            DateDatum another = (DateDatum) obj;
            return date.isEqual(another.date);
        } else {
            throw new InvalidOperationException();
        }
    }

    @Override
    public int hashCode() {
        return date.hashCode();
    }
}