org.hibernate.hql.ast.util
Class ASTUtil

java.lang.Object
  org.hibernate.hql.ast.util.ASTUtil

public final class ASTUtil
extends Object

Provides utility methods for AST traversal and manipulation.

Author:

Joshua Davis, Steve Ebersole

Nested Class Summary

static interface	ASTUtil.FilterPredicate Filters nodes out of a tree.
static class	ASTUtil.IncludePredicate A predicate that uses inclusion, rather than exclusion semantics.

Method Summary

static void	appendSibling(antlr.collections.AST n, antlr.collections.AST s)
static List	collectChildren(antlr.collections.AST root, ASTUtil.FilterPredicate predicate)
static antlr.collections.AST	create(antlr.ASTFactory astFactory, int type, String text) Deprecated. silly
static antlr.collections.AST	createBinarySubtree(antlr.ASTFactory factory, int parentType, String parentText, antlr.collections.AST child1, antlr.collections.AST child2) Creates a 'binary operator' subtree, given the information about the parent and the two child nodex.
static antlr.collections.AST	createParent(antlr.ASTFactory factory, int parentType, String parentText, antlr.collections.AST child) Creates a single parent of the specified child (i.e.
static antlr.collections.AST	createSibling(antlr.ASTFactory astFactory, int type, String text, antlr.collections.AST prevSibling) Creates a single node AST as a sibling of the passed prevSibling, taking care to reorganize the tree correctly to account for this newly created node.
static antlr.collections.AST	createTree(antlr.ASTFactory factory, antlr.collections.AST[] nestedChildren)
static antlr.collections.AST	findPreviousSibling(antlr.collections.AST parent, antlr.collections.AST child) Find the previous sibling in the parent for the given child.
static antlr.collections.AST	findTypeInChildren(antlr.collections.AST parent, int type) Finds the first node of the specified type in the chain of children.
static Map	generateTokenNameCache(Class tokenTypeInterface) Method to generate a map of token type names, keyed by their token type values.
static String	getConstantName(Class owner, int value) Deprecated. Use #getTokenTypeName instead
static String	getDebugString(antlr.collections.AST n) Returns the 'list' representation with some brackets around it for debugging.
static antlr.collections.AST	getLastChild(antlr.collections.AST n) Returns the last direct child of 'n'.
static String	getPathText(antlr.collections.AST n)
static String	getTokenTypeName(Class tokenTypeInterface, int tokenType) Intended to retrieve the name of an AST token type based on the token type interface.
static boolean	hasExactlyOneChild(antlr.collections.AST n)
static void	insertChild(antlr.collections.AST parent, antlr.collections.AST child) Inserts the child as the first child of the parent, all other children are shifted over to the 'right'.
static antlr.collections.AST	insertSibling(antlr.collections.AST node, antlr.collections.AST prevSibling) Inserts a node into a child subtree as a particularly positioned sibling taking care to properly reorganize the tree to account for this new addition.
static boolean	isSubtreeChild(antlr.collections.AST fixture, antlr.collections.AST test) Determine if a given node (test) is contained anywhere in the subtree of another given node (fixture).
static void	makeSiblingOfParent(antlr.collections.AST parent, antlr.collections.AST child) Makes the child node a sibling of the parent, reconnecting all siblings.

Methods inherited from class java.lang.Object

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

Method Detail

create

public static antlr.collections.AST create(antlr.ASTFactory astFactory,
                                           int type,
                                           String text)

Deprecated. silly

Creates a single node AST.

TODO : this is silly, remove it...

Parameters:

astFactory - The factory.

type - The node type.

text - The node text.

Returns:

AST - A single node tree.

createSibling

public static antlr.collections.AST createSibling(antlr.ASTFactory astFactory,
                                                  int type,
                                                  String text,
                                                  antlr.collections.AST prevSibling)

Creates a single node AST as a sibling of the passed prevSibling, taking care to reorganize the tree correctly to account for this newly created node.

Parameters:

astFactory - The factory.

type - The node type.

text - The node text.

prevSibling - The previous sibling.

Returns:

The created AST node.

insertSibling

public static antlr.collections.AST insertSibling(antlr.collections.AST node,
                                                  antlr.collections.AST prevSibling)

Inserts a node into a child subtree as a particularly positioned sibling taking care to properly reorganize the tree to account for this new addition.

Parameters:

node - The node to insert

prevSibling - The previous node at the sibling position where we want this node inserted.

