Package org.zkoss.zel
Class ValueExpression
- java.lang.Object
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- org.zkoss.zel.Expression
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- org.zkoss.zel.ValueExpression
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- All Implemented Interfaces:
java.io.Serializable
- Direct Known Subclasses:
ValueExpressionImpl
,ValueExpressionLiteral
public abstract class ValueExpression extends Expression
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description ValueExpression()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract java.lang.Class<?>
getExpectedType()
abstract java.lang.Class<?>
getType(ELContext context)
abstract java.lang.Object
getValue(ELContext context)
ValueReference
getValueReference(ELContext context)
abstract boolean
isReadOnly(ELContext context)
abstract void
setValue(ELContext context, java.lang.Object value)
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Methods inherited from class org.zkoss.zel.Expression
equals, getExpressionString, hashCode, isLiteralText
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Method Detail
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getValue
public abstract java.lang.Object getValue(ELContext context)
- Parameters:
context
- The EL context for this evaluation- Returns:
- The result of evaluating this value expression
- Throws:
java.lang.NullPointerException
- If the supplied context isnull
PropertyNotFoundException
- If a property/variable resolution failed because no match was found or a match was found but was not readableELException
- Wraps any exception throw whilst resolving a property or variable
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setValue
public abstract void setValue(ELContext context, java.lang.Object value)
- Parameters:
context
- The EL context for this evaluationvalue
- The value to set the property to which this value expression refers- Throws:
java.lang.NullPointerException
- If the supplied context isnull
PropertyNotFoundException
- If a property/variable resolution failed because no match was foundPropertyNotWritableException
- If a property/variable resolution failed because a match was found but was not writableELException
- Wraps any exception throw whilst resolving a property or variable
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isReadOnly
public abstract boolean isReadOnly(ELContext context)
- Parameters:
context
- The EL context for this evaluation- Returns:
true
if this expression is read only otherwisefalse
- Throws:
java.lang.NullPointerException
- If the supplied context isnull
PropertyNotFoundException
- If a property/variable resolution failed because no match was found or a match was found but was not readableELException
- Wraps any exception throw whilst resolving a property or variable
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getType
public abstract java.lang.Class<?> getType(ELContext context)
- Parameters:
context
- The EL context for this evaluation- Returns:
- The type of the result of this value expression
- Throws:
java.lang.NullPointerException
- If the supplied context isnull
PropertyNotFoundException
- If a property/variable resolution failed because no match was found or a match was found but was not readableELException
- Wraps any exception throw whilst resolving a property or variable
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getExpectedType
public abstract java.lang.Class<?> getExpectedType()
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getValueReference
public ValueReference getValueReference(ELContext context)
- Parameters:
context
- The EL context for this evaluation- Returns:
- This default implementation always returns
null
- Since:
- EL 2.2
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