Examples of org.xml.sax.Locator

org.xml.sax.Locator
axproject.org'>http://www.saxproject.org for further information.
If a SAX parser provides location information to the SAX application, it does so by implementing this interface and then passing an instance to the application using the content handler's {@link org.xml.sax.ContentHandler#setDocumentLocator setDocumentLocator} method. The application can use theobject to obtain the location of any other SAX event in the XML source document.

Note that the results returned by the object will be valid only during the scope of each callback method: the application will receive unpredictable results if it attempts to use the locator at any other time, or after parsing completes.

SAX parsers are not required to supply a locator, but they are very strongly encouraged to do so. If the parser supplies a locator, it must do so before reporting any other document events. If no locator has been set by the time the application receives the {@link org.xml.sax.ContentHandler#startDocument startDocument}event, the application should assume that a locator is not available.
@since SAX 1.0 @author David Megginson @version 2.0.1 (sax2r2) @see org.xml.sax.ContentHandler#setDocumentLocator


                dependencyContext.addDependency(content.getDependency());
            }
        } catch (UnsupportedEncodingException uee) {
            // get hold of the current locator
            Locator currentLocator =
                    context.getCurrentLocator();


            // this is a processing error as it will occur before we start
            // reading in the text
            XMLProcessingException se =
                    new XMLProcessingException(
                            "Inclusion failed due to " +
                            "unsupporteddocument character encoding " +
                            characterEncoding, currentLocator, uee);


            uridFetchTransaction.stop(
                MonitoredTransaction.FAILED, url.toExternalForm());


            // report this fatal a error
            target.fatalError(se);


        } catch (IOException ioe) {
            // get hold of the current locator
            Locator currentLocator =
                    context.getCurrentLocator();


            // this is a streaming error as the part of the document might
            // have been included.
            XMLStreamingException se =

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    /**
     * Tests the pushLocator method
     * @throws Exception if an error occurs
     */
    public void testPushLocator() throws Exception {
        Locator l1 = createLocator();
        Locator l2 = createLocator();


        context.pushLocator(l1);
        context.pushLocator(l2);
        
        // ensure that l2 is at the top of the stack

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    /**
     * Tests the popLocator method
     * @throws Exception if an error occurs
     */
    public void testPopLocator() throws Exception {
        Locator l1 = createLocator();
        Locator l2 = createLocator();


        internalLocatorStack.push(l1);
        internalLocatorStack.push(l2);
        
        // ensure items are popped off in the correct order

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    /**
     * Tests the getCurrentBaseURI method
     * @throws Exception if an error occurs 
     */
    public void testGetCurrentBaseURI() throws Exception {
        Locator l1 = createLocator();
        internalLocatorStack.push(l1);


        assertEquals("getCurrentLocator should return Locator at top of stack",
                     l1, context.getCurrentLocator());
    }

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     * Tests the getLocators method.
     * @throws Exception if an error occurs
     */
    public void testGetLocators() throws Exception {
        // create some locators
        Locator l1 = createLocator();
        Locator l2 = createLocator();
        // add the locators to the context
        context.pushLocator(l1);
        context.pushLocator(l2);
        // call getLocators to obtain an iterator
        Iterator i = context.getLocators();

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        String albumName = attributes.getValue(ALBUM_NAME_ATTRIBUTE);
        String albumId = attributes.getValue(ALBUM_ID_ATTRIBUTE);


        if (albumName != null && albumId != null) {
            Locator locator = pipeline.getPipelineContext().getCurrentLocator();
            XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to use both album and album-id attributes",
                                locator);
            getTargetProcess(pipeline).fatalError(e);
            return null;
        }


        if (albumName != null) {
            if (userId == null) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to use album attribute without specifying user-id attribute",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            hrefAttr.append(MessageFormat.format(
                            PICASA_ALBUM_NAME_FRAGMENT, albumName));
        } else if (albumId != null) {
            if (userId == null) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to use album-id attribute without specifying user-id attribute",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            hrefAttr.append(MessageFormat.format(
                            PICASA_ALBUM_ID_FRAGMENT, albumId));
        }


        String photoId = attributes.getValue(PHOTO_ID_ATTRIBUTE);         


        if (photoId != null) {
            if (albumName == null && albumId == null) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to use photo-id attribute without specifying album or album-id attribute",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            hrefAttr.append(MessageFormat.format(
                            PICASA_PHOTO_ID_FRAGMENT, photoId));
        } else {
            queryString.append(PICASA_KIND_PHOTO_FRAGMENT);
        }


        // tags restriction/constraint can be user-, album- or photo-based
        String tags = attributes.getValue(TAGS_ATTRIBUTE);
        if (tags != null) {
            // convert space separated list to comma separated list
            String commaSeparatedTags = tags.trim().replaceAll("\\s+", ",");
            if (!"".equals(queryString)) {
                queryString.append("&");                
            }
            queryString.append(MessageFormat.format(
                            PICASA_TAG_FRAGMENT, commaSeparatedTags));
        } else if (attributes.getValue(QUERY_ATTRIBUTE) != null) {
            if (!"".equals(queryString)) {
                queryString.append("&");
            }
            queryString.append(MessageFormat.format(
                            PICASA_QUERY_FRAGMENT,
                            attributes.getValue(QUERY_ATTRIBUTE)));
        }


