ognl

Class Ognl

java.lang.Object

ognl.Ognl

public abstract class Ognl
extends java.lang.Object

This class provides static methods for parsing and interpreting OGNL expressions.

The simplest use of the Ognl class is to get the value of an expression from an object, without extra context or pre-parsing.

 import ognl.Ognl; import ognl.OgnlException; try { result = Ognl.getValue(expression, root); }
 catch (OgnlException ex) { // Report error or recover }

 

This will parse the expression given and evaluate it against the root object given, returning the result. If there is an error in the expression, such as the property is not found, the exception is encapsulated into an OgnlException.

Other more sophisticated uses of Ognl can pre-parse expressions. This provides two advantages: in the case of user-supplied expressions it allows you to catch parse errors before evaluation and it allows you to cache parsed expressions into an AST for better speed during repeated use. The pre-parsed expression is always returned as an Object to simplify use for programs that just wish to store the value for repeated use and do not care that it is an AST. If it does care it can always safely cast the value to an AST type.

The Ognl class also takes a context map as one of the parameters to the set and get methods. This allows you to put your own variables into the available namespace for OGNL expressions. The default context contains only the #root and #context keys, which are required to be present. The addDefaultContext(Object, Map) method will alter an existing Map to put the defaults in. Here is an example that shows how to extract the documentName property out of the root object and append a string with the current user name in parens:

 private Map context = new HashMap(); public void setUserName(String value) {
 context.put("userName", value); } try { // get value using our own custom context map result =
 Ognl.getValue("documentName + \" (\" + ((#userName == null) ? \"<nobody>\" : #userName) +
 \")\"", context, root); } catch (OgnlException ex) { // Report error or recover }

 

Version:

27 June 1999

Author:

Luke Blanshard (blanshlu@netscape.net), Drew Davidson (drew@ognl.org)

