| /* |
| * Copyright 2000-2011 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.io; |
| |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| public abstract class ByteBufferWrapper { |
| protected final File myFile; |
| protected final long myPosition; |
| protected final long myLength; |
| protected volatile boolean myDirty; |
| |
| protected ByteBufferWrapper(final File file, final long offset, final long length) { |
| myFile = file; |
| myPosition = offset; |
| myLength = length; |
| } |
| |
| @Nullable |
| public abstract ByteBuffer getCachedBuffer(); |
| |
| public final void markDirty() { |
| if (!myDirty) myDirty = true; |
| } |
| |
| public final boolean isDirty() { |
| return myDirty; |
| } |
| |
| public abstract ByteBuffer getBuffer() throws IOException; |
| |
| public abstract void unmap(); |
| |
| public abstract void flush(); |
| |
| public void dispose() { |
| unmap(); |
| } |
| |
| public static ByteBufferWrapper readWrite(final File file, final int offset, final int length) { |
| return new ReadWriteDirectBufferWrapper(file, offset, length); |
| } |
| |
| public static ByteBufferWrapper readWriteDirect(final File file, final long offset, final int length) { |
| return new ReadWriteDirectBufferWrapper(file, offset, length); |
| } |
| |
| public static ByteBufferWrapper readOnly(final File file, final int offset) { |
| return new ReadOnlyMappedBufferWrapper(file, offset); |
| } |
| |
| @Override |
| public String toString() { |
| return "Buffer for " + myFile + " size: " + myLength; |
| } |
| } |