org.apache.hadoop.hive.metastore.parser

Class ExpressionTree

java.lang.Object

org.apache.hadoop.hive.metastore.parser.ExpressionTree

public class ExpressionTree
extends java.lang.Object

The Class representing the filter as a binary tree. The tree has TreeNode's at intermediate level and the leaf level nodes are of type LeafNode.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExpressionTree.ANTLRNoCaseStringStream Case insensitive ANTLR string stream
static class	ExpressionTree.LeafNode The Class representing the leaf level nodes in the ExpressionTree.
static class	ExpressionTree.LogicalOperator The logical operations supported.
static class	ExpressionTree.Operator The operators supported.
static class	ExpressionTree.TreeNode The Class representing a Node in the ExpressionTree.
static interface	ExpressionTree.TreeVisitor

Constructor Summary

Constructors

Constructor and Description
ExpressionTree()

Method Summary

Modifier and Type	Method and Description
void	addIntermediateNode(ExpressionTree.LogicalOperator andOr) Adds a intermediate node of either type(AND/OR).
void	addLeafNode(ExpressionTree.LeafNode newNode) Adds a leaf node, pushes the new node onto the stack.
java.lang.String	generateJDOFilter(Table table, java.util.Map<java.lang.String,java.lang.Object> params) Generate the JDOQL filter for the given expression tree
ExpressionTree.TreeNode	getRoot()

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionTree

public ExpressionTree()

Method Detail

getRoot

public ExpressionTree.TreeNode getRoot()

addIntermediateNode

public void addIntermediateNode(ExpressionTree.LogicalOperator andOr)

Adds a intermediate node of either type(AND/OR). Pops last two nodes from the stack and sets them as children of the new node and pushes itself onto the stack.

Parameters:

andOr - the operator type

addLeafNode

public void addLeafNode(ExpressionTree.LeafNode newNode)

Adds a leaf node, pushes the new node onto the stack.

Parameters:

newNode - the new node

generateJDOFilter

public java.lang.String generateJDOFilter(Table table,
                                          java.util.Map<java.lang.String,java.lang.Object> params)
                                   throws MetaException

Generate the JDOQL filter for the given expression tree

Parameters:

table - the table being queried

params - the input map which is updated with the the parameterized values. Keys are the parameter names and values are the parameter values

Returns:

the string representation of the expression tree

Throws:

MetaException