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.Map	addDefaultContext(java.lang.Object root, ClassResolver classResolver, java.util.Map context) Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.
static java.util.Map	addDefaultContext(java.lang.Object root, ClassResolver classResolver, TypeConverter converter, java.util.Map context) Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.
static java.util.Map	addDefaultContext(java.lang.Object root, java.util.Map context) Deprecated. will be removed soon
static java.util.Map	addDefaultContext(java.lang.Object root, MemberAccess memberAccess, ClassResolver classResolver, TypeConverter converter, java.util.Map context) Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.
static Node	compileExpression(OgnlContext context, java.lang.Object root, java.lang.String expression) Parses and compiles the given expression using the OgnlExpressionCompiler returned from OgnlRuntime.getCompiler().
static java.util.Map	createDefaultContext(java.lang.Object root) Deprecated. it will be removed soon
static java.util.Map	createDefaultContext(java.lang.Object root, ClassResolver classResolver) Deprecated. it will be removed soon
static java.util.Map	createDefaultContext(java.lang.Object root, ClassResolver classResolver, TypeConverter converter) Deprecated. it will be removed soon
static java.util.Map	createDefaultContext(java.lang.Object root, MemberAccess memberAccess) Creates and returns a new standard naming context for evaluating an OGNL expression.
static java.util.Map	createDefaultContext(java.lang.Object root, MemberAccess memberAccess, ClassResolver classResolver, TypeConverter converter) Creates and returns a new standard naming context for evaluating an OGNL expression.
static ClassResolver	getClassResolver(java.util.Map context) Deprecated. it always return null, access to class resolver was prohibited
static Evaluation	getLastEvaluation(java.util.Map context) Gets the last Evaluation executed on the given context.
static java.lang.Object	getRoot(java.util.Map context) Gets the stored root object for the given context - if any.
static TypeConverter	getTypeConverter(java.util.Map context) Gets the currently configured TypeConverter for the given context - if any.
static java.lang.Object	getValue(ExpressionAccessor expression, OgnlContext context, java.lang.Object root) Gets the value represented by the given pre-compiled expression on the specified root object.
static java.lang.Object	getValue(ExpressionAccessor expression, OgnlContext context, java.lang.Object root, java.lang.Class resultType) Gets the value represented by the given pre-compiled expression on the specified root object.
static java.lang.Object	getValue(java.lang.Object tree, java.util.Map context, java.lang.Object root) Evaluates the given OGNL expression tree to extract a value from the given root object.
static java.lang.Object	getValue(java.lang.Object tree, java.util.Map context, java.lang.Object root, java.lang.Class resultType) Evaluates the given OGNL expression tree to extract a value from the given root object.
static java.lang.Object	getValue(java.lang.Object tree, java.lang.Object root) Deprecated. it will be removed soon
static java.lang.Object	getValue(java.lang.Object tree, java.lang.Object root, java.lang.Class resultType) Evaluates the given OGNL expression tree to extract a value from the given root object.
static java.lang.Object	getValue(java.lang.String expression, java.util.Map context, java.lang.Object root) Evaluates the given OGNL expression to extract a value from the given root object in a given context
static java.lang.Object	getValue(java.lang.String expression, java.util.Map context, java.lang.Object root, java.lang.Class resultType) Evaluates the given OGNL expression to extract a value from the given root object in a given context
static java.lang.Object	getValue(java.lang.String expression, java.lang.Object root) Convenience method that combines calls to parseExpression and getValue.
static java.lang.Object	getValue(java.lang.String expression, java.lang.Object root, java.lang.Class resultType) Convenience method that combines calls to parseExpression and getValue.
static boolean	isConstant(java.lang.Object tree) Same as isConstant(Object, java.util.Map) - only the Map context is created for you.
static boolean	isConstant(java.lang.Object tree, java.util.Map context) Checks if the specified Node instance represents a constant expression.
static boolean	isConstant(java.lang.String expression) Same as isConstant(String, java.util.Map) - only the Map instance is created for you.
static boolean	isConstant(java.lang.String expression, java.util.Map context) Checks if the specified expression represents a constant expression.
static boolean	isSimpleNavigationChain(java.lang.Object tree)
static boolean	isSimpleNavigationChain(java.lang.Object tree, java.util.Map context)
static boolean	isSimpleNavigationChain(java.lang.String expression)
static boolean	isSimpleNavigationChain(java.lang.String expression, java.util.Map context)
static boolean	isSimpleProperty(java.lang.Object tree)
static boolean	isSimpleProperty(java.lang.Object tree, java.util.Map context)
static boolean	isSimpleProperty(java.lang.String expression)
static boolean	isSimpleProperty(java.lang.String expression, java.util.Map context)
static java.lang.Object	parseExpression(java.lang.String expression) Parses the given OGNL expression and returns a tree representation of the expression that can be used by Ognl static methods.
static void	setClassResolver(java.util.Map context, ClassResolver classResolver) Deprecated. it ignores any attempts to modify ClassResolver, ClassResolver can be defined only when creating a new context
static void	setRoot(java.util.Map context, java.lang.Object root) Sets the root object to use for all expressions in the given context - doesn't necessarily replace root object instances explicitly passed in to other expression resolving methods on this class.
static void	setTypeConverter(java.util.Map context, TypeConverter converter) Deprecated. do not use
static void	setValue(ExpressionAccessor expression, OgnlContext context, java.lang.Object root, java.lang.Object value) Sets the value given using the pre-compiled expression on the specified root object.
static void	setValue(java.lang.Object tree, java.util.Map context, java.lang.Object root, java.lang.Object value) Evaluates the given OGNL expression tree to insert a value into the object graph rooted at the given root object.
static void	setValue(java.lang.Object tree, java.lang.Object root, java.lang.Object value) Evaluates the given OGNL expression tree to insert a value into the object graph rooted at the given root object.
static void	setValue(java.lang.String expression, java.util.Map context, java.lang.Object root, java.lang.Object value) Evaluates the given OGNL expression to insert a value into the object graph rooted at the given root object given the context.
static void	setValue(java.lang.String expression, java.lang.Object root, java.lang.Object value) Convenience method that combines calls to parseExpression and setValue.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

parseExpression

public static java.lang.Object parseExpression(java.lang.String expression)
                                        throws OgnlException

Parses the given OGNL expression and returns a tree representation of the expression that can be used by Ognl static methods.

