Authors: | Laurent Goubet
Laurent Delaigue |
---|---|
Contact: | laurent.goubet@obeo.fr, laurent.delaigue@obeo.fr |
Copyright © 2009, 2010 Obeo™.
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Returns the first n characters of self, or self if its size is less than n.
examples:
Expression Result 'first operation'.first(8) 'first op' 'first operation'.first(-1) Ø
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Returns the index of substring r in self, or -1 if self contains no occurrence of r.
Important: String indexes start at 1. Consequently the last character's index in a string is equal to the string's length.
examples:
Expression Result 'index operation'.index('op') 7 'index operation'.index('i') 1 'index operation'.index('foo') -1
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Returns true if self consists only of alphabetical characters, false otherwise.
examples:
Expression Result 'isAlpha'.isAlpha() true 'isAlpha operation'.isAlpha() false (spaces are not alphabetical characters) 'isAlpha11'.isAlpha() false (digits are not alphabetical characters)
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Returns true if self consists only of alphanumeric characters, false otherwise.
examples:
Expression Result 'isAlphanum'.isAlphanum() true 'isAlphanum operation'.isAlphanum() false 'isAlphanum11'.isAlphanum() true
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Returns the last n characters of self, or self if its size is less than n.
examples:
Expression Result 'first operation'.last(8) 'peration' 'first operation'.last(40) 'first operation' 'first operation'.last(-1) Ø
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Returns an integer that is either negative, zero or positive depending on whether s1 is alphabetically less than, equal to or greater than self. Note that upper case letters come before lower case ones, so that 'AA' is closer to 'AC' than it is to 'Ab'.
examples:
Expression Result 'strcmp operation'.strstr('strcmp') 10 'strcmp operation'.strstr('strcmp operation') 0 'strcmp operation'.strstr('strtok') -17
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Searches for string r in self. Returns true if found, false otherwise.
examples:
Expression Result 'strstr operation'.strstr('ope') true 'strstr operation'.strstr('false') false
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Breaks self into a sequence of tokens, each of which delimited by any one of the characters in s1, and return the next element in this sequence. The parameter flag should be 0 when strtok is called for the first time and will reset the sequence, 1 subsequently so as to access the next element.
examples:
Expression Result 'strtok operation'.strtok('opz', 0) 'strt' 'strtok operation'.strtok('pn', 0) 'strtok o'
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Substitutes substring r in self by substring t and returns the resulting string. Will return self if it contains no occurrence of the substring r.
examples:
Expression Result 'substitute operation'.substitute('t', 'T') 'subsTiTuTe operaTion' 'foobar foobar foobar'.substitute('t', 'T') 'foobar foobar foobar'
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Creates a copy of self with its first character converted to lower case and returns it.
examples:
Expression Result 'ToLowerFirst operation'.toLowerFirst() 'toLowerFirst operation'
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Creates a copy of self with its first character converted to upper case and returns it.
examples:
Expression Result 'toUpperFirst operation'.toUpperFirst() 'ToUpperFirst operation'
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Converts the integer self to a string.
examples:
Expression Result 2009.toString() '2009'
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Converts the real self to a string.
examples:
Expression Result (-5.3).toString() '-5.3'
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Returns true if self contains the substring substring, false otherwise.
examples:
Expression Result 'contains operation'.contains('ins op') true 'contains operation'.contains('2009') false
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Returns true if self ends with the substring substring, false otherwise.
examples:
Expression Result 'endsWith operation'.endsWith('ation') true 'endsWith operation'.endsWith('endsWith') false 'anything'.endsWith('') true
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Returns true if self is equal to the string other ignoring case considerations, otherwise returns false. Two strings are considered equal ignoring case if they are of the same length and corresponding characters in the two strings are equal ignoring case.
examples:
Expression Result 'lowercase'.equalsIgnoreCase('LOWERCASE') true 'lowercase'.equalsIgnoreCase('lowercase') true 'lowercase'.equalsIgnoreCase('lowerCase') true 'lowercase'.equalsIgnoreCase('uppercase') false
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Returns the last index of substring r in self, or -1 if self contains no occurrence of r.
