Java Code Examples for org.springframework.expression.spel.support.StandardEvaluationContext#setRootObject()

@Test
public void testTernary() throws Exception {
	String falseString = parser.parseExpression("false ? 'trueExp' : 'falseExp'").getValue(String.class);
	assertEquals("falseExp",falseString);

	StandardEvaluationContext societyContext = new StandardEvaluationContext();
	societyContext.setRootObject(new IEEE());


	parser.parseExpression("Name").setValue(societyContext, "IEEE");
	societyContext.setVariable("queryName", "Nikola Tesla");

	String expression = "isMember(#queryName)? #queryName + ' is a member of the ' "
			+ "+ Name + ' Society' : #queryName + ' is not a member of the ' + Name + ' Society'";

	String queryResultString = parser.parseExpression(expression).getValue(societyContext, String.class);
	assertEquals("Nikola Tesla is a member of the IEEE Society",queryResultString);
	// queryResultString = "Nikola Tesla is a member of the IEEE Society"
}
 

@Test
public void indexIntoGenericPropertyContainingMapObject() {
	Map<String, Map<String, String>> property = new HashMap<String, Map<String, String>>();
	Map<String, String> map =  new HashMap<String, String>();
	map.put("foo", "bar");
	property.put("property", map);
	SpelExpressionParser parser = new SpelExpressionParser();
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new MapAccessor());
	context.setRootObject(property);
	Expression expression = parser.parseExpression("property");
	assertEquals("java.util.HashMap<?, ?>", expression.getValueTypeDescriptor(context).toString());
	assertEquals(map, expression.getValue(context));
	assertEquals(map, expression.getValue(context, Map.class));
	expression = parser.parseExpression("property['foo']");
	assertEquals("bar", expression.getValue(context));
}
 

@Test
public void testRootObject() throws Exception {
	GregorianCalendar c = new GregorianCalendar();
	c.set(1856, 7, 9);

	//  The constructor arguments are name, birthday, and nationaltiy.
	Inventor tesla = new Inventor("Nikola Tesla", c.getTime(), "Serbian");

	ExpressionParser parser = new SpelExpressionParser();
	Expression exp = parser.parseExpression("name");

	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setRootObject(tesla);

	String name = (String) exp.getValue(context);
	assertEquals("Nikola Tesla",name);
}
 

@Test
public void testScenario03_Arithmetic() throws Exception {
	SpelExpressionParser parser = new SpelExpressionParser();
	StandardEvaluationContext ctx = new StandardEvaluationContext();

	// Might be better with a as a variable although it would work as a property too...
	// Variable references using a '#'
	Expression expr = parser.parseRaw("(hasRole('SUPERVISOR') or (#a <  1.042)) and hasIpAddress('10.10.0.0/16')");

	Boolean value = null;

	ctx.setVariable("a",1.0d); // referenced as #a in the expression
	ctx.setRootObject(new Supervisor("Ben")); // so non-qualified references 'hasRole()' 'hasIpAddress()' are invoked against it
	value = expr.getValue(ctx,Boolean.class);
	assertTrue(value);

	ctx.setRootObject(new Manager("Luke"));
	ctx.setVariable("a",1.043d);
	value = expr.getValue(ctx,Boolean.class);
	assertFalse(value);
}
 

List<CmsCI> getEligbleOfferings(CmsRfcCISimple cmsRfcCISimple, String offeringNS) {
    List<CmsCI> offerings = new ArrayList<>(); 
    List<CmsCI> list = cmsCmProcessor.getCiBy3(offeringNS, "cloud.Offering", null);
    for (CmsCI ci: list){
        CmsCIAttribute criteriaAttribute = ci.getAttribute("criteria");
        String criteria = criteriaAttribute.getDfValue();
        if (isLikelyElasticExpression(criteria)){
            logger.warn("cloud.Offering CI ID:"+ci.getCiId()+" likely still has elastic search criteria. Evaluation may not be successful!");
            logger.info("ES criteria:"+criteria);
            criteria = convert(criteria);
            logger.info("Converted SPEL criteria:"+criteria);
        }
        Expression expression = exprParser.parseExpression(criteria);
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.setRootObject(cmsRfcCISimple);
        boolean match = (boolean) expression.getValue(context, Boolean.class);
        if (match){
            offerings.add(ci);
        }
    }
    return offerings;
}
 

