001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.util;
018
019 import java.io.Closeable;
020 import java.io.IOException;
021 import java.io.InputStream;
022 import java.lang.annotation.Annotation;
023 import java.lang.reflect.AnnotatedElement;
024 import java.lang.reflect.InvocationTargetException;
025 import java.lang.reflect.Method;
026 import java.nio.charset.Charset;
027 import java.util.ArrayList;
028 import java.util.Arrays;
029 import java.util.Collection;
030 import java.util.Collections;
031 import java.util.Iterator;
032 import java.util.List;
033 import java.util.Scanner;
034
035 import org.w3c.dom.Node;
036 import org.w3c.dom.NodeList;
037
038
039 import org.apache.camel.RuntimeCamelException;
040 import org.apache.commons.logging.Log;
041 import org.apache.commons.logging.LogFactory;
042
043
044 /**
045 * A number of useful helper methods for working with Objects
046 *
047 * @version $Revision: 14157 $
048 */
049 public final class ObjectHelper {
050 private static final transient Log LOG = LogFactory.getLog(ObjectHelper.class);
051
052 /**
053 * Utility classes should not have a public constructor.
054 */
055 private ObjectHelper() {
056 }
057
058 /**
059 * @deprecated use the equal method instead. Will be removed in Camel 2.0.
060 *
061 * @see #equal(Object, Object)
062 */
063 @Deprecated
064 public static boolean equals(Object a, Object b) {
065 return equal(a, b);
066 }
067
068 /**
069 * A helper method for comparing objects for equality while handling nulls
070 */
071 public static boolean equal(Object a, Object b) {
072 if (a == b) {
073 return true;
074 }
075
076 if (a instanceof byte[] && b instanceof byte[]) {
077 return equalByteArray((byte[]) a, (byte[]) b);
078 }
079
080 return a != null && b != null && a.equals(b);
081 }
082
083 /**
084 * A helper method for comparing byte arrays for equality while handling nulls
085 */
086 public static boolean equalByteArray(byte[] a, byte[] b) {
087 if (a == b) {
088 return true;
089 }
090
091 // loop and compare each byte
092 if (a != null && b != null && a.length == b.length) {
093 for (int i = 0; i < a.length; i++) {
094 if (a[i] != b[i]) {
095 return false;
096 }
097 }
098 // all bytes are equal
099 return true;
100 }
101
102 return false;
103 }
104
105 /**
106 * Returns true if the given object is equal to any of the expected value
107 */
108 public static boolean isEqualToAny(Object object, Object... values) {
109 for (Object value : values) {
110 if (equal(object, value)) {
111 return true;
112 }
113 }
114 return false;
115 }
116
117 /**
118 * A helper method for performing an ordered comparison on the objects
119 * handling nulls and objects which do not handle sorting gracefully
120 */
121 public static int compare(Object a, Object b) {
122 if (a == b) {
123 return 0;
124 }
125 if (a == null) {
126 return -1;
127 }
128 if (b == null) {
129 return 1;
130 }
131 if (a instanceof Comparable) {
132 Comparable comparable = (Comparable)a;
133 return comparable.compareTo(b);
134 } else {
135 int answer = a.getClass().getName().compareTo(b.getClass().getName());
136 if (answer == 0) {
137 answer = a.hashCode() - b.hashCode();
138 }
139 return answer;
140 }
141 }
142
143 public static Boolean toBoolean(Object value) {
144 if (value instanceof Boolean) {
145 return (Boolean)value;
146 }
147 if (value instanceof String) {
148 return "true".equalsIgnoreCase(value.toString()) ? Boolean.TRUE : Boolean.FALSE;
149 }
150 if (value instanceof Integer) {
151 return (Integer)value > 0 ? Boolean.TRUE : Boolean.FALSE;
152 }
153 return null;
154 }
155
156 /**
157 * Asserts whether the value is <b>not</b> <tt>null</tt>
158 *
159 * @param value the value to test
160 * @param name the key that resolved the value
161 * @throws IllegalArgumentException is thrown if assertion fails
162 */
163 public static void notNull(Object value, String name) {
164 if (value == null) {
165 throw new IllegalArgumentException(name + " must be specified");
166 }
167 }
168
169 /**
170 * Asserts whether the value is <b>not</b> <tt>null</tt>
171 *
172 * @param value the value to test
173 * @param on additional description to indicate where this problem occured (appended as toString())
174 * @param name the key that resolved the value
175 * @throws IllegalArgumentException is thrown if assertion fails
176 */
177 public static void notNull(Object value, String name, Object on) {
178 if (on == null) {
179 notNull(value, name);
180 } else if (value == null) {
181 throw new IllegalArgumentException(name + " must be specified on: " + on);
182 }
183 }
184
185 /**
186 * Asserts whether the string is <b>not</b> empty.
