package org.apache.lucene.collation;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.*;
import org.apache.lucene.collation.ICUCollationKeyFilter;
import org.apache.lucene.util.IOUtils;
import com.ibm.icu.text.Collator;
import com.ibm.icu.text.RuleBasedCollator;
import com.ibm.icu.util.ULocale;
/**
* <!-- see LUCENE-4015 for why we cannot link -->
* Factory for <code>ICUCollationKeyFilter</code>.
* <p>
* This factory can be created in two ways:
* <ul>
* <li>Based upon a system collator associated with a Locale.
* <li>Based upon a tailored ruleset.
* </ul>
* <p>
* Using a System collator:
* <ul>
* <li>locale: RFC 3066 locale ID (mandatory)
* <li>strength: 'primary','secondary','tertiary', 'quaternary', or 'identical' (optional)
* <li>decomposition: 'no', or 'canonical' (optional)
* </ul>
* <p>
* Using a Tailored ruleset:
* <ul>
* <li>custom: UTF-8 text file containing rules supported by RuleBasedCollator (mandatory)
* <li>strength: 'primary','secondary','tertiary', 'quaternary', or 'identical' (optional)
* <li>decomposition: 'no' or 'canonical' (optional)
* </ul>
* <p>
* Expert options:
* <ul>
* <li>alternate: 'shifted' or 'non-ignorable'. Can be used to ignore punctuation/whitespace.
* <li>caseLevel: 'true' or 'false'. Useful with strength=primary to ignore accents but not case.
* <li>caseFirst: 'lower' or 'upper'. Useful to control which is sorted first when case is not ignored.
* <li>numeric: 'true' or 'false'. Digits are sorted according to numeric value, e.g. foobar-9 sorts before foobar-10
* <li>variableTop: single character or contraction. Controls what is variable for 'alternate'
* </ul>
*
* @see Collator
* @see ULocale
* @see RuleBasedCollator
* @deprecated use {@link ICUCollationKeyAnalyzer} instead.
*/
@Deprecated
public class ICUCollationKeyFilterFactory extends TokenFilterFactory implements MultiTermAwareComponent, ResourceLoaderAware {
private Collator collator;
public void inform(ResourceLoader loader) throws IOException {
String custom = args.get("custom");
String localeID = args.get("locale");
String strength = args.get("strength");
String decomposition = args.get("decomposition");
String alternate = args.get("alternate");
String caseLevel = args.get("caseLevel");
String caseFirst = args.get("caseFirst");
String numeric = args.get("numeric");
String variableTop = args.get("variableTop");
if (custom == null && localeID == null)
throw new IllegalArgumentException("Either custom or locale is required.");
if (custom != null && localeID != null)
throw new IllegalArgumentException("Cannot specify both locale and custom. "
+ "To tailor rules for a built-in language, see the javadocs for RuleBasedCollator. "
+ "Then save the entire customized ruleset to a file, and use with the custom parameter");
if (localeID != null) {
// create from a system collator, based on Locale.
collator = createFromLocale(localeID);
} else {
// create from a custom ruleset
collator = createFromRules(custom, loader);
}
// set the strength flag, otherwise it will be the default.
if (strength != null) {
if (strength.equalsIgnoreCase("primary"))
collator.setStrength(Collator.PRIMARY);
else if (strength.equalsIgnoreCase("secondary"))
collator.setStrength(Collator.SECONDARY);
else if (strength.equalsIgnoreCase("tertiary"))
collator.setStrength(Collator.TERTIARY);
else if (strength.equalsIgnoreCase("quaternary"))
collator.setStrength(Collator.QUATERNARY);
else if (strength.equalsIgnoreCase("identical"))
collator.setStrength(Collator.IDENTICAL);
else
throw new IllegalArgumentException("Invalid strength: " + strength);
}
// set the decomposition flag, otherwise it will be the default.
if (decomposition != null) {
if (decomposition.equalsIgnoreCase("no"))
collator.setDecomposition(Collator.NO_DECOMPOSITION);
else if (decomposition.equalsIgnoreCase("canonical"))
collator.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
else
throw new IllegalArgumentException("Invalid decomposition: " + decomposition);
}
// expert options: concrete subclasses are always a RuleBasedCollator
RuleBasedCollator rbc = (RuleBasedCollator) collator;
if (alternate != null) {
if (alternate.equalsIgnoreCase("shifted")) {
rbc.setAlternateHandlingShifted(true);
} else if (alternate.equalsIgnoreCase("non-ignorable")) {
rbc.setAlternateHandlingShifted(false);
} else {
throw new IllegalArgumentException("Invalid alternate: " + alternate);
}
}
if (caseLevel != null) {
rbc.setCaseLevel(Boolean.parseBoolean(caseLevel));
}
if (caseFirst != null) {
if (caseFirst.equalsIgnoreCase("lower")) {
rbc.setLowerCaseFirst(true);
} else if (caseFirst.equalsIgnoreCase("upper")) {
rbc.setUpperCaseFirst(true);
} else {
throw new IllegalArgumentException("Invalid caseFirst: " + caseFirst);
}
}
if (numeric != null) {
rbc.setNumericCollation(Boolean.parseBoolean(numeric));
}
if (variableTop != null) {
rbc.setVariableTop(variableTop);
}
}
public TokenStream create(TokenStream input) {
return new ICUCollationKeyFilter(input, collator);
}
/*
* Create a locale from localeID.
* Then return the appropriate collator for the locale.
*/
private Collator createFromLocale(String localeID) {
return Collator.getInstance(new ULocale(localeID));
}
/*
* Read custom rules from a file, and create a RuleBasedCollator
* The file cannot support comments, as # might be in the rules!
*/
private Collator createFromRules(String fileName, ResourceLoader loader) {
InputStream input = null;
try {
input = loader.openResource(fileName);
String rules = toUTF8String(input);
return new RuleBasedCollator(rules);
} catch (Exception e) {
// io error or invalid rules
throw new RuntimeException(e);
} finally {
IOUtils.closeWhileHandlingException(input);
}
}
@Override
public AbstractAnalysisFactory getMultiTermComponent() {
return this;
}
private String toUTF8String(InputStream in) throws IOException {
StringBuilder sb = new StringBuilder();
char buffer[] = new char[1024];
Reader r = IOUtils.getDecodingReader(in, IOUtils.CHARSET_UTF_8);
int len = 0;
while ((len = r.read(buffer)) > 0) {
sb.append(buffer, 0, len);
}
return sb.toString();
}
}