/*
* 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.template;
/**
* <p>An extended hash interface with a couple of extra hooks. If a class
* implements this interface, then the built-in operators <code>?size</code>,
* <code>?keys</code>, and <code>?values</code> can be applied to its
* instances in the template.</p>
*
* <p>As of version 2.2.2, the engine will automatically wrap the
* collections returned by <code>keys</code> and <code>values</code> to
* present them as sequences to the template. For performance, you may
* wish to return objects that implement both TemplateCollectionModel
* and {@link TemplateSequenceModel}. Note that the wrapping to sequence happens
* on demand; if the template does not try to use the variable returned by
* <code>?keys</code> or <code>?values</code> as sequence (<code>theKeys?size</code>, or <code>theKeys[x]</code>,
* or <code>theKeys?sort</code>, etc.), just iterates over the variable
* (<code><#list foo?keys as k>...</code>), then no wrapping to
* sequence will happen, thus there will be no overhead.
*
* @author <a href="mailto:[email protected]">Jonathan Revusky</a>
* @see SimpleHash
* @version $Id: TemplateHashModelEx.java,v 1.13 2003/06/08 00:58:15 herbyderby Exp $
*/
public interface TemplateHashModelEx extends TemplateHashModel {
/**
* @return the number of key/value mappings in the hash.
*/
int size() throws TemplateModelException;
/**
* @return a collection containing the keys in the hash. Every element of
* the returned collection must implement the {@link TemplateScalarModel}
* (as the keys of hashes are always strings).
*/
TemplateCollectionModel keys() throws TemplateModelException;
/**
* @return a collection containing the values in the hash.
*/
TemplateCollectionModel values() throws TemplateModelException;
}
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