Java > Open Source Codes > org > apache > commons > jexl > JexlTest


1 /*
2  * Copyright 2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.jexl;
17
18 import java.io.StringReader ;
19 import java.util.ArrayList ;
20 import java.util.BitSet ;
21 import java.util.HashMap ;
22 import java.util.HashSet ;
23 import java.util.LinkedList ;
24 import java.util.List ;
25 import java.util.Map ;
26 import java.util.Collections ;
27 import java.util.Set ;
28
29 import junit.framework.Test;
30 import junit.framework.TestCase;
31 import junit.framework.TestSuite;
32
33 import org.apache.commons.jexl.parser.ParseException;
34 import org.apache.commons.jexl.parser.Parser;
35 import org.apache.commons.jexl.parser.SimpleNode;
36 import org.apache.commons.jexl.resolver.FlatResolver;
37
38 /**
39  * Simple testcases
40  *
41  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
42  * @version $Id: JexlTest.java,v 1.60 2004/09/01 00:35:38 dion Exp $
43  */
44 public class JexlTest extends TestCase
45 {
46     protected static final String METHOD_STRING = "Method string";
47     protected static final String GET_METHOD_STRING = "GetMethod string";
48
49     protected static final String [] GET_METHOD_ARRAY =
50         new String [] { "One", "Two", "Three" };
51
52     protected static final String [][] GET_METHOD_ARRAY2 =
53         new String [][] { {"One", "Two", "Three"},{"Four", "Five", "Six"} };
54
55     public static Test suite()
56     {
57         return new TestSuite(JexlTest.class);
58     }
59
60     public JexlTest(String testName)
61     {
62         super(testName);
63     }
64
65     /**
66       * test a simple property expression
67       */
68     public void testProperty()
69          throws Exception
70     {
71         /*
72          * tests a simple property expression
73          */
74
75         Expression e = ExpressionFactory.createExpression("foo.bar");
76         JexlContext jc = JexlHelper.createContext();
77
78         jc.getVars().put("foo", new Foo() );
79         Object o = e.evaluate(jc);
80
81         assertTrue("o not instanceof String", o instanceof String );
82         assertTrue("o incorrect", o.equals(GET_METHOD_STRING));
83     }
84
85     /**
86       * test a simple method expression
87       */
88     public void testMethod()
89          throws Exception
90     {
91         /*
92          * tests a simple method expression
93          */
94         JexlContext jc = JexlHelper.createContext();
95         jc.getVars().put("foo", new Foo() );
96         assertExpression(jc, "foo.bar()", METHOD_STRING);
97     }
98
99     /**
100       * test a simple method expression
101       */
102     public void testArrayAccess()
103          throws Exception
104     {
105         JexlContext jc = JexlHelper.createContext();
106
107         /*
108          * test List access
109          */
110
111         List l = new ArrayList ();
112         l.add(new Integer (1));
113         l.add(new Integer (2));
114         l.add(new Integer (3));
115
116         jc.getVars().put("list", l);
117
118         assertExpression(jc, "list[1]", new Integer (2));
119         assertExpression(jc, "list[1+1]", new Integer (3));
120         jc.getVars().put("loc", new Integer (1));
121         assertExpression(jc, "list[loc+1]", new Integer (3));
122
123         /*
124          * test array access
125          */
126
127         String [] args = {"hello", "there"};
128         jc.getVars().put("array", args);
129         assertExpression(jc, "array[0]", "hello");
130
131         /*
132          * to think that this was an intentional syntax...
