src/main/java/org/apache/commons/configuration2/resolver/CatalogResolver.java - commons-configuration - Git at Google

 /*
  * 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.
  */
 package org.apache.commons.configuration2.resolver;

 import java.io.IOException;
 import java.io.InputStream;
 import java.net.FileNameMap;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.Vector;

 import org.apache.commons.configuration2.ex.ConfigurationException;
 import org.apache.commons.configuration2.interpol.ConfigurationInterpolator;
 import org.apache.commons.configuration2.io.ConfigurationLogger;
 import org.apache.commons.configuration2.io.FileLocatorUtils;
 import org.apache.commons.configuration2.io.FileSystem;
 import org.apache.xml.resolver.CatalogException;
 import org.apache.xml.resolver.readers.CatalogReader;
 import org.xml.sax.EntityResolver;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;

 /**
  * Thin wrapper around xml commons CatalogResolver to allow list of catalogs to be provided.
  *
  * @since 1.7
  */
 public class CatalogResolver implements EntityResolver {
     /**
      * Overrides the Catalog implementation to use the underlying FileSystem.
      */
     public static class Catalog extends org.apache.xml.resolver.Catalog {
         /** The FileSystem */
         private FileSystem fs;

         /** FileNameMap to determine the mime type */
         private final FileNameMap fileNameMap = URLConnection.getFileNameMap();

         /**
          * Load the catalogs.
          *
          * @throws IOException if an error occurs.
          */
         @Override
         public void loadSystemCatalogs() throws IOException {
             fs = ((CatalogManager) catalogManager).getFileSystem();
             final String base = ((CatalogManager) catalogManager).getBaseDir();

             // This is safe because the catalog manager returns a vector of strings.
             final Vector<String> catalogs = catalogManager.getCatalogFiles();
             if (catalogs != null) {
                 for (int count = 0; count < catalogs.size(); count++) {
                     final String fileName = catalogs.elementAt(count);

                     URL url = null;
                     InputStream inputStream = null;

                     try {
                         url = locate(fs, base, fileName);
                         if (url != null) {
                             inputStream = fs.getInputStream(url);
                         }
                     } catch (final ConfigurationException ce) {
                         final String name = url.toString();
                         // Ignore the exception.
                         catalogManager.debug.message(DEBUG_ALL, "Unable to get input stream for " + name + ". " + ce.getMessage());
                     }
                     if (inputStream != null) {
                         final String mimeType = fileNameMap.getContentTypeFor(fileName);
                         try {
                             if (mimeType != null) {
                                 parseCatalog(mimeType, inputStream);
                                 continue;
                             }
                         } catch (final Exception ex) {
                             // Ignore the exception.
                             catalogManager.debug.message(DEBUG_ALL, "Exception caught parsing input stream for " + fileName + ". " + ex.getMessage());
                         } finally {
                             inputStream.close();
                         }
                     }
                     parseCatalog(base, fileName);
                 }
             }

         }

         /**
          * Performs character normalization on a URI reference.
          *
          * @param uriref The URI reference
          * @return The normalized URI reference.
          */
         @Override
         protected String normalizeURI(final String uriref) {
             final ConfigurationInterpolator ci = ((CatalogManager) catalogManager).getInterpolator();
             final String resolved = ci != null ? String.valueOf(ci.interpolate(uriref)) : uriref;
             return super.normalizeURI(resolved);
         }

