/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.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;
import com.rapidminer.operator.meta.FeatureIterator;
import com.rapidminer.operator.ports.DummyPortPairExtender;
import com.rapidminer.operator.ports.PortPairExtender;
import com.rapidminer.parameter.ParameterType;
import com.rapidminer.parameter.ParameterTypeList;
import com.rapidminer.parameter.ParameterTypeString;
import java.util.Iterator;
import java.util.List;
/**
* <p>
* (Re-)Define macros for the current process. Macros will be replaced in the value strings of
* parameters by the macro values defined in the parameter list of this operator.
* </p>
*
* <p>
* In the parameter list of this operator, you have to define the macro name (without the enclosing
* brackets) and the macro value. The defined macro can then be used in all succeeding operators as
* parameter value for string type parameters. A macro must then be enclosed by
* "MACRO_START" and "MACRO_END".
* </p>
*
* <p>
* There are several predefined macros:
* </p>
* <ul>
* <li>MACRO_STARTprocess_nameMACRO_END: will be replaced by the name of the process (without path
* and extension)</li>
* <li>MACRO_STARTprocess_fileMACRO_END: will be replaced by the file name of the process (with
* extension)</li>
* <li>MACRO_STARTprocess_pathMACRO_END: will be replaced by the complete absolute path of the
* process file</li>
* </ul>
*
* <p>
* In addition to those the user might define arbitrary other macros which will be replaced by
* arbitrary string during the process run. Please note also that several other short macros exist,
* e.g. MACRO_STARTaMACRO_END for the number of times the current operator was applied. Please refer
* to the section about macros in the RapidMiner tutorial. Please note also that other operators
* like the {@link FeatureIterator} also add specific macros.
* </p>
*
* @author Ingo Mierswa
*/
public class MacroDefinitionOperator extends Operator {
/** The parameter name for "The values of the user defined macros." */
public static final String PARAMETER_VALUES = "values";
public static final String PARAMETER_MACROS = "macros";
private PortPairExtender dummyPorts = new DummyPortPairExtender("through", getInputPorts(), getOutputPorts());
public MacroDefinitionOperator(OperatorDescription description) {
super(description);
dummyPorts.start();
getTransformer().addRule(dummyPorts.makePassThroughRule());
}
@Override
public void doWork() throws OperatorException {
List<String[]> macros = getParameterList(PARAMETER_MACROS);
Iterator<String[]> i = macros.iterator();
while (i.hasNext()) {
String[] macroDefinition = i.next();
String macro = macroDefinition[0];
String value = macroDefinition[1];
getProcess().getMacroHandler().addMacro(macro, value);
}
dummyPorts.passDataThrough();
}
@Override
public List<ParameterType> getParameterTypes() {
List<ParameterType> types = super.getParameterTypes();
types.add(new ParameterTypeList(PARAMETER_MACROS, "The list of macros defined by the user.",
new ParameterTypeString("macro_name", "The macro name."), new ParameterTypeString(PARAMETER_VALUES,
"The value of this macro.", false), false));
return types;
}
}