| org.apache.beehive.netui.script.ExpressionEvaluator
All known Subclasses: org.apache.beehive.netui.script.el.ExpressionEvaluatorImpl,
| ExpressionEvaluator | | public interface ExpressionEvaluator (Code) | | Interface for implementing a runtime for evaluating expressions. An ExpressionEvaluator is
used to execute read and update expressions. It also provides a set of methods
for performing utility type operations on expressions.
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| changeContext | | public String changeContext(String expression, String oldContext, String newContext, int lookupIndex) throws ExpressionEvaluationException(Code) | | Change the evaluation context of an expression. This is used to rewrite some expressions
that need to be qualified into a different context for evaluation. The context
of an expression is its first identifier, up to the first delimiter.
Parameters:
expression - the expression whose context to change
Parameters:
oldContext - the old context to replace, if present
Parameters:
newContext - the new context to replace if the expression starts with the oldContext
Parameters:
lookupIndex - an index used to qualify an expression into an array look-up. |
| containsExpression | | public boolean containsExpression(String expression)(Code) | | Checks to see if a particular expression contains an expression. This method will return
true if there is an expression surrounded by whitespace, other expressions,
or literal text.
Parameters:
expression - the expression to check true if the expression contains an expression; false otherwise. |
| evaluateStrict | | public Object evaluateStrict(String expression, VariableResolver variableResolver) throws ExpressionEvaluationException(Code) | | Evaluate an expression and return the result.
Parameters:
expression - the expression to evaluate
Parameters:
variableResolver - the set of contexts that may be used in expression evaluation. This setis not necessarily complete as some objects that can be used as top-level expression contextsmay be contained within an object available in this JavaBean.
throws:
ExpressionEvaluationException - when an error occurs |
| isExpression | | public boolean isExpression(String expression)(Code) | | Checks to see if a particular String is exactly an expression.
Parameters:
expression - the expression to check true if the expression is exactly an expression; false otherwise.
throws:
IllegalExpressionException - if the given expression expression is not legal. |
| parseExpression | | public Expression parseExpression(String expression)(Code) | | Parse an expression into its object representation as a
Expression .
Parameters:
expression - the String expression to parse the parsed expression |
| qualify | | public String qualify(String implicitObjectName, String expression) throws ExpressionEvaluationException(Code) | | Qualify the expression into the given context. This will take the expression
and simply qualify it into the new context implicitObjectName.
Parameters:
implicitObjectName - the new context
Parameters:
expression - the expression to qualify the new expression created by adding the implicit object name implicitObjectNameto the expression string expression
throws:
ExpressionEvaluationException - if an exception occurs qualifying the expression with the implict object name |
| update | | public void update(String expression, Object value, VariableResolver variableResolver, boolean requestParameter) throws ExpressionUpdateException(Code) | | Update an expression with the given value. This will apply the parameter value
to the object referenced by the expression expression. The requestParameter
flag is used by a caller to restrict the set of contexts into which an update can occur on
the request.
Parameters:
expression - the expression whose value to update
Parameters:
value - the new value for the update
Parameters:
variableResolver - the set of contexts that may be used in expression evaluation. This setis not necessarily complete as some objects that can be used as top-level expression contextsmay be contained within an object available in this JavaBean.
Parameters:
requestParameter - a boolean that marks this update as occurring from data in the request, iftrue or simply as a regular update.
throws:
ExpressionUpdateException - when an exception occurs updating a value |
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