Android Open Source - sana Criteria

From Project

Back to project page sana.

License

The source code is released under:

Copyright (c) 2010, Moca All rights reserved. The source code for Moca is licensed under the BSD license as follows: Redistribution and use in source and binary forms, with or without modification, ...

If you think the Android project sana listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package org.moca.procedure.branching;
//  www  .  j  a  v a 2 s  .  c  om
import java.util.HashMap;

import org.moca.procedure.ProcedureElement;
import org.moca.procedure.ProcedureParseException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Criteria is the concrete base class for representing arbitrary logic that is
 * used to determine whether a page should be shown or not. Only create a base
 * Criteria object if you always want its crtieriaMet() method to return true.
 * 
 * A complex Criteria object may contain several other Criteria objects within
 * it at different levels of depth. The criteriaMet() method recursively
 * evaluates its contents.
 * 
 * Instantiating a ProcedurePage with the criteria-less constructor is
 * effectively the same as passing in a new Criteria() object into
 * ProcedurePage's regular constructor.
 * 
 */
public class Criteria {
    public static final String TAG = "Criteria";

    // use this constructor for an empty criteria set
    public Criteria() {

    }

    // child classes will override this method
    public boolean criteriaMet() {
        return true;
    }

    /**
     * A call to fromXML on a base Criteria type should only be used as a parse
     * entry- point on a ShowIf node. Child classes override this fromXML
     * method, and can be used on inner nodes. The fromXML method will recursively 
     * create a logic tree from the given XML description.
     */
    public static Criteria fromXML(Node node,
            HashMap<String, ProcedureElement> elts)
            throws ProcedureParseException {
        //Log.i(TAG, "Criteria.fromXML(" + node.toString() + ")");
        if (!node.getNodeName().equals("ShowIf")) {
            throw new ProcedureParseException("Criteria got NodeName "
                    + node.getNodeName());
        }

        NodeList children = node.getChildNodes();
        if (children.getLength() != 3) {
            throw new ProcedureParseException(
                    "Too many child nodes for a ShowIf: "
                            + children.getLength());
        }
        Node child = children.item(1);
        return Criteria.switchOnCriteria(child, elts);
    }

    public static Criteria switchOnCriteria(Node child,
            HashMap<String, ProcedureElement> elts)
            throws ProcedureParseException {
        Criteria c = new Criteria();
        if (child.getNodeName().equals("Criteria")) {
            c = LogicBase.fromXML(child, elts);
        } else if (child.getNodeName().equals("and")) {
            c = LogicAnd.fromXML(child, elts);
        } else if (child.getNodeName().equals("or")) {
            c = LogicOr.fromXML(child, elts);
        } else if (child.getNodeName().equals("not")) {
            c = LogicNot.fromXML(child, elts);
        }
        return c;
    }

}

Java Source Code List