xml/impl/src/com/intellij/lang/xml/XmlFileViewProvider.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.lang.xml;
  17
  18 import com.intellij.lang.Language;
  19 import com.intellij.lang.LanguageFilter;
  20 import com.intellij.openapi.vfs.VirtualFile;
  21 import com.intellij.psi.CompositeLanguageFileViewProvider;
  22 import com.intellij.psi.PsiManager;
  23 import com.intellij.psi.templateLanguages.TemplateLanguage;
  24 import org.jetbrains.annotations.NotNull;
  25
  26 import java.util.*;
  27
  28 public class XmlFileViewProvider extends CompositeLanguageFileViewProvider {
  29   private Set<Language> myRelevantLanguages = null;
  30   private final XMLLanguage myLanguage;
  31
  32   public XmlFileViewProvider(final PsiManager manager, final VirtualFile virtualFile, final boolean physical, XMLLanguage language) {
  33     super(manager, virtualFile, physical, language);
  34     myLanguage = language;
  35     assert !(myLanguage instanceof TemplateLanguage);
  36   }
  37
  38   public void contentsSynchronized() {
  39     super.contentsSynchronized();
  40     myRelevantLanguages = null;
  41   }
  42
  43   @NotNull
  44   public Set<Language> getLanguages() {
  45     if (myRelevantLanguages != null) return myRelevantLanguages;
  46     List<Language> relevantLanguages = new ArrayList<Language>(1);
  47     relevantLanguages.add(myLanguage);
  48     relevantLanguages.addAll(Arrays.asList(myLanguage.getLanguageExtensionsForFile(getPsi(myLanguage))));
  49     return myRelevantLanguages = new LinkedHashSet<Language>(relevantLanguages);
  50   }
  51
  52   // Specifically override super implementation method in order to prevent SOE when this class's getRelevantLanguages() is invoked before
  53   // getting psi for myLanguage (see also super.isRelevantLanguage as well)
  54   protected boolean isRelevantLanguage(final Language lang) {
  55     return myLanguage == lang || super.isRelevantLanguage(lang);
  56   }
  57
  58   @NotNull
  59   public LanguageFilter[] getLanguageExtensions() {
  60     return myLanguage.getLanguageExtensions();
  61   }
  62
  63   protected XmlFileViewProvider cloneInner(final VirtualFile copy) {
  64     return new XmlFileViewProvider(getManager(), copy, false, myLanguage);
  65   }
  66 }