@Test
public void testScenario01_Roles() throws Exception {
	try {
		SpelExpressionParser parser = new SpelExpressionParser();
		StandardEvaluationContext ctx = new StandardEvaluationContext();
		Expression expr = parser.parseRaw("hasAnyRole('MANAGER','TELLER')");

		ctx.setRootObject(new Person("Ben"));
		Boolean value = expr.getValue(ctx,Boolean.class);
		assertFalse(value);

		ctx.setRootObject(new Manager("Luke"));
		value = expr.getValue(ctx,Boolean.class);
		assertTrue(value);

	}
	catch (EvaluationException ee) {
		ee.printStackTrace();
		fail("Unexpected SpelException: " + ee.getMessage());
	}
}
 

@Test
public void indexIntoGenericPropertyContainingMapObject() {
	Map<String, Map<String, String>> property = new HashMap<>();
	Map<String, String> map = new HashMap<>();
	map.put("foo", "bar");
	property.put("property", map);
	SpelExpressionParser parser = new SpelExpressionParser();
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new MapAccessor());
	context.setRootObject(property);
	Expression expression = parser.parseExpression("property");
	assertEquals("java.util.HashMap<?, ?>", expression.getValueTypeDescriptor(context).toString());
	assertEquals(map, expression.getValue(context));
	assertEquals(map, expression.getValue(context, Map.class));
	expression = parser.parseExpression("property['foo']");
	assertEquals("bar", expression.getValue(context));
}
 

@Test
	public void test(){
		StandardEvaluationContext elcontext = new StandardEvaluationContext();
		TestBean tb = new TestBean();
		tb.aaa = "cccc";
		Map map = LangUtils.asMap("ccc", "dddd");
//		map.put("tb", tb);
		map.put("map", LangUtils.asMap("ccc", "dddd", "tb", tb));
		elcontext.setVariables(map);
		elcontext.setRootObject(tb);
		Expression exp = parser.parseExpression("'bb{ccc}'");
		Object val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("bb{ccc}", val);
		
		exp = parser.parseExpression("#ccc");
		val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("dddd", val);
		
		exp = parser.parseExpression("#map['tb'].aaa");
		val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("cccc", val);
	}
 

@Test
	public void test(){
		StandardEvaluationContext elcontext = new StandardEvaluationContext();
		TestBean tb = new TestBean();
		tb.aaa = "cccc";
		Map map = LangUtils.asMap("ccc", "dddd");
//		map.put("tb", tb);
		map.put("map", LangUtils.asMap("ccc", "dddd", "tb", tb));
		elcontext.setVariables(map);
		elcontext.setRootObject(tb);
		Expression exp = parser.parseExpression("'bb{ccc}'");
		Object val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("bb{ccc}", val);
		
		exp = parser.parseExpression("#ccc");
		val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("dddd", val);
		
		exp = parser.parseExpression("#map['tb'].aaa");
		val = (String)exp.getValue(elcontext, String.class);
		Assert.assertEquals("cccc", val);
	}
 

@Test
public void indexIntoGenericPropertyContainingMapObject() {
	Map<String, Map<String, String>> property = new HashMap<>();
	Map<String, String> map = new HashMap<>();
	map.put("foo", "bar");
	property.put("property", map);
	SpelExpressionParser parser = new SpelExpressionParser();
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new MapAccessor());
	context.setRootObject(property);
	Expression expression = parser.parseExpression("property");
	assertEquals("java.util.HashMap<?, ?>", expression.getValueTypeDescriptor(context).toString());
	assertEquals(map, expression.getValue(context));
	assertEquals(map, expression.getValue(context, Map.class));
	expression = parser.parseExpression("property['foo']");
	assertEquals("bar", expression.getValue(context));
}
 

