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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * Licensed 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.template;


/**
 * "boolean" template language data type; same as in Java; either {@code true} or {@code false}.
 */
public interface TemplateBooleanModel extends TemplateModel {

    /**
     * @return whether to interpret this object as true or false in a boolean context
     */
    boolean getAsBoolean() throws TemplateModelException;
    
    /**
     * A singleton object to represent boolean false
     */
    TemplateBooleanModel FALSE = new SerializableTemplateBooleanModel() {
        public boolean getAsBoolean() {
            return false;
        }
        private Object readResolve() {
            return FALSE;
        }
    };

    /**
     * A singleton object to represent boolean true
     */
    TemplateBooleanModel TRUE = new SerializableTemplateBooleanModel() {
        public boolean getAsBoolean() {
            return true;
        }
        private Object readResolve() {
            return TRUE;
        }
    };
    
}