/* * 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: DOMSignContext.java,v 1.9 2005/05/10 16:31:14 mullan Exp $ */package javax.xml.crypto.dsig.dom; import javax.xml.crypto.KeySelector;import javax.xml.crypto.dom.DOMCryptoContext;import javax.xml.crypto.dsig.XMLSignContext;import javax.xml.crypto.dsig.XMLSignature;import java.security.Key;import org.w3c.dom.Node; /** * A DOM-specific {@link XMLSignContext}. This class contains additional methods * to specify the location in a DOM tree where an {@link XMLSignature} * object is to be marshalled when generating the signature. * * <p>Note that <code>DOMSignContext</code> instances can contain * information and state specific to the XML signature structure it is * used with. The results are unpredictable if a * <code>DOMSignContext</code> is used with different signature structures * (for example, you should not use the same <code>DOMSignContext</code> * instance to sign two different {@link XMLSignature} objects). * * @author Sean Mullan * @author JSR 105 Expert Group * @since 1.6 */public class DOMSignContext extends DOMCryptoContext implements XMLSignContext {     private Node parent;    private Node nextSibling;     /**     * Creates a <code>DOMSignContext</code> with the specified signing key     * and parent node. The signing key is stored in a     * {@link KeySelector#singletonKeySelector singleton KeySelector} that is     * returned by the {@link #getKeySelector getKeySelector} method.     * The marshalled <code>XMLSignature</code> will be added as the last     * child element of the specified parent node unless a next sibling node is     * specified by invoking the {@link #setNextSibling setNextSibling} method.     *     * @param signingKey the signing key     * @param parent the parent node     * @throws NullPointerException if <code>signingKey</code> or     *    <code>parent</code> is <code>null</code>     */    public DOMSignContext(Key signingKey, Node parent) {        if (signingKey == null) {            throw new NullPointerException("signingKey cannot be null");        }        if (parent == null) {            throw new NullPointerException("parent cannot be null");        }        setKeySelector(KeySelector.singletonKeySelector(signingKey));        this.parent = parent;    }     /**     * Creates a <code>DOMSignContext</code> with the specified signing key,     * parent and next sibling nodes. The signing key is stored in a     * {@link KeySelector#singletonKeySelector singleton KeySelector} that is     * returned by the {@link #getKeySelector getKeySelector} method.     * The marshalled <code>XMLSignature</code> will be inserted as a child     * element of the specified parent node and immediately before the     * specified next sibling node.     *     * @param signingKey the signing key     * @param parent the parent node     * @param nextSibling the next sibling node     * @throws NullPointerException if <code>signingKey</code>,     *    <code>parent</code> or <code>nextSibling</code> is <code>null</code>     */    public DOMSignContext(Key signingKey, Node parent, Node nextSibling) {        if (signingKey == null) {            throw new NullPointerException("signingKey cannot be null");        }        if (parent == null) {            throw new NullPointerException("parent cannot be null");        }        if (nextSibling == null) {            throw new NullPointerException("nextSibling cannot be null");        }        setKeySelector(KeySelector.singletonKeySelector(signingKey));        this.parent = parent;        this.nextSibling = nextSibling;    }     /**     * Creates a <code>DOMSignContext</code> with the specified key selector     * and parent node. The marshalled <code>XMLSignature</code> will be added     * as the last child element of the specified parent node unless a next     * sibling node is specified by invoking the     * {@link #setNextSibling setNextSibling} method.     *     * @param ks the key selector     * @param parent the parent node     * @throws NullPointerException if <code>ks</code> or <code>parent</code>     *    is <code>null</code>     */    public DOMSignContext(KeySelector ks, Node parent) {        if (ks == null) {            throw new NullPointerException("key selector cannot be null");        }        if (parent == null) {            throw new NullPointerException("parent cannot be null");        }        setKeySelector(ks);        this.parent = parent;    }     /**     * Creates a <code>DOMSignContext</code> with the specified key selector,     * parent and next sibling nodes. The marshalled <code>XMLSignature</code>     * will be inserted as a child element of the specified parent node and     * immediately before the specified next sibling node.     *     * @param ks the key selector     * @param parent the parent node     * @param nextSibling the next sibling node     * @throws NullPointerException if <code>ks</code>, <code>parent</code> or     *    <code>nextSibling</code> is <code>null</code>     */    public DOMSignContext(KeySelector ks, Node parent, Node nextSibling) {        if (ks == null) {            throw new NullPointerException("key selector cannot be null");        }        if (parent == null) {            throw new NullPointerException("parent cannot be null");        }        if (nextSibling == null) {            throw new NullPointerException("nextSibling cannot be null");        }        setKeySelector(ks);        this.parent = parent;        this.nextSibling = nextSibling;    }     /**     * Sets the parent node.     *     * @param parent the parent node. The marshalled <code>XMLSignature</code>     *    will be added as a child element of this node.     * @throws NullPointerException if <code>parent</code> is <code>null</code>     * @see #getParent     */    public void setParent(Node parent) {        if (parent == null) {            throw new NullPointerException("parent is null");        }        this.parent = parent;    }     /**     * Sets the next sibling node.     *     * @param nextSibling the next sibling node. The marshalled     *    <code>XMLSignature</code> will be inserted immediately before this     *    node. Specify <code>null</code> to remove the current setting.     * @see #getNextSibling     */    public void setNextSibling(Node nextSibling) {        this.nextSibling = nextSibling;    }     /**     * Returns the parent node.     *     * @return the parent node (never <code>null</code>)     * @see #setParent(Node)     */    public Node getParent() {        return parent;    }     /**     * Returns the nextSibling node.     *     * @return the nextSibling node, or <code>null</code> if not specified.     * @see #setNextSibling(Node)     */    public Node getNextSibling() {        return nextSibling;    }}