Package org.zkoss.zel
Class ExpressionFactory
- java.lang.Object
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- org.zkoss.zel.ExpressionFactory
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- Direct Known Subclasses:
ExpressionFactoryImpl
public abstract class ExpressionFactory extends java.lang.Object
- Since:
- 2.1
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Constructor Summary
Constructors Constructor Description ExpressionFactory()
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description 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(java.lang.Object instance, java.lang.Class<?> expectedType)
abstract ValueExpression
createValueExpression(ELContext context, java.lang.String expression, java.lang.Class<?> expectedType)
Create a new value expression.java.util.Map<java.lang.String,java.lang.reflect.Method>
getInitFunctionMap()
ELResolver
getStreamELResolver()
static ExpressionFactory
newInstance()
Create a newExpressionFactory
.static ExpressionFactory
newInstance(java.util.Properties properties)
Create a newExpressionFactory
passing in the providedProperties
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Method Detail
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newInstance
public static ExpressionFactory newInstance()
Create a newExpressionFactory
. The class to use is org.zkoss.zel.impl.ExpressionFactoryImpl.- Returns:
- the new ExpressionFactory
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newInstance
public static ExpressionFactory newInstance(java.util.Properties properties)
Create a newExpressionFactory
passing in the providedProperties
. Search order is the same asnewInstance()
.- Parameters:
properties
- the properties to be passed to the new instance (may be null)- Returns:
- the new ExpressionFactory
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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 evaluationexpression
- The String representation of the value expressionexpectedType
- 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 isnull
ELException
- If there are syntax errors in the provided expression
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createValueExpression
public abstract ValueExpression createValueExpression(java.lang.Object instance, java.lang.Class<?> expectedType)
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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 evaluationexpression
- The String representation of the method expressionexpectedReturnType
- The expected type of the result of invoking the methodexpectedParamTypes
- 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 arenull
ELException
- If there are syntax errors in the provided expression
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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 coercedexpectedType
- The type to which the object should be coerced- Returns:
- An instance of the requested type.
- Throws:
ELException
- If the conversion fails
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getStreamELResolver
public ELResolver getStreamELResolver()
- Returns:
- This default implementation returns null
- Since:
- EL 3.0
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getInitFunctionMap
public java.util.Map<java.lang.String,java.lang.reflect.Method> getInitFunctionMap()
- Returns:
- This default implementation returns null
- Since:
- EL 3.0
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