org.geotools.filter
Class LengthFunction
java.lang.Object
org.geotools.filter.DefaultExpression
org.geotools.filter.FunctionExpressionImpl
org.geotools.filter.LengthFunction
- All Implemented Interfaces:
- Expression, ExpressionType, Factory, FunctionExpression
- public class LengthFunction
- extends FunctionExpressionImpl
Takes an AttributeExpression, and computes the length of the data for the attribute.
- Author:
- dzwiers
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 |
int |
getArgCount()
Gets the number of arguments that are set. |
Expression[] |
getArgs()
Gets the arguments to be evaluated by this function. |
java.lang.String |
getName()
Gets the name of this function. |
java.lang.Object |
getValue(Feature feature)
Returns a value for this expression. |
void |
setArgs(Expression[] args)
Sets the arguments to be evaluated by this function. |
java.lang.String |
toString()
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
LengthFunction
public LengthFunction()
getName
public java.lang.String getName()
- Description copied from class:
FunctionExpressionImpl
- Gets the name of this function.
- Specified by:
getName
in interface FunctionExpression
- Specified by:
getName
in class FunctionExpressionImpl
- Returns:
- the name of the function.
setArgs
public void setArgs(Expression[] args)
- Description copied from class:
FunctionExpressionImpl
- Sets the arguments to be evaluated by this function.
- Specified by:
setArgs
in interface FunctionExpression
- Specified by:
setArgs
in class FunctionExpressionImpl
- Parameters:
args
- an array of expressions to be evaluated.
getArgCount
public int getArgCount()
- Description copied from class:
FunctionExpressionImpl
- Gets the number of arguments that are set.
- Specified by:
getArgCount
in interface FunctionExpression
- Specified by:
getArgCount
in class FunctionExpressionImpl
- Returns:
- the number of args.
getArgs
public Expression[] getArgs()
- Description copied from interface:
FunctionExpression
- Gets the arguments to be evaluated by this function.
- Returns:
- an array of the args to be evaluated.
getValue
public java.lang.Object getValue(Feature feature)
- Description copied from interface:
Expression
- Returns a value for this expression. The feature argument is used if a
feature is needed to evaluate the expression, as in the case of an
AttributeExpression.
- Specified by:
getValue
in interface Expression
- Overrides:
getValue
in class DefaultExpression
- Parameters:
feature
- Specified feature to use when returning value.
- Returns:
- The value of this expression based on the feature.
toString
public java.lang.String toString()
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