com.metamatrix.query.optimizer.xml
Class ReferenceBindingReplacerVisitor

java.lang.Object
  com.metamatrix.query.sql.LanguageVisitor
      com.metamatrix.query.sql.visitor.ExpressionMappingVisitor
          com.metamatrix.query.optimizer.xml.ReferenceBindingReplacerVisitor

public class ReferenceBindingReplacerVisitor
extends ExpressionMappingVisitor

This visitor class will traverse a language object tree, find any Reference objects, and replace them with the corresponding parsed Expression which is the Reference's binding. The List of parsed bindings must contain Expressions, and of course the number and order of the bindings must match up with the number and order of the References that are in the Language Object.

The easiest way to use this visitor is to call the static methods which create the visitor and run it. The public visit() methods should NOT be called directly.

Constructor Summary

ReferenceBindingReplacerVisitor(java.util.List parsedBindingExpressions)
Construct a new visitor with the default collection type, which is a HashSet.

Method Summary

Expression	replaceExpression(Expression element)
static void	replaceReferences(LanguageObject obj, java.util.List parsedBindingExpressions) Helper to quickly get the references from obj in the references collection

Methods inherited from class com.metamatrix.query.sql.visitor.ExpressionMappingVisitor

createAliases, getVariableValues, mapExpressions, mapExpressions, setVariableValues, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class com.metamatrix.query.sql.LanguageVisitor

setAbort, shouldAbort, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

ReferenceBindingReplacerVisitor

public ReferenceBindingReplacerVisitor(java.util.List parsedBindingExpressions)

Construct a new visitor with the default collection type, which is a HashSet.

Method Detail

replaceExpression

public Expression replaceExpression(Expression element)

Overrides:

replaceExpression in class ExpressionMappingVisitor

replaceReferences

public static final void replaceReferences(LanguageObject obj,
                                           java.util.List parsedBindingExpressions)

Helper to quickly get the references from obj in the references collection

Parameters:

obj - Language object

elements - Collection to collect references in