File	Doc	Category	Size	Date	Package
ExpressionIterator.java	API Doc	Glassfish v2 API	4112	Tue May 22 16:54:32 BST 2007	oracle.toplink.essentials.internal.expressions

ExpressionIterator

• java.lang.Object

Fields Summary
protected Object	result Allow the iteration to build a result.
protected SQLSelectStatement	statement Some iterations require a statement.
protected Object	parameter Some iterations require a more general parameter.

Constructors Summary
public ExpressionIterator() Block constructor comment. super();

Methods Summary
public java.lang.Object	getResult() return result;
public oracle.toplink.essentials.internal.expressions.SQLSelectStatement	getStatement() return statement;
public boolean	hasAlreadyVisited(oracle.toplink.essentials.expressions.Expression expression) Answers if this expression has already been visited. For a faster iteration override to insure expressions are only visited/processed once. return false;
public abstract void	iterate(oracle.toplink.essentials.expressions.Expression expression) INTERNAL: This method must be defined by subclasses to implement the logic of the iteratation.
public void	iterateOn(java.util.Vector expressions) INTERNAL: for (Enumeration expressionEnum = expressions.elements(); expressionEnum.hasMoreElements();) { iterate((Expression)expressionEnum.nextElement()); }
public void	iterateOn(oracle.toplink.essentials.expressions.Expression expression) INTERNAL: Return the call. expression.iterateOn(this);
public void	setResult(java.lang.Object result) this.result = result;
public void	setStatement(oracle.toplink.essentials.internal.expressions.SQLSelectStatement statement) this.statement = statement;
public boolean	shouldIterateOverSubSelects() Normally an Iterator will not go into the where clause of an SQLSubSelectExpression. I.e. when aliasing the parent statement is aliased before the subselects may even be normalized. An iterator to alias the SubSelect must be run later. return false;