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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.x509;

import java.util.ArrayList;
import java.util.Collection;

/**
 * This class contains a collection for collection based X509Stores.
 * 
 * @see org.spongycastle.x509.X509Store
 * 
 */
public class X509CollectionStoreParameters
    implements X509StoreParameters
{
    private Collection collection;

    /**
     * Constructor.
     * 
     * The collection is copied.
     * 
     * 
     * @param collection
     *            The collection containing X.509 object types.
     * @throws NullPointerException if collection is null.
     */
    public X509CollectionStoreParameters(Collection collection)
    {
        if (collection == null)
        {
            throw new NullPointerException("collection cannot be null");
        }
        this.collection = collection;
    }

    /**
     * Returns a shallow clone. The returned contents are not copied, so adding
     * or removing objects will effect this.
     * 
     * @return a shallow clone.
     */
    public Object clone()
    {
        return new X509CollectionStoreParameters(collection);
    }
    
    /**
     * Returns a copy of the Collection.
     * 
     * @return The Collection. Is never null.
     */
    public Collection getCollection()
    {
        return new ArrayList(collection);
    }
    
    /**
     * Returns a formatted string describing the parameters.
     * 
     * @return a formatted string describing the parameters
     */
    public String toString()
    {
        StringBuffer sb = new StringBuffer();
        sb.append("X509CollectionStoreParameters: [\n");
        sb.append("  collection: " + collection + "\n");
        sb.append("]");
        return sb.toString();
    }
}