com.sangupta.velocity.directives.EscapeHtmlDirective.java Source code

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Here is the source code for com.sangupta.velocity.directives.EscapeHtmlDirective.java

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/**
 *
 * velocity-tags - Collection of useful Apache Velocity directives
 * Copyright (c) 2010-2016, Sandeep Gupta
 * 
 * http://sangupta.com/projects/velocity-tags
 * 
 * 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 com.sangupta.velocity.directives;

import java.io.IOException;
import java.io.Writer;

import org.apache.commons.lang.StringEscapeUtils;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.directive.Directive;
import org.apache.velocity.runtime.parser.node.Node;

import com.sangupta.jerry.util.AssertUtils;

public class EscapeHtmlDirective extends Directive {

    @Override
    public String getName() {
        return "escapeHTML";
    }

    @Override
    public int getType() {
        return LINE;
    }

    @Override
    public boolean render(InternalContextAdapter context, Writer writer, Node node)
            throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
        String html = null;

        if (node.jjtGetChild(0) != null) {
            html = String.valueOf(node.jjtGetChild(0).value(context));
        }

        if (AssertUtils.isEmpty(html)) {
            return true;
        }

        writer.write(StringEscapeUtils.escapeHtml(html));
        return true;
    }

}