The Spring Framework PathMatchingResourcePatternResolver.java source code
/*
* Copyright 2002-2008 the original author or authors.
*
* 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 org.springframework.core.io.support;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.UrlResource;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.Assert;
import org.springframework.util.PathMatcher;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
/**
* A {@link ResourcePatternResolver} implementation that is able to resolve a
* specified resource location path into one or more matching Resources.
* The source path may be a simple path which has a one-to-one mapping to a
* target {@link org.springframework.core.io.Resource}, or alternatively
* may contain the special "<code>classpath*:" prefix and/or
* internal Ant-style regular expressions (matched using Spring's
* {@link org.springframework.util.AntPathMatcher} utility).
* Both of the latter are effectively wildcards.
*
* <p>No Wildcards:
*
* <p>In the simple case, if the specified location path does not start with the
* <code>"classpath*:" prefix, and does not contain a PathMatcher pattern,
* this resolver will simply return a single resource via a
* <code>getResource() call on the underlying ResourceLoader.
* Examples are real URLs such as "<code>file:C:/context.xml", pseudo-URLs
* such as "<code>classpath:/context.xml", and simple unprefixed paths
* such as "<code>/WEB-INF/context.xml". The latter will resolve in a
* fashion specific to the underlying <code>ResourceLoader (e.g.
* <code>ServletContextResource for a WebApplicationContext).
*
* <p>Ant-style Patterns:
*
* <p>When the path location contains an Ant-style pattern, e.g.:
* <pre>
* /WEB-INF/*-context.xml
* com/mycompany/**/applicationContext.xml
* file:C:/some/path/*-context.xml
* classpath:com/mycompany/**/applicationContext.xml</pre>
* the resolver follows a more complex but defined procedure to try to resolve
* the wildcard. It produces a <code>Resource for the path up to the last
* non-wildcard segment and obtains a <code>URL from it. If this URL is
* not a "<code>jar:" URL or container-specific variant (e.g.
* "<code>zip:" in WebLogic, "wsjar" in WebSphere", etc.),
* then a <code>java.io.File is obtained from it, and used to resolve the
* wildcard by walking the filesystem. In the case of a jar URL, the resolver
* either gets a <code>java.net.JarURLConnection from it, or manually parse
* the jar URL, and then traverse the contents of the jar file, to resolve the
* wildcards.
*
* <p>Implications on portability:
*
* <p>If the specified path is already a file URL (either explicitly, or
* implicitly because the base <code>ResourceLoader is a filesystem one,
* then wildcarding is guaranteed to work in a completely portable fashion.
*
* <p>If the specified path is a classpath location, then the resolver must
* obtain the last non-wildcard path segment URL via a
* <code>Classloader.getResource() call. Since this is just a
* node of the path (not the file at the end) it is actually undefined
* (in the ClassLoader Javadocs) exactly what sort of a URL is returned in
* this case. In practice, it is usually a <code>java.io.File representing
* the directory, where the classpath resource resolves to a filesystem
* location, or a jar URL of some sort, where the classpath resource resolves
* to a jar location. Still, there is a portability concern on this operation.
*
* <p>If a jar URL is obtained for the last non-wildcard segment, the resolver
* must be able to get a <code>java.net.JarURLConnection from it, or
* manually parse the jar URL, to be able to walk the contents of the jar,
* and resolve the wildcard. This will work in most environments, but will
* fail in others, and it is strongly recommended that the wildcard
* resolution of resources coming from jars be thoroughly tested in your
* specific environment before you rely on it.
*
* <p>classpath*: Prefix:
*
* <p>There is special support for retrieving multiple class path resources with
* the same name, via the "<code>classpath*:" prefix. For example,
* "<code>classpath*:META-INF/beans.xml" will find all "beans.xml"
* files in the class path, be it in "classes" directories or in JAR files.
* This is particularly useful for autodetecting config files of the same name
* at the same location within each jar file. Internally, this happens via a
* <code>ClassLoader.getResources() call, and is completely portable.