Important: String indexes start at 1. Consequently the last character's index in a string is equal to the string's length.
examples:
Expression Result 'index operation'.lastIndex('op') 7 'index operation'.lastIndex('o') 14
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Returns true if self matches the given regular expression pattern regex, false otherwise. The regex engine used is that of your runtime JDK. The given pattern is passed "as is" to the method matches of the java class String. For more about regular expressions, please refer to the JDK API documentation.
examples:
Expression Result 'characters and spaces'.matches('[\w\s]+') true 'characters and 3 digits'.matches('[\w\s]+') false
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Substitutes the first occurrence of substring substring in self by substring replacement and returns the resulting string. Returns self if it contains no occurrence of substring. Note that both substring and replacement are treated as regular expressions.
examples:
Expression Result 'replace operation'.replace('p', 'P') 'rePlace operation' 'repla ce operation'.replace('(\\w+)\\s*', '\\1') 'replace operation'
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Substitutes all substrings substring in self by substring replacement and returns the resulting string. Returns self if it contains no occurrence of substring. Note that both substring and replacement are treated as regular expressions.
examples:
Expression Result 'replaceAll operation'.replaceAll('p', 'P') 'rePlaceAll oPeration' 'Repla ce All Operation'.replaceAll('(\\w+)\\s*', '\\1') 'ReplaceAllOperation'
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Returns true if self starts with the substring substring, false otherwise.
examples:
Expression Result 'startsWith operation'.startsWith('star') true 'startsWith operation'.startsWith('ope') false 'anything'.startsWith('') true
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Substitutes all substrings substring in self by substring replacement and returns the resulting string. Returns self if it contains no occurrence of substring. Unlike the replaceAll operation, neither substring nor replacement are considered as regular expressions.
examples:
Expression Result 'substituteAll operation'.substituteAll('t', 'T') 'subsTiTuTeAll operaTion'
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Returns a substring of self, starting at startIndex (inclusive), until the end of self. Returns Ø when the startIndex is either negative, zero, or greater than self's length.
Important: String indexes start at 1. Consequently the last character's index in a string is equal to the string's length.
examples:
Expression Result 'short term'.substring(7) 'term' 'short term'.substring(-1) Ø 'short term'.substring(0) Ø 'short term'.substring(10) 'm' 'short term'.substring(11) Ø
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Returns a sequence containing all parts of self split around delimiters defined by the characters in String delim.
examples:
Expression Result 'tokenize operation'.tokenize('e') Sequence{'tok', 'niz', ' op', 'ration'} 'tokenize operation'.tokenize('i') Sequence{'token', 'ze operat', 'on'}
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Removes all leading and trailing white space characters (tabulation, space, line feed, ...) of self.
examples:
Expression Result ' trim operation '.trim() 'trim operation'
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All of the examples from this section are set in the context of this model (with root being an instance of Model as per the UML metamodel) :
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Returns a Sequence containing the full set of the receiver's ancestors.
examples:
Expression Result Class11.ancestors() Sequence{package11, package1, root} package11.ancestors() Sequence{package1, root}
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Returns the elements of the given type from the set of the receiver's ancestors as a Sequence. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result Class11.ancestors(Package) Sequence{package11, package1} package11.ancestors(Package) Sequence{package1}
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Returns the whole content tree of the receiver as a Sequence.
examples:
Expression Result root.eAllContents() Sequence{package1, package11, Class11, Class1a, Class1b, package2, Class2, aClas2} package1.eAllContents() Sequence{package11, Class11, Class1a, Class1b}
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Returns the elements of the given type from the whole content tree of the receiver as a Sequence. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result root.eAllContents(Class) Sequence{Class11, Class1a, Class1b, Class2} package1.eAllContents(Class) Sequence{Class11, Class1a, Class1b}
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Returns the first ancestor of the given type, i.e. the first ancestor for which oclIsKindOf(oclType) evaluates to true. The returned element is typed with the expected type (so there's no need to invoke oclAsType(oclType) on it).
