/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import freemarker.template.*;
import java.util.*;
import java.io.Serializable;
/**
* 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;
}
}
}
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