org.vedantatree.expressionoasis.extensions

Class DefaultFunctionProvider

java.lang.Object

org.vedantatree.expressionoasis.extensions.DefaultFunctionProvider

All Implemented Interfaces:

FunctionProvider

Direct Known Subclasses:

CustomFunctionProvider

public class DefaultFunctionProvider
extends Object
implements FunctionProvider

This is the default function provider.

Version:

1.0 Modified so that the constructor registers the methods of the functionProviderClass as functions with the grammar and expression factory. Modified so that the functionProviderObject is created only on the first invocation of initialize, rather than every time a new ExpressionContext is created. Modified so that method keys use non-primitive type names., 1.1

Author:

Parmod Kamboj, Mohit Gupta, Kris Marwood

Constructor Summary

Constructors

Constructor and Description
DefaultFunctionProvider(Class functionProviderClass) Constructor.

Method Summary

Modifier and Type	Method and Description
Type	getFunctionType(String functionName, Type[] parameterTypes) Gets the return type of the function.
ValueObject	getFunctionValue(String functionName, ValueObject[] parameters) Gets the return value of function.
void	initialize(ExpressionContext expressionContext) Initializes the method map.
boolean	supportsFunction(String functionName, Type[] parameterTypes) Checks whether the this function provider supports any function or not.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultFunctionProvider

public DefaultFunctionProvider(Class functionProviderClass)
                        throws ExpressionEngineException

Constructor.

Parameters:

functionProviderClass -

Throws:

ExpressionEngineException

Method Detail

getFunctionType

public Type getFunctionType(String functionName,
                            Type[] parameterTypes)
                     throws ExpressionEngineException

Description copied from interface: FunctionProvider

Gets the return type of the function.

Specified by:

getFunctionType in interface FunctionProvider

Parameters:

functionName - the name of the function.

parameterTypes - the types of the parameters

Returns:

the return type of the function

Throws:

ExpressionEngineException - if anything goes wrong

See Also:

org.vedantatree.expressionoasis.extensions.FunctionProvider#getFunctionType(java.lang.String, org.vedantatree.types.Type[])

getFunctionValue

public ValueObject getFunctionValue(String functionName,
                                    ValueObject[] parameters)
                             throws ExpressionEngineException

Description copied from interface: FunctionProvider

Gets the return value of function.

Specified by:

getFunctionValue in interface FunctionProvider

Parameters:

functionName - the name of the function

parameters - the parameters values of the function

Returns:

the return value of the function

Throws:

ExpressionEngineException - if anything goes wrong

See Also:

org.vedantatree.expressionoasis.extensions.FunctionProvider#getFunctionValue(java.lang.String, org.vedantatree.types.ValueObject[])

supportsFunction

public boolean supportsFunction(String functionName,
                                Type[] parameterTypes)
                         throws ExpressionEngineException

Description copied from interface: FunctionProvider

Checks whether the this function provider supports any function or not.

Specified by:

supportsFunction in interface FunctionProvider

Parameters:

functionName - the name of the function

parameterTypes - the type of parameters for the function

Returns:

true if function provider supports the function false otherwise

Throws:

ExpressionEngineException - if anything goes wrong

See Also:

org.vedantatree.expressionoasis.extensions.FunctionProvider#supportsFunction(java.lang.String, org.vedantatree.types.Type[])

initialize

public void initialize(ExpressionContext expressionContext)
                throws ExpressionEngineException

Initializes the method map.

Specified by:

initialize in interface FunctionProvider

Parameters:

expressionContext - Context of current expression evaluation process

Throws:

ExpressionEngineException