*
* <p>The "classpath*:" prefix can also be combined with a PathMatcher pattern in
* the rest of the location path, for example "classpath*:META-INF/*-beans.xml".
* In this case, the resolution strategy is fairly simple: a
* <code>ClassLoader.getResources() call is used on the last non-wildcard
* path segment to get all the matching resources in the class loader hierarchy,
* and then off each resource the same PathMatcher resolution strategy described
* above is used for the wildcard subpath.
*
* <p>Other notes:
*
* <p>WARNING: Note that "classpath*:" when combined with
* Ant-style patterns will only work reliably with at least one root directory
* before the pattern starts, unless the actual target files reside in the file
* system. This means that a pattern like "<code>classpath*:*.xml" will
* <i>not retrieve files from the root of jar files but rather only from the
* root of expanded directories. This originates from a limitation in the JDK's
* <code>ClassLoader.getResources() method which only returns file system
* locations for a passed-in empty String (indicating potential roots to search).
*
* <p>WARNING: Ant-style patterns with "classpath:" resources are not
* guaranteed to find matching resources if the root package to search is available
* in multiple class path locations. This is because a resource such as<pre>
* com/mycompany/package1/service-context.xml
* </pre>may be in only one location, but when a path such as * classpath:com/mycompany/**/service-context.xml
* </pre>is used to try to resolve it, the resolver will work off the (first) URL
* returned by <code>getResource("com/mycompany");. If this base package
* node exists in multiple classloader locations, the actual end resource may
* not be underneath. Therefore, preferably, use "<code>classpath*:" with the same
* Ant-style pattern in such a case, which will search <i>all class path
* locations that contain the root package.
*
* @author Juergen Hoeller
* @author Colin Sampaleanu
* @since 1.0.2
* @see #CLASSPATH_ALL_URL_PREFIX
* @see org.springframework.util.AntPathMatcher
* @see org.springframework.core.io.ResourceLoader#getResource(String)
* @see java.lang.ClassLoader#getResources(String)
*/
public class PathMatchingResourcePatternResolver implements ResourcePatternResolver {
private static final Log logger = LogFactory.getLog(PathMatchingResourcePatternResolver.class);
private static Method equinoxResolveMethod;
static {
// Detect Equinox OSGi (e.g. on WebSphere 6.1)
try {
Class fileLocatorClass = PathMatchingResourcePatternResolver.class.getClassLoader().loadClass(
"org.eclipse.core.runtime.FileLocator");
equinoxResolveMethod = fileLocatorClass.getMethod("resolve", new Class[] {URL.class});
logger.debug("Found Equinox FileLocator for OSGi bundle URL resolution");
}
catch (Exception ex) {
equinoxResolveMethod = null;
}
}
private final ResourceLoader resourceLoader;
private PathMatcher pathMatcher = new AntPathMatcher();
/**
* Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
* <p>ClassLoader access will happen via the thread context class loader.
* @see org.springframework.core.io.DefaultResourceLoader
*/
public PathMatchingResourcePatternResolver() {
this.resourceLoader = new DefaultResourceLoader();
}
/**
* Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
* @param classLoader the ClassLoader to load classpath resources with,
* or <code>null for using the thread context class loader
* @see org.springframework.core.io.DefaultResourceLoader
*/
public PathMatchingResourcePatternResolver(ClassLoader classLoader) {
this.resourceLoader = new DefaultResourceLoader(classLoader);
}
/**
* Create a new PathMatchingResourcePatternResolver.
* <p>ClassLoader access will happen via the thread context class loader.
* @param resourceLoader the ResourceLoader to load root directories and
* actual resources with
*/
public PathMatchingResourcePatternResolver(ResourceLoader resourceLoader) {
Assert.notNull(resourceLoader, "ResourceLoader must not be null");
this.resourceLoader = resourceLoader;
}
/**
* Return the ResourceLoader that this pattern resolver works with.
