/*
* RapidMiner
*
* Copyright (C) 2001-2011 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.io;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import com.rapidminer.RapidMiner;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.UserError;
import com.rapidminer.parameter.ParameterType;
import com.rapidminer.parameter.ParameterTypeFile;
import com.rapidminer.tools.io.Encoding;
/**
* Writes all attributes of an example set to a file. Each line holds the
* construction description of one attribute. This file can be read in another
* process using the
* {@link com.rapidminer.operator.features.construction.FeatureGenerationOperator} or
* {@link AttributeConstructionsLoader}.
*
* @author Ingo Mierswa
*/
public class AttributeConstructionsWriter extends AbstractWriter<ExampleSet> {
/** The parameter name for "Filename for the attribute construction description file." */
public static final String PARAMETER_ATTRIBUTE_CONSTRUCTIONS_FILE = "attribute_constructions_file";
public AttributeConstructionsWriter(OperatorDescription description) {
super(description, ExampleSet.class);
}
/** Writes the attribute set to a file. */
@Override
public ExampleSet write(ExampleSet eSet) throws OperatorException {
File generatorFile = getParameterAsFile(PARAMETER_ATTRIBUTE_CONSTRUCTIONS_FILE, true);
PrintWriter out = null;
try {
out = new PrintWriter(new FileWriter(generatorFile));
out.println("<?xml version=\"1.0\" encoding=\"" + Encoding.getEncoding(this) + "\"?>");
out.println("<constructions version=\"" + RapidMiner.getShortVersion() + "\">");
for (Attribute attribute : eSet.getAttributes()) {
out.println(" <attribute name=\"" + attribute.getName() + "\" construction=\"" + attribute.getConstruction() + "\"/>");
}
out.println("</constructions>");
} catch (IOException e) {
throw new UserError(this, e, 303, new Object[] { generatorFile, e.getMessage() });
} finally {
if (out != null)
out.close();
}
return eSet;
}
@Override
public List<ParameterType> getParameterTypes() {
List<ParameterType> types = super.getParameterTypes();
types.add(new ParameterTypeFile(PARAMETER_ATTRIBUTE_CONSTRUCTIONS_FILE, "Filename for the attribute construction description file.", "att", false, false));
types.addAll(Encoding.getParameterTypes(this));
return types;
}
}