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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.event;

import net.sf.saxon.om.NodeInfo;

/**
 * A BuilderMonitor can be inserted into a pipeline immediately in front of a Builder. During tree construction,
 * the method markNextNode() can be called to request that the next node to be created is treated specially by
 * remembering the current position on the tree; on completion of the tree construction, the method getMarkedNode()
 * can be called to return the NodeInfo that was created immediately after calling markNextNode().
 */
public abstract class BuilderMonitor extends ProxyReceiver {

    public BuilderMonitor(Receiver next) {
        super(next);
    }

    /**
     * Indicate that the next node to be created will be of a given type, and request the monitor to remember
     * the identity of this node.
     *
     * @param nodeKind the kind of node that will be created next. This will always be an element, text, comment,
     * or processing-instruction node
     */

    public abstract void markNextNode(int nodeKind);

    /**
     * Indicate that the most recently written attribute whose name matches that of the supplied node
     * is to act as the marked node
     * @param origin the attribute in the input corresponding to the marked node in the output
     */

    public abstract void markAttributeNode(NodeInfo origin);

    /**
     * Indicate that the most recently written attribute whose name matches that of the supplied node
     * is to act as the marked node
     * @param origin the attribute in the input corresponding to the marked node in the output
     */

    public abstract void markNamespaceNode(NodeInfo origin);

    /**
     * On completion of tree building, get the node that was marked using markNextNode().
     *
     * @return the marked node, or null if none was marked
     */

    public abstract NodeInfo getMarkedNode();
}