Parameters:

expression - the OGNL expression to be parsed

Returns:

a tree representation of the expression

Throws:

ExpressionSyntaxException - if the expression is malformed

OgnlException - if there is a pathological environmental problem

compileExpression

public static Node compileExpression(OgnlContext context,
                     java.lang.Object root,
                     java.lang.String expression)
                              throws java.lang.Exception

Parses and compiles the given expression using the OgnlExpressionCompiler returned from OgnlRuntime.getCompiler().

Parameters:

context - The context to use.

root - The root object for the given expression.

expression - The expression to compile.

Returns:

The node with a compiled accessor set on Node.getAccessor() if compilation was successfull. In instances where compilation wasn't possible because of a partially null expression the ExpressionAccessor instance may be null and the compilation of this expression still possible at some as yet indertermined point in the future.

Throws:

java.lang.Exception - If a compilation error occurs.

createDefaultContext

@Deprecated
public static java.util.Map createDefaultContext(java.lang.Object root)

Deprecated. it will be removed soon

Creates and returns a new standard naming context for evaluating an OGNL expression.

Parameters:

root - the root of the object graph

Returns:

a new Map with the keys root and context set appropriately

createDefaultContext

@Deprecated
public static java.util.Map createDefaultContext(java.lang.Object root,
                                            ClassResolver classResolver)

Deprecated. it will be removed soon

Creates and returns a new standard naming context for evaluating an OGNL expression.

Parameters:

root - The root of the object graph.

classResolver - The resolver used to instantiate Class instances referenced in the expression.

Returns:

a new OgnlContext with the keys root and context set appropriately

createDefaultContext

@Deprecated
public static java.util.Map createDefaultContext(java.lang.Object root,
                                            ClassResolver classResolver,
                                            TypeConverter converter)

Deprecated. it will be removed soon

Creates and returns a new standard naming context for evaluating an OGNL expression.

Parameters:

root - The root of the object graph.

classResolver - The resolver used to instantiate Class instances referenced in the expression.

converter - Converter used to convert return types of an expression in to their desired types.

Returns:

a new Map with the keys root and context set appropriately

createDefaultContext

public static java.util.Map createDefaultContext(java.lang.Object root,
                                 MemberAccess memberAccess,
                                 ClassResolver classResolver,
                                 TypeConverter converter)

Creates and returns a new standard naming context for evaluating an OGNL expression.

Parameters:

root - The root of the object graph.

memberAccess - Java security handling object to determine semantics for accessing normally private/protected methods / fields.

classResolver - The resolver used to instantiate Class instances referenced in the expression.

converter - Converter used to convert return types of an expression in to their desired types.

Returns:

a new Map with the keys root and context set appropriately

createDefaultContext

public static java.util.Map createDefaultContext(java.lang.Object root,
                                 MemberAccess memberAccess)

Creates and returns a new standard naming context for evaluating an OGNL expression.

Parameters:

root - The root of the object graph.

memberAccess - Java security handling object to determine semantics for accessing normally private/protected methods / fields.

Returns:

a new Map with the keys root and context set appropriately

addDefaultContext

@Deprecated
public static java.util.Map addDefaultContext(java.lang.Object root,
                                         java.util.Map context)

Deprecated. will be removed soon

Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.

Parameters:

root - the root of the object graph

context - the context to which OGNL context will be added.

Returns:

Context Map with the keys root and context set appropriately

addDefaultContext

public static java.util.Map addDefaultContext(java.lang.Object root,
                              ClassResolver classResolver,
                              java.util.Map context)

Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.

Parameters:

root - The root of the object graph.

classResolver - The resolver used to instantiate Class instances referenced in the expression.

context - The context to which OGNL context will be added.

