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package org.apache.commons.collections.bag;

import java.util.Set;

import org.apache.commons.collections.Bag;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.collection.PredicatedCollection;

/**
 * Decorates another <code>Bag</code> to validate that additions
 * match a specified predicate.
 * <p>
 * If an object cannot be added to the list, an IllegalArgumentException
 * is thrown.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 1.3 $ $Date: 2004/01/14 21:43:08 $
 * 
 * @author Stephen Colebourne
 * @author Paul Jack
 */
public class PredicatedBag
        extends PredicatedCollection implements Bag {

    /**
     * Factory method to create a predicated (validating) bag.
     * <p>
     * If there are any elements already in the bag being decorated, they
     * are validated.
     * 
     * @param bag  the bag to decorate, must not be null
     * @param predicate  the predicate to use for validation, must not be null
     * @throws IllegalArgumentException if bag or predicate is null
     * @throws IllegalArgumentException if the bag contains invalid elements
     */
    public static Bag decorate(Bag bag, Predicate predicate) {
        return new PredicatedBag(bag, predicate);
    }

    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * <p>
     * If there are any elements already in the bag being decorated, they
     * are validated.
     * 
     * @param bag  the bag to decorate, must not be null
     * @param predicate  the predicate to use for validation, must not be null
     * @throws IllegalArgumentException if bag or predicate is null
     * @throws IllegalArgumentException if the bag contains invalid elements
     */
    protected PredicatedBag(Bag bag, Predicate predicate) {
        super(bag, predicate);
    }

    /**
     * Gets the decorated bag.
     * 
     * @return the decorated bag
     */
    protected Bag getBag() {
        return (Bag) getCollection();
    }
    
    //-----------------------------------------------------------------------
    public boolean add(Object object, int count) {
        validate(object);
        return getBag().add(object, count);
    }

    public boolean remove(Object object, int count) {
        return getBag().remove(object, count);
    }

    public Set uniqueSet() {
        return getBag().uniqueSet();
    }

    public int getCount(Object object) {
        return getBag().getCount(object);
    }

}
