Application: gvSIG desktop

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

import java.util.ArrayList;

import java.util.List;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_MAP;

import org.gvsig.tools.util.GetItemWithSize;

import org.gvsig.tools.util.GetItemWithSize64;

public class MapFunction extends AbstractFunction {

    public MapFunction() {

        super(Function.GROUP_PROGRAMMING, 

                FUNCTION_MAP, 

                Range.is(2),

                null,

                FUNCTION_MAP+"({{function}}, list)",

                null,

                "List",

                false

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return false;

    }

    @Override

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

        GetItemWithSize64 list_in = this.getList(args, 1);

        List<Object> list_out = new ArrayList<>(); 

        Function func = (Function) this.getObject(args, 0);

        for (long i = 0; i < list_in.size64(); i++) {

            Object obj = list_in.get64(i);

            Object v = func.call(interpreter, new Object[] { obj });

            list_out.add(v);

        }

        return list_out;

    }

}