/* * DataSourceRegistry.java * * Created on May 4, 2007, 6:27 AM * * To change this template, choose Tools | Template Manager * and open the template in the editor. */ package org.autoplot.datasource; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.net.URL; import java.net.URLClassLoader; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Enumeration; import java.util.HashMap; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import java.util.logging.Level; import java.util.logging.Logger; import org.autoplot.aggregator.AggregatingDataSourceFactory; /** * * @author jbf */ public class DataSourceRegistry { private static final Logger logger= Logger.getLogger("apdss.uri"); private static DataSourceRegistry instance; HashMap dataSourcesByExt; HashMap dataSourcesByMime; HashMap dataSourceFormatByExt; HashMap dataSourceFormatEditorByExt; HashMap dataSourceEditorByExt; HashMap extToDescription; /** Creates a new instance of DataSourceRegistry */ private DataSourceRegistry() { dataSourcesByExt = new HashMap(); dataSourcesByMime = new HashMap(); dataSourceFormatByExt= new HashMap(); dataSourceEditorByExt= new HashMap(); dataSourceFormatEditorByExt= new HashMap(); extToDescription= new HashMap(); } /** * get the single instance of this class. * @return the single instance of this class. */ public static DataSourceRegistry getInstance() { if (instance == null) { instance = new DataSourceRegistry(); } return instance; } /** * get an instance of a class given the class name. * @param o the class name, e.g. org.autoplot.netCDF.HDF5DataSourceFormatEditorPanel * @return an instance of the class. */ public static Object getInstanceFromClassName( String o ) { try { Class clas = Class.forName((String) o); Constructor constructor = clas.getDeclaredConstructor(new Class[]{}); Object result = constructor.newInstance(new Object[]{}); return result; } catch ( Exception e ) { logger.log( Level.SEVERE, e.getMessage(), e ); return null; } } /** * return a list of registered extensions the can format. These will contain the dot prefix. * @return a list of registered extensions. */ public List getFormatterExtensions() { List result= new ArrayList(); for ( Object k: dataSourceFormatByExt.keySet() ) { result.add( (String)k ); } return result; } /** * return a list of registered extensions. These will contain the dot prefix. * @return a list of registered extensions. */ public List getSourceExtensions() { List result= new ArrayList(); for ( Object k: dataSourcesByExt.keySet() ) { result.add( (String)k ); } return result; } /** * return a list of registered extensions. These will contain the dot prefix. * @return a list of registered extensions. */ public List getSourceEditorExtensions() { List result= new ArrayList(); for ( Object k: dataSourceEditorByExt.keySet() ) { result.add( (String)k ); } return result; } /** * look for META-INF/org.autoplot.datasource.DataSourceFactory, create the * factory, then query for its extensions. This is the orginal method * and is not used. */ protected void discoverFactories() { DataSourceRegistry registry= this; // discover Factories on the path try { ClassLoader loader = DataSetURI.class.getClassLoader(); Enumeration urls; if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceFactory"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceFactory"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { if (s.trim().length() > 0) { List extensions = null; List mimeTypes = null; String factoryClassName = s; try { Class c = Class.forName(factoryClassName); DataSourceFactory f = (DataSourceFactory) c.newInstance(); try { Method m = c.getMethod("extensions", new Class[0]); extensions = (List) m.invoke(f, new Object[0]); } catch (NoSuchMethodException ex) { } catch (InvocationTargetException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } try { Method m = c.getMethod("mimeTypes", new Class[0]); mimeTypes = (List) m.invoke(f, new Object[0]); } catch (NoSuchMethodException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } catch (InvocationTargetException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } } catch (ClassNotFoundException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } catch (InstantiationException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } catch (IllegalAccessException ex) { logger.log( Level.SEVERE, ex.getMessage(), ex ); } if (extensions != null) { for (String e : extensions) { registry.registerExtension(factoryClassName, e, null); } } if (mimeTypes != null) { for (String m : mimeTypes) { registry.registerMimeType(factoryClassName, m); } } } s = reader.readLine(); } reader.close(); } } catch (IOException e) { logger.log( Level.SEVERE, e.getMessage(), e ); } } /** * returns a list of something to class, which is dependent on the client * @param urls * @return */ private Map readStuff( Iterator urls ) throws IOException { Map result= new