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Utility classes developed at Adrian Smith Software (A.S.S.)

There is a newer version: 21.0.1

package com.databasesandlife.util.wicket;

import org.apache.wicket.model.AbstractWrapModel;
import org.apache.wicket.model.IModel;

import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedMap;

/**
 * Takes an underlying model which returns a map, and returns that map's keys.
 *   
 *       Performance note: 
 *       Do not use this in a ListView if there are a large number of entries (e.g. more than 1,000).
 *       Unfortunately the model's getObject method gets called a great number of times if it's used as a ListView's model,
 *       and the populateItem method calls getModelObject, which does a listView.getModel().get(i).
 *   
 *
 * @author This source is copyright Adrian Smith and licensed under the LGPL 3.
 * @see Project on GitHub
 */
public class MapKeyModel> extends AbstractWrapModel> {

    final @Nonnull IModel> wrappedModel;

    public MapKeyModel(@Nonnull IModel> wrappedModel) {
        this.wrappedModel = wrappedModel;
    }

    @Override public IModel> getWrappedModel() {
        return wrappedModel;
    }

    @Override public List getObject() {
        return new ArrayList<>(getWrappedModel().getObject().keySet());
    }
}