com.redhat.lightblue.query

Class QueryIterator

java.lang.Object

com.redhat.lightblue.query.QueryIteratorSkeleton<QueryExpression>

com.redhat.lightblue.query.QueryIterator

Direct Known Subclasses:

RelativeRewriteIterator

public abstract class QueryIterator
extends QueryIteratorSkeleton<QueryExpression>

Traverses the query nodes in a recursive descend manner, optionally replacing query nodes as it goes through them. If a query node is replaced, all its ancestors are also replaced. The implementations of this iterator are expected to override the base functionality defined in the method bodies. For value comparison, field comparison, regex match, n-nary relational, and array contains expressions the default behavior is to simply return the original query. For unary, n-ary logical operations, and array match the default behavior recursively descends into the child nodes and creates new instances of the query clauses if child nodes are different than the originals.

Constructor Summary

Constructors

Constructor and Description
QueryIterator()

Method Summary

Methods

Modifier and Type	Method and Description
protected QueryExpression	itrAllMatchExpression(AllMatchExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrArrayContainsExpression(ArrayContainsExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrArrayMatchExpression(ArrayMatchExpression q, Path context) Default behavior is to recursively iterate the nested query.
protected QueryExpression	itrFieldComparisonExpression(FieldComparisonExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrNaryFieldRelationalExpression(NaryFieldRelationalExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrNaryLogicalExpression(NaryLogicalExpression q, Path context) Default behavior is to recursively iterate the nested quereies.
protected QueryExpression	itrNaryValueRelationalExpression(NaryValueRelationalExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrRegexMatchExpression(RegexMatchExpression q, Path context) Default behavior is to return q.
protected QueryExpression	itrUnaryLogicalExpression(UnaryLogicalExpression q, Path context) Default behavior is to recursively iterate the nested query.
protected QueryExpression	itrValueComparisonExpression(ValueComparisonExpression q, Path context) Default behavior is to return q.

Methods inherited from class com.redhat.lightblue.query.QueryIteratorSkeleton

iterate, iterate

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryIterator

public QueryIterator()

Method Detail

itrAllMatchExpression

protected QueryExpression itrAllMatchExpression(AllMatchExpression q,
                                    Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrAllMatchExpression in class QueryIteratorSkeleton<QueryExpression>

itrValueComparisonExpression

protected QueryExpression itrValueComparisonExpression(ValueComparisonExpression q,
                                           Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrValueComparisonExpression in class QueryIteratorSkeleton<QueryExpression>

itrFieldComparisonExpression

protected QueryExpression itrFieldComparisonExpression(FieldComparisonExpression q,
                                           Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrFieldComparisonExpression in class QueryIteratorSkeleton<QueryExpression>

itrRegexMatchExpression

protected QueryExpression itrRegexMatchExpression(RegexMatchExpression q,
                                      Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrRegexMatchExpression in class QueryIteratorSkeleton<QueryExpression>

itrNaryValueRelationalExpression

protected QueryExpression itrNaryValueRelationalExpression(NaryValueRelationalExpression q,
                                               Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrNaryValueRelationalExpression in class QueryIteratorSkeleton<QueryExpression>

itrNaryFieldRelationalExpression

protected QueryExpression itrNaryFieldRelationalExpression(NaryFieldRelationalExpression q,
                                               Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrNaryFieldRelationalExpression in class QueryIteratorSkeleton<QueryExpression>

itrArrayContainsExpression

protected QueryExpression itrArrayContainsExpression(ArrayContainsExpression q,
                                         Path context)

Default behavior is to return q. Override the method if more processing is needed. Return a new QueryExpression object if this clause is to be modified.

Specified by:

itrArrayContainsExpression in class QueryIteratorSkeleton<QueryExpression>

itrUnaryLogicalExpression

protected QueryExpression itrUnaryLogicalExpression(UnaryLogicalExpression q,
                                        Path context)

Default behavior is to recursively iterate the nested query. If nested processing returns an object different from the original nested query, this method creates a new unary logical expression using the new query expression, and returns that.

Specified by:

itrUnaryLogicalExpression in class QueryIteratorSkeleton<QueryExpression>

itrNaryLogicalExpression

protected QueryExpression itrNaryLogicalExpression(NaryLogicalExpression q,
                                       Path context)

Default behavior is to recursively iterate the nested quereies. If nested processing returns objects different from the original nested queries, this method creates a new n-ary logical expression using the new query expressions and returns that.

Specified by:

itrNaryLogicalExpression in class QueryIteratorSkeleton<QueryExpression>

itrArrayMatchExpression

protected QueryExpression itrArrayMatchExpression(ArrayMatchExpression q,
                                      Path context)

Default behavior is to recursively iterate the nested query. If nested processing returns an object different from the original nested query, this method creates a new array match expression using the new query expression, and returns that.

Specified by:

itrArrayMatchExpression in class QueryIteratorSkeleton<QueryExpression>