/*****************************************************************************
SQLJEP - Java SQL Expression Parser 0.2
November 1 2006
(c) Copyright 2006, Alexey Gaidukov
SQLJEP Author: Alexey Gaidukov
SQLJEP is based on JEP 2.24 (http://www.singularsys.com/jep/)
(c) Copyright 2002, Nathan Funk
See LICENSE.txt for license information.
*****************************************************************************/
package com.meidusa.amoeba.sqljep.function;
import com.meidusa.amoeba.sqljep.function.PostfixCommand;
import com.meidusa.amoeba.sqljep.ASTFunNode;
import com.meidusa.amoeba.sqljep.JepRuntime;
import com.meidusa.amoeba.sqljep.ParseException;
public class Ltrim extends PostfixCommand {
final public int getNumberOfParameters() {
return -1;
}
public Comparable<?>[] evaluate(ASTFunNode node, JepRuntime runtime) throws ParseException {
node.childrenAccept(runtime.ev, null);
int num = node.jjtGetNumChildren();
if (num == 1) {
Comparable<?> param1 = runtime.stack.pop();
return new Comparable<?>[]{param1," "};
}
else if (num == 2) {
Comparable<?> param2 = runtime.stack.pop();
Comparable<?> param1 = runtime.stack.pop();
return new Comparable<?>[]{param1,param2};
} else {
// remove all parameters from stack and push null
removeParams(runtime.stack, num);
throw new ParseException(PARAMS_NUMBER+" for ltrim");
}
}
public static String ltrim(Comparable<?> param1, Comparable<?> param2) throws ParseException {
if (param1 == null || param2 == null) {
return null;
}
String inputStr = param1.toString();
String chars = param2.toString();
final int len = inputStr.length();
int i;
for (i = 0; i < len; i++) {
char c = inputStr.charAt(i);
if (chars.indexOf(c) == -1) {
break;
}
}
return inputStr.substring(i);
}
public Comparable<?> getResult(Comparable<?>... comparables)
throws ParseException {
return ltrim(comparables[0],comparables[1]);
}
}