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/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2013 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.compilers;
import java.util.Iterator;
import java.util.Map;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.fill.JREvaluator;
import net.sf.jasperreports.engine.fill.JRFillField;
import net.sf.jasperreports.engine.fill.JRFillParameter;
import net.sf.jasperreports.engine.fill.JRFillVariable;
import net.sf.jasperreports.functions.FunctionsUtil;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.ScriptableObject;
/**
* @author Lucian Chirita ([email protected])
* @version $Id: JavaScriptEvaluatorScope.java 6192 2013-05-29 08:37:41Z lucianc $
*/
public class JavaScriptEvaluatorScope
{
protected static final String EVALUATOR_VAR = "_jreval";
/**
* Base JavaScript value class.
*/
public abstract static class JSValue
{
private final ScriptableObject scope;
protected JSValue(ScriptableObject scope)
{
this.scope = scope;
}
protected final Object toJSValue(Object value)
{
return Context.javaToJS(value, scope);
}
}
/**
* Parameter class used in JavaScript expressions.
*/
public static class JSParameter extends JSValue
{
private final JRFillParameter parameter;
public JSParameter(JRFillParameter parameter, ScriptableObject scope)
{
super(scope);
this.parameter = parameter;
}
public Object getValue()
{
return toJSValue(parameter.getValue());
}
}
/**
* Field class used in JavaScript expressions.
*/
public static class JSField extends JSValue
{
private final JRFillField field;
public JSField(JRFillField field, ScriptableObject scope)
{
super(scope);
this.field = field;
}
public Object getValue()
{
return toJSValue(field.getValue());
}
public Object getOldValue()
{
return toJSValue(field.getOldValue());
}
}
/**
* Variable class used in JavaScript expressions.
*/
public static class JSVariable extends JSValue
{
private final JRFillVariable variable;
public JSVariable(JRFillVariable variable, ScriptableObject scope)
{
super(scope);
this.variable = variable;
}
public Object getValue()
{
return toJSValue(variable.getValue());
}
public Object getOldValue()
{
return toJSValue(variable.getOldValue());
}
public Object getEstimatedValue()
{
return toJSValue(variable.getEstimatedValue());
}
}
private Context context;
private ScriptableObject scope;
public JavaScriptEvaluatorScope(Context context, JREvaluator evaluator, FunctionsUtil functionsUtil)
{
this.context = context;
JavaScriptFunctionsObject functionsObject = new JavaScriptFunctionsObject(context, functionsUtil, evaluator);
this.scope = context.initStandardObjects();
// is this OK? the original prototype set by initStandardObjects is lost, and functionsObject has no prototype.
// seems to be fine for now, if not we could try setting the Object prototype to functionsObject.
this.scope.setPrototype(functionsObject);
this.scope.put(EVALUATOR_VAR, this.scope, evaluator);
}
public void init(Map parametersMap,
Map fieldsMap,
Map variablesMap)
{
for (Iterator> it = parametersMap.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = it.next();
String name = entry.getKey();
JRFillParameter param = entry.getValue();
JSParameter jsParam = new JSParameter(param, scope);
scope.put(JavaScriptCompiler.getParameterVar(name), scope, jsParam);
}
for (Iterator> it = variablesMap.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = it.next();
String name = entry.getKey();
JRFillVariable var = entry.getValue();
JSVariable jsVar = new JSVariable(var, scope);
scope.put(JavaScriptCompiler.getVariableVar(name), scope, jsVar);
}
if (fieldsMap != null)
{
for (Iterator> it = fieldsMap.entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = it.next();
String name = entry.getKey();
JRFillField field = entry.getValue();
JSField jsField = new JSField(field, scope);
scope.put(JavaScriptCompiler.getFieldVar(name), scope, jsField);
}
}
}
public Object evaluateExpression(Script expression)
{
Object value = expression.exec(context, scope);
Object javaValue;
// not converting Number objects because the generic conversion call below
// always converts to Double
if (value == null || value instanceof Number)
{
javaValue = value;
}
else
{
try
{
javaValue = Context.jsToJava(value, Object.class);
}
catch (EvaluatorException e)
{
throw new JRRuntimeException(e);
}
}
return javaValue;
}
public void setScopeVariable(String name, Object value)
{
scope.put(name, scope, value);
}
}
