nz.net.ultraq.thymeleaf.layoutdialect.models.ElementMerger.groovy Maven / Gradle / Ivy
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A dialect for Thymeleaf that allows you to use layout/decorator templates to style your content.
The newest version!
/*
* Copyright 2015, 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.layoutdialect.models
import org.thymeleaf.context.ITemplateContext
import org.thymeleaf.model.AttributeValueQuotes
import org.thymeleaf.model.IModel
import org.thymeleaf.model.IOpenElementTag
import org.thymeleaf.model.IStandaloneElementTag
import groovy.transform.TupleConstructor
/**
* Merges an element and all its children into an existing element.
*
* @author Emanuel Rabina
*/
@TupleConstructor(defaults = false)
class ElementMerger implements ModelMerger {
final ITemplateContext context
/**
* Replace the content of the target element, with the content of the source
* element.
*
* @param targetModel
* @param sourceModel
* @return Model that is the result of the merge.
*/
@Override
IModel merge(IModel targetModel, IModel sourceModel) {
// If one of the parameters is missing return a copy of the other, or
// nothing if both parameters are missing.
if (!targetModel || !sourceModel) {
return targetModel?.cloneModel() ?: sourceModel?.cloneModel()
}
def modelFactory = context.modelFactory
// The result we want is the source model, but merged into the target root element attributes
def sourceRootEvent = sourceModel.first()
def sourceRootElement = modelFactory.createModel(sourceRootEvent)
def targetRootEvent = targetModel.first()
def targetRootElement = modelFactory.createModel(
sourceRootEvent instanceof IOpenElementTag ?
modelFactory.createOpenElementTag(sourceRootEvent.elementCompleteName,
targetRootEvent.attributeMap, AttributeValueQuotes.DOUBLE, false) :
sourceRootEvent instanceof IStandaloneElementTag ?
modelFactory.createStandaloneElementTag(sourceRootEvent.elementCompleteName,
targetRootEvent.attributeMap, AttributeValueQuotes.DOUBLE, false, sourceRootEvent.minimized) :
null)
def mergedRootElement = new AttributeMerger(context).merge(targetRootElement, sourceRootElement)
def mergedModel = sourceModel.cloneModel()
mergedModel.replace(0, mergedRootElement.first())
return mergedModel
}
}