*/
public ResourceLoader getResourceLoader() {
return this.resourceLoader;
}
/**
* Return the ClassLoader that this pattern resolver works with
* (never <code>null).
*/
public ClassLoader getClassLoader() {
return getResourceLoader().getClassLoader();
}
/**
* Set the PathMatcher implementation to use for this
* resource pattern resolver. Default is AntPathMatcher.
* @see org.springframework.util.AntPathMatcher
*/
public void setPathMatcher(PathMatcher pathMatcher) {
Assert.notNull(pathMatcher, "PathMatcher must not be null");
this.pathMatcher = pathMatcher;
}
/**
* Return the PathMatcher that this resource pattern resolver uses.
*/
public PathMatcher getPathMatcher() {
return this.pathMatcher;
}
public Resource getResource(String location) {
return getResourceLoader().getResource(location);
}
public Resource[] getResources(String locationPattern) throws IOException {
Assert.notNull(locationPattern, "Location pattern must not be null");
if (locationPattern.startsWith(CLASSPATH_ALL_URL_PREFIX)) {
// a class path resource (multiple resources for same name possible)
if (getPathMatcher().isPattern(locationPattern.substring(CLASSPATH_ALL_URL_PREFIX.length()))) {
// a class path resource pattern
return findPathMatchingResources(locationPattern);
}
else {
// all class path resources with the given name
return findAllClassPathResources(locationPattern.substring(CLASSPATH_ALL_URL_PREFIX.length()));
}
}
else {
// Only look for a pattern after a prefix here
// (to not get fooled by a pattern symbol in a strange prefix).
int prefixEnd = locationPattern.indexOf(":") + 1;
if (getPathMatcher().isPattern(locationPattern.substring(prefixEnd))) {
// a file pattern
return findPathMatchingResources(locationPattern);
}
else {
// a single resource with the given name
return new Resource[] {getResourceLoader().getResource(locationPattern)};
}
}
}
/**
* Find all class location resources with the given location via the ClassLoader.
* @param location the absolute path within the classpath
* @return the result as Resource array
* @throws IOException in case of I/O errors
* @see java.lang.ClassLoader#getResources
* @see #convertClassLoaderURL
*/
protected Resource[] findAllClassPathResources(String location) throws IOException {
String path = location;
if (path.startsWith("/")) {
path = path.substring(1);
}
Enumeration resourceUrls = getClassLoader().getResources(path);
Set result = new LinkedHashSet(16);
while (resourceUrls.hasMoreElements()) {
URL url = (URL) resourceUrls.nextElement();
result.add(convertClassLoaderURL(url));
}
return (Resource[]) result.toArray(new Resource[result.size()]);
}
/**
* Convert the given URL as returned from the ClassLoader into a Resource object.
* <p>The default implementation simply creates a UrlResource instance.
* @param url a URL as returned from the ClassLoader
* @return the corresponding Resource object
* @see java.lang.ClassLoader#getResources
* @see org.springframework.core.io.Resource
*/
protected Resource convertClassLoaderURL(URL url) {
return new UrlResource(url);
}
/**
* Find all resources that match the given location pattern via the
* Ant-style PathMatcher. Supports resources in jar files and zip files
* and in the file system.
* @param locationPattern the location pattern to match
* @return the result as Resource array
* @throws IOException in case of I/O errors
* @see #doFindPathMatchingJarResources
* @see #doFindPathMatchingFileResources
* @see org.springframework.util.PathMatcher
*/
protected Resource[] findPathMatchingResources(String locationPattern) throws IOException {
String rootDirPath = determineRootDir(locationPattern);
String subPattern = locationPattern.substring(rootDirPath.length());
Resource[] rootDirResources = getResources(rootDirPath);
Set result = new LinkedHashSet(16);
for (int i = 0; i < rootDirResources.length; i++) {
Resource rootDirResource = resolveRootDirResource(rootDirResources[i]);
if (isJarResource(rootDirResource)) {
result.addAll(doFindPathMatchingJarResources(rootDirResource, subPattern));
}
else {
result.addAll(doFindPathMatchingFileResources(rootDirResource, subPattern));
}
}
if (logger.isDebugEnabled()) {
logger.debug("Resolved location pattern [" + locationPattern + "] to resources " + result);
}
return (Resource[]) result.toArray(new Resource[result.size()]);
}
/**
* Determine the root directory for the given location.
