Android Open Source - sana Criterion

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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, ...

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Java Source Code

package org.moca.procedure.branching;
//www.  ja va2 s  .  c  o  m
import org.moca.procedure.MultiSelectElement;
import org.moca.procedure.ProcedureElement;
import org.moca.procedure.ProcedureParseException;
import org.moca.procedure.ProcedureElement.ElementType;

import android.util.Log;

/**
 * The Criterion class is a data representation of the XML 
 * <Criteria type="" elementId="" value=""/>
 * It holds a reference to the element elementId refers to so that it can 
 * determine user responses. The three Criterion Types (EQUALS, GREATER, LESS) are 
 * logically-complete, since a Criterion object will always sit inside a Criteria 
 * object, which can perform arbitrary boolean logic on it.
 */
public class Criterion {
    public static enum CriterionType {
        EQUALS, GREATER, LESS
    }
    private static final String TAG = "Criterion";
    private CriterionType criterionType;
    private ProcedureElement element;
    private String value;
    
    public Criterion(CriterionType critType, ProcedureElement elmt, String val) throws ProcedureParseException {
        this.criterionType = critType;
        this.element = elmt;
        this.value = val;
        if (elmt == null)
            throw new ProcedureParseException("Null element");
        if ((critType == CriterionType.GREATER) || (critType == CriterionType.LESS)) {
            try {
                Integer.parseInt(val);
            } catch (NumberFormatException e) {
                throw new ProcedureParseException("Cannot compare non-integer value. " +
                        "Cannot create criterion for element " + elmt.getId());
            }
        }
    }
    
    /**
     * Checks if the given Criterion is met, given user responses.
     * 
     * For a Criterion based on a Multi-Select element, if any of the choices
     * evaluates as true, then the Criterion is met.
     * 
     * For blank (unanswered, blank default) elements, criterionMet evaluates as true.
     */
    public boolean criterionMet() {
        // lookup what the user selected
        String userVal = "";
        try {
            userVal = element.getAnswer();
        } catch (NullPointerException e) {
            // play it safe and show the page
            return true;
        }           
        // check if it is empty
        if ((userVal == "") || (userVal== null)) {
            // empty user response, lets play it safe and show the page
            return true;
        }
        // special case MULTI-SELECT
        if (element.getType() == ElementType.MULTI_SELECT) {
            // We (arbitrarily) handle MultiSelect by seeing if 
            // ANY selection in the "answer" matches "val" 
            // if so, then it evaluates as true
            String[] vals = userVal.split(MultiSelectElement.TOKEN_DELIMITER);
            for (String s : vals) {
                if (criterionMetHelper(s))
                    return true;
            }
            return false;
        } else {
            // test the user's answer against the criterion
            return criterionMetHelper(userVal);
        }
    }
    
    private boolean criterionMetHelper(String userVal) {
        switch(criterionType) {
        case EQUALS:
            if (value.equals(userVal)) {
                return true;
            }
            break;
        case GREATER:
            try {
                if (Integer.parseInt(userVal) > Integer.parseInt(value))
                    return true;
            // show the page if we can't parse
            } catch (NumberFormatException e) {return true;}
            break;
        case LESS:
            try {
                if (Integer.parseInt(userVal) < Integer.parseInt(value))
                    return true;
            // show the page if we can't parse
            } catch (NumberFormatException e) {return true;}
            break;
        }
        return false;
    }
}

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