org.modeshape.jcr.xpath
Class XPathToQueryTranslator

java.lang.Object
  org.modeshape.jcr.xpath.XPathToQueryTranslator

public class XPathToQueryTranslator
extends Object

A component that translates an XPath abstract syntax model representation into a ModeShape abstract query model.

Nested Class Summary

protected static class	XPathToQueryTranslator.DepthMode
protected static class	XPathToQueryTranslator.DualPathLikeBuilder
protected static interface	XPathToQueryTranslator.PathLikeBuilder
protected static class	XPathToQueryTranslator.RelativePathLikeExpressions
protected static class	XPathToQueryTranslator.SinglePathLikeBuilder

Field Summary

protected static Map<XPath.NameTest,String>

CAST_FUNCTION_NAME_TO_TYPE

Constructor Summary

XPathToQueryTranslator(TypeSystem context, String query)

Method Summary

protected boolean	appliesToPathConstraint(List<XPath.Component> predicates) Determine if the predicates contain any expressions that cannot be put into a LIKE constraint on the path.
QueryCommand	createQuery(XPath.Component xpath)
protected List<XPath.AttributeNameTest>	extractAttributeNames(XPath.BinaryComponent binary) Find any attribute names that have been unioned together (with '|').
protected List<XPath.NameTest>	extractElementNames(XPath.BinaryComponent binary) Find any element names that have been unioned together (with '|').
protected String	nameFrom(XPath.NameTest name)
protected String	newAlias()
protected XPathToQueryTranslator.RelativePathLikeExpressions	relativePathLikeExpressions(XPath.PathExpression pathExpression)
protected void	translate(XPath.PathExpression pathExpression)
protected String	translateElementTest(XPath.ElementTest elementTest, List<XPath.StepExpression> pathConstraint, QueryBuilder.ConstraintBuilder where)
protected boolean	translatePathExpressionConstraint(XPath.PathExpression pathExrp, QueryBuilder.ConstraintBuilder where, String tableName)
protected String	translatePredicate(XPath.Component predicate, String tableName, QueryBuilder.ConstraintBuilder where)
protected void	translatePredicates(List<XPath.Component> predicates, String tableName, QueryBuilder.ConstraintBuilder where)
protected String	translateSource(String tableName, List<XPath.StepExpression> path, QueryBuilder.ConstraintBuilder where)

Methods inherited from class java.lang.Object

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

Field Detail

CAST_FUNCTION_NAME_TO_TYPE

protected static final Map<XPath.NameTest,String> CAST_FUNCTION_NAME_TO_TYPE

Constructor Detail

XPathToQueryTranslator

public XPathToQueryTranslator(TypeSystem context,
                              String query)

Method Detail

createQuery

public QueryCommand createQuery(XPath.Component xpath)

translate

protected void translate(XPath.PathExpression pathExpression)

extractAttributeNames

protected List<XPath.AttributeNameTest> extractAttributeNames(XPath.BinaryComponent binary)

Find any attribute names that have been unioned together (with '|'). Any other combination of objects results in an error.

Parameters:

binary - the binary component

Returns:

the list of attribute names, if that's all that's in the supplied component; may be empty

extractElementNames

protected List<XPath.NameTest> extractElementNames(XPath.BinaryComponent binary)

Find any element names that have been unioned together (with '|'). Any other combination of objects results in an error.

Parameters:

binary - the binary component

Returns:

the list of attribute names, if that's all that's in the supplied component; may be empty

translateSource

protected String translateSource(String tableName,
                                 List<XPath.StepExpression> path,
                                 QueryBuilder.ConstraintBuilder where)

translateElementTest

protected String translateElementTest(XPath.ElementTest elementTest,
                                      List<XPath.StepExpression> pathConstraint,
                                      QueryBuilder.ConstraintBuilder where)

translatePredicates

protected void translatePredicates(List<XPath.Component> predicates,
                                   String tableName,
                                   QueryBuilder.ConstraintBuilder where)

translatePredicate

protected String translatePredicate(XPath.Component predicate,
                                    String tableName,
                                    QueryBuilder.ConstraintBuilder where)

appliesToPathConstraint

protected boolean appliesToPathConstraint(List<XPath.Component> predicates)

Determine if the predicates contain any expressions that cannot be put into a LIKE constraint on the path.

Parameters:

predicates - the predicates

Returns:

true if the supplied predicates can be handled entirely in the LIKE constraint on the path, or false if they have to be handled as other criteria

translatePathExpressionConstraint

protected boolean translatePathExpressionConstraint(XPath.PathExpression pathExrp,
                                                    QueryBuilder.ConstraintBuilder where,
                                                    String tableName)

relativePathLikeExpressions

protected XPathToQueryTranslator.RelativePathLikeExpressions relativePathLikeExpressions(XPath.PathExpression pathExpression)

nameFrom

protected String nameFrom(XPath.NameTest name)

newAlias

protected String newAlias()