Package eu.clarin.sru.fcs.qlparser

Class AbstractQueryNode<Q extends AbstractQueryNode<Q,T,V>,T extends AbstractQueryNode.AbstractQueryNodeType,V extends AbstractQueryNode.AbstractQueryVisitor>

java.lang.Object

eu.clarin.sru.fcs.qlparser.AbstractQueryNode<Q,T,V>

Direct Known Subclasses:

QueryNode, QueryNode

public abstract class AbstractQueryNode<Q extends AbstractQueryNode<Q,T,V>,T extends AbstractQueryNode.AbstractQueryNodeType,V extends AbstractQueryNode.AbstractQueryVisitor>
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	AbstractQueryNode.AbstractQueryNodeType	Interface for node types of query expression tree nodes.
static interface	AbstractQueryNode.AbstractQueryVisitor	Interface implementing a Visitor pattern for query expression trees.
static class	AbstractQueryNode.SourceLocation	Source information wrapping start and stop offsets in the query text for a query node.

Field Summary

Fields

Modifier and Type	Field	Description
protected List<Q>	children
protected AbstractQueryNode.SourceLocation	location
protected T	nodeType
protected Q	parent

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractQueryNode(T nodeType)	Constructor.
protected	AbstractQueryNode(T nodeType, List<Q> children)	Constructor.
protected	AbstractQueryNode(T nodeType, Q child)	Constructor.

Method Summary

Modifier and Type	Method	Description
abstract void	accept(V visitor)
Q	getChild(int idx)	Get a child node by index.
<X extends Q> X	getChild(Class<X> clazz, int idx)	Get a child node of specified type by index.
int	getChildCount()	Get the number of children of this node.
List<Q>	getChildren()	The children of this node.
Q	getFirstChild()	Get this first child node.
<X extends Q> X	getFirstChild(Class<X> clazz)	Get a first child node of specified type.
Q	getLastChild()	Get this last child node.
AbstractQueryNode.SourceLocation	getLocation()	Get source location information about start/stop offsets for this query node in the query text content.
T	getNodeType()	Get the node type of this node.
Q	getParent()	Get the parent node of this node.
boolean	hasNodeType(T nodeType)	Check, if node if of given type.
void	setLocation(AbstractQueryNode.SourceLocation location)	Set source location information.
protected void	setParent(Q parent)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

nodeType

protected final T extends AbstractQueryNode.AbstractQueryNodeType nodeType

children

protected final List<Q extends AbstractQueryNode<Q,T,V>> children

parent

protected Q extends AbstractQueryNode<Q,T,V> parent

location

protected AbstractQueryNode.SourceLocation location

Constructor Detail

AbstractQueryNode

protected AbstractQueryNode(T nodeType,
                            List<Q> children)

Constructor.

Parameters:

nodeType - the type of the node

children - the children of this node or null if none

AbstractQueryNode

protected AbstractQueryNode(T nodeType,
                            Q child)

Constructor.

Parameters:

nodeType - the type of the node

child - the child of this node or null if none

AbstractQueryNode

protected AbstractQueryNode(T nodeType)

Constructor.

Parameters:

nodeType - the type of the node

Method Detail

getNodeType

public T getNodeType()

Get the node type of this node.

Returns:

the node type

hasNodeType

public boolean hasNodeType(T nodeType)

Check, if node if of given type.

Parameters:

nodeType - type to check against

Returns:

true if node is of given type, false otherwise

getParent

public Q getParent()

Get the parent node of this node.

Returns:

the parent node or null if this is the root node

setParent

protected final void setParent(Q parent)

getChildren

public List<Q> getChildren()

The children of this node.

Returns:

the list of children of this node

getChildCount

public int getChildCount()

Get the number of children of this node.

Returns:

the number of children of this node

getChild

public Q getChild(int idx)

Get a child node by index.

Parameters:

idx - the index of the child node

Returns:

the child node of this node or null if index is out of bounds

getFirstChild

public Q getFirstChild()

Get this first child node.

Returns:

the first child node of this node or null if none

getLastChild

public Q getLastChild()

Get this last child node.

Returns:

the last child node of this node or null if none

getChild

public <X extends Q> X getChild(Class<X> clazz,
                                int idx)

Get a child node of specified type by index. Only child nodes of the requested type are counted.

Type Parameters:

X - the class of the nodes to be considered

Parameters:

clazz - the type to nodes to be considered

idx - the index of the child node

Returns:

the child node of this node or null if no child was found

getFirstChild

public <X extends Q> X getFirstChild(Class<X> clazz)

Get a first child node of specified type.

Type Parameters:

X - the class of the nodes to be considered

Parameters:

clazz - the type to nodes to be considered

Returns:

the child node of this node or null if no child was found

getLocation

public AbstractQueryNode.SourceLocation getLocation()

Get source location information about start/stop offsets for this query node in the query text content.

Returns:

the location information with the span convering the query node in the query

setLocation

public final void setLocation(AbstractQueryNode.SourceLocation location)

Set source location information.

Parameters:

location - the location information with the span convering the query node in the query

accept

public abstract void accept(V visitor)

toString

public String toString()

Overrides:

toString in class Object