         /**
          * Parses the specified catalog file.
          *
          * @param baseDir The base directory, if not included in the file name.
          * @param fileName The catalog file. May be a full URI String.
          * @throws IOException If an error occurs.
          */
         public void parseCatalog(final String baseDir, final String fileName) throws IOException {
             base = locate(fs, baseDir, fileName);
             catalogCwd = base;
             default_override = catalogManager.getPreferPublic();
             catalogManager.debug.message(DEBUG_NORMAL, "Parse catalog: " + fileName);

             boolean parsed = false;

             for (int count = 0; !parsed && count < readerArr.size(); count++) {
                 final CatalogReader reader = (CatalogReader) readerArr.get(count);
                 InputStream inputStream;

                 try {
                     inputStream = fs.getInputStream(base);
                 } catch (final Exception ex) {
                     catalogManager.debug.message(DEBUG_NORMAL, "Unable to access " + base + ex.getMessage());
                     break;
                 }

                 try {
                     reader.readCatalog(this, inputStream);
                     parsed = true;
                 } catch (final CatalogException ce) {
                     catalogManager.debug.message(DEBUG_NORMAL, "Parse failed for " + fileName + ce.getMessage());
                     if (ce.getExceptionType() == CatalogException.PARSE_FAILED) {
                         break;
                     }
                     // try again!
                     continue;
                 } finally {
                     try {
                         inputStream.close();
                     } catch (final IOException ioe) {
                         // Ignore the exception.
                         inputStream = null;
                     }
                 }
             }

             if (parsed) {
                 parsePendingCatalogs();
             }
         }
     }

     /**
      * Extends the CatalogManager to make the FileSystem and base directory accessible.
      */
     public static class CatalogManager extends org.apache.xml.resolver.CatalogManager {
         /** The static catalog used by this manager. */
         private static org.apache.xml.resolver.Catalog staticCatalog;

         /** The FileSystem */
         private FileSystem fs;

         /** The base directory */
         private String baseDir = System.getProperty("user.dir");

         /** The object for handling interpolation. */
         private ConfigurationInterpolator interpolator;

         /**
          * Gets the base directory.
          *
          * @return The base directory.
          */
         public String getBaseDir() {
             return this.baseDir;
         }

         /**
          * Gets a catalog instance.
          *
          * If this manager uses static catalogs, the same static catalog will always be returned. Otherwise a new catalog will
          * be returned.
          *
          * @return The Catalog.
          */
         @Override
         public org.apache.xml.resolver.Catalog getCatalog() {
             return getPrivateCatalog();
         }

         /**
          * Gets the FileSystem.
          *
          * @return The FileSystem.
          */
         public FileSystem getFileSystem() {
             return this.fs;
         }

         /**
          * Gets the ConfigurationInterpolator.
          *
          * @return the ConfigurationInterpolator.
          */
         public ConfigurationInterpolator getInterpolator() {
             return interpolator;
         }

         /**
          * Gets a new catalog instance. This method is only overridden because xml-resolver might be in a parent ClassLoader and
          * will be incapable of loading our Catalog implementation.
          *
          * This method always returns a new instance of the underlying catalog class.
          *
          * @return the Catalog.
          */
         @Override
         public org.apache.xml.resolver.Catalog getPrivateCatalog() {
             org.apache.xml.resolver.Catalog catalog = staticCatalog;

             if (catalog == null || !getUseStaticCatalog()) {
                 try {
                     catalog = new Catalog();
                     catalog.setCatalogManager(this);
                     catalog.setupReaders();
                     catalog.loadSystemCatalogs();
                 } catch (final Exception ex) {
                     ex.printStackTrace();
                 }

                 if (getUseStaticCatalog()) {
                     staticCatalog = catalog;
                 }
             }

             return catalog;
         }

         /**
          * Sets the base directory.
          *
          * @param baseDir The base directory.
          */
         public void setBaseDir(final String baseDir) {
             if (baseDir != null) {
                 this.baseDir = baseDir;
             }
         }

         /**
          * Sets the FileSystem
          *
          * @param fileSystem The FileSystem in use.
          */
         public void setFileSystem(final FileSystem fileSystem) {
             this.fs = fileSystem;
         }

         /**
          * Sets the ConfigurationInterpolator.
          *
          * @param configurationInterpolator the ConfigurationInterpolator.
          */
         public void setInterpolator(final ConfigurationInterpolator configurationInterpolator) {
             interpolator = configurationInterpolator;
         }
     }

