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// Copyright (C) 2014 The Android Open Source Project
//
// 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 com.google.gerrit.index.query;
import com.google.common.primitives.Ints;
import com.google.gerrit.common.Nullable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public final class RangeUtil {
private static final Pattern RANGE_PATTERN = Pattern.compile("(>|>=|=|<|<=|)([+-]?\\d+)$");
private RangeUtil() {}
public static class Range {
/** The prefix of the query, before the range component. */
public final String prefix;
/** The minimum value specified in the query, inclusive. */
public final int min;
/** The maximum value specified in the query, inclusive. */
public final int max;
public Range(String prefix, int min, int max) {
this.prefix = prefix;
this.min = min;
this.max = max;
}
}
/**
* Determine the range of values being requested in the given query.
*
* @param rangeQuery the raw query, e.g. "{@code added:>12345}"
* @param minValue the minimum possible value for the field, inclusive
* @param maxValue the maximum possible value for the field, inclusive
* @return the calculated {@link Range}, or null if the query is invalid
*/
@Nullable
public static Range getRange(String rangeQuery, int minValue, int maxValue) {
Matcher m = RANGE_PATTERN.matcher(rangeQuery);
String prefix;
String test;
Integer queryInt;
if (m.find()) {
prefix = rangeQuery.substring(0, m.start());
test = m.group(1);
queryInt = value(m.group(2));
if (queryInt == null) {
return null;
}
} else {
return null;
}
return getRange(prefix, test, queryInt, minValue, maxValue);
}
/**
* Determine the range of values being requested in the given query.
*
* @param prefix a prefix string which is copied into the range
* @param test the test operator, one of >, >=, =, <, or <=
* @param queryInt the integer being queried
* @param minValue the minimum possible value for the field, inclusive
* @param maxValue the maximum possible value for the field, inclusive
* @return the calculated {@link Range}
*/
public static Range getRange(
String prefix, String test, int queryInt, int minValue, int maxValue) {
int min;
int max;
switch (test) {
case "=":
default:
min = max = queryInt;
break;
case ">":
min = Ints.saturatedCast(queryInt + 1L);
max = maxValue;
break;
case ">=":
min = queryInt;
max = maxValue;
break;
case "<":
min = minValue;
max = Ints.saturatedCast(queryInt - 1L);
break;
case "<=":
min = minValue;
max = queryInt;
break;
}
return new Range(prefix, min, max);
}
private static Integer value(String value) {
if (value.startsWith("+")) {
value = value.substring(1);
}
return Ints.tryParse(value);
}
}
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