187 *
188 * @param value the string to test
189 * @param name the key that resolved the value
190 * @throws IllegalArgumentException is thrown if assertion fails
191 */
192 public static void notEmpty(String value, String name) {
193 if (isEmpty(value)) {
194 throw new IllegalArgumentException(name + " must be specified and not empty");
195 }
196 }
197
198 /**
199 * Asserts whether the string is <b>not</b> empty.
200 *
201 * @param value the string to test
202 * @param on additional description to indicate where this problem occured (appended as toString())
203 * @param name the key that resolved the value
204 * @throws IllegalArgumentException is thrown if assertion fails
205 */
206 public static void notEmpty(String value, String name, Object on) {
207 if (on == null) {
208 notNull(value, name);
209 } else if (isEmpty(value)) {
210 throw new IllegalArgumentException(name + " must be specified and not empty on: " + on);
211 }
212 }
213
214 public static String[] splitOnCharacter(String value, String needle, int count) {
215 String rc[] = new String[count];
216 rc[0] = value;
217 for (int i = 1; i < count; i++) {
218 String v = rc[i - 1];
219 int p = v.indexOf(needle);
220 if (p < 0) {
221 return rc;
222 }
223 rc[i - 1] = v.substring(0, p);
224 rc[i] = v.substring(p + 1);
225 }
226 return rc;
227 }
228
229 /**
230 * Removes any starting characters on the given text which match the given
231 * character
232 *
233 * @param text the string
234 * @param ch the initial characters to remove
235 * @return either the original string or the new substring
236 */
237 public static String removeStartingCharacters(String text, char ch) {
238 int idx = 0;
239 while (text.charAt(idx) == ch) {
240 idx++;
241 }
242 if (idx > 0) {
243 return text.substring(idx);
244 }
245 return text;
246 }
247
248 public static String capitalize(String text) {
249 if (text == null) {
250 return null;
251 }
252 int length = text.length();
253 if (length == 0) {
254 return text;
255 }
256 String answer = text.substring(0, 1).toUpperCase();
257 if (length > 1) {
258 answer += text.substring(1, length);
259 }
260 return answer;
261 }
262
263
264 /**
265 * Returns true if the collection contains the specified value
266 */
267 @SuppressWarnings("unchecked")
268 public static boolean contains(Object collectionOrArray, Object value) {
269 if (collectionOrArray instanceof Collection) {
270 Collection collection = (Collection)collectionOrArray;
271 return collection.contains(value);
272 } else if (collectionOrArray instanceof String && value instanceof String) {
273 String str = (String) collectionOrArray;
274 String subStr = (String) value;
275 return str.contains(subStr);
276 } else {
277 Iterator iter = createIterator(collectionOrArray);
278 while (iter.hasNext()) {
279 if (equal(value, iter.next())) {
280 return true;
281 }
282 }
283 }
284 return false;
285 }
286
287 /**
288 * Creates an iterator over the value if the value is a collection, an
289 * Object[] or a primitive type array; otherwise to simplify the caller's
290 * code, we just create a singleton collection iterator over a single value
291 */
292 @SuppressWarnings("unchecked")
293 public static Iterator createIterator(Object value) {
294 if (value == null) {
295 return Collections.EMPTY_LIST.iterator();
296 } else if (value instanceof Iterator) {
297 return (Iterator) value;
298 } else if (value instanceof Collection) {
299 Collection collection = (Collection)value;
300 return collection.iterator();
301 } else if (value.getClass().isArray()) {
302 // TODO we should handle primitive array types?
