FilterParser (olingo-odata2-core 3.0.0-SP.19 API)

All Known Implementing Classes:

FilterParserImpl, OrderByParserImpl
```
public interface FilterParser
```
Interface which defines a method for parsing a $filter expression to allow different parser implementations
The current expression parser supports expressions as defined in the OData specification 2.0 with the following restrictions - the methods "cast", "isof" and "replace" are not supported The expression parser can be used with providing an Entity Data Model (EDM) an without providing it.
When a EDM is provided the expression parser will be as strict as possible. That means:
- All properties used in the expression must be defined inside the EDM
- The types of EDM properties will be checked against the lists of allowed type per method, binary- and unary operator
If no EDM is provided the expression parser performs a lax validation
- The properties used in the expression are not looked up inside the EDM and the type of the expression node representing the property will be "null"
- Expression node with EDM-types which are "null" are not considered during the parameter type validation, to the return type of the parent expression node will also become "null"

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`FilterExpression`	`parseFilterString(String expression)`	Parses a $filter expression string and creates an $orderby expression tree.

- Method Detail
  - parseFilterString
```
FilterExpression parseFilterString(String expression)
                            throws ExpressionParserException,
                                   ODataMessageException
```
    Parses a $filter expression string and creates an $orderby expression tree.
    
    Parameters:
    
    expression - The $filter expression string ( for example "city eq 'Sydney'" ) to be parsed
    
    Returns:
    
    Expression tree which can be traversed with help of the interfaces ExpressionVisitor and Visitable
    
    Throws:
    
    ExpressionParserException - Exception thrown due to errors while parsing the $filter expression string
    
    ODataMessageException - Used for extensibility