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Next generation template engine for Java

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/**
 * Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 *   Author: Guoqiang Chen
 *    Email: [email protected]
 *   WebURL: https://github.com/subchen
 *
 * 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 jetbrick.template.parser.ast;

import jetbrick.template.runtime.InterpretContext;

public final class AstDirectiveIf extends AstDirective {
    private final AstExpression conditionExpression;
    private final AstStatementList thenStatement;
    private final AstStatement elseStatement;

    public AstDirectiveIf(AstExpression conditionExpression, AstStatementList thenStatement, AstStatement elseStatement, Position position) {
        super(position);
        this.conditionExpression = conditionExpression;
        this.thenStatement = thenStatement;
        this.elseStatement = elseStatement;
    }

    @Override
    public void execute(InterpretContext ctx) {
        Object value = conditionExpression.execute(ctx);
        if (ALU.isTrue(value)) {
            thenStatement.execute(ctx);
        } else {
            if (elseStatement != null) {
                elseStatement.execute(ctx);
            }
        }
    }
}