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/*
* Copyright 2000-2009 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.openapi.util;
import com.intellij.util.concurrency.AtomicFieldUpdater;
import com.intellij.util.keyFMap.KeyFMap;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.TestOnly;
public class UserDataHolderBase implements UserDataHolderEx, Cloneable {
public static final Key<KeyFMap> COPYABLE_USER_MAP_KEY = Key.create("COPYABLE_USER_MAP_KEY");
/**
* Concurrent writes to this field are via CASes only, using the {@link #updater}
*/
@NotNull private volatile KeyFMap myUserMap = KeyFMap.EMPTY_MAP;
@Override
protected Object clone() {
try {
UserDataHolderBase clone = (UserDataHolderBase)super.clone();
clone.setUserMap(KeyFMap.EMPTY_MAP);
copyCopyableDataTo(clone);
return clone;
}
catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
@TestOnly
public String getUserDataString() {
final KeyFMap userMap = getUserMap();
final KeyFMap copyableMap = getUserData(COPYABLE_USER_MAP_KEY);
return userMap.toString() + (copyableMap == null ? "" : copyableMap.toString());
}
public void copyUserDataTo(UserDataHolderBase other) {
other.setUserMap(getUserMap());
}
@Override
public <T> T getUserData(@NotNull Key<T> key) {
//noinspection unchecked
return getUserMap().get(key);
}
@NotNull
protected KeyFMap getUserMap() {
return myUserMap;
}
@Override
public <T> void putUserData(@NotNull Key<T> key, @Nullable T value) {
while (true) {
KeyFMap map = getUserMap();
KeyFMap newMap = value == null ? map.minus(key) : map.plus(key, value);
if (newMap == map || changeUserMap(map, newMap)) {
break;
}
}
}
protected boolean changeUserMap(KeyFMap oldMap, KeyFMap newMap) {
return updater.compareAndSet(this, oldMap, newMap);
}
public <T> T getCopyableUserData(Key<T> key) {
KeyFMap map = getUserData(COPYABLE_USER_MAP_KEY);
//noinspection unchecked,ConstantConditions
return map == null ? null : map.get(key);
}
public <T> void putCopyableUserData(Key<T> key, T value) {
while (true) {
KeyFMap map = getUserMap();
KeyFMap copyableMap = map.get(COPYABLE_USER_MAP_KEY);
if (copyableMap == null) {
copyableMap = KeyFMap.EMPTY_MAP;
}
KeyFMap newCopyableMap = value == null ? copyableMap.minus(key) : copyableMap.plus(key, value);
KeyFMap newMap = newCopyableMap.isEmpty() ? map.minus(COPYABLE_USER_MAP_KEY) : map.plus(COPYABLE_USER_MAP_KEY, newCopyableMap);
if (newMap == map || changeUserMap(map, newMap)) {
return;
}
}
}
@Override
public <T> boolean replace(@NotNull Key<T> key, @Nullable T oldValue, @Nullable T newValue) {
while (true) {
KeyFMap map = getUserMap();
if (map.get(key) != oldValue) {
return false;
}
KeyFMap newMap = newValue == null ? map.minus(key) : map.plus(key, newValue);
if (newMap == map || changeUserMap(map, newMap)) {
return true;
}
}
}
@Override
@NotNull
public <T> T putUserDataIfAbsent(@NotNull final Key<T> key, @NotNull final T value) {
while (true) {
KeyFMap map = getUserMap();
T oldValue = map.get(key);
if (oldValue != null) {
return oldValue;
}
KeyFMap newMap = map.plus(key, value);
if (newMap == map || changeUserMap(map, newMap)) {
return value;
}
}
}
public void copyCopyableDataTo(@NotNull UserDataHolderBase clone) {
clone.putUserData(COPYABLE_USER_MAP_KEY, getUserData(COPYABLE_USER_MAP_KEY));
}
protected void clearUserData() {
setUserMap(KeyFMap.EMPTY_MAP);
}
protected void setUserMap(KeyFMap map) {
myUserMap = map;
}
public boolean isUserDataEmpty() {
return getUserMap().isEmpty();
}
private static final AtomicFieldUpdater<UserDataHolderBase, KeyFMap> updater = AtomicFieldUpdater.forFieldOfType(UserDataHolderBase.class, KeyFMap.class);
}
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