com.codestreet.selector.parser
Class Identifier

java.lang.Object
  com.codestreet.selector.parser.Identifier

All Implemented Interfaces:

IExpression

public final class Identifier

extends java.lang.Object

implements IExpression

Class to represent an identifier. Thread safe class may be freely used across threads. Identifiers can either be JMS header fields, or JMS provider-specific properties, or application properties.

The following JMS header fields are supported: JMSDeliveryMode, JMSPriority, JMSMessageID, JMSTimestamp, JMSCorrelationID, and JMSType. In addition, the header fields JMSRedelivered and JMSExpiration are also supported. These additional fields are relevant only for the receiving application and not for the sender.

Support is provided for nested fields. Nested fields are referenced using a dot notation. For example, order.quantity would select the quantity field of the nested sub-message field order if it exists. Otherwise, it selects nothing (null).

Author:

Jawaid Hakim.

Method Summary

java.lang.Object	eval(IValueProvider provider, java.lang.Object corr) Evaluate the expression.
java.lang.Object	eval(java.util.Map identifiers) Evaluate the expression.
java.lang.String	getIdentifier() Get identifier name.
boolean	isJMSHeader() Check if this is a JMS header property.
java.lang.String	toString()
static Identifier	valueOf(java.lang.String id) Factory.

Methods inherited from class java.lang.Object

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

Method Detail

valueOf

public static Identifier valueOf(java.lang.String id)

Factory.

Parameters:

id - Identifier name.

Returns:

Instance.

Throws:

java.lang.IllegalArgumentException - Invalid identifier name.

getIdentifier

public java.lang.String getIdentifier()

Get identifier name.

Returns:

Identifier name.

isJMSHeader

public boolean isJMSHeader()

Check if this is a JMS header property.

Returns:

true if this identifier is a JMS header property. Otherwise, returns false.

eval

public java.lang.Object eval(java.util.Map identifiers)

Description copied from interface: IExpression

Evaluate the expression.

Specified by:

eval in interface IExpression

Parameters:

identifiers - Identifier values.

Returns:

Result of the expression evaluation.

eval

public java.lang.Object eval(IValueProvider provider,
                             java.lang.Object corr)

Description copied from interface: IExpression

Evaluate the expression.

Specified by:

eval in interface IExpression

Parameters:

provider - Value provider. During evaluation of the expression callbacks are made on the value provider to get identifier values.

corr - Correlation data. Passed as-is to the value provider.

Returns:

Result evaluating the expression.

toString

public java.lang.String toString()