it.unimi.di.mg4j.query.nodes
Class AbstractTermExpander.ExpanderVisitor

java.lang.Object
  it.unimi.di.mg4j.query.nodes.AbstractQueryBuilderVisitor<Query>
      it.unimi.di.mg4j.query.nodes.AbstractTermExpander.ExpanderVisitor

All Implemented Interfaces:

QueryBuilderVisitor<Query>, FlyweightPrototype<QueryBuilderVisitor<Query>>

Direct Known Subclasses:

MultiIndexTermExpander.ExpanderVisitor

Enclosing class:

AbstractTermExpander

protected class AbstractTermExpander.ExpanderVisitor
extends AbstractQueryBuilderVisitor<Query>

Constructor Summary

protected

AbstractTermExpander.ExpanderVisitor()

Method Summary

AbstractTermExpander.ExpanderVisitor	copy()
Query[]	newArray(int len) Builds an array of given length of type T.
QueryBuilderVisitor<Query>	prepare() No-op.
Query	visit(False node) Visits False.
Query	visit(Prefix node) Visits a Prefix.
Query	visit(Range node) Visits a Range.
Query	visit(Term node) Visits a Term.
Query	visit(True node) Visits True.
Query	visitPost(Align node, Query[] subNode) Visits an Align node after recursing into the corresponding subtree.
Query	visitPost(And node, Query[] subNode) Visits an And node after recursing into the corresponding subtree.
Query	visitPost(Consecutive node, Query[] subNode) Visits a Consecutive node after recursing into the corresponding subtree.
Query	visitPost(Difference node, Query[] subNode) Visits an Difference node after recursing into the corresponding subtree.
Query	visitPost(LowPass node, Query subNode) Visits a LowPass node after recursing into the corresponding subtree.
Query	visitPost(MultiTerm node, Query[] subNode) Visits a MultiTerm node after recursing into the corresponding subtree.
Query	visitPost(Not node, Query subNode) Visits a Not node after recursing into the corresponding subtree.
Query	visitPost(OrderedAnd node, Query[] subNode) Visits an OrderedAnd node after recursing into the corresponding subtree.
Query	visitPost(Or node, Query[] subNode) Visits an Or node after recursing into the corresponding subtree.
Query	visitPost(Remap node, Query subNode) Visits a Remap node after recursing into the corresponding subtree.
Query	visitPost(Select node, Query subNode) Visits a Select node after recursing into the corresponding subtree.
Query	visitPost(Weight node, Query subNode) Visits a Weight node after recursing into the corresponding subtree.

Methods inherited from class it.unimi.di.mg4j.query.nodes.AbstractQueryBuilderVisitor

visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre, visitPre

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractTermExpander.ExpanderVisitor

protected AbstractTermExpander.ExpanderVisitor()

Method Detail

copy

public AbstractTermExpander.ExpanderVisitor copy()

newArray

public Query[] newArray(int len)

Description copied from interface: QueryBuilderVisitor

Builds an array of given length of type T.

Because of erasure, generic classes in Java cannot allocate arrays of generic types. This impossibility can be a problem if for some reason the visitPost() methods expect an actual array of type T. This method must provide an array of given length that is an acceptable input for all visitPost() methods.

Note that by declaring an implementing class of this interface that has a sole constructor accepting an argument of type Class<T>, you will force the user to provide the class of the generic type, opening the way for the reflective methods in Array.

Parameters:

len - the required array length.

Returns:

an array of type T of length len.

prepare

public QueryBuilderVisitor<Query> prepare()

Description copied from class: AbstractQueryBuilderVisitor

No-op.

Specified by:

prepare in interface QueryBuilderVisitor<Query>

Overrides:

prepare in class AbstractQueryBuilderVisitor<Query>

Returns:

this visitor.

visit

public Query visit(Term node)
            throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Term.

Parameters:

node - the leaf to be visited.

Returns:

true if the visit should continue.

Throws:

QueryBuilderVisitorException

visit

public Query visit(Prefix node)
            throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Prefix.

Parameters:

node - the leaf to be visited.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visit

public Query visit(Range node)
            throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Range.

Parameters:

node - the leaf to be visited.

Returns:

true if the visit should continue.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(And node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits an And node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the array of results returned by subnodes.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Consecutive node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Consecutive node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the array of results returned by subnodes.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(OrderedAnd node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits an OrderedAnd node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the array of results returned by subnodes.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Difference node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits an Difference node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the array of results returned by subnodes.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(LowPass node,
                       Query subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a LowPass node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Not node,
                       Query subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Not node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Or node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits an Or node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Align node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits an Align node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the array of results returned by subnodes.

Returns:

an appropriate return value (usually, the object built using the elements in subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(MultiTerm node,
                       Query[] subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a MultiTerm node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Select node,
                       Query subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Select node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Remap node,
                       Query subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Remap node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visitPost

public Query visitPost(Weight node,
                       Query subNode)
                throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits a Weight node after recursing into the corresponding subtree.

Parameters:

node - the internal node to be visited.

subNode - the of result returned by the sole subnode.

Returns:

an appropriate return value (usually, the object built using subNodeResult) if the visit should continue, or null.

Throws:

QueryBuilderVisitorException

visit

public Query visit(True node)
            throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits True.

Parameters:

node - the leaf to be visited.

Returns:

true if the visit should continue.

Throws:

QueryBuilderVisitorException

visit

public Query visit(False node)
            throws QueryBuilderVisitorException

Description copied from interface: QueryBuilderVisitor

Visits False.

Parameters:

node - the leaf to be visited.

Returns:

true if the visit should continue.

Throws:

QueryBuilderVisitorException