| /* |
| * 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. |
| */ |
| package com.intellij.compiler.impl; |
| |
| import com.intellij.util.io.DataExternalizer; |
| import com.intellij.util.io.EnumeratorStringDescriptor; |
| import com.intellij.util.io.PersistentHashMap; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| public abstract class StateCache<T> { |
| private PersistentHashMap<String, T> myMap; |
| private final File myBaseFile; |
| |
| public StateCache(@NonNls File storePath) throws IOException { |
| myBaseFile = storePath; |
| myMap = createMap(storePath); |
| } |
| |
| protected abstract T read(DataInput stream) throws IOException; |
| |
| protected abstract void write(T t, DataOutput out) throws IOException; |
| |
| public void force() { |
| myMap.force(); |
| } |
| |
| public void close() throws IOException { |
| myMap.close(); |
| } |
| |
| public boolean wipe() { |
| try { |
| myMap.close(); |
| } |
| catch (IOException ignored) { |
| } |
| PersistentHashMap.deleteFilesStartingWith(myBaseFile); |
| try { |
| myMap = createMap(myBaseFile); |
| } |
| catch (IOException ignored) { |
| return false; |
| } |
| return true; |
| } |
| |
| public void update(@NonNls String url, T state) throws IOException { |
| if (state != null) { |
| myMap.put(url, state); |
| } |
| else { |
| remove(url); |
| } |
| } |
| |
| public void remove(String url) throws IOException { |
| myMap.remove(url); |
| } |
| |
| public T getState(String url) throws IOException { |
| return myMap.get(url); |
| } |
| |
| public Collection<String> getUrls() throws IOException { |
| return myMap.getAllKeysWithExistingMapping(); |
| } |
| |
| public Iterator<String> getUrlsIterator() throws IOException { |
| return myMap.getAllKeysWithExistingMapping().iterator(); |
| } |
| |
| |
| private PersistentHashMap<String, T> createMap(final File file) throws IOException { |
| return new PersistentHashMap<String,T>(file, new EnumeratorStringDescriptor(), new DataExternalizer<T>() { |
| public void save(@NotNull final DataOutput out, final T value) throws IOException { |
| StateCache.this.write(value, out); |
| } |
| |
| public T read(@NotNull final DataInput in) throws IOException { |
| return StateCache.this.read(in); |
| } |
| }); |
| } |
| |
| } |