| /* |
| * 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.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 ?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; |
| } |
| |
| public TemplateModelIterator iterator() throws TemplateModelException { |
| if (collection != null) { |
| return collection.iterator(); |
| } else { |
| return new SequenceIterator(sequence); |
| } |
| } |
| |
| public TemplateModel get(int i) throws TemplateModelException { |
| if (sequence != null) { |
| return sequence.get(i); |
| } else { |
| initSequence(); |
| return (TemplateModel) data.get(i); |
| } |
| } |
| |
| public int size() throws TemplateModelException { |
| if (sequence != null) { |
| return sequence.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()); |
| } |
| } |
| } |
| |
| private static class SequenceIterator |
| implements TemplateModelIterator { |
| private final TemplateSequenceModel sequence; |
| private final int size; |
| private int index = 0; |
| |
| SequenceIterator(TemplateSequenceModel sequence) throws TemplateModelException { |
| this.sequence = sequence; |
| this.size = sequence.size(); |
| |
| } |
| public TemplateModel next() throws TemplateModelException { |
| return sequence.get(index++); |
| } |
| |
| public boolean hasNext() { |
| return index < size; |
| } |
| } |
| } |