133          */
134         assertExpression(jc, "array.0", "hello");
135
136         /*
137          * test map access
138          */
139         Map m = new HashMap ();
140         m.put("foo", "bar");
141
142         jc.getVars().put("map", m);
143         jc.getVars().put("key", "foo");
144
145         assertExpression(jc, "map[\"foo\"]", "bar");
146         assertExpression(jc, "map[key]", "bar");
147
148         /*
149          * test bean access
150          */
151         jc.getVars().put("foo", new Foo());
152         assertExpression(jc, "foo[\"bar\"]", GET_METHOD_STRING);
153         assertExpression(jc, "foo[\"bar\"] == foo.bar", Boolean.TRUE);
154
155     }
156
157     public void testMulti()
158          throws Exception
159     {
160         /*
161          * tests a simple property expression
162          */
163         JexlContext jc = JexlHelper.createContext();
164         jc.getVars().put("foo", new Foo() );
165         assertExpression(jc, "foo.innerFoo.bar()", METHOD_STRING);
166     }
167
168     public void testBoolean()
169          throws Exception
170     {
171         JexlContext jc = JexlHelper.createContext();
172         jc.getVars().put("foo", new Foo() );
173         jc.getVars().put("a", Boolean.TRUE);
174         jc.getVars().put("b", Boolean.FALSE);
175
176         assertExpression(jc, "foo.convertBoolean(a==b)", "Boolean : false");
177         assertExpression(jc, "foo.convertBoolean(a==true)", "Boolean : true");
178         assertExpression(jc, "foo.convertBoolean(a==false)", "Boolean : false");
179         assertExpression(jc, "foo.convertBoolean(true==false)", "Boolean : false");
180         assertExpression(jc, "true eq false", Boolean.FALSE);
181         assertExpression(jc, "true ne false", Boolean.TRUE);
182     }
183
184     public void testStringLit()
185          throws Exception
186     {
187         /*
188          * tests a simple property expression
189          */
190         JexlContext jc = JexlHelper.createContext();
191         jc.getVars().put("foo", new Foo() );
192         assertExpression(jc, "foo.get(\"woogie\")", "Repeat : woogie");
193     }
194
195     public void testExpression()
196          throws Exception
197     {
198         JexlContext jc = JexlHelper.createContext();
199         jc.getVars().put("foo", new Foo() );
200         jc.getVars().put("a", Boolean.TRUE);
201         jc.getVars().put("b", Boolean.FALSE);
202         jc.getVars().put("num", new Integer (5));
203
204         assertExpression(jc, "a == b", Boolean.FALSE);
205         assertExpression(jc, "a==true", Boolean.TRUE);
206         assertExpression(jc, "a==false", Boolean.FALSE);
207         assertExpression(jc, "true==false", Boolean.FALSE);
208         assertExpression(jc, "num < 3", Boolean.FALSE);
209         assertExpression(jc, "num <= 5", Boolean.TRUE);
210         assertExpression(jc, "num >= 5", Boolean.TRUE);
211         assertExpression(jc, "num > 4", Boolean.TRUE);
212         assertExpression(jc, "\"foo\" + \"bar\" == \"foobar\"", Boolean.TRUE);
213
214     }
215
216     public void testEmpty()
217          throws Exception
218     {
219         JexlContext jc = JexlHelper.createContext();
220         jc.getVars().put("string", "");
221         jc.getVars().put("array", new Object [0]);
222         jc.getVars().put("map", new HashMap ());
223         jc.getVars().put("list", new ArrayList ());
224         jc.getVars().put("set", (new HashMap ()).keySet());
225         jc.getVars().put("longstring", "thingthing");
226
227         /*
228          * I can't believe anyone thinks this is a syntax.. :)
229          */
230         assertExpression(jc, "empty nullthing", Boolean.TRUE);
231         assertExpression(jc, "empty string", Boolean.TRUE);
232         assertExpression(jc, "empty array", Boolean.TRUE);
233         assertExpression(jc, "empty map", Boolean.TRUE);
234         assertExpression(jc, "empty set", Boolean.TRUE);
235         assertExpression(jc, "empty list", Boolean.TRUE);
236         assertExpression(jc, "empty longstring", Boolean.FALSE);
237         assertExpression(jc, "not empty longstring", Boolean.TRUE);
238     }
239
