org.codehaus.plexus.interpolation
Class ObjectBasedValueSource

java.lang.Object
  extended by org.codehaus.plexus.interpolation.AbstractValueSource
      extended by org.codehaus.plexus.interpolation.ObjectBasedValueSource
All Implemented Interfaces:
ValueSource

public class ObjectBasedValueSource
extends AbstractValueSource

Wraps an object, providing reflective access to the object graph of which the supplied object is the root. Expressions like 'child.name' will translate into 'rootObject.getChild().getName()' for non-boolean properties, and 'rootObject.getChild().isName()' for boolean properties.

Version:
$Id: ObjectBasedValueSource.java 8355 2009-08-21 16:10:28Z jdcasey $

Constructor Summary
ObjectBasedValueSource(java.lang.Object root)
          Construct a new value source, using the supplied object as the root from which to start, and using expressions split at the dot ('.') to navigate the object graph beneath this root.
 
Method Summary
 java.lang.Object getValue(java.lang.String expression)
          Split the expression into parts, tokenized on the dot ('.') character.
 
Methods inherited from class org.codehaus.plexus.interpolation.AbstractValueSource
addFeedback, addFeedback, clearFeedback, getFeedback
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ObjectBasedValueSource

public ObjectBasedValueSource(java.lang.Object root)
Construct a new value source, using the supplied object as the root from which to start, and using expressions split at the dot ('.') to navigate the object graph beneath this root.

Method Detail

getValue

public java.lang.Object getValue(java.lang.String expression)
Split the expression into parts, tokenized on the dot ('.') character. Then, starting at the root object contained in this value source, apply each part to the object graph below this root, using either 'getXXX()' or 'isXXX()' accessor types to resolve the value for each successive expression part. Finally, return the result of the last expression part's resolution.
NOTE: The object-graph nagivation actually takes place via the ReflectionValueExtractor class.

Returns:
the value related to the expression, or null if not found.


Copyright © 2001-2011 Codehaus. All Rights Reserved.