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package org.uscxml;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
public class ECMAScriptDataModel extends JavaDataModel {
protected Context ctx;
protected Scriptable scope;
@Override
public JavaDataModel create(Interpreter interpreter) {
/**
* Called when an SCXML interpreter wants an instance of this datamodel
* Be careful to instantiate attributes of instance returned and not *this*
*/
System.out.println("create");
ECMAScriptDataModel newDM = new ECMAScriptDataModel();
newDM.ctx = Context.enter();
try {
newDM.scope = newDM.ctx.initStandardObjects();
} catch(Exception e) {
System.err.println(e);
}
return newDM;
}
@Override
public StringSet getNames() {
/**
* Register with the following names for the datamodel attribute
* at the scxml element. <scxml datamodel="one of these">
*/
System.out.println("getNames");
StringSet ss = new StringSet();
ss.insert("ecmascript");
return ss;
}
@Override
public boolean validate(String location, String schema) {
/**
* Validate the datamodel. This make more sense for XML datamodels
* and is pretty much unused but required as per draft.
*/
System.out.println("validate " + location + " " + schema);
return true;
}
@Override
public void setEvent(Event event) {
/**
* Make the current event available as the variable _event
* in the datamodel.
*/
System.out.println("setEvent " + event);
}
@Override
public DataNative getStringAsData(String content) {
/**
* Evaluate the string as a value expression and
* transform it into a JSON-like Data structure
*/
System.out.println("getStringAsData " + content);
Data data = new Data();
// TODO: populate data object
return Data.toNative(data);
}
@Override
public long getLength(String expr) {
/**
* Return the length of the expression if it were an
* array, used by foreach element.
*/
System.out.println("getLength " + expr);
Object result = ctx.evaluateString(scope, expr, "uscxml", 1, null);
return (long) Context.toNumber(result);
}
@Override
public void setForeach(String item, String array, String index, long iteration) {
/**
* Prepare an iteration of the foreach element, by setting the variable in index
* to the current iteration and setting the variable in item to the current item
* from array.
*/
System.out.println("setForeach " + item + " " + index + " " + iteration);
}
@Override
public void eval(String scriptElem, String expr) {
/**
* Evaluate the given expression in the datamodel.
* This is used foremost with script elements.
*/
System.out.println("eval " + scriptElem + " " + expr);
ctx.evaluateString(scope, expr, "uscxml", 1, null);
}
@Override
public String evalAsString(String expr) {
/**
* Evaluate the expression as a string e.g. for the log element.
*/
System.out.println("evalAsString " + expr);
Object result = ctx.evaluateString(scope, expr, "uscxml", 1, null);
return Context.toString(result);
}
@Override
public boolean evalAsBool(String expr) {
/**
* Evaluate the expression as a boolean for cond attributes in
* if and transition elements.
*/
System.out.println("evalAsBool " + expr);
Object result = ctx.evaluateString(scope, expr, "uscxml", 1, null);
return Context.toBoolean(result);
}
@Override
public boolean isDeclared(String expr) {
/**
* The interpreter is supposed to raise an error if we assign
* to an undeclared variable. This method is used to check whether
* a location from assign is declared.
*/
System.out.println("isDeclared " + expr);
Object x = scope.get(expr, scope);
return x != Scriptable.NOT_FOUND;
}
@Override
public void init(String dataElem, String location, String content) {
/**
* Called when we pass data elements.
*/
System.out.println("init " + dataElem + " " + location + " " + content);
String expr = location + "=" + content;
ctx.evaluateString(scope, expr, "uscxml", 1, null);
}
@Override
public void assign(String assignElem, String location, String content) {
/**
* Called when we evaluate assign elements
*/
System.out.println("assign " + assignElem + " " + location + " " + content);
String expr = location + "=" + content;
ctx.evaluateString(scope, expr, "uscxml", 1, null);
}
}
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