240     public void testSize()
241          throws Exception
242     {
243         JexlContext jc = JexlHelper.createContext();
244         jc.getVars().put("s", "five!");
245         jc.getVars().put("array", new Object [5]);
246
247         Map map = new HashMap ();
248
249         map.put("1", new Integer (1));
250         map.put("2", new Integer (2));
251         map.put("3", new Integer (3));
252         map.put("4", new Integer (4));
253         map.put("5", new Integer (5));
254
255         jc.getVars().put("map", map);
256
257         List list = new ArrayList ();
258
259         list.add("1");
260         list.add("2");
261         list.add("3");
262         list.add("4");
263         list.add("5");
264
265         jc.getVars().put("list", list);
266
267         // 30652 - support for set
268 Set set = new HashSet ();
269         set.addAll(list);
270         set.add("1");
271         
272         jc.getVars().put("set", set);
273         
274         // support generic int size() method
275 BitSet bitset = new BitSet (5);
276         jc.getVars().put("bitset", bitset);
277
278         assertExpression(jc, "size(s)", new Integer (5));
279         assertExpression(jc, "size(array)", new Integer (5));
280         assertExpression(jc, "size(list)", new Integer (5));
281         assertExpression(jc, "size(map)", new Integer (5));
282         assertExpression(jc, "size(set)", new Integer (5));
283         assertExpression(jc, "size(bitset)", new Integer (64));
284         assertExpression(jc, "list.size()", new Integer (5));
285         assertExpression(jc, "map.size()", new Integer (5));
286         assertExpression(jc, "set.size()", new Integer (5));
287         assertExpression(jc, "bitset.size()", new Integer (64));
288
289         assertExpression(jc, "list.get(size(list) - 1)", "5");
290         assertExpression(jc, "list[size(list) - 1]", "5");
291         assertExpression(jc, "list.get(list.size() - 1)", "5");
292     }
293
294     public void testSizeAsProperty() throws Exception
295     {
296         JexlContext jc = JexlHelper.createContext();
297
298         jc.getVars().put("map", Collections.singletonMap( "size", "cheese"));
299         jc.getVars().put("foo", new Foo());
300
301         assertExpression(jc, "map['size']", "cheese");
302 // PR - unsure whether or not we should support map.size or force usage of the above 'escaped' version
303 // assertExpression(jc, "map.size", "cheese");
304 assertExpression(jc, "foo.getSize()", new Integer (22));
305         // failing assertion for size property
306 //assertExpression(jc, "foo.size", new Integer(22));
307 }
308
309     /**
310       * test some String method calls
311       */
312     public void testStringMethods()
313          throws Exception
314     {
315         JexlContext jc = JexlHelper.createContext();
316
317         jc.getVars().put("foo", "abcdef");
318
319         assertExpression(jc, "foo.substring(3)", "def");
320         assertExpression(jc, "foo.substring(0,(size(foo)-3))", "abc");
321         assertExpression(jc, "foo.substring(0,size(foo)-3)", "abc");
322         assertExpression(jc, "foo.substring(0,foo.length()-3)", "abc");
323     }
324
325
326
327     /**
328       * test some simple mathematical calculations
329       */
330     public void testCalculations()
331          throws Exception
332     {
333         Expression e = null;
334         JexlContext jc = JexlHelper.createContext();
335
336         jc.getVars().put("foo", new Integer (2) );
337         Object o = null;
338
339         assertExpression(jc, "foo + 2", new Long (4));
340         assertExpression(jc, "3 + 3", new Long (6));
341         assertExpression(jc, "3 + 3 + foo", new Long (8));
342         assertExpression(jc, "3 * 3", new Long (9));
343         assertExpression(jc, "3 * 3 + foo", new Long (11));
344         assertExpression(jc, "3 * 3 - foo", new Long (7));
345
346         /*
347          * test some floaty stuff
348          */
349         assertExpression(jc, "3 * \"3.0\"", new Double (9));
350         assertExpression(jc, "3 * 3.0", new Double (9));
351
352         /*
353          * test / and %
354          */
