Package org.geotools.data.wfs.internal.v2_0.storedquery

Class ParameterCQLExpressionPropertyName

Object

ParameterCQLExpressionPropertyName

All Implemented Interfaces:

Expression, PropertyName

public abstract class ParameterCQLExpressionPropertyName
extends Object
implements PropertyName

Field Summary

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor	Description
ParameterCQLExpressionPropertyName(String name)

Method Summary

Modifier and Type	Method	Description
Object	accept(ExpressionVisitor visitor, Object extraData)	Accepts a visitor.
Object	evaluate(Object object)	Evaluates the given expression based on the content of the given object.
<T> T	evaluate(Object object, Class<T> context)	Evaluates the given expressoin based on the content of the given object and the context type.
protected abstract Object	get(ParameterMappingContext context)
NamespaceSupport	getNamespaceContext()	Returns namespace context information, or null if unavailable/inapplicable
String	getPropertyName()	Returns the name of the property whose value will be returned by the evaluate method.

Methods inherited from class Object

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

Constructor Detail

ParameterCQLExpressionPropertyName

public ParameterCQLExpressionPropertyName(String name)

Method Detail

evaluate

public Object evaluate(Object object)

Description copied from interface: Expression

Evaluates the given expression based on the content of the given object.

Specified by:

evaluate in interface Expression

Returns:

computed value

get

protected abstract Object get(ParameterMappingContext context)

evaluate

public <T> T evaluate(Object object,
                      Class<T> context)

Description copied from interface: Expression

Evaluates the given expressoin based on the content of the given object and the context type.

The context parameter is used to control the type of the result of the expression. A particular expression may not be able to evaluate to an instance of context. Therefore to be safe calling code should do a null check on the return value of this method, and call Expression.evaluate(Object) if neccessary. Example:

  Object input = ...;
  String result = expression.evaluate( input, String.class );
  if ( result == null ) {
     result = expression.evalute( input ).toString();
  }
  ...
 

Implementations that can not return a result as an instance of context should return null.

Specified by:

evaluate in interface Expression

Type Parameters:

T - The type of the returned object.

Parameters:

object - The object to evaluate the expression against.

context - The type of the resulting value of the expression.

Returns:

Evaluates the given expression based on the content of the given object an an instance of context.

accept

public Object accept(ExpressionVisitor visitor,
                     Object extraData)

Description copied from interface: Expression

Accepts a visitor. Subclasses must implement with a method whose content is the following:

return visitor.visit(this, extraData);

Specified by:

accept in interface Expression

getPropertyName

public String getPropertyName()

Description copied from interface: PropertyName

Returns the name of the property whose value will be returned by the evaluate method.

Specified by:

getPropertyName in interface PropertyName

getNamespaceContext

public NamespaceSupport getNamespaceContext()

Description copied from interface: PropertyName

Returns namespace context information, or null if unavailable/inapplicable

Specified by:

getNamespaceContext in interface PropertyName

Returns:

namespace context information, or null if unavailable/inapplicable