source/com/intellij/util/xml/impl/DomFileElementImpl.java

   1 /*
   2  * Copyright (c) 2005 Your Corporation. All Rights Reserved.
   3  */
   4 package com.intellij.util.xml.impl;
   5
   6 import com.intellij.psi.PsiLock;
   7 import com.intellij.psi.xml.XmlDocument;
   8 import com.intellij.psi.xml.XmlFile;
   9 import com.intellij.psi.xml.XmlTag;
  10 import com.intellij.util.xml.*;
  11 import org.jetbrains.annotations.NotNull;
  12 import org.jetbrains.annotations.Nullable;
  13
  14 /**
  15  * @author peter
  16  */
  17 public class DomFileElementImpl<T extends DomElement> implements DomFileElement<T> {
  18   private final XmlFile myFile;
  19   private final Class<T> myRootElementClass;
  20   private final String myRootTagName;
  21   private final DomManagerImpl myManager;
  22   private T myRootValue;
  23
  24   protected DomFileElementImpl(final XmlFile file,
  25                                final Class<T> rootElementClass,
  26                                final String rootTagName,
  27                                final DomManagerImpl manager) {
  28     myFile = file;
  29     myRootElementClass = rootElementClass;
  30     myRootTagName = rootTagName;
  31     myManager = manager;
  32   }
  33
  34   public XmlFile getFile() {
  35     return myFile;
  36   }
  37
  38   @Nullable
  39   public XmlTag getRootTag() {
  40     final XmlDocument document = myFile.getDocument();
  41     if (document != null) {
  42       final XmlTag tag = document.getRootTag();
  43       if (tag != null && myRootTagName.equals(tag.getName())) {
  44         return tag;
  45       }
  46     }
  47     return null;
  48   }
  49
  50   public DomManagerImpl getManager() {
  51     return myManager;
  52   }
  53
  54   @NotNull
  55   public T getRootElement() {
  56     synchronized (PsiLock.LOCK) {
  57       if (myRootValue == null) {
  58         final XmlTag tag = getRootTag();
  59         final DomRootInvocationHandler<T> handler = new DomRootInvocationHandler<T>(myRootElementClass, tag, this, myRootTagName);
  60         myRootValue = (T)myManager.createDomElement(myRootElementClass, tag, handler);
  61       }
  62       return myRootValue;
  63     }
  64   }
  65
  66   void invalidateRoot() {
  67     synchronized (PsiLock.LOCK) {
  68       myRootValue = null;
  69     }
  70   }
  71
  72   public String toString() {
  73     return "File " + myFile.toString();
  74   }
  75
  76   public XmlTag getXmlTag() {
  77     return null;
  78   }
  79
  80   @NotNull
  81   public DomFileElementImpl getRoot() {
  82     return this;
  83   }
  84
  85   public DomElement getParent() {
  86     return null;
  87   }
  88
  89   public XmlTag ensureTagExists() {
  90     return null;
  91   }
  92
  93   public void undefine() {
  94   }
  95
  96   public boolean isValid() {
  97     return true;
  98   }
  99
 100   public MethodsMap getMethodsMap() {
 101     return null;
 102   }
 103 }