355         assertExpression(jc, "6 / 3", new Double (6/3));
356         assertExpression(jc, "6.4 / 3", new Double (6.4 / 3));
357         assertExpression(jc, "0 / 3", new Double (0 / 3));
358         assertExpression(jc, "3 / 0", new Double (0));
359         assertExpression(jc, "4 % 3", new Long (1));
360         assertExpression(jc, "4.8 % 3", new Double (4.8 % 3));
361
362         /*
363          * test to ensure new string cat works
364          */
365         jc.getVars().put("stringy", "thingy" );
366         assertExpression(jc, "stringy + 2", "thingy2");
367
368         /*
369          * test new null coersion
370          */
371         jc.getVars().put("imanull", null );
372         assertExpression(jc, "imanull + 2", new Long (2));
373         assertExpression(jc, "imanull + imanull", new Long (0));
374     }
375
376     /**
377       * test some simple conditions
378       */
379     public void testConditions()
380          throws Exception
381     {
382         JexlContext jc = JexlHelper.createContext();
383         jc.getVars().put("foo", new Integer (2) );
384         jc.getVars().put("aFloat", new Float (1));
385         jc.getVars().put("aDouble", new Double (2));
386         jc.getVars().put("aChar", new Character ('A'));
387         jc.getVars().put("aBool", Boolean.TRUE);
388         StringBuffer buffer = new StringBuffer ("abc");
389         List list = new ArrayList ();
390         List list2 = new LinkedList ();
391         jc.getVars().put("aBuffer", buffer);
392         jc.getVars().put("aList", list);
393         jc.getVars().put("bList", list2);
394         
395         assertExpression(jc, "foo == 2", Boolean.TRUE);
396         assertExpression(jc, "2 == 3", Boolean.FALSE);
397         assertExpression(jc, "3 == foo", Boolean.FALSE);
398         assertExpression(jc, "3 != foo", Boolean.TRUE);
399         assertExpression(jc, "foo != 2", Boolean.FALSE);
400         // test float and double equality
401 assertExpression(jc, "aFloat eq aDouble", Boolean.FALSE);
402         assertExpression(jc, "aFloat ne aDouble", Boolean.TRUE);
403         assertExpression(jc, "aFloat == aDouble", Boolean.FALSE);
404         assertExpression(jc, "aFloat != aDouble", Boolean.TRUE);
405         // test number and character equality
406 assertExpression(jc, "foo == aChar", Boolean.FALSE);
407         assertExpression(jc, "foo != aChar", Boolean.TRUE);
408         // test string and boolean
409 assertExpression(jc, "aBool == 'true'", Boolean.TRUE);
410         assertExpression(jc, "aBool == 'false'", Boolean.FALSE);
411         assertExpression(jc, "aBool != 'false'", Boolean.TRUE);
412         // test null and boolean
413 assertExpression(jc, "aBool == notThere", Boolean.FALSE);
414         assertExpression(jc, "aBool != notThere", Boolean.TRUE);
415         // anything and string as a string comparison
416 assertExpression(jc, "aBuffer == 'abc'", Boolean.TRUE);
417         assertExpression(jc, "aBuffer != 'abc'", Boolean.FALSE);
418         // arbitrary equals
419 assertExpression(jc, "aList == bList", Boolean.TRUE);
420         assertExpression(jc, "aList != bList", Boolean.FALSE);
421     }
422
423     /**
424       * test some simple conditions
425       */
426     public void testNotConditions()
427          throws Exception
428     {
429         JexlContext jc = JexlHelper.createContext();
430
431         Foo foo = new Foo();
432         jc.getVars().put("x", Boolean.TRUE );
433         jc.getVars().put("foo", foo );
434         jc.getVars().put("bar", "true" );
435
436         assertExpression(jc, "!x", Boolean.FALSE);
437         assertExpression(jc, "x", Boolean.TRUE);
438         assertExpression(jc, "!bar", Boolean.FALSE);
439         assertExpression(jc, "!foo.isSimple()", Boolean.FALSE);
440         assertExpression(jc, "foo.isSimple()", Boolean.TRUE);
441         assertExpression(jc, "!foo.simple", Boolean.FALSE);
442         assertExpression(jc, "foo.simple", Boolean.TRUE);
443         assertExpression(jc, "foo.getCheeseList().size() == 3", Boolean.TRUE);
444         assertExpression(jc, "foo.cheeseList.size() == 3", Boolean.TRUE);
445
446         jc.getVars().put("string", "");
