/**
* 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.tika.language.translate;
import org.apache.tika.language.LanguageIdentifier;
import org.apache.tika.language.LanguageProfile;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.Locale;
/**
* Abstract class used to interact with command line/external Translators.
*
* @see org.apache.tika.language.translate.MosesTranslator for an example of extending this class.
*
* @since Tika 1.7
*/
public abstract class ExternalTranslator implements Translator {
/**
* Run the given command and return the output written to standard out.
*
* @param command The complete command to run.
* @param env The environment to pass along to the Runtime.
* @param workingDirectory The directory from which to run the command.
* @return The output of the command written to standard out.
* @throws IOException
* @throws InterruptedException
*/
public Reader runAndGetOutput(String command, String[] env, File workingDirectory) throws IOException, InterruptedException {
Process process = Runtime.getRuntime().exec(command, env, workingDirectory);
InputStreamReader reader = new InputStreamReader(process.getInputStream(), Charset.defaultCharset());
BufferedReader bufferedReader = new BufferedReader(reader);
process.waitFor();
return bufferedReader;
}
/**
* Checks to see if the command can be run. Typically used with
* something like "myapp --version" to check to see if "myapp"
* is installed and on the path.
*
* @param checkCommandString The command to run and check the return code of.
* @param successCodes Return codes that signify success.
*/
public boolean checkCommand(String checkCommandString, int... successCodes) {
try {
Process process = Runtime.getRuntime().exec(checkCommandString);
process.waitFor();
int result = process.waitFor();
for (int code : successCodes) {
if (code == result) return true;
}
return false;
} catch(IOException e) {
// Some problem, command is there or is broken
System.err.println("Broken pipe");
return false;
} catch (InterruptedException ie) {
// Some problem, command is there or is broken
System.err.println("Interrupted");
return false;
}
}
/**
* Default translate method which uses built Tika language identification.
* @param text The text to translate.
* @param targetLanguage The desired language to translate to (for example, "hi").
* @return The translated text.
* @throws Exception
*/
@Override
public String translate(String text, String targetLanguage) throws Exception {
LanguageIdentifier language = new LanguageIdentifier(
new LanguageProfile(text));
String sourceLanguage = language.getLanguage();
return translate(text, sourceLanguage, targetLanguage);
}
}