## org.springframework.metadata.commons
Class CommonsAttributes

    java.lang.Object
      org.springframework.metadata.commons.CommonsAttributes

All Implemented Interfaces:
  Attributes

    public class CommonsAttributes

extends Object
implements Attributes

Implementation of the Spring Attributes facade for Commons Attributes.

Please see the Commons Attributes documentation for information on how to use the attribute compiler.

As of December 2003, follow the Javadocs to the AttributeCompiler class to see how the Ant task works. Note that you need to put the following jars in your $ANT_HOME/lib directory for the Common Attributes compiler to work:

- Commons Attributes compiler jar
- the xjavadoc Jar (from XDoclet)
- commons-collection.jar (from Jakarta Commons)

You need to perform the attribute compilation step before compiling your source.

See build.xml in the tests for package org.springframework.aop.autoproxy.metadata for an example of the required Ant scripting. The header of this build script includes some quick, and hopefully useful, hints on using Commons Attributes. The source files in the same package (TxClass and TxClassWithClassAttribute) illustrate attribute usage in source files.

The Spring Framework project does not provide support usage of specific attributes implementations. Please refer to the appropriate site and mailing list of the attributes implementation.

Author:
  Rod Johnson

Constructor Summary
`CommonsAttributes()`

Method Summary
`Collection` `getAttributes(Class targetClass)` Return the class attributes of the target class.
`Collection` `getAttributes(Class targetClass, Class filter)` Return the class attributes of the target class of a given type.
`Collection` `getAttributes(Field targetField)` Return the field attributes of the target field.
`Collection` `getAttributes(Field targetField, Class filter)` Return the field attributes of the target method of a given type.
`Collection` `getAttributes(Method targetMethod)` Return the method attributes of the target method.
`Collection` `getAttributes(Method targetMethod, Class filter)` Return the method attributes of the target method of a given type.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CommonsAttributes

    public CommonsAttributes()

Method Detail

### getAttributes

    public Collection getAttributes(Class targetClass)

  Description copied from interface: `Attributes`
  Return the class attributes of the target class.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetClass` - the class that contains attribute information
  Returns:
    a collection of attributes, possibly an empty collection, never `null`

### getAttributes

    public Collection getAttributes(Class targetClass,
                                    Class filter)

  Description copied from interface: `Attributes`
  Return the class attributes of the target class of a given type.

  The class attributes are filtered by providing a `Class` reference to indicate the type to filter on. This is useful if you know the type of the attribute you are looking for and don't want to sort through the unfiltered Collection yourself.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetClass` - the class that contains attribute information
    `filter` - specify that only this type of class should be returned
  Returns:
    return only the Collection of attributes that are of the filter type

### getAttributes

    public Collection getAttributes(Method targetMethod)

  Description copied from interface: `Attributes`
  Return the method attributes of the target method.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetMethod` - the method that contains attribute information
  Returns:
    a Collection of attributes, possibly an empty Collection, never `null`

### getAttributes

    public Collection getAttributes(Method targetMethod,
                                    Class filter)

  Description copied from interface: `Attributes`
  Return the method attributes of the target method of a given type.

  The method attributes are filtered by providing a `Class` reference to indicate the type to filter on. This is useful if you know the type of the attribute you are looking for and don't want to sort through the unfiltered Collection yourself.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetMethod` - the method that contains attribute information
    `filter` - specify that only this type of class should be returned
  Returns:
    a Collection of attributes, possibly an empty Collection, never `null`

### getAttributes

    public Collection getAttributes(Field targetField)

  Description copied from interface: `Attributes`
  Return the field attributes of the target field.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetField` - the field that contains attribute information
  Returns:
    a Collection of attribute, possibly an empty Collection, never `null`

### getAttributes

    public Collection getAttributes(Field targetField,
                                    Class filter)

  Description copied from interface: `Attributes`
  Return the field attributes of the target method of a given type.

  The field attributes are filtered by providing a `Class` reference to indicate the type to filter on. This is useful if you know the type of the attribute you are looking for and don't want to sort through the unfiltered Collection yourself.

  Specified by:
    `getAttributes` in interface `Attributes`
  Parameters:
    `targetField` - the field that contains attribute information
    `filter` - specify that only this type of class should be returned
  Returns:
    a Collection of attributes, possibly an empty Collection, never `null`

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