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/*
 * 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;
    }

    /**

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