org.codehaus.groovy.grails.commons
Class GrailsClassUtils

java.lang.Object
  org.codehaus.groovy.grails.commons.GrailsClassUtils

public class GrailsClassUtils
extends Object

Since:

08-Jul-2005 Class containing utility methods for dealing with Grails class artifacts

Author:

Graeme Rocher

Field Summary

static Map

PRIMITIVE_TYPE_COMPATIBLE_CLASSES

Constructor Summary

GrailsClassUtils()

Method Summary

static Object[]	collectionToObjectArray(Collection c) Convenience method for converting a collection to an Object[]
static Collection	createConcreteCollection(Class interfaceType) Creates a concrete collection for the suppied interface
static boolean	getBooleanFromMap(String key, Map map) Retrieves a boolean value from a Map for the given key
static String	getClassName(String logicalName, String trailingName) Returns the class name for the given logical name and trailing name.
static String	getClassNameRepresentation(String name) Returns the class name representation of the given name
static groovy.lang.MetaClass	getExpandoMetaClass(Class clazz)
static Object	getFieldValue(Object obj, String name) Get the value of a declared field on an object
static String	getGetterName(String propertyName) Calculate the name for a getter method to retrieve the specified property
static String	getLogicalName(Class clazz, String trailingName) Retrieves the logical class name of a Grails artifact given the Grails class and a specified trailing name
static String	getLogicalName(String name, String trailingName) Retrieves the logical name of the classs without the trailing name
static String	getLogicalPropertyName(String className, String trailingName)
static String	getNameFromScript(String scriptName) Calculates the class name from a script name in the form my-funk-grails-script
static String	getNaturalName(String name) Converts a property name into its natural language equivalent eg ('firstName' becomes 'First Name')
static PropertyDescriptor[]	getPropertiesOfType(Class clazz, Class propertyType) Retrieves all the properties of the given class for the given type
static PropertyDescriptor	getProperty(Class clazz, String propertyName, Class propertyType) Retrieves a property of the given class of the specified name and type
static PropertyDescriptor	getPropertyDescriptorForValue(Object instance, Object propertyValue) Retrieves a PropertyDescriptor for the specified instance and property value
static String	getPropertyForGetter(String getterName) Returns a property name equivalent for the given getter name or null if it is not a getter
static String	getPropertyForSetter(String setterName) Returns a property name equivalent for the given setter name or null if it is not a getter
static String	getPropertyName(Class clazz) Shorter version of getPropertyNameRepresentation
static String	getPropertyName(String name) Shorter version of getPropertyNameRepresentation
static String	getPropertyNameForLowerCaseHyphenSeparatedName(String name) Converts foo-bar into fooBar
static String	getPropertyNameRepresentation(Class targetClass) Returns the property name equivalent for the specified class
static String	getPropertyNameRepresentation(String name) Returns the property name representation of the given name
static Object	getPropertyOrStaticPropertyOrFieldValue(Object obj, String name) Looks for a property of the reference instance with a given name.
static Class	getPropertyType(Class clazz, String propertyName) Returns the type of the given property contained within the specified class
static Object	getPropertyValueOfNewInstance(Class clazz, String propertyName) Returns the value of the specified property and type from an instance of the specified Grails class
static Object	getPropertyValueOfNewInstance(Class clazz, String propertyName, Class propertyType) Returns the value of the specified property and type from an instance of the specified Grails class
static String	getScriptName(Class clazz) Retrieves the script name representation of the supplied class.
static String	getScriptName(String name)
static String	getSetterName(String propertyName) Retrieves the name of a setter for the specified property name
static String	getShortName(Class targetClass) Returns the class name without the package prefix
static String	getShortName(String className) Returns the class name without the package prefix
static Object	getStaticPropertyValue(Class clazz, String name) Get a static property value, which has a public static getter or is just a public static field.
static boolean	isAssignableOrConvertibleFrom(Class clazz, Class type) Returns true if the specified clazz parameter is either the same as, or is a superclass or superinterface of, the specified type parameter.
static boolean	isGetter(String name, Class[] args) Returns true if the name of the method specified and the number of arguments make it a javabean property
static boolean	isGroovyAssignableFrom(Class leftType, Class rightType) Tests whether or not the left hand type is compatible with the right hand type in Groovy terms, i.e. can the left type be assigned a value of the right hand type in Groovy.
static boolean	isMatchBetweenPrimativeAndWrapperTypes(Class leftType, Class rightType) Detect if left and right types are matching types.
static boolean	isPropertyInherited(Class clz, String propertyName) Checks whether the specified property is inherited from a super class
static boolean	isPropertyOfType(Class clazz, String propertyName, Class type) Returns true if the specified property in the specified class is of the specified type
static boolean	isPublicField(Object obj, String name) Work out if the specified object has a public field with the name supplied.
static boolean	isPublicStatic(Field f) Determine whether the field is declared public static
static boolean	isPublicStatic(Method m) Determine whether the method is declared public static
static boolean	isSetter(String name, Class[] args)
static boolean	isStaticProperty(Class clazz, String propertyName) Work out if the specified property is readable and static.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PRIMITIVE_TYPE_COMPATIBLE_CLASSES