LinkedHashMap(); while (urls.hasNext()) { URL url = urls.next(); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { result.put( ss[i], ss[0] ); } } s = reader.readLine(); } reader.close(); } return result; } /** * look for META-INF/org.autoplot.datasource.DataSourceFactory.extensions */ protected void discoverRegistryEntries() { logger.fine("discoverRegistryEntries"); DataSourceRegistry registry= this; try { ClassLoader loader = DataSetURI.class.getClassLoader(); Enumeration urls; if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceFactory.extensions"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceFactory.extensions"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); logger.log(Level.FINE, "loading {0}", url); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { if ( ss[i].contains(".") ) { logger.warning("META-INF/org.autoplot.datasource.DataSourceFactory.extensions contains extension that contains period: "); logger.warning( ss[0] + " " + ss[i] + " in " + url); logger.warning("This sometimes happens when extension files are concatenated, so check that all are terminated by end-of-line"); logger.warning(""); throw new IllegalArgumentException("DataSourceFactory.extensions contains extension that contains period: "+url ); } registry.registerExtension(ss[0], ss[i], null); } } s = reader.readLine(); } reader.close(); } if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceFactory.mimeTypes"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceFactory.mimeTypes"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); logger.log(Level.FINE, "loading {0}", url); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { registry.registerMimeType(ss[0], ss[i]); } } s = reader.readLine(); } reader.close(); } if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceFormat.extensions"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceFormat.extensions"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); logger.log(Level.FINE, "loading {0}", url); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { if ( ss[i].contains(".") ) { logger.warning("META-INF/org.autoplot.datasource.DataSourceFormat.extensions contains extension that contains period: "); logger.warning( ss[0] + " " + ss[i] + " in " + url); logger.warning("This sometimes happens when extension files are concatenated, so check that all are terminated by end-of-line"); logger.warning(""); throw new IllegalArgumentException("DataSourceFactory.extensions contains extension that contains period: "+url ); } registry.registerFormatter(ss[0], ss[i]); } } s = reader.readLine(); } reader.close(); } if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceEditorPanel.extensions"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceEditorPanel.extensions"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); logger.log(Level.FINE, "loading {0}", url); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { if ( ss[i].contains(".") ) { logger.warning("META-INF/org.autoplot.datasource.DataSourceEditorPanel.extensions contains extension that contains period: "); logger.log(Level.WARNING, "{0} {1} in {2}", new Object[]{ss[0], ss[i], url}); logger.warning("This sometimes happens when extension files are concatenated, so check that all are terminated by end-of-line"); logger.warning(""); throw new IllegalArgumentException("DataSourceFactory.extensions contains extension that contains period: "+url ); } registry.registerEditor(ss[0], ss[i]); } } s = reader.readLine(); } reader.close(); } if (loader == null) { urls = ClassLoader.getSystemResources("META-INF/org.autoplot.datasource.DataSourceFormatEditorPanel.extensions"); } else { urls = loader.getResources("META-INF/org.autoplot.datasource.DataSourceFormatEditorPanel.extensions"); } while (urls.hasMoreElements()) { URL url = urls.nextElement(); logger.log(Level.FINE, "loading {0}", url); BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream())); String s = reader.readLine(); while (s != null) { s = s.trim(); if (s.length() > 0) { String[] ss = s.split("\\s"); for (int i = 1; i < ss.length; i++) { if ( ss[i].contains(".") ) { logger.warning("META-INF/org.autoplot.datasource.DataSourceFormatEditorPanel.extensions contains extension that contains period: "); logger.log(Level.WARNING, "{0} {1} in {2}", new Object[]{ss[0], ss[i], url}); logger.warning("This sometimes happens when extension files are concatenated, so check that all are terminated by end-of-line"); logger.warning(""); throw new IllegalArgumentException("DataSourceFactory.extensions contains extension that contains period: "+url ); } registry.registerFormatEditor(ss[0], ss[i]); } } s = reader.readLine(); } reader.close(); } } catch (IOException e) { logger.log( Level.SEVERE, e.getMessage(), e ); } } /** * Register a data source at runtime, allowing the user to * override the internal extentions. This allows, for