     /**
      * Debug everything.
      */
     private static final int DEBUG_ALL = 9;

     /**
      * Normal debug setting.
      */
     private static final int DEBUG_NORMAL = 4;

     /**
      * Debug nothing.
      */
     private static final int DEBUG_NONE = 0;

     /**
      * Locates a given file. This implementation delegates to the corresponding method in {@link FileLocatorUtils}.
      *
      * @param fs the {@code FileSystem}
      * @param basePath the base path
      * @param name the file name
      * @return the URL pointing to the file
      */
     private static URL locate(final FileSystem fs, final String basePath, final String name) {
         return FileLocatorUtils.locate(FileLocatorUtils.fileLocator().fileSystem(fs).basePath(basePath).fileName(name).create());
     }

     /**
      * The CatalogManager
      */
     private final CatalogManager manager = new CatalogManager();

     /**
      * The FileSystem in use.
      */
     private FileSystem fs = FileLocatorUtils.DEFAULT_FILE_SYSTEM;

     /**
      * The CatalogResolver
      */
     private org.apache.xml.resolver.tools.CatalogResolver resolver;

     /**
      * Stores the logger.
      */
     private ConfigurationLogger log;

     /**
      * Constructs the CatalogResolver
      */
     public CatalogResolver() {
         manager.setIgnoreMissingProperties(true);
         manager.setUseStaticCatalog(false);
         manager.setFileSystem(fs);
         initLogger(null);
     }

     /**
      * Gets the logger used by this configuration object.
      *
      * @return the logger
      */
     public ConfigurationLogger getLogger() {
         return log;
     }

     private synchronized org.apache.xml.resolver.tools.CatalogResolver getResolver() {
         if (resolver == null) {
             resolver = new org.apache.xml.resolver.tools.CatalogResolver(manager);
         }
         return resolver;
     }

     /**
      * Initializes the logger. Checks for null parameters.
      *
      * @param log the new logger
      */
     private void initLogger(final ConfigurationLogger log) {
         this.log = log != null ? log : ConfigurationLogger.newDummyLogger();
     }

     /**
      * <p>
      * Implements the {@code resolveEntity} method for the SAX interface.
      * </p>
      * <p>
      * Presented with an optional public identifier and a system identifier, this function attempts to locate a mapping in
      * the catalogs.
      * </p>
      * <p>
      * If such a mapping is found, the resolver attempts to open the mapped value as an InputSource and return it.
      * Exceptions are ignored and null is returned if the mapped value cannot be opened as an input source.
      * </p>
      * <p>
      * If no mapping is found (or an error occurs attempting to open the mapped value as an input source), null is returned
      * and the system will use the specified system identifier as if no entityResolver was specified.
      * </p>
      *
      * @param publicId The public identifier for the entity in question. This may be null.
      * @param systemId The system identifier for the entity in question. XML requires a system identifier on all external
      *        entities, so this value is always specified.
      * @return An InputSource for the mapped identifier, or null.
      * @throws SAXException if an error occurs.
      */
     @SuppressWarnings("resource") // InputSource wraps an InputStream.
     @Override
     public InputSource resolveEntity(final String publicId, final String systemId) throws SAXException {
         String resolved = getResolver().getResolvedEntity(publicId, systemId);

         if (resolved != null) {
             final String badFilePrefix = "file://";
             final String correctFilePrefix = "file:///";

