org.zkoss.xel.util

Class DualFunctionMapper

java.lang.Object

org.zkoss.xel.util.DualFunctionMapper

All Implemented Interfaces:

Serializable, FunctionMapper, FunctionMapperExt

public class DualFunctionMapper
extends Object
implements FunctionMapper, FunctionMapperExt, Serializable

Combine two function mappers into one function mapper.

Since:

3.0.0

Author:

tomyeh

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DualFunctionMapper(FunctionMapper first, FunctionMapper second) Constructor.

Method Summary

Modifier and Type	Method and Description
static FunctionMapper	combine(FunctionMapper first, FunctionMapper second) Returns a function mapper by combining two function mappers.
Collection<String>	getClassNames() Returns a readonly collection of the logic names of the class (never null).
Class<?>	resolveClass(String name) Resolves a class with the specified logic name, or null if not found.
Function	resolveFunction(String prefix, String name) Resolves a function Function with the specified name and prefix.

Methods inherited from class java.lang.Object

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

Constructor Detail

DualFunctionMapper

public DualFunctionMapper(FunctionMapper first,
                          FunctionMapper second)

Constructor. It is better to use combine(org.zkoss.xel.FunctionMapper, org.zkoss.xel.FunctionMapper) instead of this method since it checks whether any of them is null or equals.

Method Detail

combine

public static final FunctionMapper combine(FunctionMapper first,
                                           FunctionMapper second)

Returns a function mapper by combining two function mappers. It checks whether any of them is null, or equals. And, returns the non-null one if another is null. If both null, it returns null.

resolveFunction

public Function resolveFunction(String prefix,
                                String name)

Description copied from interface: FunctionMapper

Resolves a function Function with the specified name and prefix.

Note: not all EL evaluator support FunctionMapper.resolveFunction(java.lang.String, java.lang.String). Currently only JSP 2.0/2.1 EL-based expression factories support this method. You can check ExpressionFactory.isSupported(int) for this support.

Specified by:

resolveFunction in interface FunctionMapper

Parameters:

prefix - the prefix of the function, or "" if no prefix

name - the name of the function to resolve

getClassNames

public Collection<String> getClassNames()

Description copied from interface: FunctionMapperExt

Returns a readonly collection of the logic names of the class (never null). Note: it is the name to resolve class, not the real class name. In other words, it is the logical name maintained by this function mapper.

Specified by:

getClassNames in interface FunctionMapperExt

resolveClass

public Class<?> resolveClass(String name)

Description copied from interface: FunctionMapperExt

Resolves a class with the specified logic name, or null if not found.

Note: not all EL evaluator support FunctionMapperExt.resolveClass(java.lang.String). JSP 2.0/2.1 EL-based expression factories don't support this method. You can check ExpressionFactory.isSupported(int) for this support.

Specified by:

resolveClass in interface FunctionMapperExt

Returns:

the class of the specified logic name.