example, a new version * of a data source to be compared to the production. * @param ext if non-null, use this extension instead. * @param jarFile the jar file, which must contain META-INF/org.autoplot.datasource.DataSourceFactory.extensions. * @throws IOException */ public void registerDataSourceJar( String ext, final URL jarFile ) throws IOException { URLClassLoader loader= (URLClassLoader) AccessController.doPrivileged(new PrivilegedAction() { @Override public Object run() { URLClassLoader load= new URLClassLoader( new URL[] {jarFile}, DataSourceRegistry.class.getClassLoader() ); return load; } }); Enumeration re= loader.getResources("META-INF/org.autoplot.datasource.DataSourceFactory.extensions"); List rre= new ArrayList(); while ( re.hasMoreElements() ) { URL u= re.nextElement(); if ( u.toString().startsWith( "jar:"+ jarFile.toString() ) ) { rre.add(u); } } Map stuff= readStuff( rre.iterator() ); for ( Entry ent: stuff.entrySet() ) { try { Class clas= loader.loadClass(ent.getValue()); if ( ext!=null ) { this.dataSourcesByExt.put( getExtension(ext), clas.getConstructor().newInstance()); } else { this.dataSourcesByExt.put( getExtension(ent.getKey()), clas.getConstructor().newInstance() ); } } catch ( ClassNotFoundException ex ) { throw new IllegalArgumentException(ex); } catch ( NoSuchMethodException ex ) { throw new IllegalArgumentException(ex); } catch (InstantiationException ex) { throw new IllegalArgumentException( ex); } catch (IllegalAccessException ex) { throw new IllegalArgumentException(ex); } catch (IllegalArgumentException ex) { throw new IllegalArgumentException(ex); } catch (InvocationTargetException ex) { throw new IllegalArgumentException(ex); } } } /** * return true if the source is registered. * @param ext, for example ".cdf" or "cdf" * @return if the source is registered. */ public boolean hasSourceByExt(String ext) { if ( ext==null ) return false; return dataSourcesByExt.get(getExtension(ext))!=null; } /** * return true if the source is registered by mime type. * This is not used much. * @param mime, for example "application/x-das2stream" * @return true if the source is registered by mime type. */ public boolean hasSourceByMime(String mime) { if ( mime==null ) return false; return dataSourcesByMime.get(mime)!=null; } /** * register the data source factory by extension * @param factory the factory (org.autoplot.foo.FooReaderFactory) * @param extension the extension (e.g. ".foo") */ public void register(DataSourceFactory factory, String extension) { extension= getExtension(extension); dataSourcesByExt.put(extension, factory); } /** * register the data source factory by extension and mime * @param factory the factory (org.autoplot.foo.FooReaderFactory) * @param extension the extension (e.g. ".foo") * @param mime the mime type. (e.g. "x-application/foo") */ public void register(DataSourceFactory factory, String extension, String mime) { extension= getExtension(extension); dataSourcesByExt.put(extension, factory); dataSourcesByMime.put(mime.toLowerCase(), factory); } /** * register the data source factory by extension. The name of the * factory class is given, so that the class is not accessed until first * use. * @param className the class name of the factory. (e.g. "org.autoplot.cdf.CdfJavaDataSourceFactory") * @param extension the extension (e.g. "cdf") * @param description a description of the format (e.g. "CDF files using java based reader") */ public void registerExtension(String className, String extension, String description ) { extension= getExtension(extension); Object old= dataSourcesByExt.get(extension); if ( old!=null ) { String oldClassName= ( old instanceof String ) ? (String) old : old.getClass().getName() ; if ( !(oldClassName.equals(className)) ) { logger.log(Level.FINE, "extension {0} is already handled by {1}, replacing with {2}", new Object[]{extension, oldClassName, className}); } } dataSourcesByExt.put(extension, className); if ( description!=null ) extToDescription.put( extension, description ); } /** * register the data source factory by extension. The name of the * factory class is given, so that the class is not accessed until first * use. * @param className the class name of the formatter * @param extension the extension (e.g. "cdf") */ public void registerFormatter(String className, String extension) { if (extension.indexOf('.') != 0) extension= "."