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java.lang.Objectorg.geotools.filter.FunctionFinder
public class FunctionFinder
Isolate function lookup code from Factory implementation(s).
This is done to look for two things:
Constructor Summary | |
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FunctionFinder(Hints hints)
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Method Summary | |
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org.opengis.filter.expression.Function |
findFunction(java.lang.String name)
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org.opengis.filter.expression.Function |
findFunction(java.lang.String name,
java.util.List parameters)
Look up a function for the provided name. |
org.opengis.filter.expression.Function |
findFunction(java.lang.String name,
java.util.List parameters,
org.opengis.filter.expression.Literal fallback)
Look up a function for the provided name, may return a FallbackFunction if an implementation could not be found. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FunctionFinder(Hints hints)
Method Detail |
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public org.opengis.filter.expression.Function findFunction(java.lang.String name)
public org.opengis.filter.expression.Function findFunction(java.lang.String name, java.util.List parameters)
name
- Function name; this will need to be an exact matchparameters
- Set of parameters required
a
- RuntimeException if an implementation for name could not be foundpublic org.opengis.filter.expression.Function findFunction(java.lang.String name, java.util.List parameters, org.opengis.filter.expression.Literal fallback)
You can create a function to represent an SQL function or a function hosted on an external service; the fallback value will be used if you evulate by a Java implementation on the classpath.
name
- Function name; this will need to be an exact matchparameters
- Set of Expressions to use as function parametersfallbackValue
- Literal to use if an implementation could not be found
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