/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.scxml2.model;
import org.apache.commons.scxml2.ActionExecutionContext;
import org.apache.commons.scxml2.Context;
import org.apache.commons.scxml2.Evaluator;
import org.apache.commons.scxml2.SCXMLExpressionException;
import org.apache.commons.scxml2.TriggerEvent;
/**
* The class in this SCXML object model that corresponds to the
* <var> SCXML element.
*
*/
public class Var extends Action {
/**
* Serial version UID.
*/
private static final long serialVersionUID = 1L;
/**
* The name of the variable to be created.
*/
private String name;
/**
* The expression that evaluates to the initial value of the variable.
*/
private String expr;
/**
* Constructor.
*/
public Var() {
super();
}
/**
* Get the expression that evaluates to the initial value
* of the variable.
*
* @return String Returns the expr.
*/
public final String getExpr() {
return expr;
}
/**
* Set the expression that evaluates to the initial value
* of the variable.
*
* @param expr The expr to set.
*/
public final void setExpr(final String expr) {
this.expr = expr;
}
/**
* Get the name of the (new) variable.
*
* @return String Returns the name.
*/
public final String getName() {
return name;
}
/**
* Set the name of the (new) variable.
*
* @param name The name to set.
*/
public final void setName(final String name) {
this.name = name;
}
/**
* {@inheritDoc}
*/
@Override
public void execute(ActionExecutionContext exctx) throws ModelException, SCXMLExpressionException {
Context ctx = exctx.getContext(getParentEnterableState());
Evaluator eval = exctx.getEvaluator();
ctx.setLocal(getNamespacesKey(), getNamespaces());
Object varObj = eval.eval(ctx, expr);
ctx.setLocal(getNamespacesKey(), null);
ctx.setLocal(name, varObj);
if (exctx.getAppLog().isDebugEnabled()) {
exctx.getAppLog().debug("<var>: Defined variable '" + name
+ "' with initial value '" + String.valueOf(varObj) + "'");
}
TriggerEvent ev = new TriggerEvent(name + ".change", TriggerEvent.CHANGE_EVENT);
exctx.getInternalIOProcessor().addEvent(ev);
}
}