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package org.apache.wink.common.internal.application;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Set;

import javax.ws.rs.WebApplicationException;

import org.apache.wink.common.internal.i18n.Messages;
import org.apache.wink.common.internal.registry.metadata.ProviderMetadataCollector;
import org.apache.wink.common.internal.registry.metadata.ResourceMetadataCollector;
import org.apache.wink.common.internal.utils.ClassUtils;
import org.apache.wink.common.internal.utils.FileLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 

* Loads application file. The format of the file is a text file, while each * line contains a class name. *

* The default constructor loads core application. */ public class ApplicationFileLoader { private static final String WINK_APPLICATION = "META-INF/wink-application"; //$NON-NLS-1$ private static final Logger logger = LoggerFactory .getLogger(ApplicationFileLoader.class); private static final String CORE_APPLICATION = "META-INF/core/wink-providers"; //$NON-NLS-1$ private final Set> classes = new LinkedHashSet>(); /** * Loads core application file. * * @param loadWinkApplication - indicates if classes from * "META-INF/wink-application" files should be loaded * @throws FileNotFoundException if file is not found (should never happen) */ public ApplicationFileLoader(boolean loadWinkApplication) throws FileNotFoundException { this(CORE_APPLICATION); // load wink-application try { if (loadWinkApplication) { Enumeration applications = FileLoader.loadFileUsingClassLoaders(WINK_APPLICATION); while (applications.hasMoreElements()) { URL url = applications.nextElement(); if (logger.isInfoEnabled()) { logger .info(Messages.getMessage("loadingApplication", url.toExternalForm())); //$NON-NLS-1$ } loadClasses(url.openStream()); } } } catch (IOException e) { throw new WebApplicationException(e); } } /** * loads specific applicationConfigFile * * @param applicationConfigFile * @throws FileNotFoundException - if file is not found */ public ApplicationFileLoader(String appConfigFile) throws FileNotFoundException { if (logger.isTraceEnabled()) { logger.trace(Messages.getMessage("loadingApplication", appConfigFile)); //$NON-NLS-1$ } loadClasses(FileLoader.loadFileAsStream(appConfigFile)); } /** * loads specific applicationConfigFile * * @param applicationConfigFile * @throws FileNotFoundException - if file is not found */ public ApplicationFileLoader(InputStream appConfigFileStream) throws FileNotFoundException { loadClasses(appConfigFileStream); } final protected void loadClasses(InputStream is) { try { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is)); String line; l: while ((line = bufferedReader.readLine()) != null) { // ignore leading and trailing whitespace line = line.trim(); if (line.length() == 0) { // ignore empty lines continue l; } if (line.charAt(0) == '#') { // ignore lines that start with # continue l; } Class cls = null; try { // use ClassUtils.loadClass instead of Class.forName so we // have classloader visibility into the Web module in J2EE // environments cls = ClassUtils.loadClass(line); if (ResourceMetadataCollector.isStaticResource(cls) || ProviderMetadataCollector .isProvider(cls)) { if (logger.isTraceEnabled()) { logger.trace(Messages.getMessage("loadingClassToApplication", line)); //$NON-NLS-1$ } classes.add(cls); } else { if (logger.isWarnEnabled()) { logger.warn(Messages.getMessage("classNotAResourceNorProvider", cls //$NON-NLS-1$ .getName())); } } } catch (ClassNotFoundException e) { if (logger.isTraceEnabled()) { logger.trace("ClassNotFoundException while loading class", e); //$NON-NLS-1$ } } catch (NoClassDefFoundError e) { if (logger.isErrorEnabled()) { logger.error(Messages .getMessage("classInstantiationExceptionWithMsgFormat", line), e); //$NON-NLS-1$ } } } } catch (IOException e) { throw new WebApplicationException(e); } finally { try { is.close(); } catch (IOException e) { if (logger.isInfoEnabled()) { logger.info(Messages.getMessage("exceptionClosingFile"), e); //$NON-NLS-1$ } } } } public Set> getClasses() { return classes; } }





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