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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.core;

import freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateModel;

final class BooleanLiteral extends Expression {

    private final boolean val;

    public BooleanLiteral(boolean val) {
        this.val = val;
    }

    static TemplateBooleanModel getTemplateModel(boolean b) {
        return b? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE;
    }

    boolean evalToBoolean(Environment env) {
        return val;
    }

    public String getCanonicalForm() {
        return val ? MiscUtil.C_TRUE : MiscUtil.C_FALSE;
    }

    String getNodeTypeSymbol() {
        return getCanonicalForm();
    }
    
    public String toString() {
        return val ? MiscUtil.C_TRUE : MiscUtil.C_FALSE;
    }

    TemplateModel _eval(Environment env) {
        return val ? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE;
    }
    
    boolean isLiteral() {
        return true;
    }

    protected Expression deepCloneWithIdentifierReplaced_inner(
            String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
    	return new BooleanLiteral(val);
    }
    
    int getParameterCount() {
        return 0;
    }

    Object getParameterValue(int idx) {
        throw new IndexOutOfBoundsException();
    }

    ParameterRole getParameterRole(int idx) {
        throw new IndexOutOfBoundsException();
    }
    
}