Important: users of Acceleo 2.x should note that, contrary to what took place in acceleo 2.x, this operation never returns self even when self.oclIsKindOf(oclType) is true.
examples:
Expression Result Class11.eContainer(Package) package11 package11.eContainer(Package) package1 aClass2.eContainer(Package) package11
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Returns a sequence of the direct children of self that are of the given type, i.e. the direct children for which oclIsKindOf(oclType) evaluates to true. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result package1.eContents(Class) Sequence{Class1b, Class 1a}
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This will fetch the value of the feature named featureName on the current Object. Return type can as well be a collection as a single value.
examples:
Expression Result package1.eGet('packagedElement') Sequence{Class1b, Class1a, package11} package1.eGet('name') 'package1'
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Returns the set of all objects referencing self.
examples:
Expression Result Class2.eInverse() Sequence{aClass2} package11.eInverse() Sequence{}
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Returns the elements of the given type from the set of the inverse references of self. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result Class2.eInverse(Property) Sequence{aClass2} Class2.eInverse(Package) Sequence{}
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Returns a Sequence containing the full set of the receiver's following siblings.
examples:
Expression Result Class11.followingSiblings() Sequence{} Class1b.followingSiblings() Sequence{Class1a, package11}
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Returns the elements of the given type from the set of the receiver's following siblings as a Sequence. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result Class1b.followingSiblings(Package) Sequence{package11} Class1b.followingSiblings(Class) Sequence{Class1a} Class1a.followingSiblings(Class) Sequence{}
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Returns a Sequence containing the full set of the receiver's preceding siblings.
examples:
Expression Result package11.precedingSiblings() Sequence{Class1b, Class1a} Class11.precedingSiblings() Sequence{} Class1a.precedingSiblings() Sequence{Class1b}
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Returns the elements of the given type from the set of the receiver's preceding siblings as a Sequence. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result Class1a.precedingSiblings(Package) Sequence{} Class1a.precedingSiblings(Class) Sequence{Class1b}
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Returns a Sequence containing the full set of the receiver's siblings.
examples:
Expression Result Class11.siblings() Sequence{} Class1a.siblings() Sequence{package11, Class1b}
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Returns the elements of the given type from the set of the receiver's siblings as a Sequence. The returned sequence's elements are typed with the expected type (so there's no need to invoke oclAsType(oclType) on the sequence or its elements).
examples:
Expression Result Class11.siblings(Class) Sequence{} Class1a.siblings(Class) Sequence{Class1b}
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A note on properties: properties can be accessed only if they've been added through the API. For this purpose, a number of facilities is provided. You can either override the generated launcher's addProperties method and add new paths to properties files there, call manually one of the methods AcceleoService#addPropertiesFile() or manually add key/value pairs through AcceleoService#addProperties(). Take note that the key/value pairs manually added will always take precedence over the properties taken from .properties files; and the first added property file will always take precedence over subsequently added files.
The example on all four getProperty variants will take into account the following setup: we provided the environment with a properties file a.properties containing the key/value pair:
a.b.c = This is a parameterized property: {0}Then we provided it with a file b.properties containing the pairs:
a.b.c.d = This is a standard property a.b.c = Parameterized property with a name conflict: {0}
Returns the value of the context index ranks above the current context.
The following example is explained line by line in the "result" column.
Expression Result [for (p: Package | root.packagedElement)][for (c: Class | p.packagedElement)][current(0)/][current(1)/][current(2)/][/for][/for] Iterates over all packages of the Model rootIterates over all classes of the current packageallows access to the current class (equivalent to c)allows access to the current package (equivalent to p)allows access to self as it was before the first for loop
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This will have the same effect as current(Integer) except that is will return the first context (self variable) of the given type, at or above the current one.
The following example is explained line by line in the "result" column.
