org.thymeleaf.processor.attr.AbstractConditionalFixedValueAttrProcessor Maven / Gradle / Ivy

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Modern server-side Java template engine for both web and standalone environments
There is a newer version: 3.1.3.RELEASE
/*
 * =============================================================================
 * 
 *   Copyright (c) 2011, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   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 org.thymeleaf.processor.attr;

import org.thymeleaf.Arguments;
import org.thymeleaf.exceptions.AttrProcessorException;
import org.thymeleaf.templateresolver.TemplateResolution;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * 
 * @author Daniel Fernández
 * 
 * @since 1.0
 *
 */
public abstract class AbstractConditionalFixedValueAttrProcessor 
        extends AbstractAttrProcessor {

    
    
    
    public AbstractConditionalFixedValueAttrProcessor() {
        super();
    }




    
    
    
    public final AttrProcessResult process(
            final Arguments arguments, final TemplateResolution templateResolution, 
            final Document document, final Element element, 
            final Attr attribute) {
        
        final String attributeName = attribute.getName();
        String attributeValue = attribute.getValue();

        if (attributeValue == null || attributeValue.trim().equals("")) {
            throw new AttrProcessorException("Empty value for \"" +
                    attribute.getName() + "\" attribute not allowed");
        }
        
        attributeValue = attributeValue.trim();

        final boolean visible = 
            isVisible(arguments, templateResolution, document, element, attribute, attributeName, attributeValue);
        
        final String targetAttributeName = 
            getTargetAttributeName(arguments, document, element, attribute, attributeName, attributeValue);

        if (!visible) {
            element.removeAttribute(targetAttributeName);
            return AttrProcessResult.REMOVE_ATTRIBUTE;
        }

        final String targetAttributeFixedValue = 
            getTargetAttributeFixedValue(arguments, document, element, attribute, attributeName, attributeValue);
        final Attr targetAttribute = document.createAttribute(targetAttributeName);
        targetAttribute.setValue(targetAttributeFixedValue);
        
        element.setAttributeNode(targetAttribute);
        
        return AttrProcessResult.REMOVE_ATTRIBUTE;
        
    }


    
    
    protected abstract boolean isVisible(
            final Arguments arguments, final TemplateResolution templateResolution, 
            final Document document, final Element element, 
            final Attr attribute, final String attributeName, final String attributeValue);


    
    
    protected abstract String getTargetAttributeName(final Arguments arguments, final Document document, 
            final Element element, final Attr attribute, final String attributeName, final String attributeValue);
    
    protected abstract String getTargetAttributeFixedValue(final Arguments arguments, final Document document, 
            final Element element, final Attr attribute, final String attributeName, final String attributeValue);
    
    
}