Package org.apache.jackrabbit.spi.commons.query

Class QueryNode

java.lang.Object

org.apache.jackrabbit.spi.commons.query.QueryNode

Direct Known Subclasses:

ExactQueryNode, NAryQueryNode, OrderQueryNode, PropertyFunctionQueryNode, QueryRootNode, 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

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
abstract Object	accept(QueryNodeVisitor visitor, Object data)	Accepts a QueryNodeVisitor and calls the appropriate 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.
abstract boolean	needsSystemTree()	Returns true if this query node needs items under /jcr:system to be queried.

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

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

TYPE_PROP_FUNCTION

public static final int TYPE_PROP_FUNCTION

Type value for PropertyFunctionQueryNode

See Also:

• Constant Field Values

Constructor Details

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 Details

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()
            throws RepositoryException

Dumps this QueryNode and its child nodes to a String.

Returns:

the query tree as a String.

Throws:

RepositoryException

accept

public abstract Object accept(QueryNodeVisitor visitor,
 Object data)
                       throws RepositoryException

Accepts a QueryNodeVisitor and calls the appropriate 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.

Throws:

RepositoryException

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.

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if obj is equal to this; false otherwise.

needsSystemTree

public abstract boolean needsSystemTree()

Returns true if this query node needs items under /jcr:system to be queried.

Returns:

true if this query node needs content under /jcr:system to be queried; false otherwise.