Returns:

The return is the same as the node parameter passed in.

createBinarySubtree

public static antlr.collections.AST createBinarySubtree(antlr.ASTFactory factory,
                                                        int parentType,
                                                        String parentText,
                                                        antlr.collections.AST child1,
                                                        antlr.collections.AST child2)

Creates a 'binary operator' subtree, given the information about the parent and the two child nodex.

Parameters:

factory - The AST factory.

parentType - The type of the parent node.

parentText - The text of the parent node.

child1 - The first child.

child2 - The second child.

Returns:

AST - A new sub-tree of the form "(parent child1 child2)"

createParent

public static antlr.collections.AST createParent(antlr.ASTFactory factory,
                                                 int parentType,
                                                 String parentText,
                                                 antlr.collections.AST child)

Creates a single parent of the specified child (i.e. a 'unary operator' subtree).

Parameters:

factory - The AST factory.

parentType - The type of the parent node.

parentText - The text of the parent node.

child - The child.

Returns:

AST - A new sub-tree of the form "(parent child)"

createTree

public static antlr.collections.AST createTree(antlr.ASTFactory factory,
                                               antlr.collections.AST[] nestedChildren)

isSubtreeChild

public static boolean isSubtreeChild(antlr.collections.AST fixture,
                                     antlr.collections.AST test)

Determine if a given node (test) is contained anywhere in the subtree of another given node (fixture).

Parameters:

fixture - The node against which to testto be checked for children.

test - The node to be tested as being a subtree child of the parent.

Returns:

True if child is contained in the parent's collection of children.

findTypeInChildren

public static antlr.collections.AST findTypeInChildren(antlr.collections.AST parent,
                                                       int type)

Finds the first node of the specified type in the chain of children.

Parameters:

parent - The parent

type - The type to find.

Returns:

The first node of the specified type, or null if not found.

getLastChild

public static antlr.collections.AST getLastChild(antlr.collections.AST n)

Returns the last direct child of 'n'.

Parameters:

n - The parent

Returns:

The last direct child of 'n'.

getDebugString

public static String getDebugString(antlr.collections.AST n)

Returns the 'list' representation with some brackets around it for debugging.

Parameters:

n - The tree.

Returns:

The list representation of the tree.

findPreviousSibling

public static antlr.collections.AST findPreviousSibling(antlr.collections.AST parent,
                                                        antlr.collections.AST child)

Find the previous sibling in the parent for the given child.

Parameters:

parent - the parent node

child - the child to find the previous sibling of

Returns:

the previous sibling of the child

makeSiblingOfParent

public static void makeSiblingOfParent(antlr.collections.AST parent,
                                       antlr.collections.AST child)

Makes the child node a sibling of the parent, reconnecting all siblings.

Parameters:

parent - the parent

child - the child

getPathText

public static String getPathText(antlr.collections.AST n)

hasExactlyOneChild

public static boolean hasExactlyOneChild(antlr.collections.AST n)

appendSibling

public static void appendSibling(antlr.collections.AST n,
                                 antlr.collections.AST s)

insertChild

public static void insertChild(antlr.collections.AST parent,
                               antlr.collections.AST child)

Inserts the child as the first child of the parent, all other children are shifted over to the 'right'.

Parameters:

parent - the parent

child - the new first child

collectChildren

public static List collectChildren(antlr.collections.AST root,
                                   ASTUtil.FilterPredicate predicate)

generateTokenNameCache

public static Map generateTokenNameCache(Class tokenTypeInterface)

Method to generate a map of token type names, keyed by their token type values.

Parameters:

tokenTypeInterface - The *TokenTypes interface (or implementor of said interface).

Returns:

The generated map.

getConstantName

public static String getConstantName(Class owner,
                                     int value)

Deprecated. Use #getTokenTypeName instead

Get the name of a constant defined on the given class which has the given value.

Note, if multiple constants have this value, the first will be returned which is known to be different on different JVM implementations.

Parameters:

owner - The class which defines the constant

value - The value of the constant.

Returns:

The token type name, *or* the integer value if the name could not be found.

getTokenTypeName

public static String getTokenTypeName(Class tokenTypeInterface,
                                      int tokenType)

Intended to retrieve the name of an AST token type based on the token type interface. However, this method can be used to look up the name of any constant defined on a class/interface based on the constant value. Note that if multiple constants have this value, the first will be returned which is known to be different on different JVM implementations.

Parameters:

tokenTypeInterface - The *TokenTypes interface (or one of its implementors).

tokenType - The token type value.

Returns:

The corresponding name.