Returns:

Context Map with the keys root and context set appropriately

addDefaultContext

public static java.util.Map addDefaultContext(java.lang.Object root,
                              ClassResolver classResolver,
                              TypeConverter converter,
                              java.util.Map context)

Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.

Parameters:

root - The root of the object graph.

classResolver - The resolver used to instantiate Class instances referenced in the expression.

converter - Converter used to convert return types of an expression in to their desired types.

context - The context to which OGNL context will be added.

Returns:

Context Map with the keys root and context set appropriately

addDefaultContext

public static java.util.Map addDefaultContext(java.lang.Object root,
                              MemberAccess memberAccess,
                              ClassResolver classResolver,
                              TypeConverter converter,
                              java.util.Map context)

Appends the standard naming context for evaluating an OGNL expression into the context given so that cached maps can be used as a context.

Parameters:

root - the root of the object graph

memberAccess - Definition for handling private/protected access.

classResolver - The class loading resolver that should be used to resolve class references.

converter - The type converter to be used by default.

context - Default context to use, if not an OgnlContext will be dumped into a new OgnlContext object.

Returns:

Context Map with the keys root and context set appropriately

setClassResolver

public static void setClassResolver(java.util.Map context,
                    ClassResolver classResolver)

Deprecated. it ignores any attempts to modify ClassResolver, ClassResolver can be defined only when creating a new context

Configures the ClassResolver to use for the given context. Will be used during expression parsing / execution to resolve class names.

Parameters:

context - The context to place the resolver.

classResolver - The resolver to use to resolve classes.

getClassResolver

public static ClassResolver getClassResolver(java.util.Map context)

Deprecated. it always return null, access to class resolver was prohibited

Gets the previously stored ClassResolver for the given context - if any.

Parameters:

context - The context to get the configured resolver from.

Returns:

The resolver instance, or null if none found.

setTypeConverter

@Deprecated
public static void setTypeConverter(java.util.Map context,
                               TypeConverter converter)

Deprecated. do not use

Configures the type converter to use for a given context. This will be used to convert into / out of various java class types.

Parameters:

context - The context to configure it for.

converter - The converter to use.

getTypeConverter

public static TypeConverter getTypeConverter(java.util.Map context)

Gets the currently configured TypeConverter for the given context - if any.

Parameters:

context - The context to get the converter from.

Returns:

The converter - or null if none found.

setRoot

public static void setRoot(java.util.Map context,
           java.lang.Object root)

Sets the root object to use for all expressions in the given context - doesn't necessarily replace root object instances explicitly passed in to other expression resolving methods on this class.

Parameters:

context - The context to store the root object in.

root - The root object.

getRoot

public static java.lang.Object getRoot(java.util.Map context)

Gets the stored root object for the given context - if any.

Parameters:

context - The context to get the root object from.

Returns:

The root object - or null if none found.

getLastEvaluation

public static Evaluation getLastEvaluation(java.util.Map context)

Gets the last Evaluation executed on the given context.

Parameters:

context - The context to get the evaluation from.

Returns:

The Evaluation - or null if none was found.

getValue

public static java.lang.Object getValue(java.lang.Object tree,
                        java.util.Map context,
                        java.lang.Object root)
                                 throws OgnlException

Evaluates the given OGNL expression tree to extract a value from the given root object. The default context is set for the given context and root via addDefaultContext().

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

context - the naming context for the evaluation

root - the root object for the OGNL expression

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

getValue

public static java.lang.Object getValue(java.lang.Object tree,
                        java.util.Map context,
                        java.lang.Object root,
                        java.lang.Class resultType)
                                 throws OgnlException

Evaluates the given OGNL expression tree to extract a value from the given root object. The default context is set for the given context and root via addDefaultContext().

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

context - the naming context for the evaluation

root - the root object for the OGNL expression

resultType - the converted type of the resultant object, using the context's type converter

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

getValue

public static java.lang.Object getValue(ExpressionAccessor expression,
                        OgnlContext context,
                        java.lang.Object root)

Gets the value represented by the given pre-compiled expression on the specified root object.

