/*
 * GenericHandler.java
 *
 * Created on April 1, 2008, 7:06 PM
 * 
 * Copyright 2008, Britt Miner.
 */
package org.bminer.jbpm.pd;

import org.jbpm.graph.exe.ExecutionContext;

import org.bminer.jbpm.util.*;

/**
 *
 * @author bminer
 */
public abstract class GenericHandler {

    ElHelper elHelper = new ElHelper();
    
    protected String conditionExpression = null;

    /* Returns True if the conditionExpression is empty or evaluates to True. Returns
     * False if the conditionExpression is not empty and returns False.
     */
    protected boolean checkCondition(ExecutionContext ec) {
        return elHelper.evaluateElAsCondition(conditionExpression, ec);
    }

    /* Evaluate the input as a possible EL expression. */
    protected Object evaluateEL(String inputStr, ExecutionContext ec) {
        return elHelper.evaluateEL(inputStr, ec);
    }

    /* Treats input as a possible series of EL expressions and concatenates what
     * is found.
     */
    protected String concatenateEL(String inputStr, ExecutionContext ec) {
        return elHelper.concatenateEL(inputStr, ec);
    }

    /* Returns true if the value is a String which contains the pattern delineating
     * an EL expression.
     */
    protected boolean hasEL(Object value) {
        return elHelper.hasEL(value);
    }
    
    /* Returns true if the value is a String which in its entirety composes  
     * one EL expression.
     */
    protected boolean isEL(Object value) {
        return elHelper.isEL(value);
    }

    protected boolean evaluateElAsCondition(String inputStr, ExecutionContext ec) {
        return elHelper.evaluateElAsCondition(inputStr, ec);
    }

    public void setConditionExpression(String condition) {
        this.conditionExpression = condition.trim();
    }
    
    public void setCondition(String condition) {
        this.conditionExpression = condition.trim();
    }

}