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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.x509;

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

/**
 * This class contains a collection for collection based X509Stores.
 * 
 * @see org.bouncycastle.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();
    }
}