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/*
* Copyright 2000-2013 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.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.File;
import java.io.IOException;
public class PersistentStringEnumerator extends PersistentEnumeratorDelegate<String> implements AbstractStringEnumerator {
@Nullable private final CachingEnumerator<String> myCache;
public PersistentStringEnumerator(@NotNull final File file) throws IOException {
this(file, null);
}
public PersistentStringEnumerator(@NotNull final File file, @Nullable PagedFileStorage.StorageLockContext storageLockContext) throws IOException {
this(file, 1024 * 4, storageLockContext);
}
public PersistentStringEnumerator(@NotNull final File file, boolean cacheLastMappings) throws IOException {
this(file, 1024 * 4, cacheLastMappings, null);
}
public PersistentStringEnumerator(@NotNull final File file, final int initialSize) throws IOException {
this(file, initialSize, null);
}
public PersistentStringEnumerator(@NotNull final File file,
final int initialSize,
@Nullable PagedFileStorage.StorageLockContext lockContext) throws IOException {
this(file, initialSize, false, lockContext);
}
private PersistentStringEnumerator(@NotNull final File file,
final int initialSize,
boolean cacheLastMappings,
@Nullable PagedFileStorage.StorageLockContext lockContext) throws IOException {
super(file, EnumeratorStringDescriptor.INSTANCE, initialSize, lockContext);
myCache = cacheLastMappings ? new CachingEnumerator<String>(new DataEnumerator<String>() {
@Override
public int enumerate(@Nullable String value) throws IOException {
return PersistentStringEnumerator.super.enumerate(value);
}
@Nullable
@Override
public String valueOf(int idx) throws IOException {
return PersistentStringEnumerator.super.valueOf(idx);
}
}, EnumeratorStringDescriptor.INSTANCE) : null;
}
@Override
public int enumerate(@Nullable String value) throws IOException {
return myCache != null ? myCache.enumerate(value) : super.enumerate(value);
}
@Nullable
@Override
public String valueOf(int idx) throws IOException {
return myCache != null ? myCache.valueOf(idx) : super.valueOf(idx);
}
@Override
public void close() throws IOException {
super.close();
if (myCache != null) myCache.close();
}
@Override
public void markCorrupted() {
myEnumerator.markCorrupted();
}
}
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