Package com.helger.commons.hierarchy

Interface IHasChildrenSorted<CHILDTYPE>

Type Parameters:

CHILDTYPE - The type of the children.

All Superinterfaces:

IHasChildren<CHILDTYPE>

public interface IHasChildrenSorted<CHILDTYPE>
extends IHasChildren<CHILDTYPE>

Extends IHasChildren by indicating that the child items are sorted!

Author:

Philip Helger

Method Summary

Modifier and Type	Method	Description
default CHILDTYPE	findFirstChild(Predicate<? super CHILDTYPE> aFilter)	Find the first direct child that matches the passed predicate.
default <DSTTYPE> DSTTYPE	findFirstChildMapped(Predicate<? super CHILDTYPE> aFilter, Function<? super CHILDTYPE,? extends DSTTYPE> aMapper)	Find the first direct child that matches the passed predicate.
ICommonsList<? extends CHILDTYPE>	getAllChildren()
CHILDTYPE	getChildAtIndex(int nIndex)	Get the child node at the specified index
default CHILDTYPE	getFirstChild()	Get the first child node or null if no child is present
default CHILDTYPE	getLastChild()	Get the last child node or null if no child is present

Methods inherited from interface com.helger.commons.hierarchy.IHasChildren

forAllChildren, forAllChildren, forAllChildrenBreakable, forAllChildrenMapped, getChildCount, getChildren, hasChildren, hasNoChildren

Method Details

getAllChildren

@Nullable
ICommonsList<? extends CHILDTYPE> getAllChildren()

Specified by:

getAllChildren in interface IHasChildren<CHILDTYPE>

Returns:

A ordered list of child elements. May be null if no children are present.

See Also:

• IHasChildren.hasChildren()
• IHasChildren.getChildren()

getChildAtIndex

@Nullable
CHILDTYPE getChildAtIndex(@Nonnegative
 int nIndex)

Get the child node at the specified index

Parameters:

nIndex - The index to be queried. May not be < 0 or ≥ the number of children

Returns:

The child at the specified index or null if the index is invalid.

Throws:

IndexOutOfBoundsException - in case the index is invalid

getFirstChild

@Nullable
default CHILDTYPE getFirstChild()

Get the first child node or null if no child is present

Returns:

The first child or null.

findFirstChild

@Nullable
default CHILDTYPE findFirstChild(@Nonnull
 Predicate<? super CHILDTYPE> aFilter)

Find the first direct child that matches the passed predicate.

Parameters:

aFilter - The filter that is applied on each direct child node. May not be null.

Returns:

null if no direct child matches the passed filter or if no child is present at all.

findFirstChildMapped

@Nullable
default <DSTTYPE> DSTTYPE findFirstChildMapped(@Nonnull
 Predicate<? super CHILDTYPE> aFilter,
 @Nonnull
 Function<? super CHILDTYPE,? extends DSTTYPE> aMapper)

Find the first direct child that matches the passed predicate.

Type Parameters:

DSTTYPE - The destination type to be mapped to

Parameters:

aFilter - The filter that is applied on each direct child node. May not be null.

aMapper - The mapping function from micro node to the target type. May not be null.

Returns:

null if no direct child matches the passed filter or if no child is present at all.

getLastChild

@Nullable
default CHILDTYPE getLastChild()

Get the last child node or null if no child is present

Returns:

The last child or null.