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 $

            // New syntax: Element user-config contains URL
            configUrl = conf.getChild("user-config").getValue(null);
        }
        
        if (configUrl != null) {
            Source configSource = null;
            SourceResolver resolver = null;
            try {
                resolver = (SourceResolver)this.manager.lookup(SourceResolver.ROLE);
                configSource = resolver.resolveURI(configUrl);
                if (getLogger().isDebugEnabled()) {
                    getLogger().debug("Loading configuration from " + configSource.getURI());
                }
                SourceUtil.toSAX(configSource, new ConfigurationParser());
            } catch (Exception e) {
                getLogger().warn("Cannot load configuration from " + configUrl);
                throw new ConfigurationException("Cannot load configuration from " + configUrl, e);

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            try {
                if (this.getLogger().isDebugEnabled()) {
                    this.getLogger().debug("start invoking auth resource");
                }
                Source source = null;
                try {
                    source = org.apache.cocoon.components.source.SourceUtil.getSource(authenticationResourceName, 
                                                                                      null, 
                                                                                      parameters, 
                                                                                      this.resolver);

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                                                   appHandler.getHandler().getName(),
                                                   path,
                                                   appHandler.getName());
                DocumentFragment fragment;


                Source source = null;
                try {
                    source = org.apache.cocoon.components.source.SourceUtil.getSource(loadResourceName, 
                                                                                      null, 
                                                                                      parameters, 
                                                                                      this.resolver);

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                // referenced by "src" attribute of "validate" element


                Configuration conf = null;
                Session session = null;
                try {
                    Source resource = this.resolver.resolveURI(source);
                    SAXConfigurationHandler saxBuilder = new SAXConfigurationHandler();
                    resolver.toSAX(resource, saxBuilder);


                    conf = saxBuilder.getConfiguration();
                    session = this.getSessionManager().getSession(true);

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     * Invoke resource
     */
    private void invokeResource(String resource,
                                 SourceParameters parameters)
    throws IOException, ProcessingException, SAXException {
        Source source = null;
        try {
            source = SourceUtil.getSource(resource, 
                                          null, 
                                          parameters, 
                                          this.resolver);

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     * Load XML resource
     */
    private Document loadResource(String resource,
                                   SourceParameters parameters)
    throws IOException, ProcessingException, SAXException {
        Source source = null;
        try {
            source = SourceUtil.getSource(resource, 
                                          null, 
                                          parameters, 
                                          this.resolver);

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                sourceCache = (Map) this.resolverContext.get(CONTEXT_SOURCE_CACHE_KEY);
            } catch (ContextException ignore) {
                throw new org.apache.velocity.exception.ResourceNotFoundException("Runtime Cocoon source cache not specified in resource loader resolver context.");
            }


            Source source = (Source) sourceCache.get(systemId);
            if (source == null) {
                try {
                    SourceResolver resolver = (SourceResolver) this.resolverContext.get(CONTEXT_RESOLVER_KEY);
                    source = resolver.resolveURI(systemId);
                } catch (ContextException ex) {

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            // so we create one without Avalon...
            org.apache.cocoon.serialization.LinkSerializer ls =
                new org.apache.cocoon.serialization.LinkSerializer();
            ls.setOutputStream(this.outputStream);


            Source redirectSource = null;
            try {
                redirectSource = this.resolveURI(newURL);
                this.toSAX(redirectSource, ls);
            } catch (SourceException se) {
                throw new CascadingIOException("SourceException: " + se, se);
            } catch (SAXException se) {
                throw new CascadingIOException("SAXException: " + se, se);
            } catch (ProcessingException pe) {
                throw new CascadingIOException("ProcessingException: " + pe, pe);
            } finally {
                this.release( redirectSource );
            }
        } else {
            Source redirectSource = null;
            try {
                redirectSource = this.resolveURI(newURL);
                InputStream is = redirectSource.getInputStream();
                byte[] buffer = new byte[8192];
                int length = -1;


                while ((length = is.read(buffer)) > -1) {
                    this.outputStream.write(buffer, 0, length);

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            StringBuffer buffer = new StringBuffer();
            buffer.append("CA(")
                  .append(this.rootElement.prefix).append(':')
                  .append(this.rootElement.name).append('<')
                  .append(this.rootElement.namespace).append(">)");
            Source current;
            for (int i = 0; i < this.parts.size(); i++) {
                final Part part = (Part)this.parts.get(i);
                current = part.source;
                if (part.element == null) {
                    buffer.append("P=")
                          .append(part.stripRootElement).append(':')
                          .append(current.getURI()).append(';');
                } else {
                    buffer.append("P=")
                          .append(part.element.prefix).append(':')
                          .append(part.element.name)
                          .append('<').append(part.element.namespace).append(">:")
                          .append(part.stripRootElement).append(':')
                          .append(current.getURI()).append(';');
                }
            }
            return buffer.toString();
        } catch (Exception e) {
            getLogger().error("ContentAggregator: could not generateKey", e);

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     *         component is currently not cacheable.
     */
    public SourceValidity getValidity() {
        try {
            AggregatedValidity v = new AggregatedValidity();
            Source current;
            for (int i = 0; i < this.parts.size(); i++) {
                current = ((Part)this.parts.get(i)).source;
                SourceValidity sv = current.getValidity();
                if (sv == null) {
                    return null;
                } else {
                    v.add(sv);
                }

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