/*

 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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/*

 * $Id: ExcC14NParameterSpec.java,v 1.7 2005/05/13 18:45:42 mullan Exp $

 */

package javax.xml.crypto.dsig.spec;

import javax.xml.crypto.dsig.CanonicalizationMethod;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

/**

 * Parameters for the W3C Recommendation:

 * <a href="http://www.w3.org/TR/xml-exc-c14n/">

 * Exclusive XML Canonicalization (C14N) algorithm</a>. The

 * parameters include an optional inclusive namespace prefix list. The XML

 * Schema Definition of the Exclusive XML Canonicalization parameters is

 * defined as:

 * <pre><code>

 * <schema xmlns="http://www.w3.org/2001/XMLSchema"

 *         xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"

 *         targetNamespace="http://www.w3.org/2001/10/xml-exc-c14n#"

 *         version="0.1" elementFormDefault="qualified">

 *

 * <element name="InclusiveNamespaces" type="ec:InclusiveNamespaces"/>

 * <complexType name="InclusiveNamespaces">

 *   <attribute name="PrefixList" type="xsd:string"/>

 * </complexType>

 * </schema>

 * </code></pre>

 *

 * @author Sean Mullan

 * @author JSR 105 Expert Group

 * @since 1.6

 * @see CanonicalizationMethod

 */

public final class ExcC14NParameterSpec implements C14NMethodParameterSpec {

    private List<String> preList;

    /**

     * Indicates the default namespace ("#default").

     */

    public static final String DEFAULT = "#default";

    /**

     * Creates a <code>ExcC14NParameterSpec</code> with an empty prefix

     * list.

     */

    public ExcC14NParameterSpec() {

        preList = Collections.emptyList();

    }

    /**

     * Creates a <code>ExcC14NParameterSpec</code> with the specified list

     * of prefixes. The list is copied to protect against subsequent

     * modification.

     *

     * @param prefixList the inclusive namespace prefix list. Each entry in

     *    the list is a <code>String</code> that represents a namespace prefix.

     * @throws NullPointerException if <code>prefixList</code> is

     *    <code>null</code>

     * @throws ClassCastException if any of the entries in the list are not

     *    of type <code>String</code>

     */

    @SuppressWarnings("rawtypes")

    public ExcC14NParameterSpec(List prefixList) {

        if (prefixList == null) {

            throw new NullPointerException("prefixList cannot be null");

        }

        List<?> copy = new ArrayList<>((List<?>)prefixList);

        for (int i = 0, size = copy.size(); i < size; i++) {

            if (!(copy.get(i) instanceof String)) {

                throw new ClassCastException("not a String");

            }

        }

        @SuppressWarnings("unchecked")

        List<String> temp = (List<String>)copy;

        preList = Collections.unmodifiableList(temp);

    }

    /**

     * Returns the inclusive namespace prefix list. Each entry in the list

     * is a <code>String</code> that represents a namespace prefix.

     *

     * <p>This implementation returns an {@link

     * java.util.Collections#unmodifiableList unmodifiable list}.

     *

     * @return the inclusive namespace prefix list (may be empty but never

     *    <code>null</code>)

     */

    @SuppressWarnings("rawtypes")

    public List getPrefixList() {

        return preList;

    }

}