/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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.
*
* CVS $Id: NameIndexer.java 1833 2007-02-27 06:26:31Z yui $
*/
package xbird.storage.indexer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import xbird.storage.DbCollection;
import xbird.storage.DbException;
import xbird.storage.index.*;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* NameIndexer is a basic implementation of the Indexer interface.
* It is used for maintaining element and element@attribute unique
* indexes.
*
* @version CVS $Revision: 192824 $, $Date: 2004-02-08 11:59:39 +0900 $
*/
public final class NameIndexer extends BTree implements Indexer {
private static final Log log = LogFactory.getLog(NameIndexer.class);
private static final IndexMatch[] EmptyMatches = new IndexMatch[0];
private static final String NAME = "name";
private static final String PATTERN = "pattern";
private DbCollection collection;
private SymbolTable symbols;
private String name;
private String pattern;
private boolean wildcard = false;
public NameIndexer() {
super();
}
public void setConfig(Configuration config) {
super.setConfig(config);
try {
name = config.getAttribute(NAME);
pattern = config.getAttribute(PATTERN);
wildcard = pattern.indexOf('*') != -1;
setLocation(name);
} catch (Exception e) {
if (log.isWarnEnabled()) {
log.warn("ignored exception", e);
}
}
}
public String getName() {
return name;
}
public void setLocation(String location) {
setFile(new File(collection.getCollectionRoot(), location + ".idx"));
}
public void setCollection(Collection collection) {
try {
this.collection = collection;
symbols = collection.getSymbols();
} catch (Exception e) {
if (log.isWarnEnabled()) {
log.warn("ignored exception", e);
}
}
}
public String getIndexStyle() {
return STYLE_NODENAME;
}
public String getPattern() {
return pattern;
}
public void remove(String value, Key key, int pos, int len, short elemID, short attrID) throws DBException {
try {
removeValue(key);
} catch (IOException e) {
throw new BTreeCorruptException("Corruption detected on remove", e);
}
}
public void add(String value, Key key, int pos, int len, short elemID, short attrID) throws DBException {
try {
addValue(key, 0);
} catch (IOException e) {
throw new BTreeCorruptException("Corruption detected on add", e);
}
}
public void flush() throws DbException {
super.flush();
}
public IndexMatch[] matches(final IndexQuery query) throws DbException {
final List results = new ArrayList();
final IndexPattern pattern = query.getPattern();
try {
search(query, new BTreeCallback() {
public boolean indexInfo(Value value, long pos) {
results.add(new IndexMatch(new Key(value), pattern));
return true;
}
});
} catch (DbException e) {
throw e;
} catch (Exception e) {
if (log.isWarnEnabled()) {
log.warn("ignored exception", e);
}
}
return (IndexMatch[]) results.toArray(EmptyMatches);
}
}