Examples of org.apache.excalibur.source.Source

org.apache.excalibur.source.Source
This interface provides a simple interface for accessing a source of data.
When the Source object is no longer needed it must be released using the {@link SourceResolver}. This is very similar to looking up components from a ServiceSelector. In fact a source object can implement most lifecycle interfaces like Composable, Initializable, Disposable etc.
The data content can be constant or change over time. Using the {@link #getInputStream()} method you get always the up-to-date content.
If you want to track changes of the source object, this interface offers you some support for it by providing a SourceValidity object.
How does the caching work? The first time you get a Source object, you simply ask it for it's content via getInputStream() and then get the validity object by invoking getValidity. (Further calls to getValidity always return the same object! This is not updated!) The caching algorithm can now store this validity object together with the system identifier of the source. The next time, the caching algorithm wants to check if the cached content is still valid. It has a validity object already to check against.
If it is still the same Source than the first time, you have to call refresh() in order to discard the stored validity in the Source object. If it is a new Source object, calling refresh() should do no harm. After that an up-to-date validity object can retrieved by calling getValidity(). This can be used to test if the content is still valid as discribed in the source validity documentation. If the content is still valid, the cache knows what to do, if not, the new content can be get using getInputStream(). So either after a call to getValidity() or the getInputStream the validity object must be the same until refresh is called! @author Avalon Development Team @version CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:26 $

        String publicationId = url.substring(0, slashIndex);
        url = url.substring(publicationId.length());


        SourceResolver resolver = null;
        Policy policy = null;
        Source source = null;
        try {
            resolver = (SourceResolver) getManager().lookup(SourceResolver.ROLE);


            String policyUrl = publicationId + "/policies" + url + ".acml";
            getLogger().debug("Policy URL: " + policyUrl);
            source = resolver.resolveURI("cocoon://" + policyUrl);
            Document document = DocumentHelper.readDocument(source.getInputStream());
            policy = new PolicyBuilder(accreditableManager).buildPolicy(document);


        } catch (Exception e) {
            throw new AccessControlException(e);
        } finally {

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    /**
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() throws Exception {
        SourceResolver resolver = null;
        Source contextSource = null;
        File contextDir;
        try {
            resolver = (SourceResolver) getManager().lookup(SourceResolver.ROLE);
            contextSource = resolver.resolveURI("context:///");
            contextDir = SourceUtil.getFile(contextSource);

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            if (configurationDirectoryPath == null) {
                throw new AccessControlException("Configuration directory not set!");
            }


            Source source = null;
            SourceResolver resolver = null;
            File directory;
            try {


                getLogger().debug(
                        "Configuration directory Path: [" + configurationDirectoryPath + "]");


                resolver = (SourceResolver) getManager().lookup(SourceResolver.ROLE);
                source = resolver.resolveURI(configurationDirectoryPath);


                getLogger().debug("Configuration directory URI: " + source.getURI());
                directory = new File(new URI(NetUtils.encodePath(source.getURI())));
            } catch (Exception e) {
                throw new AccessControlException(e);
            } finally {
                if (resolver != null) {
                    if (source != null) {

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        Map objectModel,
        String source,
        Parameters params)
        throws IOException, SAXException, ProcessingException, ServiceException {
        // Get absolute path of sitemap directory
        Source input_source = resolver.resolveURI("");
        String sitemapPath = input_source.getURI();
        sitemapPath = sitemapPath.substring(5); // Remove "file:" protocol
        getLogger().debug(".act(): Absolute Sitemap Directory: " + sitemapPath);
        getLogger().debug(".act(): Absolute XML Root Directory: " + sitemapPath + xmlRoot);
        getLogger().debug(".act(): Absolute XSL Root Directory: " + sitemapPath + xslRoot);
        getLogger().debug(".act(): Absolute XSD Root Directory: " + sitemapPath + xsdRoot);

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     */
    public File getPoliciesDirectory() throws AccessControlException {


        if (policiesDirectory == null) {
            SourceResolver resolver = null;
            Source source = null;
            File directory;


            try {
                resolver = (SourceResolver) getServiceManager().lookup(SourceResolver.ROLE);
                source = resolver.resolveURI(policiesDirectoryUri);
                getLogger().debug("Policies directory source: [" + source.getURI() + "]");
                directory = new File(new URI(NetUtils.encodePath(source.getURI())));
            } catch (final Exception e) {
                throw new AccessControlException("Resolving policies directory failed: ", e);
            } finally {
                if (resolver != null) {
                    if (source != null) {

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   *  (non-Javadoc)
   * @see org.apache.lenya.cms.cocoon.transformation.AbstractDOMTransformer#transform(org.w3c.dom.Document)
   */
    protected Document transform(Document doc) {
        try {
            Source input_source = this.resolver.resolveURI("");
            String sitemapPath = input_source.getURI();
            getLogger().debug("Absolute SITEMAP Directory: " + sitemapPath);


            String href = this.parameters.getParameter("href", null);


            if (href != null) {

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   */
    protected Publication getPublication(String url) throws AccessControlException {
        getLogger().debug("Building publication");


        Publication publication;
        Source source = null;
        SourceResolver resolver = null;


        try {
            resolver = (SourceResolver) serviceManager.lookup(SourceResolver.ROLE);
            source = resolver.resolveURI("context:///");

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     * @throws BuildException if an error occurs.
     */
    protected Object buildObject(String sourceUri, InputStreamBuilder builder)
        throws MalformedURLException, IOException, SourceNotFoundException, BuildException {
        Object value = null;
        Source source = null;
        try {
            source = getResolver().resolveURI(sourceUri);
            if (source.exists()) {
                InputStream stream = source.getInputStream();
                value = builder.build(stream);
            }
        } finally {
            if (source != null) {
                getResolver().release(source);

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     * @throws IOException when an error occurs.
     */
    protected SourceValidity getSourceValidity(String sourceUri)
        throws MalformedURLException, IOException {
        SourceValidity sourceValidity;
        Source source = null;
        try {
            source = getResolver().resolveURI(sourceUri);
            sourceValidity = source.getValidity();
        } finally {
            if (source != null) {
                getResolver().release(source);
            }
        }

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     * @throws MalformedURLException when something went wrong.
     * @throws IOException when something went wrong.
     */
    public static String generateKey(SourceResolver resolver, String webappUrl)
        throws MalformedURLException, IOException {
        Source source = null;
        String key;
        try {
            source = resolver.resolveURI("context:///");
            key = source.getURI() + "_" + webappUrl;
        }
        finally {
            if (source != null) {
                resolver.release(source);
            }

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