Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.string;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class LTrimFunction extends AbstractFunction {

    public LTrimFunction() {

        super("String", "LTRIM", Range.is(1));

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) throws Exception {

        String str = getStr(args,0);

        return ltrim(str);

    }

    public static String ltrim(String s) {

        int i = 0;

        while( i < s.length() && Character.isWhitespace(s.charAt(i)) ) {

            i++;

        }

        return s.substring(i);

    }

}