java.lang.Object
- org.apache.jackrabbit.spi.commons.query.QueryNode

Direct Known Subclasses:

ExactQueryNode, NAryQueryNode, OrderQueryNode, PropertyFunctionQueryNode, QueryRootNode, TextsearchQueryNode
```
public abstract class QueryNode
extends java.lang.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 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_PROP_FUNCTION`	Type value for `PropertyFunctionQueryNode`
`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

Constructors
Constructor Description

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

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract java.lang.Object`	`accept(QueryNodeVisitor visitor, java.lang.Object data)`	Accepts a `QueryNodeVisitor` and calls the appropriate `visit` method on the visitor depending on the concrete implementation of this `QueryNode`.
`java.lang.String`	`dump()`	Dumps this QueryNode and its child nodes to a String.
`abstract boolean`	`equals(java.lang.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 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
  - TYPE_PROP_FUNCTION
```
public static final int TYPE_PROP_FUNCTION
```
    Type value for PropertyFunctionQueryNode
    
    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 java.lang.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 java.lang.Object accept(QueryNodeVisitor visitor,
                                        java.lang.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(java.lang.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 java.lang.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.

Class QueryNode

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

TYPE_ROOT

TYPE_RELATION

TYPE_ORDER

TYPE_TEXTSEARCH

TYPE_EXACT

TYPE_NODETYPE

TYPE_AND

TYPE_OR

TYPE_NOT

TYPE_LOCATION

TYPE_PATH

TYPE_DEREF

TYPE_PROP_FUNCTION

Constructor Detail

QueryNode

Method Detail

getParent

dump

accept

getType

equals

needsSystemTree