Traverse a DOM tree in order to get information about the document. : DOM Tree « XML « Java

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Java » XML » DOM TreeScreenshots 
Traverse a DOM tree in order to get information about the document.
   
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 
 *      http://www.apache.org/licenses/LICENSE-2.0
 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.io.PrintWriter;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXParseException;

/**
 * A sample DOM counter. This sample program illustrates how to
 * traverse a DOM tree in order to get information about the document.
 * The output of this program shows the time and count of elements,
 * attributes, ignorable whitespaces, and characters appearing in
 * the document. Three times are shown: the parse time, the first
 * traversal of the document, and the second traversal of the tree.
 * <p>
 * This class is useful as a "poor-man's" performance tester to
 * compare the speed and accuracy of various DOM parsers. However,
 * it is important to note that the first parse time of a parser
 * will include both VM class load time and parser initialization
 * that would not be present in subsequent parses with the same
 * file.
 * <p>
 * <strong>Note:</strong> The results produced by this program
 * should never be accepted as true performance measurements.
 *
 @author Andy Clark, IBM
 *
 @version $Id: Counter.java 447683 2006-09-19 02:36:31Z mrglavas $
 */
public class Counter {

    //
    // Constants
    //

    // feature ids

    /** Namespaces feature id (http://xml.org/sax/features/namespaces). */
    protected static final String NAMESPACES_FEATURE_ID = "http://xml.org/sax/features/namespaces";

    /** Validation feature id (http://xml.org/sax/features/validation). */
    protected static final String VALIDATION_FEATURE_ID = "http://xml.org/sax/features/validation";

    /** Schema validation feature id (http://apache.org/xml/features/validation/schema). */
    protected static final String SCHEMA_VALIDATION_FEATURE_ID = "http://apache.org/xml/features/validation/schema";

    /** Schema full checking feature id (http://apache.org/xml/features/validation/schema-full-checking). */
    protected static final String SCHEMA_FULL_CHECKING_FEATURE_ID = "http://apache.org/xml/features/validation/schema-full-checking";
    
    /** Honour all schema locations feature id (http://apache.org/xml/features/honour-all-schemaLocations). */
    protected static final String HONOUR_ALL_SCHEMA_LOCATIONS_ID = "http://apache.org/xml/features/honour-all-schemaLocations";
    
    /** Validate schema annotations feature id (http://apache.org/xml/features/validate-annotations). */
    protected static final String VALIDATE_ANNOTATIONS_ID = "http://apache.org/xml/features/validate-annotations";
    
    /** Dynamic validation feature id (http://apache.org/xml/features/validation/dynamic). */
    protected static final String DYNAMIC_VALIDATION_FEATURE_ID = "http://apache.org/xml/features/validation/dynamic";
    
    /** XInclude feature id (http://apache.org/xml/features/xinclude). */
    protected static final String XINCLUDE_FEATURE_ID = "http://apache.org/xml/features/xinclude";
    
    /** XInclude fixup base URIs feature id (http://apache.org/xml/features/xinclude/fixup-base-uris). */
    protected static final String XINCLUDE_FIXUP_BASE_URIS_FEATURE_ID = "http://apache.org/xml/features/xinclude/fixup-base-uris";
    
    /** XInclude fixup language feature id (http://apache.org/xml/features/xinclude/fixup-language). */
    protected static final String XINCLUDE_FIXUP_LANGUAGE_FEATURE_ID = "http://apache.org/xml/features/xinclude/fixup-language";

    // default settings

    /** Default parser name (dom.wrappers.Xerces). */
    protected static final String DEFAULT_PARSER_NAME = "dom.wrappers.Xerces";

    /** Default repetition (1). */
    protected static final int DEFAULT_REPETITION = 1;

    /** Default namespaces support (true). */
    protected static final boolean DEFAULT_NAMESPACES = true;

    /** Default validation support (false). */
    protected static final boolean DEFAULT_VALIDATION = false;

    /** Default Schema validation support (false). */
    protected static final boolean DEFAULT_SCHEMA_VALIDATION = false;

    /** Default Schema full checking support (false). */
    protected static final boolean DEFAULT_SCHEMA_FULL_CHECKING = false;
    
    /** Default honour all schema locations (false). */
    protected static final boolean DEFAULT_HONOUR_ALL_SCHEMA_LOCATIONS = false;
    
