/*
* RapidMiner
*
* Copyright (C) 2001-2014 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.tools.jep.function.expressions.text;
import java.util.Stack;
import org.nfunk.jep.ParseException;
import org.nfunk.jep.function.PostfixMathCommand;
import com.rapidminer.tools.expression.parser.UnknownValue;
/**
* Replaces substrings by matching targetSequence to given string, without regexp-evaluation.
*
* @author Sebastian Land
*/
public class Replace extends PostfixMathCommand {
public Replace() {
numberOfParameters = 3;
}
@SuppressWarnings("unchecked")
@Override
public void run(Stack stack) throws ParseException {
checkStack(stack);// check the stack
// initialize the result to the first argument
Object byObject = stack.pop();
Object whatObject = stack.pop();
Object textObject = stack.pop();
// checking for unknown value
if (textObject == UnknownValue.UNKNOWN_NOMINAL || whatObject == UnknownValue.UNKNOWN_NOMINAL || byObject == UnknownValue.UNKNOWN_NOMINAL) {
stack.push(UnknownValue.UNKNOWN_NOMINAL);
return;
}
if (!(textObject instanceof String) || !(byObject instanceof String) || !(whatObject instanceof String)) {
throw new ParseException(
"Invalid argument type, must be (string, string, string)");
}
String by = (String) byObject;
String what = (String) whatObject;
String text = (String) textObject;
if (what.length() == 0)
throw new ParseException("The target String must contain text");
stack.push(text.replace(what, by));
}
}