Application: gvSIG desktop

package org.gvsig.expressionevaluator;

import java.util.List;

import org.apache.commons.lang3.Range;

public interface Function {

    public final String GROUP_NUMERIC = "Numeric";

    public final String GROUP_STRING = "String";

    public final String GROUP_DATETIME = "Datetime";

    public final String GROUP_BOOLEAN = "Boolean";

    public final String GROUP_OGC = "OGC";

    public final String GROUP_PROGRAMMING = "Programming";

    public final String GROUP_OTHER = "Other";

    public String group();

    public String name();

    public String returnType();

    public Range argc();

    public String description();

    public String template();

    public String[] descriptionArgs();

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

    public Object call(Interpreter interpreter, Codes args) throws Exception;

    public void addAlias(String name);

    public List<String> aliases();

    public boolean isOperator();

    public boolean useArgumentsInsteadObjects();

    public boolean isSQLCompatible();

    /**

     * Returns true if the function always returns the same value for 

     * the same parameters. If so, it is possible to optimize the 

     * generated code through the process of "constant folding".

     * 

     * https://en.wikipedia.org/wiki/Constant_folding

     * 

     * @return true if this function allow constant folding optimization.

     */

    public boolean allowConstantFolding();

}