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com.jcorporate.expresso.kernel.util
Class DataContextIterator  

java.lang.Object
  com.jcorporate.expresso.kernel.util.DataContextIterator

All Implemented Interfaces:

java.util.Iterator

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public class DataContextIterator

extends java.lang.Object

implements java.util.Iterator

This class is useful for iterating through all data contexts that are installed at the root level of the Expresso Runtime hierarchy. Use it like a normal iterator except that it is explictly constructed.

Example Usage:
  for (DataContextIterator it = new DataContextIterator(); it.hasNext();) {
     DataContext oneContext = (DataContext)it.next();
     System.out.println("Context Name: " + oneContext.getMetaData().getName());
  }


Since:

Expresso 5.1

Version:

$Revision: 1.6 $ on $Date: 2004/11/17 20:48:17 $

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Field Summary
(package private)  java.util.Iterator	currentChild
(package private)  com.jcorporate.expresso.kernel.DataContext	next
(package private)  com.jcorporate.expresso.kernel.RootContainerInterface	runtime

 

Constructor Summary

DataContextIterator()           Default constructor.

DataContextIterator(com.jcorporate.expresso.kernel.RootContainerInterface iteratingRuntime)           Constructor that uses the RootContainerInterface given to it.

DataContextIterator(java.lang.String runtimeName)           Constructor that finds a runtime by name.

 

Method Summary
private  void	findNext()           Find and load the next values
boolean	hasNext()           Checks if another object exists.
java.lang.Object	next()           Retrieve the Next Data Context in the sequence.
com.jcorporate.expresso.kernel.DataContext	nextContext()           Retrieve the Next Data Context in the sequence.
void	remove()           Not implemented.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

runtime

com.jcorporate.expresso.kernel.RootContainerInterface runtime

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currentChild

java.util.Iterator currentChild

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next

com.jcorporate.expresso.kernel.DataContext next

Constructor Detail

DataContextIterator

public DataContextIterator()

Default constructor. Searches for and gets the default runtime map.

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DataContextIterator

public DataContextIterator(java.lang.String runtimeName)

Constructor that finds a runtime by name.

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DataContextIterator

public DataContextIterator(com.jcorporate.expresso.kernel.RootContainerInterface iteratingRuntime)

Constructor that uses the RootContainerInterface given to it.

Method Detail

hasNext

public boolean hasNext()

Checks if another object exists.

Specified by:

hasNext in interface java.util.Iterator

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next

public java.lang.Object next()

Retrieve the Next Data Context in the sequence.

Specified by:

next in interface java.util.Iterator

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nextContext

public com.jcorporate.expresso.kernel.DataContext nextContext()

Retrieve the Next Data Context in the sequence. The only difference between this and next() is that this function doesn't require a downcast.

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remove

public void remove()

Not implemented. Way too dangerous of a capability

Specified by:

remove in interface java.util.Iterator

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findNext

private void findNext()

Find and load the next values

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