ListItemModel.java

package fr.openwide.core.wicket.more.markup.html.model;

import java.util.List;

import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;

public class ListItemModel<T> implements IModel<T> {
	
	private static final long serialVersionUID = -7747826759295752059L;

	private final IModel<? extends List<T>> listModel;
	
	private final IModel<Integer> indexModel;

	public ListItemModel(IModel<? extends List<T>> listModel, int index) {
		this(listModel, Model.of(index));
	}

	public ListItemModel(IModel<? extends List<T>> listModel, IModel<Integer> indexModel) {
		super();
		this.listModel = listModel;
		this.indexModel = indexModel;
	}
	
	@Override
	public int hashCode() {
		return new HashCodeBuilder()
				.append(listModel)
				.append(indexModel)
				.toHashCode();
	}
	
	@Override
	public boolean equals(Object obj) {
		if (obj == null) {
			return false;
		}
		if (obj == this) {
			return true;
		}
		if (!(obj instanceof ListItemModel)) {
			return false;
		}
		ListItemModel<?> other = (ListItemModel<?>) obj;
		return new EqualsBuilder()
				.append(listModel, other.listModel)
				.append(indexModel, other.indexModel)
				.build();
	}

	@Override
	public T getObject() {
		return listModel.getObject().get(indexModel.getObject());
	}
	
	@Override
	public void setObject(T object) {
		listModel.getObject().set(indexModel.getObject(), object);
	}
	
	@Override
	public void detach() {
		listModel.detach();
		indexModel.detach();
	}
	
	public IModel<? extends List<T>> getListModel() {
		return listModel;
	}
	
	public IModel<Integer> getIndexModel() {
		return indexModel;
	}
}