Class FunctionExpression<S>
java.lang.Object
org.springframework.integration.expression.FunctionExpression<S>
- Type Parameters:
S- The evaluation context root object type.
- All Implemented Interfaces:
org.springframework.expression.Expression
public class FunctionExpression<S>
extends Object
implements org.springframework.expression.Expression
An
Expression that simply invokes Function.apply(Object) on its
provided Function.
This is a powerful alternative to the SpEL, when Java 8 and its Lambda support is in use.
If the target component has support for an Expression property,
a FunctionExpression can be specified instead of a
SpelExpression
as an alternative to evaluate the value from the Lambda, rather than runtime SpEL resolution.
The FunctionExpression is 'read-only', hence only getValue() operations
are allowed.
Any setValue(org.springframework.expression.EvaluationContext, java.lang.Object) operations and getValueType() related operations
throw EvaluationException.
- Since:
- 5.0
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionfinal StringgetValue()<T> T<T> TgetValue(org.springframework.expression.EvaluationContext context) <T> T<T> TgetValue(org.springframework.expression.EvaluationContext context, Object rootObject, Class<T> desiredResultType) Class<?>Class<?>getValueType(Object rootObject) Class<?>getValueType(org.springframework.expression.EvaluationContext context) Class<?>getValueType(org.springframework.expression.EvaluationContext context, Object rootObject) org.springframework.core.convert.TypeDescriptororg.springframework.core.convert.TypeDescriptorgetValueTypeDescriptor(Object rootObject) org.springframework.core.convert.TypeDescriptorgetValueTypeDescriptor(org.springframework.expression.EvaluationContext context) org.springframework.core.convert.TypeDescriptorgetValueTypeDescriptor(org.springframework.expression.EvaluationContext context, Object rootObject) booleanisWritable(Object rootObject) booleanisWritable(org.springframework.expression.EvaluationContext context) booleanisWritable(org.springframework.expression.EvaluationContext context, Object rootObject) voidvoidvoid
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Constructor Details
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FunctionExpression
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Method Details
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getValue
- Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public Object getValue(@Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public <T> T getValue(@Nullable Class<T> desiredResultType) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public <T> T getValue(@Nullable Object rootObject, @Nullable Class<T> desiredResultType) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public Object getValue(org.springframework.expression.EvaluationContext context) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public Object getValue(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public <T> T getValue(org.springframework.expression.EvaluationContext context, @Nullable Class<T> desiredResultType) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValue
@Nullable public <T> T getValue(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject, @Nullable Class<T> desiredResultType) throws org.springframework.expression.EvaluationException - Specified by:
getValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueType
- Specified by:
getValueTypein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueType
public Class<?> getValueType(@Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueType
public Class<?> getValueType(org.springframework.expression.EvaluationContext context) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueType
public Class<?> getValueType(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueTypeDescriptor
public org.springframework.core.convert.TypeDescriptor getValueTypeDescriptor() throws org.springframework.expression.EvaluationException- Specified by:
getValueTypeDescriptorin interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueTypeDescriptor
public org.springframework.core.convert.TypeDescriptor getValueTypeDescriptor(@Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypeDescriptorin interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueTypeDescriptor
public org.springframework.core.convert.TypeDescriptor getValueTypeDescriptor(org.springframework.expression.EvaluationContext context) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypeDescriptorin interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getValueTypeDescriptor
public org.springframework.core.convert.TypeDescriptor getValueTypeDescriptor(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
getValueTypeDescriptorin interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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setValue
public void setValue(org.springframework.expression.EvaluationContext context, @Nullable Object value) throws org.springframework.expression.EvaluationException - Specified by:
setValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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setValue
public void setValue(@Nullable Object rootObject, @Nullable Object value) throws org.springframework.expression.EvaluationException - Specified by:
setValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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setValue
public void setValue(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject, @Nullable Object value) throws org.springframework.expression.EvaluationException - Specified by:
setValuein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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isWritable
public boolean isWritable(org.springframework.expression.EvaluationContext context) throws org.springframework.expression.EvaluationException - Specified by:
isWritablein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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isWritable
public boolean isWritable(org.springframework.expression.EvaluationContext context, @Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
isWritablein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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isWritable
public boolean isWritable(@Nullable Object rootObject) throws org.springframework.expression.EvaluationException - Specified by:
isWritablein interfaceorg.springframework.expression.Expression- Throws:
org.springframework.expression.EvaluationException
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getExpressionString
- Specified by:
getExpressionStringin interfaceorg.springframework.expression.Expression
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