xml/impl/src/com/intellij/xml/util/XmlIncludeHandler.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.xml.util;
  17
  18 import com.intellij.psi.PsiElement;
  19 import com.intellij.psi.PsiReference;
  20 import com.intellij.psi.impl.source.resolve.reference.impl.providers.FileReferenceSet;
  21 import com.intellij.psi.xml.*;
  22 import org.jetbrains.annotations.NonNls;
  23 import org.jetbrains.annotations.Nullable;
  24
  25 /**
  26  * @author mike
  27  */
  28 public class XmlIncludeHandler {
  29   @NonNls private static final String INCLUDE_TAG_NAME = "include";
  30   public static boolean isXInclude(PsiElement element) {
  31     if (element instanceof XmlTag) {
  32       XmlTag xmlTag = (XmlTag)element;
  33
  34       if (xmlTag.getParent() instanceof XmlDocument) return false;
  35
  36       if (xmlTag.getLocalName().equals(INCLUDE_TAG_NAME) && xmlTag.getAttributeValue("href") != null) {
  37         if (xmlTag.getNamespace().equals(XmlUtil.XINCLUDE_URI)) {
  38           return true;
  39         }
  40       }
  41     }
  42
  43     return false;
  44   }
  45
  46   @Nullable
  47   public static XmlFile resolveXIncludeFile(XmlTag xincludeTag) {
  48     final XmlAttribute hrefAttribute = xincludeTag.getAttribute("href", null);
  49     if (hrefAttribute == null) return null;
  50
  51     final XmlAttributeValue xmlAttributeValue = hrefAttribute.getValueElement();
  52     if (xmlAttributeValue == null) return null;
  53
  54     final FileReferenceSet referenceSet = FileReferenceSet.createSet(xmlAttributeValue, false, true, false);
  55
  56     final PsiReference reference = referenceSet.getLastReference();
  57     if (reference == null) return null;
  58
  59     final PsiElement target = reference.resolve();
  60
  61     if (!(target instanceof XmlFile)) return null;
  62     return (XmlFile)target;
  63   }
  64 }