org.geotools.filter
Interface AttributeExpression

All Superinterfaces:

Expression, ExpressionType

All Known Implementing Classes:

AttributeExpressionImpl, AttributeExpressionImpl2

public interface AttributeExpression

extends Expression

The geotools representation of the PropertyName tag in an xml encoded filter.

It should handle xpath attributePaths of features, and should report the attribute found at the attributePath of a feature.

Version:

$Id: AttributeExpression.java 17702 2006-01-23 00:08:55Z desruisseaux $

Field Summary

Fields inherited from interface org.geotools.filter.ExpressionType

ATTRIBUTE, ATTRIBUTE_DOUBLE, ATTRIBUTE_GEOMETRY, ATTRIBUTE_INTEGER, ATTRIBUTE_STRING, ATTRIBUTE_UNDECLARED, FUNCTION, LITERAL_DOUBLE, LITERAL_GEOMETRY, LITERAL_INTEGER, LITERAL_STRING, MATH_ADD, MATH_DIVIDE, MATH_MULTIPLY, MATH_SUBTRACT

Method Summary

java.lang.String	getAttributePath() Gets the attribute path of this expression.
java.lang.Object	getValue(Feature feature) Gets the attribute value at the path held by this expression from the feature.
void	setAttributePath(java.lang.String attributePath) Sets the path of the attribute of this expression.

Methods inherited from interface org.geotools.filter.Expression

accept, getType

Method Detail

setAttributePath

public void setAttributePath(java.lang.String attributePath)
                      throws IllegalFilterException

Sets the path of the attribute of this expression. For simple, non-nested, features the 'path' is simply the name of an attribute.

Parameters:

attributePath - A string of the path.

Throws:

IllegalFilterException - if the path is not valid.

getValue

public java.lang.Object getValue(Feature feature)

Gets the attribute value at the path held by this expression from the feature.

Specified by:

getValue in interface Expression

Parameters:

feature - the feature to get this attribute from.

Returns:

the value of the attribute found by this expression.

getAttributePath

public java.lang.String getAttributePath()

Gets the attribute path of this expression.

Returns:

the attribute to be queried.