    /** Default validate schema annotations (false). */
    protected static final boolean DEFAULT_VALIDATE_ANNOTATIONS = false;

    /** Default dynamic validation support (false). */
    protected static final boolean DEFAULT_DYNAMIC_VALIDATION = false;
    
    /** Default XInclude processing support (false). */
    protected static final boolean DEFAULT_XINCLUDE = false;
    
    /** Default XInclude fixup base URIs support (true). */
    protected static final boolean DEFAULT_XINCLUDE_FIXUP_BASE_URIS = true;
    
    /** Default XInclude fixup language support (true). */
    protected static final boolean DEFAULT_XINCLUDE_FIXUP_LANGUAGE = true;

    //
    // Data
    //

    /** Number of elements. */
    protected long fElements;

    /** Number of attributes. */
    protected long fAttributes;

    /** Number of characters. */
    protected long fCharacters;

    /** Number of ignorable whitespace characters. */
    protected long fIgnorableWhitespace;

    /** Document information. */
    protected ParserWrapper.DocumentInfo fDocumentInfo;

    //
    // Public methods
    //

    /** Sets the parser wrapper. */
    public void setDocumentInfo(ParserWrapper.DocumentInfo documentInfo) {
        fDocumentInfo = documentInfo;
    // setDocumentInfo(ParserWrapper.DocumentInfo)

    /** Traverses the specified node, recursively. */
    public void count(Node node) {

        // is there anything to do?
        if (node == null) {
            return;
        }

        int type = node.getNodeType();
        switch (type) {
            case Node.DOCUMENT_NODE: {
                fElements = 0;
                fAttributes = 0;
                fCharacters = 0;
                fIgnorableWhitespace = 0;
                Document document = (Document)node;
                count(document.getDocumentElement());
                break;
            }

            case Node.ELEMENT_NODE: {
                fElements++;
                NamedNodeMap attrs = node.getAttributes();
                if (attrs != null) {
                    fAttributes += attrs.getLength();
                }
                // drop through to entity reference
            }

            case Node.ENTITY_REFERENCE_NODE: {
                Node child = node.getFirstChild();
                while (child != null) {
                    count(child);
                    child = child.getNextSibling();
                }
                break;
            }

            case Node.CDATA_SECTION_NODE: {
                fCharacters += ((Text)node).getLength();
                break;
            }

            case Node.TEXT_NODE: {
                if (fDocumentInfo != null) {
                    Text text = (Text)node;
                    int length = text.getLength();
                    if (fDocumentInfo.isIgnorableWhitespace(text)) {
                        fIgnorableWhitespace += length;
                    }
                    else {
                        fCharacters += length;
                    }
                }
                break;
            }
        }

    // count(Node)

    /** Prints the results. */
    public void printResults(PrintWriter out, String uri,
                             long parse, long traverse1, long traverse2,
                             int repetition) {

        // filename.xml: 631/200/100 ms (4 elems, 0 attrs, 78 spaces, 0 chars)
        out.print(uri);
        out.print(": ");
        if (repetition == 1) {
            out.print(parse);
        }
        else {
            out.print(parse);
            out.print('/');
            out.print(repetition);
            out.print('=');
            out.print(parse/repetition);
        }
        out.print(';');
        out.print(traverse1);
        out.print(';');
        out.print(traverse2);
        out.print(" ms (");
        out.print(fElements);
        out.print(" elems, ");
        out.print(fAttributes);
        out.print(" attrs, ");
        out.print(fIgnorableWhitespace);
        out.print(" spaces, ");
        out.print(fCharacters);
        out.print(" chars)");
        out.println();
        out.flush();

    // printResults(PrintWriter,String,long,long,long)

    //
    // MAIN
    //

    /** Main program entry point. */
    public static void main(String argv[]) {

        // is there anything to do?
        if (argv.length == 0) {
            printUsage();
            System.exit(1);
        }