             // Java 5 has a bug when constructing file URLs
             if (resolved.startsWith(badFilePrefix) && !resolved.startsWith(correctFilePrefix)) {
                 resolved = correctFilePrefix + resolved.substring(badFilePrefix.length());
             }

             try {
                 final URL url = locate(fs, null, resolved);
                 if (url == null) {
                     throw new ConfigurationException("Could not locate " + resolved);
                 }
                 final InputStream inputStream = fs.getInputStream(url);
                 final InputSource inputSource = new InputSource(resolved);
                 inputSource.setPublicId(publicId);
                 inputSource.setByteStream(inputStream);
                 return inputSource;
             } catch (final Exception e) {
                 log.warn("Failed to create InputSource for " + resolved, e);
             }
         }

         return null;
     }

     /**
      * Sets the base path.
      *
      * @param baseDir The base path String.
      */
     public void setBaseDir(final String baseDir) {
         manager.setBaseDir(baseDir);
     }

     /**
      * Sets the list of catalog file names
      *
      * @param catalogs The delimited list of catalog files.
      */
     public void setCatalogFiles(final String catalogs) {
         manager.setCatalogFiles(catalogs);
     }

     /**
      * Enables debug logging of xml-commons Catalog processing.
      *
      * @param debug True if debugging should be enabled, false otherwise.
      */
     public void setDebug(final boolean debug) {
         manager.setVerbosity(debug ? DEBUG_ALL : DEBUG_NONE);
     }

     /**
      * Sets the FileSystem.
      *
      * @param fileSystem The FileSystem.
      */
     public void setFileSystem(final FileSystem fileSystem) {
         this.fs = fileSystem;
         manager.setFileSystem(fileSystem);
     }

     /**
      * Sets the {@code ConfigurationInterpolator}.
      *
      * @param ci the {@code ConfigurationInterpolator}
      */
     public void setInterpolator(final ConfigurationInterpolator ci) {
         manager.setInterpolator(ci);
     }

     /**
      * Allows setting the logger to be used by this object. This method makes it possible for clients to exactly control
      * logging behavior. Per default a logger is set that will ignore all log messages. Derived classes that want to enable
      * logging should call this method during their initialization with the logger to be used. Passing in <b>null</b> as
      * argument disables logging.
      *
      * @param log the new logger
      */
     public void setLogger(final ConfigurationLogger log) {
         initLogger(log);
     }
 }
	/*
	* 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.
	*/
	package org.apache.commons.configuration2.resolver;

	import java.io.IOException;
	import java.io.InputStream;
	import java.net.FileNameMap;
	import java.net.URL;
	import java.net.URLConnection;
	import java.util.Vector;

	import org.apache.commons.configuration2.ex.ConfigurationException;
	import org.apache.commons.configuration2.interpol.ConfigurationInterpolator;
	import org.apache.commons.configuration2.io.ConfigurationLogger;
	import org.apache.commons.configuration2.io.FileLocatorUtils;
	import org.apache.commons.configuration2.io.FileSystem;
	import org.apache.xml.resolver.CatalogException;
	import org.apache.xml.resolver.readers.CatalogReader;
	import org.xml.sax.EntityResolver;
	import org.xml.sax.InputSource;
	import org.xml.sax.SAXException;

	/**
	* Thin wrapper around xml commons CatalogResolver to allow list of catalogs to be provided.
	*
	* @since 1.7
	*/
	public class CatalogResolver implements EntityResolver {
	/**
	* Overrides the Catalog implementation to use the underlying FileSystem.
	*/
	public static class Catalog extends org.apache.xml.resolver.Catalog {
	/** The FileSystem */
	private FileSystem fs;

	/** FileNameMap to determine the mime type */
	private final FileNameMap fileNameMap = URLConnection.getFileNameMap();

	/**
	* Load the catalogs.
	*
	* @throws IOException if an error occurs.
	*/
	@Override
	public void loadSystemCatalogs() throws IOException {
	fs = ((CatalogManager) catalogManager).getFileSystem();
	final String base = ((CatalogManager) catalogManager).getBaseDir();

	// This is safe because the catalog manager returns a vector of strings.
	final Vector<String> catalogs = catalogManager.getCatalogFiles();
	if (catalogs != null) {
	for (int count = 0; count < catalogs.size(); count++) {
	final String fileName = catalogs.elementAt(count);