447         assertExpression(jc, "not empty string", Boolean.FALSE);
448         assertExpression(jc, "not(empty string)", Boolean.FALSE);
449         assertExpression(jc, "not empty(string)", Boolean.FALSE);
450         assertExpression(jc, "! empty string", Boolean.FALSE);
451         assertExpression(jc, "!(empty string)", Boolean.FALSE);
452         assertExpression(jc, "!empty(string)", Boolean.FALSE);
453
454     }
455
456
457     /**
458       * GMJ : disabled - need to fix
459       *
460       * test some simple conditions
461       */
462     public void testNotConditionsWithDots()
463          throws Exception
464     {
465         Expression e = ExpressionFactory.createExpression("x.a");
466         JexlContext jc = JexlHelper.createContext();
467
468         jc.getVars().put("x.a", Boolean.TRUE );
469         jc.getVars().put("x.b", Boolean.FALSE );
470
471         assertExpression(jc, "x.a", Boolean.TRUE);
472         assertExpression(jc, "!x.a", Boolean.FALSE);
473         assertExpression(jc, "!x.b", Boolean.TRUE);
474     }
475
476     /**
477       * test some simple conditions
478       */
479     public void testComparisons()
480          throws Exception
481     {
482         JexlContext jc = JexlHelper.createContext();
483         jc.getVars().put("foo", "the quick and lazy fox" );
484
485         assertExpression(jc, "foo.indexOf('quick') > 0", Boolean.TRUE);
486         assertExpression(jc, "foo.indexOf('bar') >= 0", Boolean.FALSE);
487         assertExpression(jc, "foo.indexOf('bar') < 0", Boolean.TRUE);
488     }
489
490     /**
491       * test some null conditions
492       */
493     public void testNull()
494          throws Exception
495     {
496         JexlContext jc = JexlHelper.createContext();
497         jc.getVars().put("bar", new Integer (2) );
498
499         assertExpression(jc, "empty foo", Boolean.TRUE);
500         assertExpression(jc, "bar == null", Boolean.FALSE);
501         assertExpression(jc, "foo == null", Boolean.TRUE);
502         assertExpression(jc, "bar != null", Boolean.TRUE);
503         assertExpression(jc, "foo != null", Boolean.FALSE);
504         assertExpression(jc, "empty(bar)", Boolean.FALSE);
505         assertExpression(jc, "empty(foo)", Boolean.TRUE);
506     }
507
508     /**
509       * test some blank strings
510       */
511     public void testBlankStrings()
512          throws Exception
513     {
514         JexlContext jc = JexlHelper.createContext();
515         jc.getVars().put("bar", "" );
516
517         assertExpression(jc, "foo == ''", Boolean.FALSE);
518         assertExpression(jc, "bar == ''", Boolean.TRUE);
519         assertExpression(jc, "barnotexist == ''", Boolean.FALSE);
520         assertExpression(jc, "empty bar", Boolean.TRUE);
521         assertExpression(jc, "bar.length() == 0", Boolean.TRUE);
522         assertExpression(jc, "size(bar) == 0", Boolean.TRUE);
523     }
524
525     /**
526       * test some blank strings
527       */
528     public void testLogicExpressions()
529          throws Exception
530     {
531         JexlContext jc = JexlHelper.createContext();
532         jc.getVars().put("foo", "abc" );
533         jc.getVars().put("bar", "def" );
534
535         assertExpression(jc, "foo == 'abc' || bar == 'abc'", Boolean.TRUE);
536         assertExpression(jc, "foo == 'abc' or bar == 'abc'", Boolean.TRUE);
537         assertExpression(jc, "foo == 'abc' && bar == 'abc'", Boolean.FALSE);
538         assertExpression(jc, "foo == 'abc' and bar == 'abc'", Boolean.FALSE);
539
540         assertExpression(jc, "foo == 'def' || bar == 'abc'", Boolean.FALSE);
541         assertExpression(jc, "foo == 'def' or bar == 'abc'", Boolean.FALSE);
542         assertExpression(jc, "foo == 'abc' && bar == 'def'", Boolean.TRUE);
543         assertExpression(jc, "foo == 'abc' and bar == 'def'", Boolean.TRUE);
544     }
545
546
547     /**
548       * test some simple double array lookups
549       */
550     public void testDoubleArrays()
551          throws Exception
552     {
553         JexlContext jc = JexlHelper.createContext();
554
555         Object [][] foo = new Object [2][2];
