/*
* 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.myfaces.tobago.internal.layout;
import org.apache.myfaces.tobago.layout.Measure;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
public class IntervalList extends ArrayList<Interval> {
private static final Logger LOG = LoggerFactory.getLogger(IntervalList.class);
private Measure minimum;
private Measure current;
public void evaluate() {
final List<Measure> minimumList = collectMinimum();
final List<Measure> maximumList = collectMaximum();
minimum = Measure.max(minimumList);
final Measure maximum = Measure.min(maximumList);
if (minimum.greaterThan(maximum)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Layout: Found a minimum constraint " + minimum
+ " which is greater than a maximum constraint " + maximum + "!");
}
current = minimum;
} else {
final List<Measure> preferred = findPreferredInInterval(minimum, maximum);
if (!preferred.isEmpty()) {
current = Measure.max(preferred);
} else {
current = minimum;
}
}
}
private List<Measure> collectMinimum() {
final List<Measure> result = new ArrayList<Measure>();
for (final Interval interval : this) {
if (interval.getMinimum() != null) {
result.add(interval.getMinimum());
}
if (interval.getCurrent() != null) {
result.add(interval.getCurrent());
}
}
return result;
}
private List<Measure> collectMaximum() {
final List<Measure> result = new ArrayList<Measure>();
for (final Interval interval : this) {
if (interval.getMaximum() != null) {
result.add(interval.getMaximum());
}
}
return result;
}
private List<Measure> findPreferredInInterval(final Measure min, final Measure max) {
final List<Measure> result = new ArrayList<Measure>();
for (final Interval interval : this) {
Measure value = interval.getCurrent();
if (value == null) {
value = interval.getPreferred();
}
if (value != null && value.greaterOrEqualThan(min) && value.lessOrEqualThan(max)) {
result.add(value);
}
}
return result;
}
public Measure getMinimum() {
return minimum;
}
public Measure getCurrent() {
return current;
}
}