	URL url = null;
	InputStream inputStream = null;

	try {
	url = locate(fs, base, fileName);
	if (url != null) {
	inputStream = fs.getInputStream(url);
	}
	} catch (final ConfigurationException ce) {
	final String name = url.toString();
	// Ignore the exception.
	catalogManager.debug.message(DEBUG_ALL, "Unable to get input stream for " + name + ". " + ce.getMessage());
	}
	if (inputStream != null) {
	final String mimeType = fileNameMap.getContentTypeFor(fileName);
	try {
	if (mimeType != null) {
	parseCatalog(mimeType, inputStream);
	continue;
	}
	} catch (final Exception ex) {
	// Ignore the exception.
	catalogManager.debug.message(DEBUG_ALL, "Exception caught parsing input stream for " + fileName + ". " + ex.getMessage());
	} finally {
	inputStream.close();
	}
	}
	parseCatalog(base, fileName);
	}
	}

	}

	/**
	* Performs character normalization on a URI reference.
	*
	* @param uriref The URI reference
	* @return The normalized URI reference.
	*/
	@Override
	protected String normalizeURI(final String uriref) {
	final ConfigurationInterpolator ci = ((CatalogManager) catalogManager).getInterpolator();
	final String resolved = ci != null ? String.valueOf(ci.interpolate(uriref)) : uriref;
	return super.normalizeURI(resolved);
	}

	/**
	* Parses the specified catalog file.
	*
	* @param baseDir The base directory, if not included in the file name.
	* @param fileName The catalog file. May be a full URI String.
	* @throws IOException If an error occurs.
	*/
	public void parseCatalog(final String baseDir, final String fileName) throws IOException {
	base = locate(fs, baseDir, fileName);
	catalogCwd = base;
	default_override = catalogManager.getPreferPublic();
	catalogManager.debug.message(DEBUG_NORMAL, "Parse catalog: " + fileName);

	boolean parsed = false;

	for (int count = 0; !parsed && count < readerArr.size(); count++) {
	final CatalogReader reader = (CatalogReader) readerArr.get(count);
	InputStream inputStream;

	try {
	inputStream = fs.getInputStream(base);
	} catch (final Exception ex) {
	catalogManager.debug.message(DEBUG_NORMAL, "Unable to access " + base + ex.getMessage());
	break;
	}

	try {
	reader.readCatalog(this, inputStream);
	parsed = true;
	} catch (final CatalogException ce) {
	catalogManager.debug.message(DEBUG_NORMAL, "Parse failed for " + fileName + ce.getMessage());
	if (ce.getExceptionType() == CatalogException.PARSE_FAILED) {
	break;
	}
	// try again!
	continue;
	} finally {
	try {
	inputStream.close();
	} catch (final IOException ioe) {
	// Ignore the exception.
	inputStream = null;
	}
	}
	}

	if (parsed) {
	parsePendingCatalogs();
	}
	}
	}

	/**
	* Extends the CatalogManager to make the FileSystem and base directory accessible.
	*/
	public static class CatalogManager extends org.apache.xml.resolver.CatalogManager {
	/** The static catalog used by this manager. */
	private static org.apache.xml.resolver.Catalog staticCatalog;

	/** The FileSystem */
	private FileSystem fs;

	/** The base directory */
	private String baseDir = System.getProperty("user.dir");

	/** The object for handling interpolation. */
	private ConfigurationInterpolator interpolator;

	/**
	* Gets the base directory.
	*
	* @return The base directory.
	*/
	public String getBaseDir() {
	return this.baseDir;
	}

	/**
	* Gets a catalog instance.
	*
	* If this manager uses static catalogs, the same static catalog will always be returned. Otherwise a new catalog will
	* be returned.
	*
	* @return The Catalog.
	*/
	@Override
	public org.apache.xml.resolver.Catalog getCatalog() {
	return getPrivateCatalog();
	}