public static final Map PRIMITIVE_TYPE_COMPATIBLE_CLASSES

Constructor Detail

GrailsClassUtils

public GrailsClassUtils()

Method Detail

isPropertyOfType

public static boolean isPropertyOfType(Class clazz,
                                       String propertyName,
                                       Class type)

Returns true if the specified property in the specified class is of the specified type

Parameters:

clazz - The class which contains the property

propertyName - The property name

type - The type to check

Returns:

A boolean value

getPropertyValueOfNewInstance

public static Object getPropertyValueOfNewInstance(Class clazz,
                                                   String propertyName,
                                                   Class propertyType)

Returns the value of the specified property and type from an instance of the specified Grails class

Parameters:

clazz - The name of the class which contains the property

propertyName - The property name

propertyType - The property type

Returns:

The value of the property or null if none exists

getPropertyValueOfNewInstance

public static Object getPropertyValueOfNewInstance(Class clazz,
                                                   String propertyName)

Returns the value of the specified property and type from an instance of the specified Grails class

Parameters:

clazz - The name of the class which contains the property

propertyName - The property name

Returns:

The value of the property or null if none exists

getPropertyDescriptorForValue

public static PropertyDescriptor getPropertyDescriptorForValue(Object instance,
                                                               Object propertyValue)

Retrieves a PropertyDescriptor for the specified instance and property value

Parameters:

instance - The instance

propertyValue - The value of the property

Returns:

The PropertyDescriptor

getPropertyType

public static Class getPropertyType(Class clazz,
                                    String propertyName)

Returns the type of the given property contained within the specified class

Parameters:

clazz - The class which contains the property

propertyName - The name of the property

Returns:

The property type or null if none exists

getPropertiesOfType

public static PropertyDescriptor[] getPropertiesOfType(Class clazz,
                                                       Class propertyType)

Retrieves all the properties of the given class for the given type

Parameters:

clazz - The class to retrieve the properties from

propertyType - The type of the properties you wish to retrieve

Returns:

An array of PropertyDescriptor instances

getProperty

public static PropertyDescriptor getProperty(Class clazz,
                                             String propertyName,
                                             Class propertyType)

Retrieves a property of the given class of the specified name and type

Parameters:

clazz - The class to retrieve the property from

propertyName - The name of the property

propertyType - The type of the property

Returns:

A PropertyDescriptor instance or null if none exists

getShortName

public static String getShortName(Class targetClass)

Returns the class name without the package prefix

Parameters:

targetClass - The class to get a short name for

Returns:

The short name of the class

getShortName

public static String getShortName(String className)

Returns the class name without the package prefix

Parameters:

className - The class name to get a short name for

Returns:

The short name of the class

getPropertyNameRepresentation

public static String getPropertyNameRepresentation(Class targetClass)

Returns the property name equivalent for the specified class

Parameters:

targetClass - The class to get the property name for

Returns:

A property name reperesentation of the class name (eg. MyClass becomes myClass)

getPropertyNameRepresentation

public static String getPropertyNameRepresentation(String name)

Returns the property name representation of the given name

Parameters:

name - The name to convert

Returns:

The property name representation

getClassNameRepresentation

public static String getClassNameRepresentation(String name)

Returns the class name representation of the given name

Parameters:

name - The name to convert

Returns:

The property name representation

getPropertyName

public static String getPropertyName(String name)

Shorter version of getPropertyNameRepresentation

Parameters:

name - The name to convert

Returns:

The property name version

getPropertyName

public static String getPropertyName(Class clazz)

Shorter version of getPropertyNameRepresentation

Parameters:

clazz - The clazz to convert

Returns:

The property name version

getScriptName

public static String getScriptName(Class clazz)

Retrieves the script name representation of the supplied class. For example MyFunkyGrailsScript would be my-funky-grails-script

Parameters:

clazz - The class to convert

Returns:

The script name representation

getScriptName

public static String getScriptName(String name)

getNameFromScript

public static String getNameFromScript(String scriptName)

Calculates the class name from a script name in the form my-funk-grails-script

Parameters:

scriptName - The script name

Returns:

A class name

getPropertyNameForLowerCaseHyphenSeparatedName

public static String getPropertyNameForLowerCaseHyphenSeparatedName(String name)

Converts foo-bar into fooBar

Parameters:

name - The lower case hyphen separated name

Returns:

The property name equivalent

getNaturalName

public static String getNaturalName(String name)

Converts a property name into its natural language equivalent eg ('firstName' becomes 'First Name')

Parameters:

name - The property name to convert

Returns:

The converted property name

collectionToObjectArray

public static Object[] collectionToObjectArray(Collection c)

Convenience method for converting a collection to an Object[]

Parameters:

c - The collection

Returns:

An object array

isMatchBetweenPrimativeAndWrapperTypes

public static boolean isMatchBetweenPrimativeAndWrapperTypes(Class leftType,
                                                             Class rightType)

Detect if left and right types are matching types. In particular, test if one is a primitive type and the other is the corresponding Java wrapper type. Primitive and wrapper classes may be passed to either arguments.

Parameters:

leftType -

rightType -

Returns:

true if one of the classes is a native type and the other the object representation of the same native type

isGroovyAssignableFrom

public static boolean isGroovyAssignableFrom(Class leftType,
                                             Class rightType)

Tests whether or not the left hand type is compatible with the right hand type in Groovy terms, i.e. can the left type be assigned a value of the right hand type in Groovy.

This handles Java primitive type equivalence and uses isAssignableFrom for all other types, with a bit of magic for native types and polymorphism i.e. Number assigned an int. If either parameter is null an exception is thrown

Parameters:

leftType - The type of the left hand part of a notional assignment

rightType - The type of the right hand part of a notional assignment

Returns:

True if values of the right hand type can be assigned in Groovy to variables of the left hand type.

isStaticProperty

public static boolean isStaticProperty(Class clazz,
                                       String propertyName)

Work out if the specified property is readable and static. Java introspection does not recognize this concept of static properties but Groovy does. We also consider public static fields as static properties with no getters/setters

Parameters:

clazz - The class to check for static property

propertyName - The property name

Returns:

true if the property with name propertyName has a static getter method

isPublicStatic

public static boolean isPublicStatic(Method m)

Determine whether the method is declared public static

Parameters:

m -

Returns:

True if the method is declared public static

isPublicStatic

public static boolean isPublicStatic(Field f)

Determine whether the field is declared public static

Parameters:

f -

Returns:

True if the field is declared public static

getGetterName

public static String getGetterName(String propertyName)

Calculate the name for a getter method to retrieve the specified property

Parameters:

propertyName -

Returns:

The name for the getter method for this property, if it were to exist, i.e. getConstraints

getStaticPropertyValue

public static Object getStaticPropertyValue(Class clazz,
                                            String name)

Get a static property value, which has a public static getter or is just a public static field.

