org.apache.jackrabbit.oak.plugins.nodetype.constraint.NumericConstraint Maven / Gradle / Ivy
/*
* 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.jackrabbit.oak.plugins.nodetype.constraint;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import com.google.common.base.Predicate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class NumericConstraint implements Predicate {
private static final Logger log = LoggerFactory.getLogger(NumericConstraint.class);
private boolean invalid;
private boolean lowerInclusive;
private T lowerBound;
private T upperBound;
private boolean upperInclusive;
protected NumericConstraint(String definition) {
// format: '(, )', '[, ]', '(, )' etc.
Pattern pattern = Pattern.compile("([\\(\\[])([^,]*),([^\\)\\]]*)([\\)\\]])");
Matcher matcher = pattern.matcher(definition);
if (matcher.matches()) {
try {
// group 1 is lower bound inclusive/exclusive
lowerInclusive = "[".equals(matcher.group(1));
// group 2 is lower, group 3 is upper bound
lowerBound = getBound(matcher.group(2));
upperBound = getBound(matcher.group(3));
// group 4 is upper bound inclusive/exclusive
upperInclusive = "]".equals(matcher.group(4));
}
catch (NumberFormatException e) {
invalid(definition);
}
}
else {
invalid(definition);
}
}
private void invalid(String definition) {
invalid = true;
log.warn('\'' + definition + "' is not a valid value constraint format for numeric values");
}
protected abstract T getBound(String bound);
@Override
public boolean apply(@Nullable Value value) {
if (value == null || invalid) {
return false;
}
try {
T t = getValue(value);
if (lowerBound != null) {
if (lowerInclusive) {
if (less(t, lowerBound)) {
return false;
}
} else {
if (lessOrEqual(t, lowerBound)) {
return false;
}
}
}
if (upperBound != null) {
if (upperInclusive) {
if (greater(t, upperBound)) {
return false;
}
} else {
if (greaterOrEqual(t, upperBound)) {
return false;
}
}
}
return true;
}
catch (RepositoryException e) {
log.warn("Error checking numeric constraint " + this, e);
return false;
}
}
protected abstract T getValue(Value value) throws RepositoryException;
protected abstract boolean less(T val, T bound);
protected boolean greater(T val, T bound) {
return less(bound, val);
}
protected boolean equals(T val, T bound) {
return val.equals(bound);
}
protected boolean greaterOrEqual(T val, T bound) {
return greater(val, bound) || equals(val, bound);
}
protected boolean lessOrEqual(T val, T bound) {
return less(val, bound) || equals(val, bound);
}
@Override
public String toString() {
return (lowerInclusive ? "[" : "(") +
(lowerBound == null ? "" : lowerBound) + ", " +
(upperBound == null ? "" : upperBound) +
(upperInclusive ? "]" : ")");
}}