	/**
	* Gets the FileSystem.
	*
	* @return The FileSystem.
	*/
	public FileSystem getFileSystem() {
	return this.fs;
	}

	/**
	* Gets the ConfigurationInterpolator.
	*
	* @return the ConfigurationInterpolator.
	*/
	public ConfigurationInterpolator getInterpolator() {
	return interpolator;
	}

	/**
	* Gets a new catalog instance. This method is only overridden because xml-resolver might be in a parent ClassLoader and
	* will be incapable of loading our Catalog implementation.
	*
	* This method always returns a new instance of the underlying catalog class.
	*
	* @return the Catalog.
	*/
	@Override
	public org.apache.xml.resolver.Catalog getPrivateCatalog() {
	org.apache.xml.resolver.Catalog catalog = staticCatalog;

	if (catalog == null \|\| !getUseStaticCatalog()) {
	try {
	catalog = new Catalog();
	catalog.setCatalogManager(this);
	catalog.setupReaders();
	catalog.loadSystemCatalogs();
	} catch (final Exception ex) {
	ex.printStackTrace();
	}

	if (getUseStaticCatalog()) {
	staticCatalog = catalog;
	}
	}

	return catalog;
	}

	/**
	* Sets the base directory.
	*
	* @param baseDir The base directory.
	*/
	public void setBaseDir(final String baseDir) {
	if (baseDir != null) {
	this.baseDir = baseDir;
	}
	}

	/**
	* Sets the FileSystem
	*
	* @param fileSystem The FileSystem in use.
	*/
	public void setFileSystem(final FileSystem fileSystem) {
	this.fs = fileSystem;
	}

	/**
	* Sets the ConfigurationInterpolator.
	*
	* @param configurationInterpolator the ConfigurationInterpolator.
	*/
	public void setInterpolator(final ConfigurationInterpolator configurationInterpolator) {
	interpolator = configurationInterpolator;
	}
	}

	/**
	* Debug everything.
	*/
	private static final int DEBUG_ALL = 9;

	/**
	* Normal debug setting.
	*/
	private static final int DEBUG_NORMAL = 4;

	/**
	* Debug nothing.
	*/
	private static final int DEBUG_NONE = 0;

	/**
	* Locates a given file. This implementation delegates to the corresponding method in {@link FileLocatorUtils}.
	*
	* @param fs the {@code FileSystem}
	* @param basePath the base path
	* @param name the file name
	* @return the URL pointing to the file
	*/
	private static URL locate(final FileSystem fs, final String basePath, final String name) {
	return FileLocatorUtils.locate(FileLocatorUtils.fileLocator().fileSystem(fs).basePath(basePath).fileName(name).create());
	}

	/**
	* The CatalogManager
	*/
	private final CatalogManager manager = new CatalogManager();

	/**
	* The FileSystem in use.
	*/
	private FileSystem fs = FileLocatorUtils.DEFAULT_FILE_SYSTEM;

	/**
	* The CatalogResolver
	*/
	private org.apache.xml.resolver.tools.CatalogResolver resolver;

	/**
	* Stores the logger.
	*/
	private ConfigurationLogger log;

	/**
	* Constructs the CatalogResolver
	*/
	public CatalogResolver() {
	manager.setIgnoreMissingProperties(true);
	manager.setUseStaticCatalog(false);
	manager.setFileSystem(fs);
	initLogger(null);
	}

	/**
	* Gets the logger used by this configuration object.
	*
	* @return the logger
	*/
	public ConfigurationLogger getLogger() {
	return log;
	}

	private synchronized org.apache.xml.resolver.tools.CatalogResolver getResolver() {
	if (resolver == null) {
	resolver = new org.apache.xml.resolver.tools.CatalogResolver(manager);
	}
	return resolver;
	}