@Test
	public void test2(){
		StandardEvaluationContext elcontext = new StandardEvaluationContext();
		TestBean tb = new TestBean();
		tb.aaa = "cccc";
		Map map = LangUtils.asMap("ccc", "dddd", "userName", "testUser");
//		map.put("tb", tb);
		map.put("map", LangUtils.asMap("ccc", "dddd", "tb", tb));
		elcontext.setRootObject(map);
		Expression exp = parser.parseExpression("['ccc']");
		Object val = (String)exp.getValue(elcontext, String.class);
		System.out.println("val: " + val);
		Assert.assertEquals("dddd", val);

		elcontext.setVariables(map);
		elcontext.setRootObject(null);
		exp = parser.parseExpression("I am ${#userName}", PARSER_CONTEXT);
		val = (String)exp.getValue(elcontext, String.class);
		System.out.println("val: " + val);
		Assert.assertEquals("I am testUser", val);
	}
 

private EvaluationContext getEvaluationContext(CmsWorkOrderBase woBase) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	if (woBase instanceof CmsWorkOrder) {
		CmsRfcCISimple rfcSimple = cmsUtil.custRfcCI2RfcCISimple(((CmsWorkOrder)woBase).getRfcCi());
		context.setRootObject(rfcSimple);
	} else if (woBase instanceof CmsActionOrder) {
		CmsCISimple ciSimple = cmsUtil.custCI2CISimple(((CmsActionOrder)woBase).getCi(), CmsConstants.ATTR_VALUE_TYPE_DF, true);
		context.setRootObject(ciSimple);
	}
	return context;
}
 

private String resolveRoutingValue(ProceedingJoinPoint jp, String routingValue) throws Exception {
    String resolvedValue = stringValueResolver.resolveStringValue(routingValue).trim();
    Matcher matcher = pattern.matcher(resolvedValue);
    if(matcher.find()) {
        // prepare execution context
        StandardEvaluationContext simpleContext = new StandardEvaluationContext();
        simpleContext.setRootObject(jp.getTarget()); // or getThis?
        simpleContext.setVariable("args", jp.getArgs());

        MethodSignature signature = (MethodSignature) jp.getSignature();
        Method method = signature.getMethod();
        Annotation[][] annotations = method.getParameterAnnotations();
        for(int i=0; i<annotations.length; i++) {
            if(annotations[i]==null || annotations[i].length==0) continue;
            RoutingVariable routingParam = null;
            for(Annotation annotation : annotations[i]) {
                if(annotation.annotationType() == RoutingVariable.class) {
                    routingParam = (RoutingVariable) annotation;
                    break;
                }
            }
            if(routingParam!=null) {
                simpleContext.setVariable(routingParam.value(), jp.getArgs()[i]);
            }
        }
        String elExpr = matcher.group(1);
        resolvedValue = expressionCache.get(elExpr).getValue(simpleContext, String.class);
    }
    return resolvedValue;
}
 

@SuppressWarnings("unchecked")
@Test
public void testSelection() throws Exception {
	StandardEvaluationContext societyContext = new StandardEvaluationContext();
	societyContext.setRootObject(new IEEE());
	List<Inventor> list = (List<Inventor>) parser.parseExpression("Members2.?[nationality == 'Serbian']").getValue(societyContext);
	assertEquals(1,list.size());
	assertEquals("Nikola Tesla",list.get(0).getName());
}
 

@Test
public void testAssignment() throws Exception {
	Inventor inventor = new Inventor();
	StandardEvaluationContext inventorContext = new StandardEvaluationContext();
	inventorContext.setRootObject(inventor);

	parser.parseExpression("foo").setValue(inventorContext, "Alexander Seovic2");

	assertEquals("Alexander Seovic2",parser.parseExpression("foo").getValue(inventorContext,String.class));
	// alternatively

	String aleks = parser.parseExpression("foo = 'Alexandar Seovic'").getValue(inventorContext, String.class);
	assertEquals("Alexandar Seovic",parser.parseExpression("foo").getValue(inventorContext,String.class));
	assertEquals("Alexandar Seovic",aleks);
}
 