* <p>Used for determining the starting point for file matching,
* resolving the root directory location to a <code>java.io.File
* and passing it into <code>retrieveMatchingFiles, with the
* remainder of the location as pattern.
* <p>Will return "/WEB-INF" for the pattern "/WEB-INF/*.xml",
* for example.
* @param location the location to check
* @return the part of the location that denotes the root directory
* @see #retrieveMatchingFiles
*/
protected String determineRootDir(String location) {
int prefixEnd = location.indexOf(":") + 1;
int rootDirEnd = location.length();
while (rootDirEnd > prefixEnd && getPathMatcher().isPattern(location.substring(prefixEnd, rootDirEnd))) {
rootDirEnd = location.lastIndexOf('/', rootDirEnd - 2) + 1;
}
if (rootDirEnd == 0) {
rootDirEnd = prefixEnd;
}
return location.substring(0, rootDirEnd);
}
/**
* Resolve the specified resource for path matching.
* <p>The default implementation detects an Equinox OSGi "bundleresource:"
* / "bundleentry:" URL and resolves it into a standard jar file URL that
* can be traversed using Spring's standard jar file traversal algorithm.
* @param original the resource to resolfe
* @return the resolved resource (may be identical to the passed-in resource)
* @throws IOException in case of resolution failure
*/
protected Resource resolveRootDirResource(Resource original) throws IOException {
if (equinoxResolveMethod != null) {
URL url = original.getURL();
if (url.getProtocol().startsWith("bundle")) {
return new UrlResource((URL) ReflectionUtils.invokeMethod(equinoxResolveMethod, null, new Object[] {url}));
}
}
return original;
}
/**
* Return whether the given resource handle indicates a jar resource
* that the <code>doFindPathMatchingJarResources method can handle.
* <p>The default implementation checks against the URL protocols
* "jar", "zip" and "wsjar" (the latter are used by BEA WebLogic Server
* and IBM WebSphere, respectively, but can be treated like jar files).
* @param resource the resource handle to check
* (usually the root directory to start path matching from)
* @see #doFindPathMatchingJarResources
* @see org.springframework.util.ResourceUtils#isJarURL
*/
protected boolean isJarResource(Resource resource) throws IOException {
return ResourceUtils.isJarURL(resource.getURL());
}
/**
* Find all resources in jar files that match the given location pattern
* via the Ant-style PathMatcher.
* @param rootDirResource the root directory as Resource
* @param subPattern the sub pattern to match (below the root directory)
* @return the Set of matching Resource instances
* @throws IOException in case of I/O errors
* @see java.net.JarURLConnection
* @see org.springframework.util.PathMatcher
*/
protected Set doFindPathMatchingJarResources(Resource rootDirResource, String subPattern) throws IOException {
URLConnection con = rootDirResource.getURL().openConnection();
JarFile jarFile = null;
boolean newJarFile = false;
String jarFileUrl = null;
String rootEntryPath = null;
if (con instanceof JarURLConnection) {
// Should usually be the case for traditional JAR files.
JarURLConnection jarCon = (JarURLConnection) con;
jarCon.setUseCaches(false);
jarFile = jarCon.getJarFile();
jarFileUrl = jarCon.getJarFileURL().toExternalForm();
JarEntry jarEntry = jarCon.getJarEntry();
rootEntryPath = (jarEntry != null ? jarEntry.getName() : "");
}
else {
// No JarURLConnection -> need to resort to URL file parsing.
// We'll assume URLs of the format "jar:path!/entry", with the protocol
// being arbitrary as long as following the entry format.
// We'll also handle paths with and without leading "file:" prefix.