        // variables
        Counter counter = new Counter();
        PrintWriter out = new PrintWriter(System.out);
        ParserWrapper parser = null;
        int repetition = DEFAULT_REPETITION;
        boolean namespaces = DEFAULT_NAMESPACES;
        boolean validation = DEFAULT_VALIDATION;
        boolean schemaValidation = DEFAULT_SCHEMA_VALIDATION;
        boolean schemaFullChecking = DEFAULT_SCHEMA_FULL_CHECKING;
        boolean honourAllSchemaLocations = DEFAULT_HONOUR_ALL_SCHEMA_LOCATIONS;
        boolean validateAnnotations = DEFAULT_VALIDATE_ANNOTATIONS;
        boolean dynamicValidation = DEFAULT_DYNAMIC_VALIDATION;
        boolean xincludeProcessing = DEFAULT_XINCLUDE;
        boolean xincludeFixupBaseURIs = DEFAULT_XINCLUDE_FIXUP_BASE_URIS;
        boolean xincludeFixupLanguage = DEFAULT_XINCLUDE_FIXUP_LANGUAGE;

        // process arguments
        for (int i = 0; i < argv.length; i++) {
            String arg = argv[i];
            if (arg.startsWith("-")) {
                String option = arg.substring(1);
                if (option.equals("p")) {
                    // get parser name
                    if (++i == argv.length) {
                        System.err.println("error: Missing argument to -p option.");
                    }
                    String parserName = argv[i];

                    // create parser
                    try {
                        parser = (ParserWrapper)Class.forName(parserName).newInstance();
                    }
                    catch (Exception e) {
                        parser = null;
                        System.err.println("error: Unable to instantiate parser ("+parserName+")");
                    }
                    continue;
                }
                if (option.equals("x")) {
                    if (++i == argv.length) {
                        System.err.println("error: Missing argument to -x option.");
                        continue;
                    }
                    String number = argv[i];
                    try {
                        int value = Integer.parseInt(number);
                        if (value < 1) {
                            System.err.println("error: Repetition must be at least 1.");
                            continue;
                        }
                        repetition = value;
                    }
                    catch (NumberFormatException e) {
                        System.err.println("error: invalid number ("+number+").");
                    }
                    continue;
                }
                if (option.equalsIgnoreCase("n")) {
                    namespaces = option.equals("n");
                    continue;
                }
                if (option.equalsIgnoreCase("v")) {
                    validation = option.equals("v");
                    continue;
                }
                if (option.equalsIgnoreCase("s")) {
                    schemaValidation = option.equals("s");
                    continue;
                }
                if (option.equalsIgnoreCase("f")) {
                    schemaFullChecking = option.equals("f");
                    continue;
                }
                if (option.equalsIgnoreCase("hs")) {
                    honourAllSchemaLocations = option.equals("hs");
                    continue;
                }
                if (option.equalsIgnoreCase("va")) {
                    validateAnnotations = option.equals("va");
                    continue;
                }
                if (option.equalsIgnoreCase("dv")) {
                    dynamicValidation = option.equals("dv");
                    continue;
                }
                if (option.equalsIgnoreCase("xi")) {
                    xincludeProcessing = option.equals("xi");
                    continue;
                }
                if (option.equalsIgnoreCase("xb")) {
                    xincludeFixupBaseURIs = option.equals("xb");
                    continue;
                }
                if (option.equalsIgnoreCase("xl")) {
                    xincludeFixupLanguage = option.equals("xl");
                    continue;
                }
                if (option.equals("h")) {
                    printUsage();
                    continue;
                }
            }

            // use default parser?
            if (parser == null) {

                // create parser
                try {
                    parser = (ParserWrapper)Class.forName(DEFAULT_PARSER_NAME).newInstance();
                }
                catch (Exception e) {
                    System.err.println("error: Unable to instantiate parser ("+DEFAULT_PARSER_NAME+")");
                    continue;
                }
            }

