java/idea-ui/src/com/intellij/util/descriptors/impl/ConfigFileImpl.java

   1 /*
   2  * Copyright (c) 2007, Your Corporation. All Rights Reserved.
   3  */
   4
   5 package com.intellij.util.descriptors.impl;
   6
   7 import com.intellij.openapi.project.Project;
   8 import com.intellij.openapi.util.Disposer;
   9 import com.intellij.openapi.vfs.VirtualFile;
  10 import com.intellij.openapi.vfs.pointers.VirtualFilePointer;
  11 import com.intellij.openapi.vfs.pointers.VirtualFilePointerListener;
  12 import com.intellij.openapi.vfs.pointers.VirtualFilePointerManager;
  13 import com.intellij.psi.PsiFile;
  14 import com.intellij.psi.PsiManager;
  15 import com.intellij.psi.xml.XmlDocument;
  16 import com.intellij.psi.xml.XmlFile;
  17 import com.intellij.util.descriptors.ConfigFile;
  18 import com.intellij.util.descriptors.ConfigFileInfo;
  19 import com.intellij.util.descriptors.ConfigFileMetaData;
  20 import org.jetbrains.annotations.NotNull;
  21 import org.jetbrains.annotations.Nullable;
  22
  23 /**
  24  * @author nik
  25  */
  26 public class ConfigFileImpl implements ConfigFile {
  27   @NotNull private ConfigFileInfo myInfo;
  28   private VirtualFilePointer myFilePointer;
  29   private PsiFile myPsiFile;
  30   private final ConfigFileContainerImpl myContainer;
  31   private final Project myProject;
  32   private long myModificationCount;
  33   private final Object myPsiFileLock = new Object();
  34   private final VirtualFilePointerListener myListener = new VirtualFilePointerListener() {
  35     public void beforeValidityChanged(final VirtualFilePointer[] pointers) {
  36     }
  37
  38     public void validityChanged(final VirtualFilePointer[] pointers) {
  39       synchronized (myPsiFileLock) {
  40         myPsiFile = null;
  41       }
  42       onChange();
  43     }
  44   };
  45
  46   public ConfigFileImpl(@NotNull final ConfigFileContainerImpl container, @NotNull final ConfigFileInfo configuration) {
  47     myContainer = container;
  48     myInfo = configuration;
  49     setUrl(configuration.getUrl());
  50     Disposer.register(container, this);
  51     myProject = myContainer.getProject();
  52   }
  53
  54   private void setUrl(String url) {
  55     final VirtualFilePointerManager pointerManager = VirtualFilePointerManager.getInstance();
  56     myFilePointer = pointerManager.create(url, this, myListener);
  57     onChange();
  58   }
  59
  60   private void onChange() {
  61     myModificationCount++;
  62     myContainer.fireDescriptorChanged(this);
  63   }
  64
  65   public String getUrl() {
  66     return myFilePointer.getUrl();
  67   }
  68
  69   public void setInfo(@NotNull final ConfigFileInfo info) {
  70     myInfo = info;
  71   }
  72
  73   @Nullable
  74   public VirtualFile getVirtualFile() {
  75     return myFilePointer.getFile();
  76   }
  77
  78   @Nullable
  79   public PsiFile getPsiFile() {
  80     PsiFile psiFile;
  81     synchronized (myPsiFileLock) {
  82       psiFile = myPsiFile;
  83     }
  84
  85     if (psiFile != null && psiFile.isValid()) {
  86       return psiFile;
  87     }
  88
  89     VirtualFile virtualFile = getVirtualFile();
  90     if (virtualFile == null || !virtualFile.isValid()) return null;
  91
  92     psiFile = PsiManager.getInstance(myProject).findFile(virtualFile);
  93
  94     synchronized (myPsiFileLock) {
  95       myPsiFile = psiFile;
  96     }
  97
  98     return psiFile;
  99   }
 100
 101   @Nullable
 102   public XmlFile getXmlFile() {
 103     final PsiFile file = getPsiFile();
 104     return file instanceof XmlFile ? (XmlFile)file : null;
 105   }
 106
 107   public void dispose() {
 108   }
 109
 110   @NotNull
 111   public ConfigFileInfo getInfo() {
 112     return myInfo;
 113   }
 114
 115   public boolean isValid() {
 116     final PsiFile psiFile = getPsiFile();
 117     if (psiFile == null || !psiFile.isValid()) {
 118       return false;
 119     }
 120     if (psiFile instanceof XmlFile) {
 121       final XmlDocument document = ((XmlFile)psiFile).getDocument();
 122       return document != null && document.getRootTag() != null;
 123     }
 124     return true;
 125   }
 126
 127
 128   @NotNull
 129   public ConfigFileMetaData getMetaData() {
 130     return myInfo.getMetaData();
 131   }
 132
 133
 134   public long getModificationCount() {
 135     return myModificationCount;
 136   }
 137 }