Parameters:

clazz - The class to check for static property

name - The property name

Returns:

The value if there is one, or null if unset OR there is no such property

getPropertyOrStaticPropertyOrFieldValue

public static Object getPropertyOrStaticPropertyOrFieldValue(Object obj,
                                                             String name)
                                                      throws BeansException

Looks for a property of the reference instance with a given name.

If found its value is returned. We follow the Java bean conventions with augmentation for groovy support and static fields/properties. We will therefore match, in this order:

1. Standard public bean property (with getter or just public field, using normal introspection)
2. Public static property with getter method
3. Public static field

Returns:

property value or null if no property found

Throws:

BeansException

getFieldValue

public static Object getFieldValue(Object obj,
                                   String name)

Get the value of a declared field on an object

Parameters:

obj -

name -

Returns:

The object value or null if there is no such field or access problems

isPublicField

public static boolean isPublicField(Object obj,
                                    String name)

Work out if the specified object has a public field with the name supplied.

Parameters:

obj -

name -

Returns:

True if a public field with the name exists

isPropertyInherited

public static boolean isPropertyInherited(Class clz,
                                          String propertyName)

Checks whether the specified property is inherited from a super class

Parameters:

clz - The class to check

propertyName - The property name

Returns:

True if the property is inherited

createConcreteCollection

public static Collection createConcreteCollection(Class interfaceType)

Creates a concrete collection for the suppied interface

Parameters:

interfaceType - The interface

Returns:

ArrayList for List, TreeSet for SortedSet, HashSet for Set etc.

getLogicalName

public static String getLogicalName(Class clazz,
                                    String trailingName)

Retrieves the logical class name of a Grails artifact given the Grails class and a specified trailing name

Parameters:

clazz - The class

trailingName - The trailing name such as "Controller" or "TagLib"

Returns:

The logical class name

getLogicalName

public static String getLogicalName(String name,
                                    String trailingName)

Retrieves the logical name of the classs without the trailing name

Parameters:

name - The name of the class

trailingName - The trailing name

Returns:

The logical name

getLogicalPropertyName

public static String getLogicalPropertyName(String className,
                                            String trailingName)

getSetterName

public static String getSetterName(String propertyName)

Retrieves the name of a setter for the specified property name

Parameters:

propertyName - The property name

Returns:

The setter equivalent

isGetter

public static boolean isGetter(String name,
                               Class[] args)

Returns true if the name of the method specified and the number of arguments make it a javabean property

Parameters:

name - True if its a Javabean property

args - The arguments

Returns:

True if it is a javabean property method

getPropertyForGetter

public static String getPropertyForGetter(String getterName)

Returns a property name equivalent for the given getter name or null if it is not a getter

Parameters:

getterName - The getter name

Returns:

The property name equivalent

getPropertyForSetter

public static String getPropertyForSetter(String setterName)

Returns a property name equivalent for the given setter name or null if it is not a getter

Parameters:

setterName - The setter name

Returns:

The property name equivalent

isSetter

public static boolean isSetter(String name,
                               Class[] args)

getExpandoMetaClass

public static groovy.lang.MetaClass getExpandoMetaClass(Class clazz)

isAssignableOrConvertibleFrom

public static boolean isAssignableOrConvertibleFrom(Class clazz,
                                                    Class type)

Returns true if the specified clazz parameter is either the same as, or is a superclass or superinterface of, the specified type parameter. Converts primitive types to compatible class automatically.

Parameters:

clazz -

type -

Returns:

True if the class is a taglib

See Also:

Class.isAssignableFrom(Class)

getBooleanFromMap

public static boolean getBooleanFromMap(String key,
                                        Map map)

Retrieves a boolean value from a Map for the given key

Parameters:

key - The key that references the boolean value

map - The map to look in

Returns:

A boolean value which will be false if the map is null, the map doesn't contain the key or the value is false

getClassName

public static String getClassName(String logicalName,
                                  String trailingName)

Returns the class name for the given logical name and trailing name. For example "person" and "Controller" would evaluate to "PersonController"

Parameters:

logicalName - The logical name

trailingName - The trailing name

Returns:

The class name