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org.eclipse.persistence.internal.expressions

public abstract Class ExpressionIterator

Class Inheritance

extends Object

java.lang.Object
org.eclipse.persistence.internal.expressions.ExpressionIterator

Imports

java.util.*, org.eclipse.persistence.expressions.*

Used to itterate an expression tree, through inner subclasses.

Field Summary

Modifier and Type	Field and Description
protected Object	parameter Some iterations require a more general parameter.
protected Object	result Allow the iteration to build a result.
protected SQLSelectStatement	statement Some iterations require a statement.

Constructor Summary

Access	Constructor and Description
protected	ExpressionIterator() Block constructor comment.

Method Summary

Modifier and Type	Method and Description
public Object	getResult()
public SQLSelectStatement	getStatement()
public boolean	hasAlreadyVisited(Expression expression) Answers if this expression has already been visited.
public abstract void	iterate(Expression expression) INTERNAL: This method must be defined by subclasses to implement the logic of the iteratation.
public void	iterateOn(Vector<E> expressions) INTERNAL:
public void	iterateOn(Expression expression) INTERNAL: Return the call.
public void	setResult(Object result)
public void	setStatement(SQLSelectStatement statement)
public boolean	shouldIterateOverSubSelects() Normally an Iterator will not go into the where clause of an SQLSubSelectExpression.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

parameter	back to summary
protected Object parameter Some iterations require a more general parameter.

result	back to summary
protected Object result Allow the iteration to build a result.

statement	back to summary
protected SQLSelectStatement statement Some iterations require a statement.

Constructor Detail

ExpressionIterator	back to summary
protected ExpressionIterator() Block constructor comment.

Method Detail

getResult	back to summary
public Object getResult()

getStatement	back to summary
public SQLSelectStatement getStatement()

hasAlreadyVisited	back to summary
public boolean hasAlreadyVisited(Expression expression) Answers if this expression has already been visited. For a faster iteration override to insure expressions are only visited/processed once.

iterate	back to summary
public abstract void iterate(Expression expression) INTERNAL: This method must be defined by subclasses to implement the logic of the iteratation.

iterateOn	back to summary
public void iterateOn(Vector<E> expressions) INTERNAL:

iterateOn	back to summary
public void iterateOn(Expression expression) INTERNAL: Return the call.

setResult	back to summary
public void setResult(Object result)

setStatement	back to summary
public void setStatement(SQLSelectStatement statement)

shouldIterateOverSubSelects	back to summary
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.