JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2005, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 * $Id: DOMStructure.java,v 1.6 2005/05/09 18:33:26 mullan Exp $
 */
package javax.xml.crypto.dom;

import org.w3c.dom.Node;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dsig.XMLSignature;

/**
 * A DOM-specific {@link XMLStructure}. The purpose of this class is to
 * allow a DOM node to be used to represent extensible content (any elements
 * or mixed content) in XML Signature structures.
 *
 * <p>If a sequence of nodes is needed, the node contained in the
 * <code>DOMStructure</code> is the first node of the sequence and successive
 * nodes can be accessed by invoking {@link Node#getNextSibling}.
 *
 * <p>If the owner document of the <code>DOMStructure</code> is different than
 * the target document of an <code>XMLSignature</code>, the
 * {@link XMLSignature#sign(XMLSignContext)} method imports the node into the
 * target document before generating the signature.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @since 1.6
 */
public class DOMStructure implements XMLStructure {

    private final Node node;

    /**
     * Creates a <code>DOMStructure</code> containing the specified node.
     *
     * @param node the node
     * @throws NullPointerException if <code>node</code> is <code>null</code>
     */
    public DOMStructure(Node node) {
        if (node == null) {
            throw new NullPointerException("node cannot be null");
        }
        this.node = node;
    }

    /**
     * Returns the node contained in this <code>DOMStructure</code>.
     *
     * @return the node
     */

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