Expression Result [for (p: Package | root.packagedElement)][for (c: Class | p.packagedElement)][current(Class)/][current(Package)/][current(Model)/][/for][/for] Iterates over all packages of the Model rootIterates over all classes of the current packageallows access to the current class (equivalent to c)allows access to the current package (equivalent to p)allows access to the the root Model
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Returns the value of the property corresponding to the given key. Note that parameterized properties will be returned "as is" by this operation (parameters are not processed).
examples:
Expression Result getProperty('a.b.c') 'This is a parameterized property: {0}' getProperty('a.b.c.d') 'This is a standard property' getProperty('a.b.c.d.e') null
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Returns the value of the property corresponding to the given key, with its parameters substituted with the given values if any.
examples:
Expression Result getProperty('a.b.c', Sequence{'substitution'}) 'This is a parameterized property: substitution' getProperty('a.b.c', Sequence{}) 'This is a parameterized property: {0}' getProperty('a.b.c.d', Sequence{'substitution'}) 'This is a standard property'
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Returns the value of the property corresponding to the given key from a properties file corresponding to the given name. Note that parameterized properties will be returned as is with this.
examples:
Expression Result getProperty('b.properties', 'a.b.c') 'Parameterized property with a name conflict: {0}' getProperty('a.properties', 'a.b.c.d') Ø
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Returns the value of the property corresponding to the given key from a properties file corresponding to the given name, with its parameters substituted with the given values if any.
examples:
Expression Result getProperty('b.properties', 'a.b.c', Sequence{'substitution'}) 'Parameterized property with a name conflict: substitution' getProperty('b.properties', 'a.b.c', Sequence{}) 'Parameterized property with a name conflict: {0}' getProperty('a.properties', 'a.b.c.d', Sequence{'substitution'}) Ø
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Invokes the Java method method of class class with the given arguments. This will return OclInvalid if the method cannot be called in any way (bad arguments, mispelled name, mispelled signature, encapsulation errors, ...). This is only intended to be used to call Java methods for now.
examples:
Expression Result invoke('java.lang.String', 'toUpperCase()', Sequence{root.name}) ROOT
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Returns the String representation of the receiver.
examples depend on the "toString()" implementation of self. Let's assume it has been changed to return the object's name:
Expression Result Class11.toString() 'Class11'
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Returns all elements from the source collection separated by an element composed of the String separator.
examples:
Expression Result package1.eContents().name.sep('2009') Sequence{'Package11', '2009', 'Class1a', '2009', 'Class1b'} package1.eContents().sep('2009') Sequence{Package11, '2009', Class1a, '2009', Class1b}
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Filters out of the collection all elements that are not instances of the given type or any of its subtypes. The returned collection is typed according to type. Makes it easier to write select(e | e.oclIsKindOf(type)).oclAsType(type).
examples:
Expression Result package1.eContents().filter(Class) Sequence{Class1b, Class1a}
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Reverses the order of the collection: the last element becomes the first and vice-versa. Only available on ordered collections (Sequence and OrderedSet).
examples:
Expression Result OrderedSet {1, 2, 3} OrderedSet {3, 2, 1} Sequence {1, 2, 3} Sequence {3, 2, 1}
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Returns the position of the given element in the collection it is applied to. Only available on ordered collections (Sequence and OrderedSet).
examples:
Expression Result OrderedSet {1, 2, 1}->lastIndexOf(1) 3 Sequence {1, 2, 3}->lastIndexOf(4) -1 Sequence {1, null}->lastIndexOf(null) 2 Sequence {1, 2, 3}->lastIndexOf(null) -1
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- invalid
- invalid is the singleton instance of the OCLInvalid type. It is returned whenever an evaluation fails, whatever the cause. Referred to as Ø in this guide.
- Standard / Non-standard
- We refer as standard everything that directly comes or has been inferred from the OMG MOFM2T specification. As such, Standard operations are operations that were defined in the MTL standard library. Likewise, non-standard features are deviations from the specification.
- Ø
- See invalid.