ContextualActionModePresentationModel.java

package org.robobinding.gallery.presentationmodel;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.robobinding.annotation.ItemPresentationModel;
import org.robobinding.annotation.PresentationModel;
import org.robobinding.gallery.model.MemoryProductStore;
import org.robobinding.gallery.model.Product;
import org.robobinding.presentationmodel.HasPresentationModelChangeSupport;
import org.robobinding.presentationmodel.PresentationModelChangeSupport;

/**
 * @author Cheng Wei
 * @version $Revision: 1.0 $
 * @since 1.0
 */
@PresentationModel
public class ContextualActionModePresentationModel implements HasPresentationModelChangeSupport{
    private final MemoryProductStore productStore;
    private final PresentationModelChangeSupport changeSupport;
    private Set<Integer> selectedProductIndexes;

    public ContextualActionModePresentationModel(MemoryProductStore productStore) {
        this.productStore = productStore;
        changeSupport = new PresentationModelChangeSupport(this);
        selectedProductIndexes = new HashSet<Integer>();
    }

    @ItemPresentationModel(value = ToStringItemPresentationModel.class)
    public List<Product> getProducts() {
        return productStore.getAll();
    }

    public void deleteSelectedProducts() {
        List<Integer> indexes = new ArrayList<Integer>(selectedProductIndexes);
        selectedProductIndexes.clear();
        Collections.sort(indexes);
        Collections.reverse(indexes);
        for (Integer index : indexes) {
            productStore.remove(index);
        }

        refreshProducts();
    }

    private void refreshProducts() {
        changeSupport.firePropertyChange("selectedProductIndexes");
        changeSupport.firePropertyChange("products");
    }

    public Set<Integer> getSelectedProductIndexes() {
        return selectedProductIndexes;
    }

    public void setSelectedProductIndexes(Set<Integer> selectedProductIndexes) {
        this.selectedProductIndexes = selectedProductIndexes;
    }

    @Override
    public PresentationModelChangeSupport getPresentationModelChangeSupport() {
        return changeSupport;
    }
}