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Declarative Machine Learning
/*
* 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.sysml.utils;
import static org.junit.Assert.fail;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.sysml.runtime.io.IOUtilFunctions;
/**
* Class to help setting variables in a script.
*/
public class ParameterBuilder
{
/** String used to replace variables in scripts */
private static String _RS = "\\$\\$";
/**
*
* Replaces variables in a DML or R script with the specified values. A
* variable of format $$name$$ will be replaced where the name is used to
* identify the variable in the hashmap containing the belonging value.
*
*
* @param strScriptPathName
* filename of the DML script
* @param variables
* hashmap containing all the variables and their replacements
*/
public static void setVariablesInScript(String strScriptPathName, HashMap variables) {
try {
String strScript = strScriptPathName;
String strTmpScript = strScript + "t";
BufferedReader in = null;
PrintWriter pw = null;
try {
in = new BufferedReader(new InputStreamReader(new FileInputStream(strScript)));
pw = new PrintWriter(new FileOutputStream(strTmpScript));
String content;
Pattern unresolvedVars = Pattern.compile(_RS + ".*" + _RS);
/*
* so that variables, which were not assigned, are replaced by an
* empty string
*/
while ((content = in.readLine()) != null) {
for (Entry e : variables.entrySet() ) {
String variable = e.getKey();
String val = e.getValue();
Pattern pattern = Pattern.compile(_RS + variable + _RS);
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
content = content.replaceFirst(matcher.group().replace("$", "\\$"), val);
}
}
Matcher matcher = unresolvedVars.matcher(content);
content = matcher.replaceAll("");
pw.println(content);
}
}
finally {
IOUtilFunctions.closeSilently(pw);
IOUtilFunctions.closeSilently(in);
}
}
catch (IOException e) {
fail("unable to set variables in dml script: " + e.getMessage());
}
}
/**
*
* Replaces variables in a DML or R script with the specified values. A
* variable of format $$name$$ will be replaced where the name is used to
* identify the variable in the hashmap containing the belonging value.
*
*
* @param strScriptDirectory
* directory which contains the DML script
* @param strScriptFile
* filename of the DML script
* @param variables
* hashmap containing all the variables and their replacements
*/
public static void setVariablesInScript(String strScriptDirectory, String strScriptFile,
HashMap variables) {
String strScript = strScriptDirectory + strScriptFile;
setVariablesInScript(strScript, variables);
}
}