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Liferay Portal Template FreeMarker
/*
* 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 freemarker.core;
import java.io.Serializable;
import java.util.ArrayList;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateCollectionModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateModelIterator;
import freemarker.template.TemplateSequenceModel;
/**
* Add sequence capabilities to an existing collection, or
* vice versa. Used by the ?keys and ?values built-ins.
*/
final public class CollectionAndSequence
implements TemplateCollectionModel, TemplateSequenceModel, Serializable {
private TemplateCollectionModel collection;
private TemplateSequenceModel sequence;
private ArrayList data;
public CollectionAndSequence(TemplateCollectionModel collection) {
this.collection = collection;
}
public CollectionAndSequence(TemplateSequenceModel sequence) {
this.sequence = sequence;
}
@Override
public TemplateModelIterator iterator() throws TemplateModelException {
if (collection != null) {
return collection.iterator();
} else {
return new SequenceIterator(sequence);
}
}
@Override
public TemplateModel get(int i) throws TemplateModelException {
if (sequence != null) {
return sequence.get(i);
} else {
initSequence();
return data.get(i);
}
}
@Override
public int size() throws TemplateModelException {
if (sequence != null) {
return sequence.size();
} if (collection instanceof TemplateCollectionModelEx) {
return ((TemplateCollectionModelEx) collection).size();
} else {
initSequence();
return data.size();
}
}
private void initSequence() throws TemplateModelException {
if (data == null) {
data = new ArrayList<>();
TemplateModelIterator it = collection.iterator();
while (it.hasNext()) {
data.add(it.next());
}
}
}
}
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