Interval.java

// 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.
// This file is copied from
// https://github.com/apache/hive/blob/master/hplsql/src/main/java/org/apache/hive/hplsql/Interval.java
// and modified by Doris

package org.apache.doris.plsql;

import java.sql.Date;
import java.sql.Timestamp;
import java.util.Calendar;

/**
 * Date and time interval
 */
public class Interval {
    int days = 0;
    int milliseconds = 0;

    /**
     * Add or subtract interval value to the specified date
     */
    public Date dateChange(Date in, boolean add) {
        Calendar c = Calendar.getInstance();
        c.setTimeInMillis(in.getTime());
        calendarChange(c, add);
        return new Date(c.getTimeInMillis());
    }

    /**
     * Add or subtract interval value to the specified timestamp
     */
    public Timestamp timestampChange(Timestamp in, boolean add) {
        Calendar c = Calendar.getInstance();
        c.setTimeInMillis(in.getTime());
        calendarChange(c, add);
        return new Timestamp(c.getTimeInMillis());
    }

    /**
     * Add interval value to the specified Calendar value
     */
    public Calendar calendarChange(Calendar c, boolean add) {
        int a = 1;
        if (!add) {
            a = -1;
        }
        if (days != 0) {
            c.add(Calendar.DAY_OF_MONTH, days * a);
        }
        if (milliseconds != 0) {
            c.setTimeInMillis(c.getTimeInMillis() + milliseconds * a);
        }
        return c;
    }

    /**
     * Set interval value
     */
    public Interval set(int value, String item) {
        if (item.compareToIgnoreCase("DAYS") == 0 || item.compareToIgnoreCase("DAY") == 0) {
            setDays(value);
        }
        if (item.compareToIgnoreCase("MICROSECONDS") == 0 || item.compareToIgnoreCase("MICROSECOND") == 0) {
            setMilliseconds(value);
        }
        return this;
    }

    /**
     * Set interval items
     */
    public void setDays(int days) {
        this.days = days;
    }

    public void setMilliseconds(int milliseconds) {
        this.milliseconds = milliseconds;
    }

    /**
     * Convert interval to string
     */
    @Override
    public String toString() {
        StringBuilder s = new StringBuilder();
        if (days != 0) {
            s.append(days);
            s.append(" days");
        }
        if (milliseconds != 0) {
            s.append(milliseconds);
            s.append(" milliseconds");
        }
        return s.toString();
    }
}