            // set parser features
            try {
                parser.setFeature(NAMESPACES_FEATURE_ID, namespaces);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+NAMESPACES_FEATURE_ID+")");
            }
            try {
                parser.setFeature(VALIDATION_FEATURE_ID, validation);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+VALIDATION_FEATURE_ID+")");
            }
            try {
                parser.setFeature(SCHEMA_VALIDATION_FEATURE_ID, schemaValidation);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+SCHEMA_VALIDATION_FEATURE_ID+")");
            }
            try {
                parser.setFeature(SCHEMA_FULL_CHECKING_FEATURE_ID, schemaFullChecking);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+SCHEMA_FULL_CHECKING_FEATURE_ID+")");
            }
            try {
                parser.setFeature(HONOUR_ALL_SCHEMA_LOCATIONS_ID, honourAllSchemaLocations);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+HONOUR_ALL_SCHEMA_LOCATIONS_ID+")");
            }
            try {
                parser.setFeature(VALIDATE_ANNOTATIONS_ID, validateAnnotations);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+VALIDATE_ANNOTATIONS_ID+")");
            }
            try {
                parser.setFeature(DYNAMIC_VALIDATION_FEATURE_ID, dynamicValidation);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+DYNAMIC_VALIDATION_FEATURE_ID+")");
            }
            try {
                parser.setFeature(XINCLUDE_FEATURE_ID, xincludeProcessing);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+XINCLUDE_FEATURE_ID+")");
            }
            try {
                parser.setFeature(XINCLUDE_FIXUP_BASE_URIS_FEATURE_ID, xincludeFixupBaseURIs);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+XINCLUDE_FIXUP_BASE_URIS_FEATURE_ID+")");
            }
            try {
                parser.setFeature(XINCLUDE_FIXUP_LANGUAGE_FEATURE_ID, xincludeFixupLanguage);
            }
            catch (SAXException e) {
                System.err.println("warning: Parser does not support feature ("+XINCLUDE_FIXUP_LANGUAGE_FEATURE_ID+")");
            }

            // parse file
            try {
                long beforeParse = System.currentTimeMillis();
                Document document = null;
                for (int j = 0; j < repetition; j++) {
                    document = parser.parse(arg);
                }
                long afterParse = System.currentTimeMillis();
                long parse = afterParse - beforeParse;

                ParserWrapper.DocumentInfo documentInfo = parser.getDocumentInfo();
                counter.setDocumentInfo(documentInfo);

                long beforeTraverse1 = System.currentTimeMillis();
                counter.count(document);
                long afterTraverse1 = System.currentTimeMillis();
                long traverse1 = afterTraverse1 - beforeTraverse1;

                long beforeTraverse2 = System.currentTimeMillis();
                counter.count(document);
                long afterTraverse2 = System.currentTimeMillis();
                long traverse2 = afterTraverse2 - beforeTraverse2;
                counter.printResults(out, arg, parse, traverse1, traverse2,
                                     repetition);
            }
            catch (SAXParseException e) {
                // ignore
            }
            catch (Exception e) {
                System.err.println("error: Parse error occurred - "+e.getMessage());
                Exception se = e;
                if (instanceof SAXException) {
                    se = ((SAXException)e).getException();
                }
                if (se != null)
                  se.printStackTrace(System.err);
                else
                  e.printStackTrace(System.err);
            }
        }

    // main(String[])

    //
    // Private static methods
    //

    /** Prints the usage. */
    private static void printUsage() {

        System.err.println("usage: java dom.Counter (options) uri ...");
        System.err.println();

        System.err.println("options:");
        System.err.println("  -p name     Select parser by name.");
        System.err.println("  -x number   Select number of repetitions.");
        System.err.println("  -n  | -N    Turn on/off namespace processing.");
        System.err.println("  -v  | -V    Turn on/off validation.");
        System.err.println("  -s  | -S    Turn on/off Schema validation support.");
        System.err.println("              NOTE: Not supported by all parsers.");
        System.err.println("  -f  | -F    Turn on/off Schema full checking.");
        System.err.println("              NOTE: Requires use of -s and not supported by all parsers.");
        System.err.println("  -hs | -HS   Turn on/off honouring of all schema locations.");
        System.err.println("              NOTE: Requires use of -s and not supported by all parsers.");
        System.err.println("  -va | -VA   Turn on/off validation of schema annotations.");
        System.err.println("              NOTE: Requires use of -s and not supported by all parsers.");
        System.err.println("  -dv | -DV   Turn on/off dynamic validation.");
        System.err.println("              NOTE: Not supported by all parsers.");
        System.err.println("  -xi | -XI   Turn on/off XInclude processing.");
        System.err.println("              NOTE: Not supported by all parsers.");
        System.err.println("  -xb | -XB   Turn on/off base URI fixup during XInclude processing.");
        System.err.println("              NOTE: Requires use of -xi and not supported by all parsers.");
        System.err.println("  -xl | -XL   Turn on/off language fixup during XInclude processing.");
        System.err.println("              NOTE: Requires use of -xi and not supported by all parsers.");
        System.err.println("  -h          This help screen.");
        System.err.println();

