com.ocpsoft.pretty.faces.config.annotation.WebClassesFinder Maven / Gradle / Ivy
/*
* Copyright 2010 Lincoln Baxter, III
*
* Licensed 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 com.ocpsoft.pretty.faces.config.annotation;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Set;
import javax.servlet.ServletContext;
/**
* Implementation of {@link ClassFinder} that searches for classes in the
* /WEB-INF/classes directory of a web application.
*
* @author Christian Kaltepoth
*/
public class WebClassesFinder extends AbstractClassFinder
{
/**
* The name of the classes directory
*/
private final static String CLASSES_FOLDER = "/WEB-INF/classes/";
/**
* Initialization
*/
public WebClassesFinder(ServletContext servletContext, ClassLoader classLoader, PackageFilter packageFilter)
{
super(servletContext, classLoader, packageFilter);
}
/*
* @see
* com.ocpsoft.pretty.faces.config.annotation.ClassFinder#findClasses(com
* .ocpsoft.pretty.config.annotation.PrettyAnnotationHandler)
*/
public void findClasses(PrettyAnnotationHandler handler)
{
try
{
// we start the recursive scan in the classes folder
URL classesFolderUrl = servletContext.getResource(CLASSES_FOLDER);
// abort if classes folder is missing
if (classesFolderUrl == null)
{
log.warn("Cannot find classes folder: " + CLASSES_FOLDER);
return;
}
// call recursive directory processing method
processDirectory(classesFolderUrl, classesFolderUrl, handler);
}
catch (MalformedURLException e)
{
throw new IllegalStateException("Invalid URL: " + e.getMessage(), e);
}
}
/**
* Scan for classes in a single directory. This method will call itself
* recursively if it finds other directories and call
* {@link #processClassURL(URL, PrettyAnnotationHandler)} when it finds a
* file ending with ".class" and that is accepted by the
* {@link PackageFilter}
*
* @param directoryUrl
* The URL of the directory to scan
* @param handler
* The handler class for classes found
* @throws MalformedURLException
* for invalid URLs
*/
protected void processDirectory(URL classesFolderUrl, URL directoryUrl, PrettyAnnotationHandler handler) throws MalformedURLException
{
// only the path of the classes folder URL is required in this method
String classesFolderPath = classesFolderUrl.getPath();
// log directory name on trace level
if (log.isTraceEnabled())
{
log.trace("Processing directory: " + directoryUrl.toString());
}
// get the directory name relative to the '/WEB-INF/classes/' folder
String relativeDirectoryName = getPathRelativeToClassesFolder(directoryUrl.getPath(), classesFolderPath);
// call getResourcePaths to get directory entries
Set paths = servletContext.getResourcePaths(CLASSES_FOLDER+relativeDirectoryName);
// loop over all entries of the directory
for (Object relativePath : paths)
{
// get full URL for this entry
URL entryUrl = servletContext.getResource(relativePath.toString());
// if this URL ends with .class it is a Java class
if (entryUrl.getPath().endsWith(".class"))
{
// the name of the entry relative to the '/WEB-INF/classes/' folder
String entryRelativeName = getPathRelativeToClassesFolder(entryUrl.getPath(), classesFolderPath);
// build class name from relative name
String className = getClassName(entryRelativeName);
// check filter
if (mustProcessClass(className))
{
// the class file stream
InputStream classFileStream = null;
// close the stream in finally block
try
{
/*
* Try to open the .class file. If an IOException is thrown,
* we will scan it anyway.
*/
try
{
classFileStream = entryUrl.openStream();
}
catch (IOException e)
{
if (log.isDebugEnabled())
{
log.debug("Cound not obtain InputStream for class file: "+entryUrl.toString(), e);
}
}
// analyze the class (with or without classFileStream)
processClass(className, classFileStream, handler);
}
finally
{
try
{
if (classFileStream != null)
{
classFileStream.close();
}
}
catch (IOException e)
{
if (log.isDebugEnabled())
{
log.debug("Failed to close input stream: " + e.getMessage());
}
}
}
}
}
// if this URL ends with a slash, its a directory
if (entryUrl.getPath().endsWith("/"))
{
// walk down the directory
processDirectory(classesFolderUrl, entryUrl, handler);
}
}
}
/**
* This method will create a path relative to the '/WEB-INF/classes/' folder
* for the given path. It will first try to find the '/WEB-INF/classes/'
* suffix in the path to do so. If this suffix cannot be found (can happen
* when using the jetty-maven-plugin with 'jetty:run' goal), the method will
* try to build the relative name by stripping the path of the
* '/WEB-INF/classes/' folder which must be supplied to the method. The
* method will throw an {@link IllegalArgumentException} if the relative path
* could not be build.
*
* @param path
* The path to build the relative path for
* @param classesFolderPath
* the known path of the '/WEB-INF/classes/' folder.
* @return the relative name of the path
*/
private String getPathRelativeToClassesFolder(String path, String classesFolderPath)
{
// first try to find the '/WEB-INF/classes' suffix
String result = stripKnownPrefix(path, CLASSES_FOLDER);
// alternative: try to strip the full path of the '/WEB-INF/classes/' folder
if (result == null)
{
result = stripKnownPrefix(path, classesFolderPath);
}
// none of the two methods worked?
if (result == null)
{
throw new IllegalArgumentException("Unable to build path relative to '/WEB-INF/classes/' from: "+path);
}
return result;
}
}
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