com.codestreet.selector.parser
Interface IValueProvider

All Known Implementing Classes:

AbstractValueProvider, ValueProvider, ValueProvider

public interface IValueProvider

Value provider interface. A value provider allows an application to provide identifier values on demand. As a selector is evaluated, callbacks are made on the value provider when an identifier's value is needed.

Author:

Jawaid Hakim.

See Also:

Selector

Method Summary

java.lang.Object

getValue(java.lang.Object identifier, java.lang.Object correlation) Get value of specified identifier.

Method Detail

getValue

public java.lang.Object getValue(java.lang.Object identifier,
                                 java.lang.Object correlation)

Get value of specified identifier.

Parameters:

identifier - Identifier.

correlation - Correlation data. May be null.

Returns:

Value of specified identifier. Returns null if identifier is not found. Numeric values - Integer, Short, Long, Float, Double, and Byte - MUST be wrapped in an instance of NumericValue.

See Also:

NumericValue