556         foo[0][0] = "one";
557         foo[0][1] = "two";
558
559         jc.getVars().put("foo", foo );
560
561         assertExpression(jc, "foo[0][1]", "two");
562     }
563
564     /**
565       * test variables with underscore names
566       */
567     public void testVariableNames()
568          throws Exception
569     {
570         JexlContext jc = JexlHelper.createContext();
571         jc.getVars().put("foo_bar", "123" );
572         
573         assertExpression(jc, "foo_bar", "123");
574     }
575
576     /**
577       * test the use of dot notation to lookup map entries
578       */
579     public void testMapDot()
580          throws Exception
581     {
582         Map foo = new HashMap ();
583         foo.put( "bar", "123" );
584
585         JexlContext jc = JexlHelper.createContext();
586         jc.getVars().put("foo", foo );
587         
588         assertExpression(jc, "foo.bar", "123");
589     }
590
591     /**
592      * Tests string literals
593      */
594     public void testStringLiterals()
595         throws Exception
596     {
597         JexlContext jc = JexlHelper.createContext();
598         jc.getVars().put("foo", "bar" );
599
600         assertExpression(jc, "foo == \"bar\"", Boolean.TRUE);
601         assertExpression(jc, "foo == 'bar'", Boolean.TRUE);
602     }
603
604     /**
605       * test the use of an int based property
606       */
607     public void testIntProperty()
608          throws Exception
609     {
610         Foo foo = new Foo();
611
612         // lets check the square function first..
613 assertEquals(4, foo.square(2));
614         assertEquals(4, foo.square(-2));
615
616         JexlContext jc = JexlHelper.createContext();
617         jc.getVars().put("foo", foo );
618
619         assertExpression(jc, "foo.count", new Integer (5));
620         assertExpression(jc, "foo.square(2)", new Integer (4));
621         assertExpression(jc, "foo.square(-2)", new Integer (4));
622     }
623
624     /**
625       * test the -1 comparison bug
626       */
627     public void testNegativeIntComparison()
628          throws Exception
629     {
630         JexlContext jc = JexlHelper.createContext();
631         Foo foo = new Foo();
632         jc.getVars().put("foo", foo );
633
634         assertExpression(jc, "foo.count != -1", Boolean.TRUE);
635         assertExpression(jc, "foo.count == 5", Boolean.TRUE);
636         assertExpression(jc, "foo.count == -1", Boolean.FALSE);
637     }
638
639     public void testArrayProperty()
640         throws Exception
641     {
642         Foo foo = new Foo();
643
644         JexlContext jc = JexlHelper.createContext();
645         jc.getVars().put("foo", foo );
646
647         Expression bracketForm =
648             ExpressionFactory.createExpression("foo.array[1]");
649
650         Expression dotForm =
651             ExpressionFactory.createExpression("foo.array.1");
652
653         assertExpression(jc, "foo.array[1]", GET_METHOD_ARRAY[1]);
654         assertExpression(jc, "foo.array.1", GET_METHOD_ARRAY[1]);
655         assertExpression(jc, "foo.array2[1][1]", GET_METHOD_ARRAY2[1][1]);
656         //assertExpression(jc, "foo.array2.1.1", GET_METHOD_ARRAY2[1][1]);
657 }
658
659     /**
660      * Attempts to recreate bug http://jira.werken.com/ViewIssue.jspa?key=JELLY-8
661      */
662     public void testCharAtBug()
663         throws Exception
664     {
665         JexlContext jc = JexlHelper.createContext();
666
667         jc.getVars().put("foo", "abcdef");
668
669         assertExpression(jc, "foo.substring(2,4)", "cd");
670         assertExpression(jc, "foo.charAt(2)", new Character ('c'));
671
672         try {
673             assertExpression(jc, "foo.charAt(-2)", null);
674             fail("this test should have thrown an exception" );
675         }
676         catch (IndexOutOfBoundsException e) {
677             // expected behaviour
678 }
679         catch (Exception e) {
680             throw e;
681         }
682     }
683
684     public void testEmptyDottedVariableName() throws Exception
685     {
686         JexlContext jc = JexlHelper.createContext();
687
688         jc.getVars().put( "this.is.a.test", "");
