Jakarta Expression Language 3.0 Implementation 3.0.4 · com.sun.el.MethodExpressionLiteral

Modifier and Type	Field and Description
private Class<?>	expectedType
private String	expr
private Class<?>[]	paramTypes

Access	Constructor and Description
public	MethodExpressionLiteral()
public	MethodExpressionLiteral(String expr, Class<?> expectedType, Class<?>[] paramTypes)

Method Summary

Modifier and Type	Method and Description
public boolean	equals(Object the `Object` to test for equality. obj) Implements abstract javax.el.Expression.equals. Determines whether the specified object is equal to this `Expression`.
public String	getExpressionString() Implements abstract javax.el.Expression.getExpressionString. Returns the original String used to create this `Expression`, unmodified.
public MethodInfo	getMethodInfo(ELContext The context of this evaluation context) Implements abstract javax.el.MethodExpression.getMethodInfo. Evaluates the expression relative to the provided context, and returns information about the actual referenced method.
public int	hashCode() Implements abstract javax.el.Expression.hashCode. Returns the hash code for this `Expression`.
public Object	invoke(ELContext The context of this evaluation. context, Object[] The parameters to pass to the method, or `null` if no parameters. params) Implements abstract javax.el.MethodExpression.invoke. If a String literal is specified as the expression, returns the String literal coerced to the expected return type of the method signature.
public boolean	isLiteralText() Implements abstract javax.el.Expression.isLiteralText. Returns whether this expression was created from only literal text.
public void	readExternal(ObjectInput the stream to read data from in order to restore the object in) Implements java.io.Externalizable.readExternal. The object implements the readExternal method to restore its contents by calling the methods of DataInput for primitive types and readObject for objects, strings and arrays.
public void	writeExternal(ObjectOutput the stream to write the object to out) Implements java.io.Externalizable.writeExternal. The object implements the writeExternal method to save its contents by calling the methods of DataOutput for its primitive values or calling the writeObject method of ObjectOutput for objects, strings, and arrays.

Inherited from javax.el.MethodExpression:: isParametersProvided isParmetersProvided

expectedType	back to summary
private Class<?> expectedType

expr	back to summary
private String expr

paramTypes	back to summary
private Class<?>[] paramTypes

MethodExpressionLiteral	back to summary
public MethodExpressionLiteral()

MethodExpressionLiteral	back to summary
public MethodExpressionLiteral(String expr, Class<?> expectedType, Class<?>[] paramTypes)

Method Detail

equals back to summary

equals	back to summary
public boolean equals(Object obj) Implements abstract javax.el.Expression.equals. Doc from javax.el.Expression.equals. Determines whether the specified object is equal to this `Expression`. The result is `true` if and only if the argument is not `null`, is an `Expression` object that is the of the same type (`ValueExpression` or `MethodExpression`), and has an identical parsed representation. Note that two expressions can be equal if their expression Strings are different. For example, `${fn1:foo()}` and `${fn2:foo()}` are equal if their corresponding `FunctionMapper`s mapped `fn1:foo` and `fn2:foo` to the same method. Parameters obj:Object the `Object` to test for equality. Returns:boolean `true` if `obj` equals this `Expression`; `false` otherwise. Annotations @Override

public boolean equals(Object obj)

Implements abstract javax.el.Expression.equals.

Doc from javax.el.Expression.equals.

Determines whether the specified object is equal to this Expression.

The result is true if and only if the argument is not null, is an Expression object that is the of the same type (ValueExpression or MethodExpression), and has an identical parsed representation.

Note that two expressions can be equal if their expression Strings are different. For example, ${fn1:foo()} and ${fn2:foo()} are equal if their corresponding FunctionMappers mapped fn1:foo and fn2:foo to the same method.

Parameters

obj:Object: the Object to test for equality.

Returns:boolean

true if obj equals this Expression; false otherwise.

Annotations

@Override

getExpressionString back to summary

getExpressionString	back to summary
public String getExpressionString() Implements abstract javax.el.Expression.getExpressionString. Doc from javax.el.Expression.getExpressionString. Returns the original String used to create this `Expression`, unmodified. This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a configuration file has not changed). This method does not provide sufficient information to re-create an expression. Two different expressions can have exactly the same expression string but different function mappings. Serialization should be used to save and restore the state of an `Expression`. Returns:String The original expression String. Annotations @Override

public String getExpressionString()

Implements abstract javax.el.Expression.getExpressionString.

Doc from javax.el.Expression.getExpressionString.

Returns the original String used to create this Expression, unmodified.

This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a configuration file has not changed).

This method does not provide sufficient information to re-create an expression. Two different expressions can have exactly the same expression string but different function mappings. Serialization should be used to save and restore the state of an Expression.

Returns:String

The original expression String.

Annotations

@Override

getMethodInfo back to summary

getMethodInfo	back to summary
public MethodInfo getMethodInfo(ELContext context) throws ELException Implements abstract javax.el.MethodExpression.getMethodInfo. Doc from javax.el.MethodExpression.getMethodInfo. Evaluates the expression relative to the provided context, and returns information about the actual referenced method. Parameters context:ELContext The context of this evaluation Returns:MethodInfo an instance of `MethodInfo` containing information about the method the expression evaluated to. Annotations @Override Exceptions ELException: if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.

public MethodInfo getMethodInfo(ELContext context) throws ELException

Implements abstract javax.el.MethodExpression.getMethodInfo.

Doc from javax.el.MethodExpression.getMethodInfo.

Evaluates the expression relative to the provided context, and returns information about the actual referenced method.

Parameters

context:ELContext: The context of this evaluation

Returns:MethodInfo

an instance of MethodInfo containing information about the method the expression evaluated to.

