org.apache.jackrabbit.core.query
Class QueryNode

java.lang.Object
  org.apache.jackrabbit.core.query.QueryNode

Direct Known Subclasses:

ExactQueryNode, NAryQueryNode, OrderQueryNode, QueryRootNode, RelationQueryNode, TextsearchQueryNode

public abstract class QueryNode

extends Object

Implements an abstract base class for nodes of a query tree that represents a query. The query tree is independent from the query syntax which is used to search the repository.

Field Summary

static int	TYPE_AND Type value for AndQueryNode
static int	TYPE_DEREF Type value for DerefQueryNode
static int	TYPE_EXACT Type value for ExactQueryNode
static int	TYPE_LOCATION Type value for LocationStepQueryNode
static int	TYPE_NODETYPE Type value for NodeTypeQueryNode
static int	TYPE_NOT Type value for NotQueryNode
static int	TYPE_OR Type value for OrQueryNode
static int	TYPE_ORDER Type value for OrderQueryNode
static int	TYPE_PATH Type value for PathQueryNode
static int	TYPE_RELATION Type value for RelationQueryNode
static int	TYPE_ROOT Type value for QueryRootNode
static int	TYPE_TEXTSEARCH Type value for TextsearchQueryNode

Constructor Summary

QueryNode(QueryNode parent)
Constructs a new QueryNode with a reference to it's parent.

Method Summary

abstract Object	accept(QueryNodeVisitor visitor, Object data) Accepts a QueryNodeVisitor and calls the apropriate visit method on the visitor depending on the concrete implementation of this QueryNode.
String	dump() Dumps this QueryNode and its child nodes to a String.
abstract boolean	equals(Object obj) Returns true if obj is the same type of QueryNode as this node and is equal to this node.
QueryNode	getParent() Returns the parent QueryNode or null if this is the root node of a query tree.
abstract int	getType() Returns the type of this query node.

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_ROOT

public static final int TYPE_ROOT

Type value for QueryRootNode

See Also:

Constant Field Values

TYPE_RELATION

public static final int TYPE_RELATION

Type value for RelationQueryNode

See Also:

Constant Field Values

TYPE_ORDER

public static final int TYPE_ORDER

Type value for OrderQueryNode

See Also:

Constant Field Values

TYPE_TEXTSEARCH

public static final int TYPE_TEXTSEARCH

Type value for TextsearchQueryNode

See Also:

Constant Field Values

TYPE_EXACT

public static final int TYPE_EXACT

Type value for ExactQueryNode

See Also:

Constant Field Values

TYPE_NODETYPE

public static final int TYPE_NODETYPE

Type value for NodeTypeQueryNode

See Also:

Constant Field Values

TYPE_AND

public static final int TYPE_AND

Type value for AndQueryNode

See Also:

Constant Field Values

TYPE_OR

public static final int TYPE_OR

Type value for OrQueryNode

See Also:

Constant Field Values

TYPE_NOT

public static final int TYPE_NOT

Type value for NotQueryNode

See Also:

Constant Field Values

TYPE_LOCATION

public static final int TYPE_LOCATION

Type value for LocationStepQueryNode

See Also:

Constant Field Values

TYPE_PATH

public static final int TYPE_PATH

Type value for PathQueryNode

See Also:

Constant Field Values

TYPE_DEREF

public static final int TYPE_DEREF

Type value for DerefQueryNode

See Also:

Constant Field Values

Constructor Detail

QueryNode

public QueryNode(QueryNode parent)

Constructs a new QueryNode with a reference to it's parent.

Parameters:

parent - the parent node, or null if this is the root node of a query tree.

Method Detail

getParent

public QueryNode getParent()

Returns the parent QueryNode or null if this is the root node of a query tree.

Returns:

the parent QueryNode or null if this is the root node of a query tree.

dump

public String dump()

Dumps this QueryNode and its child nodes to a String.

Returns:

the query tree as a String.

accept

public abstract Object accept(QueryNodeVisitor visitor,
                              Object data)

Accepts a QueryNodeVisitor and calls the apropriate visit method on the visitor depending on the concrete implementation of this QueryNode.

Parameters:

visitor - the visitor to call back.

data - arbitrary data for the visitor.

Returns:

the return value of the visitor.visit() call.

getType

public abstract int getType()

Returns the type of this query node.

Returns:

the type of this query node.

equals

public abstract boolean equals(Object obj)

Returns true if obj is the same type of QueryNode as this node and is equal to this node.

Parameters:

obj - the reference object with which to compare.

Returns:

true if obj is equal to this; false otherwise.