com.rabbitmq.jms.parse.sql

Class SqlTypeSetterVisitor

java.lang.Object

com.rabbitmq.jms.parse.sql.SqlTypeSetterVisitor

All Implemented Interfaces:

Visitor<com.rabbitmq.jms.parse.sql.SqlTreeNode>

public class SqlTypeSetterVisitor
extends java.lang.Object
implements Visitor<com.rabbitmq.jms.parse.sql.SqlTreeNode>

This visitor sets the type of the expression at a node of a tree, using the type of node and the SqlExpressionType of the children nodes.

To type a whole tree this can be applied to it by visiting the subtrees in ‘post-order’; each node visited then has its child nodes already visited and therefore typed. In consequence, this visitor does nothing in its Visitor.visitBefore(Object, Object[]) implementation.

The visitor has a (final) map state which pre-specifies the SqlExpressionType of some identifiers, otherwise identifiers are of type SqlExpressionType.ANY.

Constructor Summary

Constructors

Constructor and Description
SqlTypeSetterVisitor()
SqlTypeSetterVisitor(java.util.Map<java.lang.String,SqlExpressionType> identifierType)

Method Summary

Modifier and Type	Method and Description
boolean	visitAfter(com.rabbitmq.jms.parse.sql.SqlTreeNode parent, com.rabbitmq.jms.parse.sql.SqlTreeNode[] children) Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.
boolean	visitBefore(com.rabbitmq.jms.parse.sql.SqlTreeNode parent, com.rabbitmq.jms.parse.sql.SqlTreeNode[] children) Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlTypeSetterVisitor

public SqlTypeSetterVisitor(java.util.Map<java.lang.String,SqlExpressionType> identifierType)

SqlTypeSetterVisitor

public SqlTypeSetterVisitor()

Method Detail

visitBefore

public boolean visitBefore(com.rabbitmq.jms.parse.sql.SqlTreeNode parent,
                           com.rabbitmq.jms.parse.sql.SqlTreeNode[] children)

Description copied from interface: Visitor

Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Specified by:

visitBefore in interface Visitor<com.rabbitmq.jms.parse.sql.SqlTreeNode>

Parameters:

parent - - the node (value) of the parent at this point in the tree; can be updated.

children - - array of the nodes of the children of this parent (can be zero-length array; must not be null).

Returns:

true or false - interpreted by the caller (typically a tree traversal algorithm).

visitAfter

public boolean visitAfter(com.rabbitmq.jms.parse.sql.SqlTreeNode parent,
                          com.rabbitmq.jms.parse.sql.SqlTreeNode[] children)

Description copied from interface: Visitor

Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Specified by:

visitAfter in interface Visitor<com.rabbitmq.jms.parse.sql.SqlTreeNode>

Parameters:

parent - - the node (value) of the parent at this point in the tree; can be updated.

children - - array of the nodes of the children of this parent (can be zero-length array; must not be null).

Returns:

true or false - interpreted by the caller (typically a tree traversal algorithm).