689
690         assertExpression(jc, "empty(this.is.a.test)", Boolean.TRUE);
691     }
692
693     public void testEmptySubListOfMap() throws Exception
694     {
695         JexlContext jc = JexlHelper.createContext();
696         Map m = Collections.singletonMap("aList", Collections.EMPTY_LIST);
697
698         jc.getVars().put( "aMap", m );
699
700         assertExpression( jc, "empty( aMap.aList )", Boolean.TRUE );
701     }
702
703     public void testCoercionWithComparisionOperators()
704         throws Exception
705     {
706         JexlContext jc = JexlHelper.createContext();
707
708         assertExpression(jc, "'2' > 1", Boolean.TRUE);
709         assertExpression(jc, "'2' >= 1", Boolean.TRUE);
710         assertExpression(jc, "'2' >= 2", Boolean.TRUE);
711         assertExpression(jc, "'2' < 1", Boolean.FALSE);
712         assertExpression(jc, "'2' <= 1", Boolean.FALSE);
713         assertExpression(jc, "'2' <= 2", Boolean.TRUE);
714
715         assertExpression(jc, "2 > '1'", Boolean.TRUE);
716         assertExpression(jc, "2 >= '1'", Boolean.TRUE);
717         assertExpression(jc, "2 >= '2'", Boolean.TRUE);
718         assertExpression(jc, "2 < '1'", Boolean.FALSE);
719         assertExpression(jc, "2 <= '1'", Boolean.FALSE);
720         assertExpression(jc, "2 <= '2'", Boolean.TRUE);
721 }
722
723     public void testResolver()
724         throws Exception
725     {
726         /*
727          * first, a simple override
728          */
729
730         Expression expr =
731             ExpressionFactory.createExpression("foo.bar");
732
733         expr.addPreResolver(new FlatResolver());
734
735         JexlContext jc = JexlHelper.createContext();
736
737         Foo foo = new Foo();
738
739         jc.getVars().put("foo.bar", "flat value");
740         jc.getVars().put("foo", foo );
741
742         Object o = expr.evaluate(jc);
743
744         assertEquals("flat override", o,"flat value");
745
746         /*
747          * now, let the resolver not find it and have it drop to jexl
748          */
749
750         expr =
751             ExpressionFactory.createExpression("foo.bar.length()");
752
753         expr.addPreResolver(new FlatResolver());
754
755         o = expr.evaluate(jc);
756
757         assertEquals("flat override 1", o,new Integer (GET_METHOD_STRING.length()));
758
759         /*
760          * now, let the resolver not find it and NOT drop to jexl
761          */
762
763         expr =
764             ExpressionFactory.createExpression("foo.bar.length()");
765
766         expr.addPreResolver(new FlatResolver(false));
767
768         o = expr.evaluate(jc);
769
770         assertEquals("flat override 2", o, null);
771
772     }
773
774     /**
775      * Test that 'and' only evaluates the second item if needed
776      * @throws Exception if there are errors
777      */
778     public void testBooleanShortCircuitAnd() throws Exception
779     {
780         // handle false for the left arg of 'and'
781 Foo tester = new Foo();
782         JexlContext jc = JexlHelper.createContext();
783         jc.getVars().put("first", Boolean.FALSE);
784         jc.getVars().put("foo", tester);
785         Expression expr = ExpressionFactory.createExpression("first and foo.trueAndModify");
786         expr.evaluate(jc);
787         assertTrue("Short circuit failure: rhs evaluated when lhs FALSE", !tester.getModified());
788         // handle true for the left arg of 'and'
789 tester = new Foo();
790         jc.getVars().put("first", Boolean.TRUE);
791         jc.getVars().put("foo", tester);
792         expr.evaluate(jc);
793         assertTrue("Short circuit failure: rhs not evaluated when lhs TRUE", tester.getModified());
794     }
795     
796     /**
797      * Test that 'or' only evaluates the second item if needed
798      * @throws Exception if there are errors
799      */
800     public void testBooleanShortCircuitOr() throws Exception
801     {
802         // handle false for the left arg of 'or'
803 Foo tester = new Foo();
804         JexlContext jc = JexlHelper.createContext();
805         jc.getVars().put("first", Boolean.FALSE);
806         jc.getVars().put("foo", tester);