+extension; dataSourceFormatByExt.put(extension, className); } /** * register the data source editor by extension. * @param className the class name of the editor (e.g. "org.autoplot.cdf.CdfDataSourceEditorPanel") * @param extension the extension (e.g. "cdf") */ public void registerEditor( String className, String extension ) { extension= getExtension(extension); dataSourceEditorByExt.put(extension, className); } /** * register the data source format editor by extension. This implements an * editor for formatting. * @param className the class name of the editor (e.g. "org.autoplot.cdf.CdfDataSourceFormatEditorPanel") * @param extension the extension (e.g. "cdf") */ public void registerFormatEditor( String className, String extension ) { extension= getExtension(extension); dataSourceFormatEditorByExt.put(extension, className); } public void registerMimeType(String className, String mimeType) { dataSourcesByMime.put(mimeType, className); } /** * register the data source factory by extension and mime * @param className the class name of the factory. (e.g. "org.autoplot.cdf.CdfJavaDataSourceFactory") * @param extension the extension (e.g. "cdf") * @param mime for example "application/x-das2stream" */ public void register(String className, String extension, String mime) { extension= getExtension(extension); dataSourcesByExt.put(extension, className); dataSourcesByMime.put(mime.toLowerCase(), className); } private DataSourceFactory useJavaCdfForNative( String extension, Error ex ) { logger.fine("attempting to use java based reader to handle cdfn."); DataSourceFactory dsf= getSource(".cdfj"); if ( dsf!=null ) { dataSourcesByExt.put( extension, dsf ); //TODO: kludge for CDF dataSourceEditorByExt.put( extension, getDataSourceEditorByExt(".cdfj") ); dataSourceFormatByExt.put( extension, getDataSourceFormatEditorByExt(".cdfj") ); return dsf; } else { throw new RuntimeException(ex); } } /** * look up the source by its id. If a filename is provided, then the * filename's extension is used, otherwise ".ext" or "ext" are accepted. * * @param extension the extension, (e.g. ".cdf" or "/tmp/myfile.cdf") * @return the DataSourceFactory which will create the reader. */ public synchronized DataSourceFactory getSource(String extension) { if ( extension==null ) return null; extension= getExtension(extension); Object o = dataSourcesByExt.get(extension); if (o == null) { return null; } DataSourceFactory result; if (o instanceof String) { try { if ( ((String)o).endsWith("DataSource") ) { throw new IllegalArgumentException("DataSourceFactory names cannot end in DataSource: "+o); } Class clas = Class.forName((String) o); Constructor constructor = clas.getDeclaredConstructor(new Class[]{}); result = (DataSourceFactory) constructor.newInstance(new Object[]{}); dataSourcesByExt.put( extension, result ); // always use the same factory object. } catch (ClassNotFoundException ex) { throw new RuntimeException(ex); } catch (NoSuchMethodException ex) { throw new RuntimeException(ex); } catch (InstantiationException ex) { throw new RuntimeException(ex); } catch (IllegalAccessException ex) { throw new RuntimeException(ex); } catch ( NoClassDefFoundError ex ) { if ( extension.equals(".cdfn") || extension.equals(".cdf") ) { result= useJavaCdfForNative(extension,ex); } else { throw new RuntimeException(ex); } } catch ( UnsatisfiedLinkError ex ) { // kludge in support to fall back to Java reader if the C-based one is not found. if ( extension.equals(".cdfn") || extension.equals(".cdf") ) { result= useJavaCdfForNative(extension,ex); } else { throw new RuntimeException(ex); } } catch (Exception ex) { throw new RuntimeException(ex); } } else { result = (DataSourceFactory) o; } return result; } /** * returns canonical extension for name by: *
    *
  • add a dot when it's not there. *
  • clip off the filename part if it's there. *
  • force to lower case. *
* @param name, such as "http://autoplot.org/data/autoplot.gif" * @return extension, such as ".gif" */ protected static String getExtension( String name ) { if (name.indexOf('.') == -1 ) name= "."+name; if ( name.indexOf('.') > 0 ) { int i= name.lastIndexOf('.'); name= name.substring(i); } int i=name.indexOf('?'); if ( i!=-1 ) { name = name.substring(0,i ); } i=name.indexOf('&'); // this is a whoops, they meant ? if ( i!=-1 ) { name = name.substring(0,i ); } name= name.toLowerCase(); return name; } /** * return the formatter based on the extension. * @param extension the extension, e.g. .cdf * @return the formatter found for this extension. */ public DataSourceFormat getFormatByExt( String extension ) { if ( extension==null ) return null; extension= getExtension(extension); Object o = dataSourceFormatByExt.get(extension); if (o == null) { return null; } DataSourceFormat result; if (o instanceof String) { try { Class clas = Class.forName((String) o); Constructor constructor = clas.getDeclaredConstructor(new Class[]{}); Object oresult= constructor.newInstance(new Object[]{}); if ( oresult instanceof DataSourceFormat ) { result = (DataSourceFormat) constructor.newInstance(new Object[]{}); logger.log(Level.FINE, "constructor for getFormat: {0}", clas); } else { logger.log(Level.WARNING, "constructor of incorrect type for {0}, extension {1}", new Object[]{o, extension}); return null; } } catch (Exception ex) { throw new RuntimeException(ex); } } else { result = (DataSourceFormat) o; } return result; } public synchronized DataSourceFactory getSourceByMime(String mime) { if ( mime==null ) return null; Object o = dataSourcesByMime.get(mime.toLowerCase()); if (o == null) { return null; } DataSourceFactory result; if (o instanceof String) { try { Class clas = Class.forName((String) o); Constructor constructor = clas.getDeclaredConstructor(new Class[]{}); result = (DataSourceFactory) constructor.newInstance(new Object[]{}); dataSourcesByMime.put( mime.toLowerCase(), result ); } catch (ClassNotFoundException ex) { throw new RuntimeException(ex); } catch (NoSuchMethodException ex) { throw new RuntimeException(ex); } catch (InstantiationException ex) { throw new RuntimeException(ex); } catch (IllegalAccessException ex) { throw new RuntimeException(ex); } catch (Exception ex) { throw new RuntimeException(ex); } } else { result = (DataSourceFactory) o; } return result; } /** * returns a String of DataSourceEditor for the extention. This should be * used via DataSourceEditorPanelUtil. (This is introduced to remove the * dependence on the swing library for clients that don't wish to use swing.) * @param ext * @return */ public synchronized Object getDataSourceEditorByExt( String ext ) { return this.dataSourceEditorByExt.get(getExtension(ext)); } public synchronized Object getDataSourceFormatEditorByExt( String ext ) { return this.dataSourceFormatEditorByExt.get(getExtension(ext)); } /** * return the extension for the factory. * @param factory * @return */ String getExtensionFor(DataSourceFactory factory) { for ( Entry ent: this.dataSourcesByExt.entrySet() ) { String key= ent.getKey(); if ( ent.getValue()==factory ) return key; } return null; } public static String getPluginsText() { StringBuilder buf = new StringBuilder(); buf.append(""); { buf.append("

Plugins by Extension:

"); Map m = DataSourceRegistry.getInstance().dataSourcesByExt; Set> ss1= m.entrySet(); List> ss= new ArrayList(ss1); Collections.sort( ss, new Comparator() { @Override public int compare(Object o1, Object o2) { Entry s1= (Entry)o1; Entry s2= (Entry)o2; return s1.getKey().compareTo(s2.getKey()); } }); for ( Entry e: ss ) { String k= e.getKey(); buf.append("").append(k).append(": ").append(e.getValue()).append("
"); } } { buf.append("

Plugins by Mime Type:

"); Map m = DataSourceRegistry.getInstance().dataSourcesByMime; for ( Entry e: m.entrySet() ) { String k= e.getKey(); buf.append("").append(k).append(": ").append(e.getValue()).append("
"); } } buf.append(""); return buf.toString(); } public static List getPlugins() { List result= new ArrayList(); Map m = DataSourceRegistry.getInstance().dataSourcesByExt; for ( Entry e : m.entrySet() ) { String k = e.getKey(); result.add( new CompletionContext( CompletionContext.CONTEXT_AUTOPLOT_SCHEME, "vap+"+k.substring(1)+":" ) ); } return result; } /** * return a description of the data source, if available. * TODO: in the export data gui, there's a bunch of these coded by hand. * @param vapext * @return */ public static String getDescriptionFor(String vapext) { if ( vapext.startsWith("vap+cdaweb") ) { return "CDAWeb database at NASA/SPDF"; } else if ( vapext.startsWith("vap+das2server") ) { return "Das2Server"; } else if ( vapext.startsWith("vap+inline") ) { return "Data encoded within the URI"; } else { return null; } } /** * returns true if the vap scheme requires a resource URL. For example, * vap+cdf: needs a resource URI (the file) but vap+inline doesn't. * @param vapScheme the scheme part of the Autoplot URI, or a URI. * @return true if the vapScheme needs a URL. */ public boolean hasResourceUri(String vapScheme) { int i= vapScheme.indexOf(':'); if ( i>0 ) vapScheme= vapScheme.substring(0,i); boolean noUri= vapScheme.endsWith("cdaweb") || vapScheme.endsWith("inline" ) || vapScheme.endsWith("pdsppi"); return !noUri; } /** * returns true if the vap scheme is known to require an order to the * parameters. This was introduced to support makeCanonical, which would * like to sort the URI parameters so the order does not matter, but then * you cannot do this operation with vap+inline which is essentially a * program where the order matters. * * @param vapScheme, like "vap+cdf:" or "vap+internal:", or entire URI. * @return true if the order of parameters matters. */ public boolean hasParamOrder( String vapScheme) { if ( vapScheme.startsWith("vap+inline:") ) { return true; } else if ( vapScheme.startsWith("vap+internal:") ) { return true; } else { return false; } } /** * return a description of the data source. * @param f the factory * @param uri the uri * @return "aggregation" or "cdf" etc. */ String describe(DataSourceFactory f,String uri) { if ( f instanceof AggregatingDataSourceFactory ) { return "aggregation"; } else { String ext= getExtension(uri); String s= extToDescription.get( ext ); if ( s!=null ) { return s; } else { return ext; } } } }