com.phloc.commons.parent.impl.ChildrenProviderHasChildren Maven / Gradle / Ivy
/**
* Copyright (C) 2006-2015 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.phloc.commons.parent.impl;
import java.util.Collection;
import javax.annotation.Nonnegative;
import javax.annotation.Nullable;
import com.phloc.commons.parent.IChildrenProvider;
import com.phloc.commons.parent.IHasChildren;
/**
* A standard implementation of the {@link IChildrenProvider} interface that
* works with all types that implement {@link IHasChildren}.
*
* @author Philip Helger
* @param
* The data type of the child objects.
*/
public class ChildrenProviderHasChildren > implements
IChildrenProvider
{
public final boolean hasChildren (@Nullable final CHILDTYPE aCurrent)
{
return aCurrent != null && aCurrent.hasChildren ();
}
@Nonnegative
public final int getChildCount (@Nullable final CHILDTYPE aCurrent)
{
return aCurrent == null ? 0 : aCurrent.getChildCount ();
}
@Nullable
public Collection getChildren (@Nullable final CHILDTYPE aCurrent)
{
return aCurrent == null ? null : aCurrent.getChildren ();
}
}