Parameters:

expression - The pre-compiled expression, as found in Node.getAccessor().

context - The ognl context.

root - The object to retrieve the expression value from.

Returns:

The value.

getValue

public static java.lang.Object getValue(ExpressionAccessor expression,
                        OgnlContext context,
                        java.lang.Object root,
                        java.lang.Class resultType)

Gets the value represented by the given pre-compiled expression on the specified root object.

Parameters:

expression - The pre-compiled expression, as found in Node.getAccessor().

context - The ognl context.

root - The object to retrieve the expression value from.

resultType - The desired object type that the return value should be converted to using the getTypeConverter(java.util.Map) }.

Returns:

The value.

getValue

public static java.lang.Object getValue(java.lang.String expression,
                        java.util.Map context,
                        java.lang.Object root)
                                 throws OgnlException

Evaluates the given OGNL expression to extract a value from the given root object in a given context

Parameters:

expression - the OGNL expression to be parsed

context - the naming context for the evaluation

root - the root object for the OGNL expression

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

See Also:

parseExpression(String), getValue(Object,Object)

getValue

public static java.lang.Object getValue(java.lang.String expression,
                        java.util.Map context,
                        java.lang.Object root,
                        java.lang.Class resultType)
                                 throws OgnlException

Evaluates the given OGNL expression to extract a value from the given root object in a given context

Parameters:

expression - the OGNL expression to be parsed

context - the naming context for the evaluation

root - the root object for the OGNL expression

resultType - the converted type of the resultant object, using the context's type converter

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

See Also:

parseExpression(String), getValue(Object,Object)

getValue

@Deprecated
public static java.lang.Object getValue(java.lang.Object tree,
                                   java.lang.Object root)
                                 throws OgnlException

Deprecated. it will be removed soon

Evaluates the given OGNL expression tree to extract a value from the given root object.

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

root - the root object for the OGNL expression

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

getValue

public static java.lang.Object getValue(java.lang.Object tree,
                        java.lang.Object root,
                        java.lang.Class resultType)
                                 throws OgnlException

Evaluates the given OGNL expression tree to extract a value from the given root object.

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

root - the root object for the OGNL expression

resultType - the converted type of the resultant object, using the context's type converter

Returns:

the result of evaluating the expression

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

getValue

public static java.lang.Object getValue(java.lang.String expression,
                        java.lang.Object root)
                                 throws OgnlException

Convenience method that combines calls to parseExpression and getValue.

Parameters:

expression - the OGNL expression to be parsed

root - the root object for the OGNL expression

Returns:

the result of evaluating the expression

Throws:

ExpressionSyntaxException - if the expression is malformed

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

See Also:

parseExpression(String), getValue(Object,Object)

getValue

public static java.lang.Object getValue(java.lang.String expression,
                        java.lang.Object root,
                        java.lang.Class resultType)
                                 throws OgnlException

Convenience method that combines calls to parseExpression and getValue.

Parameters:

expression - the OGNL expression to be parsed

root - the root object for the OGNL expression

resultType - the converted type of the resultant object, using the context's type converter

Returns:

the result of evaluating the expression

Throws:

ExpressionSyntaxException - if the expression is malformed

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

See Also:

parseExpression(String), getValue(Object,Object)

setValue

public static void setValue(java.lang.Object tree,
            java.util.Map context,
            java.lang.Object root,
            java.lang.Object value)
                     throws OgnlException

Evaluates the given OGNL expression tree to insert a value into the object graph rooted at the given root object. The default context is set for the given context and root via addDefaultContext().

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

context - the naming context for the evaluation

root - the root object for the OGNL expression

value - the value to insert into the object graph

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

setValue

public static void setValue(ExpressionAccessor expression,
            OgnlContext context,
            java.lang.Object root,
            java.lang.Object value)

Sets the value given using the pre-compiled expression on the specified root object.

Parameters:

expression - The pre-compiled expression, as found in Node.getAccessor().

context - The ognl context.

root - The object to set the expression value on.

value - The value to set.

setValue

public static void setValue(java.lang.String expression,
            java.util.Map context,
            java.lang.Object root,
            java.lang.Object value)
                     throws OgnlException

Evaluates the given OGNL expression to insert a value into the object graph rooted at the given root object given the context.

