Class TreeIteration

java.lang.Object

de.xima.fc.common.tree.TreeIteration

public final class TreeIteration
extends Object

An iterable that iterates over a tree-like graph in pre-order, starting at a given node. Throws an exception in case the graph is not a tree, thus also preventing endless cycles when the graph is cyclic.

Assume the following tree:

• a
  • a1
  • a2
    • a21
    • a22
• b
  • b1
  • b2

Then a pre-order traversal traverses the nodes in the following order:

• a
• a1
• a2
• a21
• a22
• b
• b1
• b2

Since:

8.4.0

Author:

XIMA MEDIA GmbH

Method Summary

Modifier and Type	Method	Description
static <TItem, TIdentifier> Iterable<TItem>	preOrderIterable(Iterable<? extends TItem> startItems, ITreeAccessor<TItem, TIdentifier> treeAccessor)	Creates an iterable over the tree's nodes in pre-order, starting at the given items.
static <TItem, TIdentifier> Iterable<TItem>	preOrderIterable(Iterable<? extends TItem> startItems, ITreeAccessor<TItem, TIdentifier> treeAccessor, long flags)	Creates an iterable over the tree's nodes in pre-order, starting at the given items.
static <TItem, TIdentifier> Iterable<TItem>	preOrderIterable(TItem startNode, ITreeAccessor<TItem, TIdentifier> treeAccessor)	Creates an iterable over the tree's nodes in pre-order, starting at the given item.
static <TItem, TIdentifier> Iterable<TItem>	preOrderIterable(TItem startNode, ITreeAccessor<TItem, TIdentifier> treeAccessor, long flags)	Creates an iterable over the tree's nodes in pre-order, starting at the given item.

Methods inherited from class Object

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

Method Details

preOrderIterable

public static <TItem, TIdentifier> Iterable<TItem> preOrderIterable(TItem startNode,
 ITreeAccessor<TItem, TIdentifier> treeAccessor)

Creates an iterable over the tree's nodes in pre-order, starting at the given item.

Type Parameters:

TItem - Type of the items in the tree.

TIdentifier - Type of the identifier that identifiers the items in the tree.

Parameters:

startNode - Node where to start the traversal. This item is included in the traversal.

treeAccessor - Handler for accessing the children of a node, and its identifier.

preOrderIterable

public static <TItem, TIdentifier> Iterable<TItem> preOrderIterable(TItem startNode,
 ITreeAccessor<TItem, TIdentifier> treeAccessor,
 long flags)

Creates an iterable over the tree's nodes in pre-order, starting at the given item.

Type Parameters:

TItem - Type of the items in the tree.

TIdentifier - Type of the identifier that identifiers the items in the tree.

Parameters:

startNode - Node where to start the traversal.

treeAccessor - Handler for accessing the children of a node, and its identifier.

flags - Flags that affect the iteration, see TreeIterationFlag for details.

preOrderIterable

public static <TItem, TIdentifier> Iterable<TItem> preOrderIterable(Iterable<? extends TItem> startItems,
 ITreeAccessor<TItem, TIdentifier> treeAccessor)

Creates an iterable over the tree's nodes in pre-order, starting at the given items.

Parameters:

startItems - Root items where to start the traversal. These items are included in the traversal.

treeAccessor - Handler for accessing the children of a node, and its identifier.

preOrderIterable

public static <TItem, TIdentifier> Iterable<TItem> preOrderIterable(Iterable<? extends TItem> startItems,
 ITreeAccessor<TItem, TIdentifier> treeAccessor,
 long flags)

Creates an iterable over the tree's nodes in pre-order, starting at the given items.

Parameters:

startItems - Root items where to start the traversal.

treeAccessor - Handler for accessing the children of a node, and its identifier.

flags - Flags that affect the iteration, see TreeIterationFlag for details.