/*

 * Copyright 1997-2003 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.security.x509;

import java.util.*;

import java.io.IOException;

import sun.security.util.*;

/**

 * This object class represents the GeneralNames type required in

 * X509 certificates.

 * <p>The ASN.1 syntax for this is:

 * <pre>

 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName

 * </pre>

 *

 * @author Amit Kapoor

 * @author Hemma Prafullchandra

 *

 */

public class GeneralNames {

    private final List<GeneralName> names;

    /**

     * Create the GeneralNames, decoding from the passed DerValue.

     *

     * @param derVal the DerValue to construct the GeneralNames from.

     * @exception IOException on error.

     */

    public GeneralNames(DerValue derVal) throws IOException {

        this();

        if (derVal.tag != DerValue.tag_Sequence) {

            throw new IOException("Invalid encoding for GeneralNames.");

        }

        if (derVal.data.available() == 0) {

            throw new IOException("No data available in "

                                      + "passed DER encoded value.");

        }

        // Decode all the GeneralName's

        while (derVal.data.available() != 0) {

            DerValue encName = derVal.data.getDerValue();

            GeneralName name = new GeneralName(encName);

            add(name);

        }

    }

    /**

     * The default constructor for this class.

     */

    public GeneralNames() {

        names = new ArrayList<GeneralName>();

    }

    public GeneralNames add(GeneralName name) {

        if (name == null) {

            throw new NullPointerException();

        }

        names.add(name);

        return this;

    }

    public GeneralName get(int index) {

        return names.get(index);

    }

    public boolean isEmpty() {

        return names.isEmpty();

    }

    public int size() {

        return names.size();

    }

    public Iterator<GeneralName> iterator() {

        return names.iterator();

    }

    public List<GeneralName> names() {

        return names;

    }

    /**

     * Write the extension to the DerOutputStream.

     *

     * @param out the DerOutputStream to write the extension to.

     * @exception IOException on error.

     */

    public void encode(DerOutputStream out) throws IOException {

        if (isEmpty()) {

            return;

        }

        DerOutputStream temp = new DerOutputStream();

        for (GeneralName gn : names) {

            gn.encode(temp);

        }

        out.write(DerValue.tag_Sequence, temp);

    }

    /**

     * compare this GeneralNames to other object for equality

     *

     * @returns true iff this equals other

     */

    public boolean equals(Object obj) {

        if (this == obj) {

            return true;

        }

        if (obj instanceof GeneralNames == false) {

            return false;

        }

        GeneralNames other = (GeneralNames)obj;

        return this.names.equals(other.names);

    }

    public int hashCode() {

        return names.hashCode();

    }

    public String toString() {

        return names.toString();

    }

}