org.zkoss.zel
Class ExpressionFactory

java.lang.Object
  extended by org.zkoss.zel.ExpressionFactory
Direct Known Subclasses:
ExpressionFactoryImpl

public abstract class ExpressionFactory
extends java.lang.Object

Since:
2.1

Constructor Summary
ExpressionFactory()
           
 
Method Summary
abstract  java.lang.Object coerceToType(java.lang.Object obj, java.lang.Class<?> expectedType)
          Coerce the supplied object to the requested type.
abstract  MethodExpression createMethodExpression(ELContext context, java.lang.String expression, java.lang.Class<?> expectedReturnType, java.lang.Class<?>[] expectedParamTypes)
          Create a new method expression instance.
abstract  ValueExpression createValueExpression(ELContext context, java.lang.String expression, java.lang.Class<?> expectedType)
          Create a new value expression.
abstract  ValueExpression createValueExpression(java.lang.Object instance, java.lang.Class<?> expectedType)
           
 java.util.Map<java.lang.String,java.lang.reflect.Method> getInitFunctionMap()
           
 ELResolver getStreamELResolver()
           
static ExpressionFactory newInstance()
          Create a new ExpressionFactory.
static ExpressionFactory newInstance(java.util.Properties properties)
          Create a new ExpressionFactory passing in the provided Properties.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExpressionFactory

public ExpressionFactory()
Method Detail

newInstance

public static ExpressionFactory newInstance()
Create a new ExpressionFactory. The class to use is determined by the following search order:
  1. services API (META-INF/services/javax.el.ExpressionFactory)
  2. $JRE_HOME/lib/el.properties - key javax.el.ExpressionFactory
  3. javax.el.ExpressionFactory
  4. Platform default implementation - org.zkoss.zel.impl.ExpressionFactoryImpl

Returns:
the new ExpressionFactory

newInstance

public static ExpressionFactory newInstance(java.util.Properties properties)
Create a new ExpressionFactory passing in the provided Properties. Search order is the same as newInstance().

Parameters:
properties - the properties to be passed to the new instance (may be null)
Returns:
the new ExpressionFactory

createValueExpression

public abstract ValueExpression createValueExpression(ELContext context,
                                                      java.lang.String expression,
                                                      java.lang.Class<?> expectedType)
Create a new value expression.

Parameters:
context - The EL context for this evaluation
expression - The String representation of the value expression
expectedType - The expected type of the result of evaluating the expression
Returns:
A new value expression formed from the input parameters
Throws:
java.lang.NullPointerException - If the expected type is null
ELException - If there are syntax errors in the provided expression

createValueExpression

public abstract ValueExpression createValueExpression(java.lang.Object instance,
                                                      java.lang.Class<?> expectedType)

createMethodExpression

public abstract MethodExpression createMethodExpression(ELContext context,
                                                        java.lang.String expression,
                                                        java.lang.Class<?> expectedReturnType,
                                                        java.lang.Class<?>[] expectedParamTypes)
Create a new method expression instance.

Parameters:
context - The EL context for this evaluation
expression - The String representation of the method expression
expectedReturnType - The expected type of the result of invoking the method
expectedParamTypes - The expected types of the input parameters
Returns:
A new method expression formed from the input parameters.
Throws:
java.lang.NullPointerException - If the expected parameters types are null
ELException - If there are syntax errors in the provided expression

coerceToType

public abstract java.lang.Object coerceToType(java.lang.Object obj,
                                              java.lang.Class<?> expectedType)
Coerce the supplied object to the requested type.

Parameters:
obj - The object to be coerced
expectedType - The type to which the object should be coerced
Returns:
An instance of the requested type.
Throws:
ELException - If the conversion fails

getStreamELResolver

public ELResolver getStreamELResolver()
Returns:
This default implementation returns null
Since:
EL 3.0

getInitFunctionMap

public java.util.Map<java.lang.String,java.lang.reflect.Method> getInitFunctionMap()
Returns:
This default implementation returns null
Since:
EL 3.0


Copyright © 2005-2011 Potix Corporation. All Rights Reserved. SourceForge.net Logo