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/*
* Copyright 2000-2014 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.
*/
/*
* @author max
*/
package com.intellij.openapi.vfs.newvfs;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.io.DataInputOutputUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
public class FileAttribute {
private static final Set<String> ourRegisteredIds = new HashSet<String>();
private final String myId;
private final int myVersion;
private final boolean myFixedSize;
/**
* @deprecated
* @see #FileAttribute(String, int, boolean)
*/
public FileAttribute(@NonNls @NotNull String id, int version) {
this(id, version, false);
}
public FileAttribute(@NonNls @NotNull String id, int version, boolean fixedSize) {
this(version, fixedSize, id);
boolean added = ourRegisteredIds.add(id);
assert added : "Attribute id='" + id+ "' is not unique";
}
private FileAttribute(int version, boolean fixedSize,@NotNull String id) {
myId = id;
myVersion = version;
myFixedSize = fixedSize;
}
@Nullable
public DataInputStream readAttribute(@NotNull VirtualFile file) {
DataInputStream stream = ManagingFS.getInstance().readAttribute(file, this);
if (stream != null) {
try {
int actualVersion = DataInputOutputUtil.readINT(stream);
if (actualVersion != myVersion) {
stream.close();
return null;
}
}
catch (IOException e) {
return null;
}
}
return stream;
}
@NotNull
public DataOutputStream writeAttribute(@NotNull VirtualFile file) {
final DataOutputStream stream = ManagingFS.getInstance().writeAttribute(file, this);
try {
DataInputOutputUtil.writeINT(stream, myVersion);
}
catch (IOException e) {
throw new RuntimeException(e);
}
return stream;
}
@Nullable
public byte[] readAttributeBytes(VirtualFile file) throws IOException {
final DataInputStream stream = readAttribute(file);
if (stream == null) return null;
try {
int len = stream.readInt();
return FileUtil.loadBytes(stream, len);
}
finally {
stream.close();
}
}
public void writeAttributeBytes(VirtualFile file, @NotNull byte[] bytes) throws IOException {
writeAttributeBytes(file, bytes, 0, bytes.length);
}
public void writeAttributeBytes(VirtualFile file, byte[] bytes, int offset, int len) throws IOException {
final DataOutputStream stream = writeAttribute(file);
try {
stream.writeInt(len);
stream.write(bytes, offset, len);
}
finally {
stream.close();
}
}
@NotNull
public String getId() {
return myId;
}
public boolean isFixedSize() {
return myFixedSize;
}
@NotNull
public FileAttribute newVersion(int newVersion) {
return new FileAttribute(newVersion, myFixedSize, myId);
}
}
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