Parameters:

expression - the OGNL expression to be parsed

root - the root object for the OGNL expression

context - the naming context for the evaluation

value - the value to insert into the object graph

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

setValue

public static void setValue(java.lang.Object tree,
            java.lang.Object root,
            java.lang.Object value)
                     throws OgnlException

Evaluates the given OGNL expression tree to insert a value into the object graph rooted at the given root object.

Parameters:

tree - the OGNL expression tree to evaluate, as returned by parseExpression()

root - the root object for the OGNL expression

value - the value to insert into the object graph

Throws:

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

setValue

public static void setValue(java.lang.String expression,
            java.lang.Object root,
            java.lang.Object value)
                     throws OgnlException

Convenience method that combines calls to parseExpression and setValue.

Parameters:

expression - the OGNL expression to be parsed

root - the root object for the OGNL expression

value - the value to insert into the object graph

Throws:

ExpressionSyntaxException - if the expression is malformed

MethodFailedException - if the expression called a method which failed

NoSuchPropertyException - if the expression referred to a nonexistent property

InappropriateExpressionException - if the expression can't be used in this context

OgnlException - if there is a pathological environmental problem

See Also:

parseExpression(String), setValue(Object,Object,Object)

isConstant

public static boolean isConstant(java.lang.Object tree,
                 java.util.Map context)
                          throws OgnlException

Checks if the specified Node instance represents a constant expression.

Parameters:

tree - The Node to check.

context - The context to use.

Returns:

True if the node is a constant - false otherwise.

Throws:

OgnlException - If an error occurs checking the expression.

isConstant

public static boolean isConstant(java.lang.String expression,
                 java.util.Map context)
                          throws OgnlException

Checks if the specified expression represents a constant expression.

Parameters:

expression - The expression to check.

context - The context to use.

Returns:

True if the node is a constant - false otherwise.

Throws:

OgnlException - If an error occurs checking the expression.

isConstant

public static boolean isConstant(java.lang.Object tree)
                          throws OgnlException

Same as isConstant(Object, java.util.Map) - only the Map context is created for you.

Parameters:

tree - The Node to check.

Returns:

True if the node represents a constant expression - false otherwise.

Throws:

OgnlException - If an exception occurs.

isConstant

public static boolean isConstant(java.lang.String expression)
                          throws OgnlException

Same as isConstant(String, java.util.Map) - only the Map instance is created for you.

Parameters:

expression - The expression to check.

Returns:

True if the expression represents a constant - false otherwise.

Throws:

OgnlException - If an exception occurs.

isSimpleProperty

public static boolean isSimpleProperty(java.lang.Object tree,
                       java.util.Map context)
                                throws OgnlException

Throws:

OgnlException

isSimpleProperty

public static boolean isSimpleProperty(java.lang.String expression,
                       java.util.Map context)
                                throws OgnlException

Throws:

OgnlException

isSimpleProperty

public static boolean isSimpleProperty(java.lang.Object tree)
                                throws OgnlException

Throws:

OgnlException

isSimpleProperty

public static boolean isSimpleProperty(java.lang.String expression)
                                throws OgnlException

Throws:

OgnlException

isSimpleNavigationChain

public static boolean isSimpleNavigationChain(java.lang.Object tree,
                              java.util.Map context)
                                       throws OgnlException

Throws:

OgnlException

isSimpleNavigationChain

public static boolean isSimpleNavigationChain(java.lang.String expression,
                              java.util.Map context)
                                       throws OgnlException

Throws:

OgnlException

isSimpleNavigationChain

public static boolean isSimpleNavigationChain(java.lang.Object tree)
                                       throws OgnlException

Throws:

OgnlException

isSimpleNavigationChain

public static boolean isSimpleNavigationChain(java.lang.String expression)
                                       throws OgnlException

Throws:

OgnlException