/*-- 

 Copyright (C) 2001 Brett McLaughlin.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows 
    these conditions in the documentation and/or other materials 
    provided with the distribution.

 3. The name "Java and XML" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact brett@newInstance.com.
 
 In addition, we request (but do not require) that you include in the 
 end-user documentation provided with the redistribution and/or in the 
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed for the
      'Java and XML' book, by Brett McLaughlin (O'Reilly & Associates)."

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 */
package javaxml2;

import java.io.File;

// DOM imports
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.traversal.DocumentTraversal;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.NodeIterator;

// Vendor parser
import org.apache.xerces.parsers.DOMParser;

/**
 * <b><code>ItemSearcher</code></b> shows how the DOM Level 2 Traversal
 *   module can be used for searching through a document.
 */
public class ItemSearcher {

    /** The default namespace for the document to search through */
    private String docNS = "http://www.oreilly.com/javaxml2";

    /**
     * <p>This method takes a file, and searches it for specific
     *   pieces of data using DOM traversal.</p>
     *
     * @param filename name of XML file to search through.
     * @throws <code>Exception</code> - generic problem handling.
     */
    public void search(String filename) throws Exception {
        // Parse into a DOM tree
        File file = new File(filename);
        DOMParser parser = new DOMParser();
        parser.parse(file.toURL().toString());
        Document doc = parser.getDocument();

        // Get node to start iterating with
        Element root = doc.getDocumentElement();
        NodeList descriptionElements = 
            root.getElementsByTagNameNS(docNS, "description");
        Element description = (Element)descriptionElements.item(0);

        // Get a NodeIterator
        NodeIterator i = ((DocumentTraversal)doc)
            .createNodeIterator(description, NodeFilter.SHOW_ALL, 
                new FormattingNodeFilter(), true);

        Node n;
        while ((n = i.nextNode()) != null) {
            System.out.println("Search phrase found: '" + n.getNodeValue() + "'");
        }
    }

    /**
     * <p>Provide a static entry point.</p>
     */
    public static void main(String[] args) {
        if (args.length == 0) {
            System.out.println("No item files to search through specified.");
            return;
        }

        try {
            ItemSearcher searcher = new ItemSearcher();
            for (int i=0; i<args.length; i++) {
                System.out.println("Processing file: " + args[i]);
                searcher.search(args[i]);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class FormattingNodeFilter implements NodeFilter {

    public short acceptNode(Node n) {
        if (n.getNodeType() == Node.TEXT_NODE) {
            Node parent = n.getParentNode();
            if ((parent.getNodeName().equalsIgnoreCase("b")) ||
                (parent.getNodeName().equalsIgnoreCase("i"))) {
                return FILTER_ACCEPT;
            }
        }
        // If we got here, not interested
        return FILTER_SKIP;
    }
}