Annotations

@Override

Exceptions

ELException:: if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available.

hashCode back to summary

hashCode	back to summary
public int hashCode() Implements abstract javax.el.Expression.hashCode. Doc from javax.el.Expression.hashCode. Returns the hash code for this `Expression`. See the note in the `equals` method on how two expressions can be equal if their expression Strings are different. Recall that if two objects are equal according to the `equals(Object)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. Implementations must take special note and implement `hashCode` correctly. Returns:int The hash code for this `Expression`. Annotations @Override

public int hashCode()

Implements abstract javax.el.Expression.hashCode.

Doc from javax.el.Expression.hashCode.

Returns the hash code for this Expression.

See the note in the equals method on how two expressions can be equal if their expression Strings are different. Recall that if two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result. Implementations must take special note and implement hashCode correctly.

Returns:int

The hash code for this Expression.

Annotations

@Override

invoke back to summary

invoke	back to summary
public Object invoke(ELContext context, Object[] params) throws ELException Implements abstract javax.el.MethodExpression.invoke. Doc from javax.el.MethodExpression.invoke. If a String literal is specified as the expression, returns the String literal coerced to the expected return type of the method signature. An `ELException` is thrown if `expectedReturnType` is void or if the coercion of the String literal to the `expectedReturnType` yields an error (see Section "1.18 Type Conversion" of the EL specification). If not a String literal, evaluates the expression relative to the provided context, invokes the method that was found using the supplied parameters, and returns the result of the method invocation. Any parameters passed to this method is ignored if isLiteralText() or isParmetersProvided() is true. Parameters context:ELContext The context of this evaluation. params:Object[] The parameters to pass to the method, or `null` if no parameters. Returns:Object the result of the method invocation (`null` if the method has a `void` return type). Annotations @Override Exceptions ELException: if a String literal is specified and expectedReturnType of the MethodExpression is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion"). if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available. If the exception thrown is an `InvocationTargetException`, extract its `cause` and pass it to the `ELException` constructor.

public Object invoke(ELContext context, Object[] params) throws ELException

Implements abstract javax.el.MethodExpression.invoke.

Doc from javax.el.MethodExpression.invoke.

If a String literal is specified as the expression, returns the String literal coerced to the expected return type of the method signature. An ELException is thrown if expectedReturnType is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion" of the EL specification). If not a String literal, evaluates the expression relative to the provided context, invokes the method that was found using the supplied parameters, and returns the result of the method invocation. Any parameters passed to this method is ignored if isLiteralText() or isParmetersProvided() is true.

Parameters

context:ELContext: The context of this evaluation.
params:Object[]: The parameters to pass to the method, or null if no parameters.

Returns:Object

the result of the method invocation (null if the method has a void return type).

Annotations

@Override

Exceptions

ELException:

if a String literal is specified and expectedReturnType of the MethodExpression is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.18 Type Conversion").
if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available. If the exception thrown is an InvocationTargetException, extract its cause and pass it to the ELException constructor.

isLiteralText back to summary

isLiteralText	back to summary
public boolean isLiteralText() Implements abstract javax.el.Expression.isLiteralText. Doc from javax.el.Expression.isLiteralText. Returns whether this expression was created from only literal text. This method must return `true` if and only if the expression string this expression was created from contained no unescaped EL delimeters (`${...}` or `#{...}`). Returns:boolean `true` if this expression was created from only literal text; `false` otherwise. Annotations @Override

public boolean isLiteralText()

Implements abstract javax.el.Expression.isLiteralText.

Doc from javax.el.Expression.isLiteralText.

Returns whether this expression was created from only literal text.

This method must return true if and only if the expression string this expression was created from contained no unescaped EL delimeters (${...} or #{...}).

Returns:boolean

true if this expression was created from only literal text; false otherwise.

Annotations

@Override

readExternal	back to summary
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException Implements java.io.Externalizable.readExternal. Doc from java.io.Externalizable.readExternal. The object implements the readExternal method to restore its contents by calling the methods of DataInput for primitive types and readObject for objects, strings and arrays. The readExternal method must read the values in the same sequence and with the same types as were written by writeExternal. Parameters in:ObjectInput the stream to read data from in order to restore the object Annotations @Override Exceptions IOException: if I/O errors occur ClassNotFoundException: If the class for an object being restored cannot be found.

readExternal

back to summary

public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException

Implements java.io.Externalizable.readExternal.

Doc from java.io.Externalizable.readExternal.

The object implements the readExternal method to restore its contents by calling the methods of DataInput for primitive types and readObject for objects, strings and arrays. The readExternal method must read the values in the same sequence and with the same types as were written by writeExternal.

Parameters

in:ObjectInput: the stream to read data from in order to restore the object

Annotations

@Override

Exceptions

IOException:: if I/O errors occur
ClassNotFoundException:: If the class for an object being restored cannot be found.

writeExternal	back to summary
public void writeExternal(ObjectOutput out) throws IOException Implements java.io.Externalizable.writeExternal. Doc from java.io.Externalizable.writeExternal. The object implements the writeExternal method to save its contents by calling the methods of DataOutput for its primitive values or calling the writeObject method of ObjectOutput for objects, strings, and arrays. Parameters out:ObjectOutput the stream to write the object to Annotations @Override Exceptions IOException: Includes any I/O exceptions that may occur

writeExternal

back to summary

public void writeExternal(ObjectOutput out) throws IOException

Implements java.io.Externalizable.writeExternal.

Doc from java.io.Externalizable.writeExternal.

The object implements the writeExternal method to save its contents by calling the methods of DataOutput for its primitive values or calling the writeObject method of ObjectOutput for objects, strings, and arrays.

Parameters

out:ObjectOutput: the stream to write the object to

Annotations

@Override

Exceptions

IOException:: Includes any I/O exceptions that may occur

public Class MethodExpressionLiteral

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