/*
* 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.utility;
import freemarker.template.SimpleNumber;
import freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateHashModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateModelIterator;
import freemarker.template.TemplateNumberModel;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateSequenceModel;
/**
* Frequently used constant {@link TemplateModel} values.
*
* <p>These constants should be stored in the {@link TemplateModel}
* sub-interfaces, but for bacward compatibility they are stored here instead.
* Starting from FreeMarker 2.4 they should be copyed (not moved!) into the
* {@link TemplateModel} sub-interfaces, and this class should be marked as
* deprecated.</p>
*
* @version $Id: Constants.java,v 1.2 2004/11/28 12:58:34 ddekany Exp $
*/
public class Constants {
public static final TemplateBooleanModel TRUE = TemplateBooleanModel.TRUE;
public static final TemplateBooleanModel FALSE = TemplateBooleanModel.FALSE;
public static final TemplateScalarModel EMPTY_STRING = (TemplateScalarModel) TemplateScalarModel.EMPTY_STRING;
public static final TemplateNumberModel ZERO = new SimpleNumber(0);
public static final TemplateNumberModel ONE = new SimpleNumber(1);
public static final TemplateNumberModel MINUS_ONE = new SimpleNumber(-1);
public static final TemplateModelIterator EMPTY_ITERATOR = new TemplateModelIterator() {
public TemplateModel next() throws TemplateModelException {
throw new TemplateModelException("The collection has no more elements.");
}
public boolean hasNext() throws TemplateModelException {
return false;
}
};
public static final TemplateCollectionModel EMPTY_COLLECTION = new TemplateCollectionModel() {
public TemplateModelIterator iterator() throws TemplateModelException {
return EMPTY_ITERATOR;
}
};
public static final TemplateSequenceModel EMPTY_SEQUENCE
= new TemplateSequenceModel() {
public TemplateModel get(int index) throws TemplateModelException {
return null;
}
public int size() throws TemplateModelException {
return 0;
}
};
public static final TemplateHashModelEx EMPTY_HASH = new TemplateHashModelEx() {
public int size() throws TemplateModelException {
return 0;
}
public TemplateCollectionModel keys() throws TemplateModelException {
return EMPTY_COLLECTION;
}
public TemplateCollectionModel values() throws TemplateModelException {
return EMPTY_COLLECTION;
}
public TemplateModel get(String key) throws TemplateModelException {
return null;
}
public boolean isEmpty() throws TemplateModelException {
return true;
}
};
}
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