com.rabbitmq.jms.parse.sql

Class SqlEvaluator

java.lang.Object

com.rabbitmq.jms.parse.sql.SqlEvaluator

All Implemented Interfaces:

Evaluator

public class SqlEvaluator
extends java.lang.Object
implements Evaluator

A boolean evaluator for JMS Sql selector expressions.

Constructor Summary

Constructors

Constructor and Description
SqlEvaluator(SqlParser parser, java.util.Map<java.lang.String,SqlExpressionType> identTypes)

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(java.util.Map<java.lang.String,java.lang.Object> env) Evaluates the (given) expression with the environment given.
boolean	evaluatorOk() This call is idempotent.
java.lang.String	getErrorMessage() This call is idempotent.
com.rabbitmq.jms.parse.sql.SqlParseTree	typedParseTree()

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlEvaluator

public SqlEvaluator(SqlParser parser,
                    java.util.Map<java.lang.String,SqlExpressionType> identTypes)

Method Detail

evaluate

public boolean evaluate(java.util.Map<java.lang.String,java.lang.Object> env)

Description copied from interface: Evaluator

Evaluates the (given) expression with the environment given. This call should not fail, provided Evaluator.evaluatorOk() is true.

Specified by:

evaluate in interface Evaluator

Parameters:

env - - the values of the variables used when evaluating the expression

Returns:

the evaluated result: true or false

typedParseTree

public com.rabbitmq.jms.parse.sql.SqlParseTree typedParseTree()

Returns:

the type-checked parse tree used for evaluation; null if evaluatorOk() is false.

evaluatorOk

public boolean evaluatorOk()

Description copied from interface: Evaluator

This call is idempotent.

Specified by:

evaluatorOk in interface Evaluator

Returns:

true if the evaluator can run cleanly; false otherwise

getErrorMessage

public java.lang.String getErrorMessage()

Description copied from interface: Evaluator

This call is idempotent.

Specified by:

getErrorMessage in interface Evaluator

Returns:

null if evaluatorOk() is false; otherwise an error message denoting the type of failure to initialise.