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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.calcite.avatica.util;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/** A range of time units. The first is more significant than the
* other (e.g. year-to-day) or the same as the other (e.g. month). */
public enum TimeUnitRange {
YEAR(TimeUnit.YEAR, null),
YEAR_TO_MONTH(TimeUnit.YEAR, TimeUnit.MONTH),
MONTH(TimeUnit.MONTH, null),
DAY(TimeUnit.DAY, null),
DAY_TO_HOUR(TimeUnit.DAY, TimeUnit.HOUR),
DAY_TO_MINUTE(TimeUnit.DAY, TimeUnit.MINUTE),
DAY_TO_SECOND(TimeUnit.DAY, TimeUnit.SECOND),
HOUR(TimeUnit.HOUR, null),
HOUR_TO_MINUTE(TimeUnit.HOUR, TimeUnit.MINUTE),
HOUR_TO_SECOND(TimeUnit.HOUR, TimeUnit.SECOND),
MINUTE(TimeUnit.MINUTE, null),
MINUTE_TO_SECOND(TimeUnit.MINUTE, TimeUnit.SECOND),
SECOND(TimeUnit.SECOND, null);
public final TimeUnit startUnit;
public final TimeUnit endUnit;
private static final Map, TimeUnitRange> MAP = createMap();
/**
* Creates a TimeUnitRange.
*
* @param startUnit Start time unit
* @param endUnit End time unit
*/
TimeUnitRange(TimeUnit startUnit, TimeUnit endUnit) {
assert startUnit != null;
this.startUnit = startUnit;
this.endUnit = endUnit;
}
/**
* Returns a {@code TimeUnitRange} with a given start and end unit.
*
* @param startUnit Start unit
* @param endUnit End unit
* @return Time unit range, or null if not valid
*/
public static TimeUnitRange of(TimeUnit startUnit, TimeUnit endUnit) {
return MAP.get(new Pair(startUnit, endUnit));
}
private static Map, TimeUnitRange> createMap() {
Map, TimeUnitRange> map =
new HashMap, TimeUnitRange>();
for (TimeUnitRange value : values()) {
map.put(new Pair(value.startUnit, value.endUnit), value);
}
return Collections.unmodifiableMap(map);
}
/** Whether this is in the YEAR-TO-MONTH family of intervals. */
public boolean monthly() {
return ordinal() <= MONTH.ordinal();
}
/** Immutable pair of values of the same type. */
private static class Pair {
final E left;
final E right;
private Pair(E left, E right) {
this.left = left;
this.right = right;
}
@Override public int hashCode() {
int k = (left == null) ? 0 : left.hashCode();
int k1 = (right == null) ? 0 : right.hashCode();
return ((k << 4) | k) ^ k1;
}
@Override public boolean equals(Object obj) {
return obj == this
|| obj instanceof Pair
&& equals(left, ((Pair) obj).left)
&& equals(right, ((Pair) obj).right);
}
private static boolean equals(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}
}
}
// End TimeUnitRange.java
