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/*
* 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.indexing;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.UserDataHolderEx;
import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
import java.util.List;
/**
* @author Dmitry Avdeev
* @author peter
*/
public class PerIndexDocumentVersionMap {
private volatile int mapVersion;
private static class IdVersionInfo {
private final ID<?,?> id;
private int mapVersion;
private long docVersion;
private IdVersionInfo(@NotNull ID<?, ?> id, long docVersion, int mapVersion) {
this.docVersion = docVersion;
this.mapVersion = mapVersion;
this.id = id;
}
}
private static final Key<List<IdVersionInfo>> KEY = Key.create("UnsavedDocIdVersionInfo");
public long getAndSet(@NotNull Document document, @NotNull ID<?, ?> indexId, long value) {
List<IdVersionInfo> list = document.getUserData(KEY);
if (list == null) {
list = ((UserDataHolderEx)document).putUserDataIfAbsent(KEY, new ArrayList<IdVersionInfo>());
}
synchronized (list) {
for (IdVersionInfo info : list) {
if (info.id == indexId) {
long old = info.docVersion;
if (info.mapVersion != mapVersion) {
old = 0;
info.mapVersion = mapVersion;
}
info.docVersion = value;
return old;
}
}
list.add(new IdVersionInfo(indexId, value, mapVersion));
return 0;
}
}
public void clear() {
mapVersion++;
}
}
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