	/**
	* Initializes the logger. Checks for null parameters.
	*
	* @param log the new logger
	*/
	private void initLogger(final ConfigurationLogger log) {
	this.log = log != null ? log : ConfigurationLogger.newDummyLogger();
	}

	/**
	* <p>
	* Implements the {@code resolveEntity} method for the SAX interface.
	* </p>
	* <p>
	* Presented with an optional public identifier and a system identifier, this function attempts to locate a mapping in
	* the catalogs.
	* </p>
	* <p>
	* If such a mapping is found, the resolver attempts to open the mapped value as an InputSource and return it.
	* Exceptions are ignored and null is returned if the mapped value cannot be opened as an input source.
	* </p>
	* <p>
	* If no mapping is found (or an error occurs attempting to open the mapped value as an input source), null is returned
	* and the system will use the specified system identifier as if no entityResolver was specified.
	* </p>
	*
	* @param publicId The public identifier for the entity in question. This may be null.
	* @param systemId The system identifier for the entity in question. XML requires a system identifier on all external
	* entities, so this value is always specified.
	* @return An InputSource for the mapped identifier, or null.
	* @throws SAXException if an error occurs.
	*/
	@SuppressWarnings("resource") // InputSource wraps an InputStream.
	@Override
	public InputSource resolveEntity(final String publicId, final String systemId) throws SAXException {
	String resolved = getResolver().getResolvedEntity(publicId, systemId);

	if (resolved != null) {
	final String badFilePrefix = "file://";
	final String correctFilePrefix = "file:///";

	// Java 5 has a bug when constructing file URLs
	if (resolved.startsWith(badFilePrefix) && !resolved.startsWith(correctFilePrefix)) {
	resolved = correctFilePrefix + resolved.substring(badFilePrefix.length());
	}

	try {
	final URL url = locate(fs, null, resolved);
	if (url == null) {
	throw new ConfigurationException("Could not locate " + resolved);
	}
	final InputStream inputStream = fs.getInputStream(url);
	final InputSource inputSource = new InputSource(resolved);
	inputSource.setPublicId(publicId);
	inputSource.setByteStream(inputStream);
	return inputSource;
	} catch (final Exception e) {
	log.warn("Failed to create InputSource for " + resolved, e);
	}
	}

	return null;
	}

	/**
	* Sets the base path.
	*
	* @param baseDir The base path String.
	*/
	public void setBaseDir(final String baseDir) {
	manager.setBaseDir(baseDir);
	}

	/**
	* Sets the list of catalog file names
	*
	* @param catalogs The delimited list of catalog files.
	*/
	public void setCatalogFiles(final String catalogs) {
	manager.setCatalogFiles(catalogs);
	}

	/**
	* Enables debug logging of xml-commons Catalog processing.
	*
	* @param debug True if debugging should be enabled, false otherwise.
	*/
	public void setDebug(final boolean debug) {
	manager.setVerbosity(debug ? DEBUG_ALL : DEBUG_NONE);
	}

	/**
	* Sets the FileSystem.
	*
	* @param fileSystem The FileSystem.
	*/
	public void setFileSystem(final FileSystem fileSystem) {
	this.fs = fileSystem;
	manager.setFileSystem(fileSystem);
	}

	/**
	* Sets the {@code ConfigurationInterpolator}.
	*
	* @param ci the {@code ConfigurationInterpolator}
	*/
	public void setInterpolator(final ConfigurationInterpolator ci) {
	manager.setInterpolator(ci);
	}

	/**
	* Allows setting the logger to be used by this object. This method makes it possible for clients to exactly control
	* logging behavior. Per default a logger is set that will ignore all log messages. Derived classes that want to enable
	* logging should call this method during their initialization with the logger to be used. Passing in <b>null</b> as
	* argument disables logging.
	*
	* @param log the new logger
	*/
	public void setLogger(final ConfigurationLogger log) {
	initLogger(log);
	}
	}