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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.
*/
/*
* @author max
*/
package com.intellij.find.ngrams;
import com.intellij.openapi.util.text.TrigramBuilder;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.indexing.*;
import com.intellij.util.io.EnumeratorIntegerDescriptor;
import com.intellij.util.io.KeyDescriptor;
import gnu.trove.THashMap;
import gnu.trove.TIntHashSet;
import gnu.trove.TIntProcedure;
import org.jetbrains.annotations.NotNull;
import java.util.Map;
public class TrigramIndex extends ScalarIndexExtension<Integer> {
public static final boolean ENABLED = "true".equals(System.getProperty("idea.internal.trigramindex.enabled"));
public static final ID<Integer,Void> INDEX_ID = ID.create("Trigram.Index");
private static final FileBasedIndex.InputFilter INPUT_FILTER = new FileBasedIndex.InputFilter() {
@Override
public boolean acceptInput(VirtualFile file) {
return !file.getFileType().isBinary();
}
};
private static final FileBasedIndex.InputFilter NO_FILES = new FileBasedIndex.InputFilter() {
@Override
public boolean acceptInput(VirtualFile file) {
return false;
}
};
@NotNull
@Override
public ID<Integer, Void> getName() {
return INDEX_ID;
}
@NotNull
@Override
public DataIndexer<Integer, Void, FileContent> getIndexer() {
return new DataIndexer<Integer, Void, FileContent>() {
@Override
@NotNull
public Map<Integer, Void> map(FileContent inputData) {
final Map<Integer, Void> result = new THashMap<Integer, Void>();
TIntHashSet built = TrigramBuilder.buildTrigram(inputData.getContentAsText());
built.forEach(new TIntProcedure() {
@Override
public boolean execute(int value) {
result.put(value, null);
return true;
}
});
return result;
}
};
}
@Override
public KeyDescriptor<Integer> getKeyDescriptor() {
return EnumeratorIntegerDescriptor.INSTANCE;
}
@Override
public FileBasedIndex.InputFilter getInputFilter() {
if (ENABLED) {
return INPUT_FILTER;
}
else {
return NO_FILES;
}
}
@Override
public boolean dependsOnFileContent() {
return true;
}
@Override
public int getVersion() {
return ENABLED ? 2 : 1;
}
}
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