org.apache.lucene.analysis.cn.smart.AnalyzerProfile Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.lucene.analysis.cn.smart;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Properties;
/**
* Manages analysis data configuration for SmartChineseAnalyzer
*
* SmartChineseAnalyzer has a built-in dictionary and stopword list out-of-box.
*
* @lucene.experimental
*/
public class AnalyzerProfile {
/**
* Global indicating the configured analysis data directory
*/
public static String ANALYSIS_DATA_DIR = "";
static {
init();
}
private static void init() {
String dirName = "analysis-data";
String propName = "analysis.properties";
// Try the system property：-Danalysis.data.dir=/path/to/analysis-data
ANALYSIS_DATA_DIR = System.getProperty("analysis.data.dir", "");
if (ANALYSIS_DATA_DIR.length() != 0)
return;
Path[] candidateFiles = new Path[] {
Paths.get(dirName),
Paths.get("lib").resolve(dirName),
Paths.get(propName),
Paths.get("lib").resolve(propName)
};
for (Path file : candidateFiles) {
if (Files.exists(file)) {
if (Files.isDirectory(file)) {
ANALYSIS_DATA_DIR = file.toAbsolutePath().toString();
} else if (Files.isRegularFile(file) && getAnalysisDataDir(file).length() != 0) {
ANALYSIS_DATA_DIR = getAnalysisDataDir(file).toString();
}
break;
}
}
if (ANALYSIS_DATA_DIR.length() == 0) {
// Dictionary directory cannot be found.
throw new RuntimeException("WARNING: Can not find lexical dictionary directory!"
+ " This will cause unpredictable exceptions in your application!"
+ " Please refer to the manual to download the dictionaries.");
}
}
private static String getAnalysisDataDir(Path propFile) {
Properties prop = new Properties();
try (BufferedReader reader = Files.newBufferedReader(propFile, StandardCharsets.UTF_8)) {
prop.load(reader);
return prop.getProperty("analysis.data.dir", "");
} catch (IOException e) {
return "";
}
}
}