303 List<Object> list = Arrays.asList((Object[]) value);
304 return list.iterator();
305 } else if (value instanceof NodeList) {
306 // lets iterate through DOM results after performing XPaths
307 final NodeList nodeList = (NodeList) value;
308 return new Iterator<Node>() {
309 int idx = -1;
310
311 public boolean hasNext() {
312 return ++idx < nodeList.getLength();
313 }
314
315 public Node next() {
316 return nodeList.item(idx);
317 }
318
319 public void remove() {
320 throw new UnsupportedOperationException();
321 }
322 };
323 } else if (value instanceof String) {
324 final String s = (String) value;
325
326 // this code is optimized to only use a Scanner if needed, eg there is a delimiter
327
328 if (s.contains(",")) {
329 // use a scanner if it contains the delimtor
330 Scanner scanner = new Scanner((String)value);
331 scanner.useDelimiter(",");
332 return scanner;
333 } else {
334 // use a plain iterator that returns the value as is as there are only a single value
335 return new Iterator<String>() {
336 int idx = -1;
337
338 public boolean hasNext() {
339 // empty string should not be regarded as having next
340 return ++idx == 0 && ObjectHelper.isNotEmpty(s);
341 }
342
343 public String next() {
344 return s;
345 }
346
347 public void remove() {
348 throw new UnsupportedOperationException();
349 }
350 };
351 }
352 } else {
353 return Collections.singletonList(value).iterator();
354 }
355 }
356
357 /**
358 * Returns the predicate matching boolean on a {@link List} result set where
359 * if the first element is a boolean its value is used otherwise this method
360 * returns true if the collection is not empty
361 *
362 * @return <tt>true</tt> if the first element is a boolean and its value is true or
363 * if the list is non empty
364 */
365 public static boolean matches(List list) {
366 if (!list.isEmpty()) {
367 Object value = list.get(0);
368 if (value instanceof Boolean) {
369 Boolean flag = (Boolean)value;
370 return flag.booleanValue();
371 } else {
372 // lets assume non-empty results are true
373 return true;
374 }
375 }
376 return false;
377 }
378
379 /**
380 * @deprecated will be removed in Camel 2.0 - use isNotEmpty() instead
381 */
382 public static boolean isNotNullAndNonEmpty(String text) {
383 return isNotEmpty(text);
384 }
385
386 /**
387 * @deprecated will be removed in Camel 2.0 - use isEmpty() instead
388 */
389 public static boolean isNullOrBlank(String text) {
390 return isEmpty(text);
391 }
392
393 /**
394 * Tests whether the value is <tt>null</tt> or an empty string.
395 *
396 * @param value the value, if its a String it will be tested for text length as well
397 * @return true if empty
398 */
399 public static boolean isEmpty(Object value) {
400 return !isNotEmpty(value);
401 }
402
403 /**
404 * Tests whether the value is <b>not</b> <tt>null</tt> or an empty string.
405 *
406 * @param value the value, if its a String it will be tested for text length as well
407 * @return true if <b>not</b> empty
408 */
409 public static boolean isNotEmpty(Object value) {
410 if (value == null) {
411 return false;
412 } else if (value instanceof String) {
413 String text = (String) value;
414 return text.trim().length() > 0;
415 } else {
416 return true;
417 }
418 }
419
420 /**
421 * A helper method to access a system property, catching any security
422 * exceptions
423 *
424 * @param name the name of the system property required
425 * @param defaultValue the default value to use if the property is not
426 * available or a security exception prevents access
427 * @return the system property value or the default value if the property is
428 * not available or security does not allow its access
429 */
430 public static String getSystemProperty(String name, String defaultValue) {
431 try {
432 return System.getProperty(name, defaultValue);
433 } catch (Exception e) {
434 if (LOG.isDebugEnabled()) {
435 LOG.debug("Caught security exception accessing system property: " + name + ". Reason: " + e,
436 e);
437 }
438 return defaultValue;
439 }
440 }
441
442 /**
443 * A helper method to access a boolean system property, catching any security
444 * exceptions
445 *
446 * @param name the name of the system property required
447 * @param defaultValue the default value to use if the property is not
448 * available or a security exception prevents access
449 * @return the boolean representation of the system property value
450 * or the default value if the property is not available or
451 * security does not allow its access
452 */
453 public static boolean getSystemProperty(String name, Boolean defaultValue) {
454 String result = getSystemProperty(name, defaultValue.toString());
455 return Boolean.parseBoolean(result);
456 }
457
458 /**
459 * Returns the type name of the given type or null if the type variable is
460 * null
461 */
462 public static String name(Class type) {
463 return type != null ? type.getName() : null;
464 }
465
466 /**
467 * Returns the type name of the given value
468 */
469 public static String className(Object value) {
