com.webmethods.caf.faces.data.tree.object
Class TreeBuilder

java.lang.Object
  com.webmethods.caf.faces.data.tree.object.TreeBuilder

public class TreeBuilder
extends Object

Helper class for building trees.

Constructor Summary

TreeBuilder()

Method Summary

static List	buildFromChildIds(List rows, String rowVariable, ValueBinding rowIdBinding, ValueBinding childIdsBinding) Build a tree out a list of rows, where the tree structure is determined by child-ids bindings (ie each row contains a field with the ids of its children).
static List	buildFromParentIds(List rows, String rowVariable, ValueBinding rowIdBinding, ValueBinding parentIdBinding) Build a tree out a list of rows, where the tree structure is determined by parent-id bindings (ie each row contains a field with the id of its parent).

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeBuilder

public TreeBuilder()

Method Detail

buildFromParentIds

public static List buildFromParentIds(List rows,
                                      String rowVariable,
                                      ValueBinding rowIdBinding,
                                      ValueBinding parentIdBinding)

Build a tree out a list of rows, where the tree structure is determined by parent-id bindings (ie each row contains a field with the id of its parent).

Parameters:

rows - List of rows. This may be empty, but not null.

rowVariable - Row variable used in row-id and parent-id bindings. For example, if the row-id binding is #{row.id}, the row variable is "row".

rowIdBinding - Binding expression that calculates the row-id for the current row. This must return a unique string id for each row.

parentIdBinding - Binding expression that calculates the parent-id for the current row. This must return null for rows that represent roots, and a valid parent row-id for all other rows.

Returns:

List of INode roots of the tree. Never null; may be empty if original list of rows was empty.

buildFromChildIds

public static List buildFromChildIds(List rows,
                                     String rowVariable,
                                     ValueBinding rowIdBinding,
                                     ValueBinding childIdsBinding)

Build a tree out a list of rows, where the tree structure is determined by child-ids bindings (ie each row contains a field with the ids of its children).

Parameters:

rows - List of rows. This may be empty, but not null.

rowVariable - Row variable used in row-id and child-ids bindings. For example, if the row-id binding is #{row.id}, the row variable is "row".

rowIdBinding - Binding expression that calculates the row-id for the current row. This must return a unique string id for each row.

childIdsBinding - Binding expression that calculates the child-ids for the current row. This must return a comma-separated String of row-ids, a Collection of row-ids, an array of String row-ids, or null. It may return an empty string, collection, or array.

Returns:

List of INode roots of the tree. Never null; may be empty if original list of rows was empty.