plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltChangeLocalityDetector.java

/*
 * Copyright 2000-2011 JetBrains s.r.o.
 *
 * 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.intellij.lang.xpath.xslt.impl;

import com.intellij.codeInsight.daemon.ChangeLocalityDetector;
import com.intellij.psi.PsiElement;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlElementType;
import com.intellij.psi.xml.XmlTag;
import com.intellij.psi.xml.XmlToken;
import org.intellij.lang.xpath.xslt.XsltSupport;
import org.jetbrains.annotations.NotNull;

/*
* Created by IntelliJ IDEA.
* User: sweinreuter
* Date: 31.01.11
*/
public class XsltChangeLocalityDetector implements ChangeLocalityDetector {
  @Override
  public PsiElement getChangeHighlightingDirtyScopeFor(@NotNull PsiElement changedElement) {
    try {
      if (changedElement instanceof XmlToken && changedElement.getNode().getElementType() == XmlElementType.XML_ATTRIBUTE_VALUE_TOKEN) {
        final PsiElement grandParent = changedElement.getParent().getParent();
        if (grandParent instanceof XmlAttribute) {
          if (XsltSupport.isXPathAttribute((XmlAttribute)grandParent)) {
            return grandParent;
          }
        }
      } else if (changedElement instanceof XmlTag && XsltSupport.isTemplate((XmlTag)changedElement, false)) {
        return changedElement;
      }
    } catch (NullPointerException e) {
      // sth was null
    }
    return null;
  }
}