807         Expression expr = ExpressionFactory.createExpression("first or foo.trueAndModify");
808         expr.evaluate(jc);
809         assertTrue("Short circuit failure: rhs not evaluated when lhs FALSE", tester.getModified());
810         // handle true for the left arg of 'or'
811 tester = new Foo();
812         jc.getVars().put("first", Boolean.TRUE);
813         jc.getVars().put("foo", tester);
814         expr.evaluate(jc);
815         assertTrue("Short circuit failure: rhs evaluated when lhs TRUE", !tester.getModified());
816     }
817
818     /**
819      * Simple test of '+' as a string concatenation operator
820      * @throws Exception
821      */
822     public void testStringConcatenation() throws Exception
823     {
824         JexlContext jc = JexlHelper.createContext();
825         jc.getVars().put("first", "Hello");
826         jc.getVars().put("second", "World");
827         assertExpression(jc, "first + ' ' + second", "Hello World");
828     }
829
830     /**
831      * Ensures static methods on objects can be called.
832      */
833     public void testStaticMethodInvocation() throws Exception
834     {
835         JexlContext jc = JexlHelper.createContext();
836         jc.getVars().put("aBool", Boolean.FALSE);
837         assertExpression(jc, "aBool.valueOf('true')", Boolean.TRUE);
838     }
839     
840     /**
841      * Make sure bad syntax throws ParseException
842      * @throws Exception on errors
843      */
844     public void testBadParse() throws Exception
845     {
846         try
847         {
848             assertExpression(JexlHelper.createContext(), "empty()", null);
849         }
850         catch (ParseException pe)
851         {
852             System.err.println("Expecting a parse exception: " + pe.getMessage());
853         }
854     }
855
856     /**
857      * Test the ## comment in a string
858      * @throws Exception
859      */
860     public void testComment() throws Exception
861     {
862         assertExpression(JexlHelper.createContext(), "## double or nothing\n 1 + 1", Long.valueOf("2"));
863     }
864     
865     /**
866      * Assignment isn't implemented for an expression language
867      * @throws Exception
868      */
869     public void testAssignment() throws Exception
870     {
871         JexlContext jc = JexlHelper.createContext();
872         jc.getVars().put("aString", "Hello");
873         Parser parser = new Parser(new StringReader (";"));
874         SimpleNode tree = parser.parse(new StringReader ("aString = 'World';"));
875     }
876     
877     public void testAntPropertiesWithMethods() throws Exception
878     {
879         JexlContext jc = JexlHelper.createContext();
880         String value = "Stinky Cheese";
881         jc.getVars().put("maven.bob.food", value);
882         assertExpression(jc, "maven.bob.food.length()", new Integer (value.length()));
883         assertExpression(jc, "empty(maven.bob.food)", Boolean.FALSE);
884         assertExpression(jc, "size(maven.bob.food)", new Integer (value.length()));
885         assertExpression(jc, "maven.bob.food + ' is good'", value + " is good");
886
887         // DG: Note the following ant properties don't work
888 // String version = "1.0.3";
889 // jc.getVars().put("commons-logging", version);
890 // assertExpression(jc, "commons-logging", version);
891 }
892
893     /**
894      * Asserts that the given expression returns the given value when applied to the
895      * given context
896      */
897     protected void assertExpression(JexlContext jc, String expression, Object expected) throws Exception
898     {
899         Expression e = ExpressionFactory.createExpression(expression);
900         Object actual = e.evaluate(jc);
901         assertEquals(expression, expected, actual);
902     }
903
904
905     /**
906      * Helps in debugging the testcases when working with it
907      *
908      */
909     public static void main(String [] args)
910         throws Exception
911     {
912         JexlTest jt = new JexlTest("foo");
913         jt.testEmpty();
914     }
915
916 }
917

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