/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.util;import com.opensymphony.module.propertyset.PropertySet;import com.opensymphony.provider.BeanProvider;import com.opensymphony.provider.bean.DefaultBeanProvider;import java.io.Serializable;import java.util.Map;/** * @author Hani Suleiman (hani@formicary.net) * Date: Oct 14, 2003 * Time: 11:58:12 PM */public class DefaultVariableResolver implements VariableResolver, Serializable {    //~ Static fields/initializers /////////////////////////////////////////////    private static final long serialVersionUID = -4819078273560683753L;    //~ Instance fields ////////////////////////////////////////////////////////    private transient BeanProvider beanProvider = null;    //~ Methods ////////////////////////////////////////////////////////////////    public void setBeanProvider(BeanProvider beanProvider) {        this.beanProvider = beanProvider;    }    public BeanProvider getBeanProvider() {        return beanProvider;    }    public Object getVariableFromMaps(String var, Map transientVars, PropertySet ps) {        int firstDot = var.indexOf('.');        String actualVar = var;        if (firstDot != -1) {            actualVar = var.substring(0, firstDot);        }        Object o = transientVars.get(actualVar);        if (o == null) {            o = ps.getAsActualType(actualVar);        }        if (firstDot != -1) {            if (beanProvider == null) {                beanProvider = new DefaultBeanProvider();            }            o = beanProvider.getProperty(o, var.substring(firstDot + 1));        }        return o;    }    /**       * Parses a string for instances of "${foo}" and returns a string with all instances replaced       * with the string value of the foo object (<b>foo.toString()</b>). If the string being passed       * in only refers to a single variable and contains no other characters (for example: ${foo}),       * then the actual object is returned instead of converting it to a string.       */    public Object translateVariables(String s, Map transientVars, PropertySet ps) {        String temp = s.trim();        if (temp.startsWith("${") && temp.endsWith("}") && (temp.indexOf('$', 1) == -1)) {            // the string is just a variable reference, don't convert it to a string            String var = temp.substring(2, temp.length() - 1);            return getVariableFromMaps(var, transientVars, ps);        } else {            // the string passed in contains multiple variables (or none!) and should be treated as a string            while (true) {                int x = s.indexOf("${");                int y = s.indexOf("}", x);                if ((x != -1) && (y != -1)) {                    String var = s.substring(x + 2, y);                    String t = null;                    Object o = getVariableFromMaps(var, transientVars, ps);                    if (o != null) {                        t = o.toString();                    }                    if (t != null) {                        s = s.substring(0, x) + t + s.substring(y + 1);                    } else {                        // the variable doesn't exist, so don't display anything                        s = s.substring(0, x) + s.substring(y + 1);                    }                } else {                    break;                }            }            return s;        }    }}