nz.net.ultraq.thymeleaf.decorators.html.HtmlBodyDecorator.groovy Maven / Gradle / Ivy

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A dialect for Thymeleaf that allows you to use layout/decorator templates to style your content.

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/* 
 * Copyright 2013, Emanuel Rabina (http://www.ultraq.net.nz/)
 * 
 * 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 nz.net.ultraq.thymeleaf.decorators.html

import nz.net.ultraq.thymeleaf.decorators.Decorator
import nz.net.ultraq.thymeleaf.models.AttributeMerger

import org.thymeleaf.context.ITemplateContext
import org.thymeleaf.model.IModel

/**
 * A decorator specific to processing an HTML {@code } element.
 * 
 * @author Emanuel Rabina
 */
class HtmlBodyDecorator implements Decorator {

	private final ITemplateContext context

	/**
	 * Constructor, sets up the element decorator context.
	 * 
	 * @param context
	 */
	HtmlBodyDecorator(ITemplateContext context) {

		this.context = context
	}

	/**
	 * Decorate the {@code } part.
	 * 
	 * @param targetBodyModel
	 * @param sourceBodyModel
	 * @return Result of the decoration.
	 */
	@Override
	IModel decorate(IModel targetBodyModel, IModel sourceBodyModel) {

		// If one of the parameters is missing return a copy of the other, or
		// nothing if both parameters are missing.
		if (!targetBodyModel || !sourceBodyModel) {
			return targetBodyModel?.cloneModel() ?: sourceBodyModel?.cloneModel()
		}
		return new AttributeMerger(context).merge(targetBodyModel, sourceBodyModel)
	}
}