        // pagination parameters
        String pageSize = attributes.getValue(PAGE_SIZE_ATTRIBUTE);
        String pageIndex = attributes.getValue(PAGE_INDEX_ATTRIBUTE);    


        if (pageSize != null) {
            Integer pageSizeInt = null;
            try {
                pageSizeInt = Integer.parseInt(pageSize);
            } catch(NumberFormatException nfe) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-size attribute should be of integer value",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
          }


            if (pageSizeInt < 1 || pageSizeInt > 500) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-size attribute value should be in the range of [1,500]",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            pageSize = pageSizeInt.toString(); 
        } else {
            pageSize = DEFAULT_PAGE_SIZE;
        }


        if (!"".equals(queryString)) {
            queryString.append("&");                
        }


        queryString.append(MessageFormat.format(
                PICASA_MAX_RESULTS_FRAGMENT, pageSize));


        if (pageIndex != null) {
            Integer pageIndexInt = null;
            try {
                pageIndexInt = Integer.parseInt(pageIndex);
            } catch(NumberFormatException nfe) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-index attribute should be of integer value",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }


            if (pageIndexInt < 1) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-index attribute value should be in the range of [1,...]",
                                locator);
                getTargetProcess(pipeline).fatalError(e);

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    // javadoc inherited
    public void processAttributes(Attributes attributes) throws SAXException {
        variableName = attributes.getValue("name");
        variableValue = attributes.getValue("value");
        if(variableName == null || variableValue == null) {
            Locator l = getPipelineContext().getCurrentLocator(); 
            fatalError(new ExtendedSAXParseException(
                    "name and value attributes are compulsory", l));                                             
        }
    }

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        String tags = attributes.getValue(TAGS_ATTRIBUTE);
        String query = attributes.getValue(QUERY_ATTRIBUTE);


        if (photosetId != null) {
            if (userId != null || tags != null || query != null) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to use any of the attributes: 'user-id', 'tags', 'query' " +
                                "when photoset-id is specified",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            queryString.append("?").append(FLICKR_API_PHOTOSETS_METHOD);
            queryString.append("&")
                           .append(MessageFormat.format(
                                FLICKR_PHOTOSET_ID_PARAM, photosetId));
        } else {
            queryString.append("?").append(FLICKR_API_PHOTOS_METHOD);


            if (userId != null) {
                queryString.append("&")
                           .append(MessageFormat.format(
                                FLICKR_USER_ID_PARAM, userId));
            } else if (tags == null && query == null) {
                // parameterless queries are not supported
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "at least one of the attributes: 'user-id', 'tags', 'query' should be specified",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }


            if (tags != null && query != null) {
                // in order not to produce misleading results (as flickr ignores tags param
                // when query/text param is set) it is considered invalid attributes
                // combination
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "not allowed to specify both 'tags' and 'query' attributes",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }


            if (tags != null) {
                // convert space separated list to comma separated list
                String commaSeparatedTags = tags.trim().replaceAll("\\s+", ",");
                queryString.append("&")
                           .append(MessageFormat.format(
                               FLICKR_TAGS_PARAM, commaSeparatedTags))
                           .append("&")
                           .append(FLICKR_TAG_MODE_PARAM);
            }


            if (query != null) {
                queryString.append("&")
                           .append(MessageFormat.format(
                               FLICKR_TEXT_PARAM, query));
            }


        }


        if (attributes.getValue(API_KEY_ATTRIBUTE) != null) {
            queryString.append("&")
                       .append(MessageFormat.format(
                            FLICKR_API_KEY_PARAM,
                            attributes.getValue(API_KEY_ATTRIBUTE)));
        } else {
            Locator locator = pipeline.getPipelineContext().getCurrentLocator();
            XMLPipelineException e =
                    new XMLPipelineException(
                            "api-key attribute should be specified",
                            locator);
            getTargetProcess(pipeline).fatalError(e);
            return null;
        }


        queryString.append("&").append(FLICKR_EXTRAS_PARAM);


        // pagination parameters
        String pageSize = attributes.getValue(PAGE_SIZE_ATTRIBUTE);
        String pageIndex = attributes.getValue(PAGE_INDEX_ATTRIBUTE);


        if (pageSize != null) {
            Integer pageSizeInt = null;
            try {
                pageSizeInt = Integer.parseInt(pageSize);
            } catch(NumberFormatException nfe) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-size attribute should be of integer value",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }


            if (pageSizeInt < 1 || pageSizeInt > 500) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-size attribute value should be in the range of [1,500]",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }
            pageSize = pageSizeInt.toString();
        } else {
            pageSize = DEFAULT_PAGE_SIZE;
        }


        queryString.append("&")
                .append(MessageFormat.format(
                    FLICKR_PER_PAGE_PARAM, pageSize));


        if (pageIndex != null) {
            Integer pageIndexInt;
            try {
                pageIndexInt = Integer.parseInt(pageIndex);
            } catch(NumberFormatException nfe) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-index attribute should be of integer value",
                                locator);
                getTargetProcess(pipeline).fatalError(e);
                return null;
            }


            if (pageIndexInt < 1) {
                Locator locator = pipeline.getPipelineContext().getCurrentLocator();
                XMLPipelineException e =
                        new XMLPipelineException(
                                "page-index attribute value should be in the range of [1,...]",
                                locator);
                getTargetProcess(pipeline).fatalError(e);

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     * @return The exception to forward.
     */
    private SAXParseException createException(
            DynamicProcess dynamicProcess, final String message) {
        XMLPipelineContext context = dynamicProcess.getPipelineContext();
        Locator locator = context.getCurrentLocator();
        SAXParseException exception = new XMLPipelineException(message,
                locator);
        return exception;
    }

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            templatesHandler = getTransformerFactory(isCompilable)
                    .newTemplatesHandler();
            setContentHandler(templatesHandler);
            templatesHandler.startDocument();
        } catch (TransformerConfigurationException e) {
            Locator locator = getPipelineContext().getCurrentLocator();
            String message = "Unable to load TemplatesHandler";
            fatalError(new XMLStreamingException(message, locator, e));
        }
    }

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