Package nz.net.ultraq.thymeleaf.include

Source Code of nz.net.ultraq.thymeleaf.include.IncludeProcessor

/*
* Copyright 2012, 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.include;

import nz.net.ultraq.thymeleaf.AbstractContentProcessor;
import static nz.net.ultraq.thymeleaf.FragmentProcessor.PROCESSOR_NAME_FRAGMENT;
import static nz.net.ultraq.thymeleaf.LayoutDialect.DIALECT_PREFIX_LAYOUT;

import org.thymeleaf.Arguments;
import org.thymeleaf.dom.Element;
import org.thymeleaf.dom.Node;
import org.thymeleaf.processor.ProcessorResult;
import org.thymeleaf.standard.fragment.StandardFragment;
import org.thymeleaf.standard.fragment.StandardFragmentProcessor;

import java.util.List;
import java.util.Map;

/**
* Similar to Thymeleaf's <tt>th:include</tt>, but allows the passing of entire
* element fragments to the included template.  Useful if you have some HTML
* that you want to reuse, but whose contents are too complex to determine or
* construct with context variables alone.
*
* @author Emanuel Rabina
*/
public class IncludeProcessor extends AbstractContentProcessor {

  public static final String PROCESSOR_NAME_INCLUDE = "include";

  /**
   * Constructor, sets this processor to work on the 'include' attribute.
   */
  public IncludeProcessor() {

    super(PROCESSOR_NAME_INCLUDE);
  }

  /**
   * Locates the specified page and includes it into the current template.
   *
   * @param arguments
   * @param element
   * @param attributeName
   * @return Result of the processing.
   */
  @Override
  protected ProcessorResult processAttribute(Arguments arguments, Element element, String attributeName) {

    // Locate the page and fragment to include
    StandardFragment fragment = StandardFragmentProcessor.computeStandardFragmentSpec(
        arguments.getConfiguration(), arguments, element.getAttributeValue(attributeName),
        DIALECT_PREFIX_LAYOUT, PROCESSOR_NAME_FRAGMENT);
    List<Node> includefragments = fragment.extractFragment(arguments.getConfiguration(),
        arguments, arguments.getTemplateRepository());

    element.removeAttribute(attributeName);

    // Gather all fragment parts within the include element
    Map<String,Object> pagefragments = findFragments(element.getElementChildren());

    // Replace the children of this element with those of the include page fragments.
    element.clearChildren();
    if (includefragments != null) {
      Element containerelement = new Element("container");
      for (Node includefragment: includefragments) {
        containerelement.addChild(includefragment);
        containerelement.extractChild(includefragment);
      }
      for (Node extractedchild: containerelement.getChildren()) {
        element.addChild(extractedchild);
      }
    }

    // Scope any fragment parts for the include page to the current element
    return !pagefragments.isEmpty() ?
        ProcessorResult.setLocalVariables(pagefragments) :
        ProcessorResult.OK;
  }
}
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