Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Code;

import org.gvsig.expressionevaluator.Codes;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_$HOSTEXPRESSION;

import org.gvsig.expressionevaluator.Formatter;

public class $HostExpressionFunction extends AbstractFunction {

    // https://docs.oracle.com/cd/A87860_01/doc/java.817/a83723/blangfe3.htm

    // https://docs.oracle.com/cd/A57673_01/DOC/api/doc/PAD18/ch4.htm

    // Esta funcion esta pensada para dar soporte a la funcionadad de "Host expressions" de 

    // SQLJ o host variables de pl/sql

    public static final String MODE_SPECIFIER_IN = "IN";

    public static final String MODE_SPECIFIER_OUT = "OUT";

    public static final String MODE_SPECIFIER_INOUT = "INOUT";

    public static final String MODE_SPECIFIER_ID = "ID$";

    public $HostExpressionFunction() {

        super(Function.GROUP_PROGRAMMING, 

                FUNCTION_$HOSTEXPRESSION, 

            Range.between(1,2),

            "Returns the value passed as a parameter.\n",

            FUNCTION_$HOSTEXPRESSION+"({{expression}},mode_specifier)",

            null,

            "Object",

            false

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return false;

    }    

    @Override

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

        return args[0];        

    }

    @Override

    public String toString(Codes args, Formatter<Code> formatter) {

        return ":("+args.get(0).toString()+")";

    }

}