470 return name(value != null ? value.getClass() : null);
471 }
472
473 /**
474 * Returns the canonical type name of the given value
475 */
476 public static String classCanonicalName(Object value) {
477 if (value != null) {
478 return value.getClass().getCanonicalName();
479 } else {
480 return null;
481 }
482 }
483
484 /**
485 * Attempts to load the given class name using the thread context class
486 * loader or the class loader used to load this class
487 *
488 * @param name the name of the class to load
489 * @return the class or null if it could not be loaded
490 */
491 public static Class<?> loadClass(String name) {
492 return loadClass(name, ObjectHelper.class.getClassLoader());
493 }
494
495 /**
496 * Attempts to load the given class name using the thread context class
497 * loader or the given class loader
498 *
499 * @param name the name of the class to load
500 * @param loader the class loader to use after the thread context class
501 * loader
502 * @return the class or null if it could not be loaded
503 */
504 public static Class<?> loadClass(String name, ClassLoader loader) {
505 // must clean the name so its pure java name, eg remoing \n or whatever people can do in the Spring XML
506 name = normalizeClassName(name);
507
508 // special for byte[] as its common to use
509 if ("java.lang.byte[]".equals(name) || "byte[]".equals(name)) {
510 return byte[].class;
511 }
512
513 // try context class loader first
514 Class clazz = doLoadClass(name, Thread.currentThread().getContextClassLoader());
515 if (clazz == null) {
516 // then the provided loader
517 clazz = doLoadClass(name, loader);
518 }
519 if (clazz == null) {
520 // and fallback to the loader the loaded the ObjectHelper class
521 clazz = doLoadClass(name, ObjectHelper.class.getClassLoader());
522 }
523
524 if (clazz == null) {
525 LOG.warn("Could not find class: " + name);
526 }
527
528 return clazz;
529 }
530
531 /**
532 * Loads the given class with the provided classloader (may be null).
533 * Will ignore any class not found and return null.
534 *
535 * @param name the name of the class to load
536 * @param loader a provided loader (may be null)
537 * @return the class, or null if it could not be loaded
538 */
539 private static Class<?> doLoadClass(String name, ClassLoader loader) {
540 ObjectHelper.notEmpty(name, "name");
541 if (loader == null) {
542 return null;
543 }
544 try {
545 return loader.loadClass(name);
546 } catch (ClassNotFoundException e) {
547 if (LOG.isTraceEnabled()) {
548 LOG.trace("Can not load class: " + name + " using classloader: " + loader, e);
549 }
550
551 }
552 return null;
553 }
554
555 /**
556 * Attempts to load the given resource as a stream using the thread context class
557 * loader or the class loader used to load this class
558 *
559 * @param name the name of the resource to load
560 * @return the stream or null if it could not be loaded
561 */
562 public static InputStream loadResourceAsStream(String name) {
563 InputStream in = null;
564
565 ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
566 if (contextClassLoader != null) {
567 in = contextClassLoader.getResourceAsStream(name);
568 }
569 if (in == null) {
570 in = ObjectHelper.class.getClassLoader().getResourceAsStream(name);
571 }
572
573 return in;
574 }
575
576 /**
577 * A helper method to invoke a method via reflection and wrap any exceptions
578 * as {@link RuntimeCamelException} instances
579 *
580 * @param method the method to invoke
581 * @param instance the object instance (or null for static methods)
582 * @param parameters the parameters to the method
583 * @return the result of the method invocation
584 */
585 public static Object invokeMethod(Method method, Object instance, Object... parameters) {
586 try {
587 return method.invoke(instance, parameters);
588 } catch (IllegalAccessException e) {
589 throw new RuntimeCamelException(e);
590 } catch (InvocationTargetException e) {
591 throw new RuntimeCamelException(e.getCause());
592 }
593 }
594
595 /**
596 * Returns a list of methods which are annotated with the given annotation
597 *
598 * @param type the type to reflect on
599 * @param annotationType the annotation type
600 * @return a list of the methods found
601 */
602 public static List<Method> findMethodsWithAnnotation(Class<?> type,
603 Class<? extends Annotation> annotationType) {
604 return findMethodsWithAnnotation(type, annotationType, false);
605 }
606
607 /**
608 * Returns a list of methods which are annotated with the given annotation
609 *
610 * @param type the type to reflect on
611 * @param annotationType the annotation type
612 * @param checkMetaAnnotations check for meta annotations
613 * @return a list of the methods found
614 */
615 public static List<Method> findMethodsWithAnnotation(Class<?> type,
616 Class<? extends Annotation> annotationType, boolean checkMetaAnnotations) {
617 List<Method> answer = new ArrayList<Method>();
618 do {
619 Method[] methods = type.getDeclaredMethods();
620 for (Method method : methods) {