        System.err.println("defaults:");
        System.err.println("  Parser:     "+DEFAULT_PARSER_NAME);
        System.err.println("  Repetition: "+DEFAULT_REPETITION);
        System.err.print("  Namespaces: ");
        System.err.println(DEFAULT_NAMESPACES ? "on" "off");
        System.err.print("  Validation: ");
        System.err.println(DEFAULT_VALIDATION ? "on" "off");
        System.err.print("  Schema:     ");
        System.err.println(DEFAULT_SCHEMA_VALIDATION ? "on" "off");
        System.err.print("  Schema full checking:            ");
        System.err.println(DEFAULT_SCHEMA_FULL_CHECKING ? "on" "off");
        System.err.print("  Honour all schema locations:     ");
        System.err.println(DEFAULT_HONOUR_ALL_SCHEMA_LOCATIONS ? "on" "off");
        System.err.print("  Validate annotations:            ");
        System.err.println(DEFAULT_VALIDATE_ANNOTATIONS ? "on" "off");
        System.err.print("  Dynamic:    ");
        System.err.println(DEFAULT_DYNAMIC_VALIDATION ? "on" "off");
        System.err.print("  XInclude:   ");
        System.err.println(DEFAULT_XINCLUDE ? "on" "off");
        System.err.print("  XInclude base URI fixup:  ");
        System.err.println(DEFAULT_XINCLUDE_FIXUP_BASE_URIS ? "on" "off");
        System.err.print("  XInclude language fixup:  ");
        System.err.println(DEFAULT_XINCLUDE_FIXUP_LANGUAGE ? "on" "off");

    // printUsage()

// class DOMCount


/**
 * Encapsulates a DOM parser.
 *
 @version $Id: ParserWrapper.java 447683 2006-09-19 02:36:31Z mrglavas $
 */
 interface ParserWrapper {

    //
    // ParserWrapper methods
    //

    /** Parses the specified URI and returns the document. */
    public Document parse(String urithrows Exception;

    /**
     * Set the state of a feature.
     *
     * Set the state of any feature in a SAX2 parser.  The parser
     * might not recognize the feature, and if it does recognize
     * it, it might not be able to fulfill the request.
     *
     @param featureId The unique identifier (URI) of the feature.
     @param state The requested state of the feature (true or false).
     *
     @exception org.xml.sax.SAXNotRecognizedException If the
     *            requested feature is not known.
     @exception org.xml.sax.SAXNotSupportedException If the
     *            requested feature is known, but the requested
     *            state is not supported.
     @exception org.xml.sax.SAXException If there is any other
     *            problem fulfilling the request.
     */
    public void setFeature(String featureId, boolean state)
        throws  SAXNotRecognizedException, SAXNotSupportedException; 

    /** Returns the document information. */
    public DocumentInfo getDocumentInfo();

    //
    // Interfaces
    //

    /**
     * This interface is here to query information about the document
     * implementation returned by the <code>ParserWrapper#parse</code>
     * method.
     *
     @author Andy Clark, IBM
     */
    public interface DocumentInfo {

        //
        // DocumentInfo methods
        //

        /** 
         * Returns true if the specified text node is ignorable whitespace. 
         */
        public boolean isIgnorableWhitespace(Text text);

    // interface DocumentInfo

// interface ParserWrapper

   
    
    
  
Related examples in the same category
1. Creating a new DOM tree
2. Create new DOM tree with fully qualified element names
3. Traverse the DOM tree as a list
4. Traverse the DOM tree using TreeWalker
5. Reading a DOM tree from XML document
6. Copying a Subtree of Nodes in a DOM Document
7. Copying a Subtree of Nodes from One DOM Document to Another
8. Saving a DOM tree to XML file javax.xml.parsers (JAXP)
9. Using ranges in DOM tree
10. Accessing different types of DOM tree nodes
11. Manipulate w3c DOM trees
12. Returns an iterator over the children of the given element with the given tag name
13. Gets the child of the specified element having the specified name. If the child with this name doesn't exist then null is returned instead.
14. Gets the child of the specified element having the specified unique name
15. Get this Document's root node
16. Returns the concatenated child text of the specified node.
17. Get the first child of the specified type.
18. Get the first child's content ( ie it's included TEXT node ).
19. Get the first direct child with a given type
20. Print Tree node
21. DOM Util: get Child Text
22. Search earlier siblings for a given node
23. Search for a named child of a given node
24. Search our next siblings for a given node
25. Search up the tree for a given node
26. Return the next sibling with a given name and type
27. Get Child Content
28. Traverse a DOM tree in order to print a document that is parsed.
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