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/*
* Copyright 2000-2013 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 com.intellij.util.descriptors.impl;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.pointers.VirtualFilePointer;
import com.intellij.openapi.vfs.pointers.VirtualFilePointerListener;
import com.intellij.openapi.vfs.pointers.VirtualFilePointerManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiManager;
import com.intellij.psi.xml.XmlDocument;
import com.intellij.psi.xml.XmlFile;
import com.intellij.util.descriptors.ConfigFile;
import com.intellij.util.descriptors.ConfigFileInfo;
import com.intellij.util.descriptors.ConfigFileMetaData;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
/**
* @author nik
*/
public class ConfigFileImpl implements ConfigFile {
@NotNull private ConfigFileInfo myInfo;
private final VirtualFilePointer myFilePointer;
private volatile Reference<PsiFile> myPsiFile;
private final ConfigFileContainerImpl myContainer;
private final Project myProject;
private long myModificationCount;
public ConfigFileImpl(@NotNull final ConfigFileContainerImpl container, @NotNull final ConfigFileInfo configuration) {
myContainer = container;
myInfo = configuration;
final VirtualFilePointerManager pointerManager = VirtualFilePointerManager.getInstance();
myFilePointer = pointerManager.create(configuration.getUrl(), this, new VirtualFilePointerListener() {
@Override
public void beforeValidityChanged(@NotNull final VirtualFilePointer[] pointers) {
}
@Override
public void validityChanged(@NotNull final VirtualFilePointer[] pointers) {
myPsiFile = null;
onChange();
}
});
onChange();
myProject = myContainer.getProject();
}
private void onChange() {
myModificationCount++;
myContainer.fireDescriptorChanged(this);
}
@Override
public String getUrl() {
return myFilePointer.getUrl();
}
public void setInfo(@NotNull final ConfigFileInfo info) {
myInfo = info;
}
@Override
@Nullable
public VirtualFile getVirtualFile() {
return myFilePointer.isValid() ? myFilePointer.getFile() : null;
}
@Override
@Nullable
public PsiFile getPsiFile() {
PsiFile psiFile = com.intellij.reference.SoftReference.dereference(myPsiFile);
if (psiFile != null && psiFile.isValid()) {
return psiFile;
}
VirtualFile virtualFile = getVirtualFile();
if (virtualFile == null || !virtualFile.isValid()) return null;
psiFile = PsiManager.getInstance(myProject).findFile(virtualFile);
myPsiFile = new SoftReference<PsiFile>(psiFile);
return psiFile;
}
@Override
@Nullable
public XmlFile getXmlFile() {
final PsiFile file = getPsiFile();
return file instanceof XmlFile ? (XmlFile)file : null;
}
@Override
public void dispose() {
}
@Override
@NotNull
public ConfigFileInfo getInfo() {
return myInfo;
}
@Override
public boolean isValid() {
final PsiFile psiFile = getPsiFile();
if (psiFile == null || !psiFile.isValid()) {
return false;
}
if (psiFile instanceof XmlFile) {
final XmlDocument document = ((XmlFile)psiFile).getDocument();
return document != null && document.getRootTag() != null;
}
return true;
}
@Override
@NotNull
public ConfigFileMetaData getMetaData() {
return myInfo.getMetaData();
}
@Override
public long getModificationCount() {
return myModificationCount;
}
}
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