621 if (hasAnnotation(method, annotationType, checkMetaAnnotations)) {
622 answer.add(method);
623 }
624 }
625 type = type.getSuperclass();
626 } while (type != null);
627 return answer;
628 }
629
630 /**
631 * Checks if a Class or Method are annotated with the given annotation
632 *
633 * @param elem the Class or Method to reflect on
634 * @param annotationType the annotation type
635 * @param checkMetaAnnotations check for meta annotations
636 * @return true if annotations is present
637 */
638 public static boolean hasAnnotation(AnnotatedElement elem,
639 Class<? extends Annotation> annotationType, boolean checkMetaAnnotations) {
640 if (elem.isAnnotationPresent(annotationType)) {
641 return true;
642 }
643 if (checkMetaAnnotations) {
644 for (Annotation a : elem.getAnnotations()) {
645 for (Annotation meta : a.annotationType().getAnnotations()) {
646 if (meta.annotationType().getName().equals(annotationType.getName())) {
647 return true;
648 }
649 }
650 }
651 }
652 return false;
653 }
654
655 /**
656 * Turns the given object arrays into a meaningful string
657 *
658 * @param objects an array of objects or null
659 * @return a meaningful string
660 */
661 public static String asString(Object[] objects) {
662 if (objects == null) {
663 return "null";
664 } else {
665 StringBuffer buffer = new StringBuffer("{");
666 int counter = 0;
667 for (Object object : objects) {
668 if (counter++ > 0) {
669 buffer.append(", ");
670 }
671 String text = (object == null) ? "null" : object.toString();
672 buffer.append(text);
673 }
674 buffer.append("}");
675 return buffer.toString();
676 }
677 }
678
679 /**
680 * Returns true if a class is assignable from another class like the
681 * {@link Class#isAssignableFrom(Class)} method but which also includes
682 * coercion between primitive types to deal with Java 5 primitive type
683 * wrapping
684 */
685 public static boolean isAssignableFrom(Class a, Class b) {
686 a = convertPrimitiveTypeToWrapperType(a);
687 b = convertPrimitiveTypeToWrapperType(b);
688 return a.isAssignableFrom(b);
689 }
690
691 /**
692 * Converts primitive types such as int to its wrapper type like
693 * {@link Integer}
694 */
695 public static Class convertPrimitiveTypeToWrapperType(Class type) {
696 Class rc = type;
697 if (type.isPrimitive()) {
698 if (type == int.class) {
699 rc = Integer.class;
700 } else if (type == long.class) {
701 rc = Long.class;
702 } else if (type == double.class) {
703 rc = Double.class;
704 } else if (type == float.class) {
705 rc = Float.class;
706 } else if (type == short.class) {
707 rc = Short.class;
708 } else if (type == byte.class) {
709 rc = Byte.class;
710 // TODO: Why is boolean disabled
711 /*
712 } else if (type == boolean.class) {
713 rc = Boolean.class;
714 */
715 }
716 }
717 return rc;
718 }
719
720 /**
721 * Helper method to return the default character set name
722 */
723 public static String getDefaultCharacterSet() {
724 return Charset.defaultCharset().name();
725 }
726
727 /**
728 * Returns the Java Bean property name of the given method, if it is a setter
729 */
730 public static String getPropertyName(Method method) {
731 String propertyName = method.getName();
732 if (propertyName.startsWith("set") && method.getParameterTypes().length == 1) {
733 propertyName = propertyName.substring(3, 4).toLowerCase() + propertyName.substring(4);
734 }
735 return propertyName;
736 }
737
738 /**
739 * Returns true if the given collection of annotations matches the given type
740 */
741 public static boolean hasAnnotation(Annotation[] annotations, Class<?> type) {
742 for (Annotation annotation : annotations) {
743 if (type.isInstance(annotation)) {
744 return true;
745 }
746 }
747 return false;
748 }
749
750 /**
751 * Closes the given resource if it is available, logging any closing exceptions to the given log
752 *
753 * @param closeable the object to close
754 * @param name the name of the resource
755 * @param log the log to use when reporting closure warnings
756 */
757 public static void close(Closeable closeable, String name, Log log) {
758 if (closeable != null) {
759 try {
760 closeable.close();
761 } catch (IOException e) {
762 if (log != null) {
763 log.warn("Could not close: " + name + ". Reason: " + e, e);
764 }
765 }
766 }
767 }
768
769 /**
770 * Converts the given value to the required type or throw a meaningful exception
771 */
772 public static <T> T cast(Class<T> toType, Object value) {
773 if (toType == boolean.class) {
774 return (T)cast(Boolean.class, value);
775 } else if (toType.isPrimitive()) {
776 Class newType = convertPrimitiveTypeToWrapperType(toType);
777 if (newType != toType) {
778 return (T)cast(newType, value);
779 }
780 }
781 try {
782 return toType.cast(value);
783 } catch (ClassCastException e) {
784 throw new IllegalArgumentException("Failed to convert: " + value + " to type: "
785 + toType.getName() + " due to: " + e, e);
786 }
787 }
788
789 /**
790 * A helper method to create a new instance of a type using the default constructor arguments.
