/*
 * 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
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/*
 * $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 XMLSignContext. This class contains additional methods to specify the location in a DOM tree where an XMLSignature object is to be marshalled when generating the signature. 
Note that DOMSignContext instances can contain
information and state specific to the XML signature structure it is
used with. The results are unpredictable if a
DOMSignContext is used with different signature structures
(for example, you should not use the same DOMSignContext instance to sign two different XMLSignature objects). 
Author:
Sean Mullan, JSR 105 Expert Group
Since:
1.6/**
 * 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 DOMSignContext with the specified signing key and parent node. The signing key is stored in a singleton KeySelector that is returned by the getKeySelector method. The marshalled XMLSignature will be added as the last child element of the specified parent node unless a next sibling node is specified by invoking the setNextSibling method. 
Params:
signingKey – the signing key
parent – the parent node
Throws:
NullPointerException – if signingKey or
   parent is null/**
     * 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 DOMSignContext with the specified signing key, parent and next sibling nodes. The signing key is stored in a singleton KeySelector that is returned by the getKeySelector method. The marshalled XMLSignature will be inserted as a child
element of the specified parent node and immediately before the
specified next sibling node.
Params:
signingKey – the signing key
parent – the parent node
nextSibling – the next sibling node
Throws:
NullPointerException – if signingKey,
   parent or nextSibling is null/**
     * 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 DOMSignContext with the specified key selector
and parent node. The marshalled XMLSignature will be added as the last child element of the specified parent node unless a next sibling node is specified by invoking the setNextSibling method. 
Params:
ks – the key selector
parent – the parent node
Throws:
NullPointerException – if ks or parent
   is null/**
     * 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 DOMSignContext with the specified key selector,
parent and next sibling nodes. The marshalled XMLSignature
will be inserted as a child element of the specified parent node and
immediately before the specified next sibling node.
Params:
ks – the key selector
parent – the parent node
nextSibling – the next sibling node
Throws:
NullPointerException – if ks, parent or
   nextSibling is null/**
     * 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.
Params:
parent – the parent node. The marshalled XMLSignature
   will be added as a child element of this node.
Throws:
NullPointerException – if parent is null
See Also:
getParent/**
     * 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.
Params:
nextSibling – the next sibling node. The marshalled
   XMLSignature will be inserted immediately before this
   node. Specify null to remove the current setting.
See Also:
getNextSibling/**
     * 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.
See Also:
setParent(Node)
Returns:
the parent node (never null)/**
     * Returns the parent node.
     *
     * @return the parent node (never <code>null</code>)
     * @see #setParent(Node)
     */
    public Node getParent() {
        return parent;
    }

    
Returns the nextSibling node.
See Also:
setNextSibling(Node)
Returns:
the nextSibling node, or null if not specified./**
     * Returns the nextSibling node.
     *
     * @return the nextSibling node, or <code>null</code> if not specified.
     * @see #setNextSibling(Node)
     */
    public Node getNextSibling() {
        return nextSibling;
    }
}