Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class LeftFunction extends AbstractFunction {

    public LeftFunction() {

        super("String", "LEFT", Range.is(2));

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

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

        String str = getStr(args,0);

        int len = getInt(args, 1);

        String r = StringUtils.left(str, len);

        return r;

    }

}