791 */
792 public static <T> T newInstance(Class<T> type) {
793 try {
794 return type.newInstance();
795 } catch (InstantiationException e) {
796 throw new RuntimeCamelException(e);
797 } catch (IllegalAccessException e) {
798 throw new RuntimeCamelException(e);
799 }
800 }
801
802 /**
803 * A helper method to create a new instance of a type using the default constructor arguments.
804 */
805 public static <T> T newInstance(Class<?> actualType, Class<T> expectedType) {
806 try {
807 Object value = actualType.newInstance();
808 return cast(expectedType, value);
809 } catch (InstantiationException e) {
810 throw new RuntimeCamelException();
811 } catch (IllegalAccessException e) {
812 throw new RuntimeCamelException(e);
813 }
814 }
815
816 /**
817 * Returns true if the given name is a valid java identifier
818 */
819 public static boolean isJavaIdentifier(String name) {
820 if (name == null) {
821 return false;
822 }
823 int size = name.length();
824 if (size < 1) {
825 return false;
826 }
827 if (Character.isJavaIdentifierStart(name.charAt(0))) {
828 for (int i = 1; i < size; i++) {
829 if (!Character.isJavaIdentifierPart(name.charAt(i))) {
830 return false;
831 }
832 }
833 return true;
834 }
835 return false;
836 }
837
838 /**
839 * Returns the type of the given object or null if the value is null
840 */
841 public static Object type(Object bean) {
842 return bean != null ? bean.getClass() : null;
843 }
844
845 /**
846 * Evaluate the value as a predicate which attempts to convert the value to
847 * a boolean otherwise true is returned if the value is not null
848 */
849 public static boolean evaluateValuePredicate(Object value) {
850 if (value instanceof Boolean) {
851 Boolean aBoolean = (Boolean)value;
852 return aBoolean.booleanValue();
853 } else if (value instanceof String) {
854 if ("true".equals(value)) {
855 return true;
856 } else if ("false".equals(value)) {
857 return false;
858 }
859 }
860 return value != null;
861 }
862
863 /**
864 * Wraps the caused exception in a {@link RuntimeCamelException} if its not already such an exception.
865 *
866 * @param e the caused exception
867 * @return the wrapper exception
868 */
869 public static RuntimeCamelException wrapRuntimeCamelException(Throwable e) {
870 if (e instanceof RuntimeCamelException) {
871 // don't double wrap if already a RuntimeCamelException
872 return (RuntimeCamelException) e;
873 } else {
874 return new RuntimeCamelException(e);
875 }
876 }
877
878 /**
879 * Cleans the string to pure java identifier so we can use it for loading class names.
880 * <p/>
881 * Especially from Sping DSL people can have \n \t or other characters that otherwise
882 * would result in ClassNotFoundException
883 *
884 * @param name the class name
885 * @return normalized classname that can be load by a class loader.
886 */
887 public static String normalizeClassName(String name) {
888 StringBuffer sb = new StringBuffer(name.length());
889 for (char ch : name.toCharArray()) {
890 if (ch == '.' || ch == '[' || ch == ']' || Character.isJavaIdentifierPart(ch)) {
891 sb.append(ch);
892 }
893 }
894 return sb.toString();
895 }
896
897 public static String after(String text, String after) {
898 if (!text.contains(after)) {
899 return null;
900 }
901 return text.substring(text.indexOf(after) + after.length());
902 }
903
904 public static String before(String text, String before) {
905 if (!text.contains(before)) {
906 return null;
907 }
908 return text.substring(0, text.indexOf(before));
909 }
910
911 public static String between(String text, String after, String before) {
912 text = after(text, after);
913 if (text == null) {
914 return null;
915 }
916 return before(text, before);
917 }
918
919 }