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Java Source Code / Java Documentation » Scripting » OGNL » ognl 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.beans.FeatureDescriptor
      java.beans.PropertyDescriptor
         ognl.ObjectIndexedPropertyDescriptor

ObjectIndexedPropertyDescriptor
public class ObjectIndexedPropertyDescriptor extends PropertyDescriptor (Code)

PropertyDescriptor subclass that describes an indexed set of read/write methods to get a property. Unlike IndexedPropertyDescriptor this allows the "key" to be an arbitrary object rather than just an int. Consequently it does not have a "readMethod" or "writeMethod" because it only expects a pattern like:

 public void setProperty(KeyType, ValueType);
 public ValueType getProperty(KeyType);
 

and does not require the methods that access it as an array. OGNL can get away with this without losing functionality because if the object does expose the properties they are most probably in a Map and that case is handled by the normal OGNL property accessors.

For example, if an object were to have methods that accessed and "attributes" property it would be natural to index them by String rather than by integer and expose the attributes as a map with a different property name:

 public void setAttribute(String name, Object value);
 public Object getAttribute(String name);
 public Map getAttributes();
 

Note that the index get/set is called get/set Attribute whereas the collection getter is called Attributes. This case is handled unambiguously by the OGNL property accessors because the set/getAttribute methods are detected by this object and the "attributes" case is handled by the MapPropertyAccessor. Therefore OGNL expressions calling this code would be handled in the following way:

OGNL Expression Handling
attribute["name"] Handled by an index getter, like getAttribute(String).
attribute["name"] = value Handled by an index setter, like setAttribute(String, Object).
attributes["name"] Handled by MapPropertyAccessor via a Map.get(). This will not go through the index get accessor.
attributes["name"] = value Handled by MapPropertyAccessor via a Map.put(). This will not go through the index set accessor.

author:
   Luke Blanshard (blanshlu@netscape.net)
author:
   Drew Davidson (drew@ognl.org)



Constructor Summary
public  ObjectIndexedPropertyDescriptor(String propertyName, Class propertyType, Method indexedReadMethod, Method indexedWriteMethod)
    

Method Summary
public  MethodgetIndexedReadMethod()
    
public  MethodgetIndexedWriteMethod()
    
public  ClassgetPropertyType()
    


Constructor Detail
ObjectIndexedPropertyDescriptor
public ObjectIndexedPropertyDescriptor(String propertyName, Class propertyType, Method indexedReadMethod, Method indexedWriteMethod) throws IntrospectionException(Code)




Method Detail
getIndexedReadMethod
public Method getIndexedReadMethod()(Code)



getIndexedWriteMethod
public Method getIndexedWriteMethod()(Code)



getPropertyType
public Class getPropertyType()(Code)



Methods inherited from java.beans.PropertyDescriptor
public PropertyEditor createPropertyEditor(Object bean)(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
public Class getPropertyEditorClass()(Code)(Java Doc)
public synchronized Class getPropertyType()(Code)(Java Doc)
public synchronized Method getReadMethod()(Code)(Java Doc)
public synchronized Method getWriteMethod()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
public boolean isBound()(Code)(Java Doc)
public boolean isConstrained()(Code)(Java Doc)
public void setBound(boolean bound)(Code)(Java Doc)
public void setConstrained(boolean constrained)(Code)(Java Doc)
public void setPropertyEditorClass(Class propertyEditorClass)(Code)(Java Doc)
public synchronized void setReadMethod(Method readMethod) throws IntrospectionException(Code)(Java Doc)
public synchronized void setWriteMethod(Method writeMethod) throws IntrospectionException(Code)(Java Doc)

Methods inherited from java.beans.FeatureDescriptor
public java.util.Enumeration<String> attributeNames()(Code)(Java Doc)
public String getDisplayName()(Code)(Java Doc)
public String getName()(Code)(Java Doc)
public String getShortDescription()(Code)(Java Doc)
public Object getValue(String attributeName)(Code)(Java Doc)
public boolean isExpert()(Code)(Java Doc)
public boolean isHidden()(Code)(Java Doc)
public boolean isPreferred()(Code)(Java Doc)
public void setDisplayName(String displayName)(Code)(Java Doc)
public void setExpert(boolean expert)(Code)(Java Doc)
public void setHidden(boolean hidden)(Code)(Java Doc)
public void setName(String name)(Code)(Java Doc)
public void setPreferred(boolean preferred)(Code)(Java Doc)
public void setShortDescription(String text)(Code)(Java Doc)
public void setValue(String attributeName, Object value)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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