@Test
public void testLogicalOperators() throws Exception {

	StandardEvaluationContext societyContext = new StandardEvaluationContext();
	societyContext.setRootObject(new IEEE());

	// -- AND --

	// evaluates to false
	boolean falseValue = parser.parseExpression("true and false").getValue(Boolean.class);
	assertFalse(falseValue);
	// evaluates to true
	String expression =  "isMember('Nikola Tesla') and isMember('Mihajlo Pupin')";
	boolean trueValue = parser.parseExpression(expression).getValue(societyContext, Boolean.class);

	// -- OR --

	// evaluates to true
	trueValue = parser.parseExpression("true or false").getValue(Boolean.class);
	assertTrue(trueValue);

	// evaluates to true
	expression =  "isMember('Nikola Tesla') or isMember('Albert Einstien')";
	trueValue = parser.parseExpression(expression).getValue(societyContext, Boolean.class);
	assertTrue(trueValue);

	// -- NOT --

	// evaluates to false
	falseValue = parser.parseExpression("!true").getValue(Boolean.class);
	assertFalse(falseValue);


	// -- AND and NOT --
	expression =  "isMember('Nikola Tesla') and !isMember('Mihajlo Pupin')";
	falseValue = parser.parseExpression(expression).getValue(societyContext, Boolean.class);
	assertFalse(falseValue);
}
 

@Test
public void testEqualityCheck() throws Exception {
	ExpressionParser parser = new SpelExpressionParser();

	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setRootObject(tesla);

	Expression exp = parser.parseExpression("name == 'Nikola Tesla'");
	boolean isEqual = exp.getValue(context, Boolean.class);  // evaluates to true
	assertTrue(isEqual);
}
 

@Test
public void testConstructors() throws Exception {
	StandardEvaluationContext societyContext = new StandardEvaluationContext();
	societyContext.setRootObject(new IEEE());
	Inventor einstein =
		   parser.parseExpression("new org.springframework.expression.spel.testresources.Inventor('Albert Einstein',new java.util.Date(), 'German')").getValue(Inventor.class);
	assertEquals("Albert Einstein", einstein.getName());
	//create new inventor instance within add method of List
	parser.parseExpression("Members2.add(new org.springframework.expression.spel.testresources.Inventor('Albert Einstein', 'German'))").getValue(societyContext);
}
 

@Test
public void testEqualityCheck() throws Exception {
	ExpressionParser parser = new SpelExpressionParser();

	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setRootObject(tesla);

	Expression exp = parser.parseExpression("name == 'Nikola Tesla'");
	boolean isEqual = exp.getValue(context, Boolean.class);  // evaluates to true
	assertTrue(isEqual);
}
 

/**
 * Scenario: using your own root context object
 */
@Test
public void testScenario_UsingADifferentRootContextObject() throws Exception {
	// Create a parser
	SpelExpressionParser parser = new SpelExpressionParser();
	// Use the standard evaluation context
	StandardEvaluationContext ctx = new StandardEvaluationContext();

	TestClass tc = new TestClass();
	tc.setProperty(42);
	tc.str = "wibble";
	ctx.setRootObject(tc);

	// read it, set it, read it again
	Expression expr = parser.parseRaw("str");
	Object value = expr.getValue(ctx);
	assertEquals("wibble", value);
	expr = parser.parseRaw("str");
	expr.setValue(ctx, "wobble");
	expr = parser.parseRaw("str");
	value = expr.getValue(ctx);
	assertEquals("wobble", value);
	// or using assignment within the expression
	expr = parser.parseRaw("str='wabble'");
	value = expr.getValue(ctx);
	expr = parser.parseRaw("str");
	value = expr.getValue(ctx);
	assertEquals("wabble", value);

	// private property will be accessed through getter()
	expr = parser.parseRaw("property");
	value = expr.getValue(ctx);
	assertEquals(42, value);

	// ... and set through setter
	expr = parser.parseRaw("property=4");
	value = expr.getValue(ctx);
	expr = parser.parseRaw("property");
	value = expr.getValue(ctx);
	assertEquals(4,value);
}