String urlFile = rootDirResource.getURL().getFile();
int separatorIndex = urlFile.indexOf(ResourceUtils.JAR_URL_SEPARATOR);
jarFileUrl = urlFile.substring(0, separatorIndex);
if (jarFileUrl.startsWith(ResourceUtils.FILE_URL_PREFIX)) {
jarFileUrl = jarFileUrl.substring(ResourceUtils.FILE_URL_PREFIX.length());
}
jarFile = new JarFile(jarFileUrl);
newJarFile = true;
jarFileUrl = ResourceUtils.FILE_URL_PREFIX + jarFileUrl;
rootEntryPath = urlFile.substring(separatorIndex + ResourceUtils.JAR_URL_SEPARATOR.length());
}
try {
if (logger.isDebugEnabled()) {
logger.debug("Looking for matching resources in jar file [" + jarFileUrl + "]");
}
if (!"".equals(rootEntryPath) && !rootEntryPath.endsWith("/")) {
// Root entry path must end with slash to allow for proper matching.
// The Sun JRE does not return a slash here, but BEA JRockit does.
rootEntryPath = rootEntryPath + "/";
}
Set result = new LinkedHashSet(8);
for (Enumeration entries = jarFile.entries(); entries.hasMoreElements();) {
JarEntry entry = (JarEntry) entries.nextElement();
String entryPath = entry.getName();
if (entryPath.startsWith(rootEntryPath)) {
String relativePath = entryPath.substring(rootEntryPath.length());
if (getPathMatcher().match(subPattern, relativePath)) {
result.add(rootDirResource.createRelative(relativePath));
}
}
}
return result;
}
finally {
// Close jar file, but only if freshly obtained -
// not from JarURLConnection, which might cache the file reference.
if (newJarFile) {
jarFile.close();
}
}
}
/**
* Find all resources in the file system that match the given location pattern
* via the Ant-style PathMatcher.
* @param rootDirResource the root directory as Resource
* @param subPattern the sub pattern to match (below the root directory)
* @return the Set of matching Resource instances
* @throws IOException in case of I/O errors
* @see #retrieveMatchingFiles
* @see org.springframework.util.PathMatcher
*/
protected Set doFindPathMatchingFileResources(Resource rootDirResource, String subPattern) throws IOException {
File rootDir = null;
try {
rootDir = rootDirResource.getFile().getAbsoluteFile();
}
catch (IOException ex) {
if (logger.isDebugEnabled()) {
logger.debug("Cannot search for matching files underneath " + rootDirResource +
" because it does not correspond to a directory in the file system", ex);
}
return Collections.EMPTY_SET;
}
return doFindMatchingFileSystemResources(rootDir, subPattern);
}
/**
* Find all resources in the file system that match the given location pattern
* via the Ant-style PathMatcher.
* @param rootDir the root directory in the file system
* @param subPattern the sub pattern to match (below the root directory)
* @return the Set of matching Resource instances
* @throws IOException in case of I/O errors
* @see #retrieveMatchingFiles
* @see org.springframework.util.PathMatcher
*/
protected Set doFindMatchingFileSystemResources(File rootDir, String subPattern) throws IOException {
if (logger.isDebugEnabled()) {
logger.debug("Looking for matching resources in directory tree [" + rootDir.getPath() + "]");
}
Set matchingFiles = retrieveMatchingFiles(rootDir, subPattern);
Set result = new LinkedHashSet(matchingFiles.size());
for (Iterator it = matchingFiles.iterator(); it.hasNext();) {
File file = (File) it.next();
result.add(new FileSystemResource(file));
}
return result;
}
/**
* Retrieve files that match the given path pattern,
* checking the given directory and its subdirectories.
* @param rootDir the directory to start from
* @param pattern the pattern to match against,
* relative to the root directory
* @return the Set of matching File instances
* @throws IOException if directory contents could not be retrieved
*/
protected Set retrieveMatchingFiles(File rootDir, String pattern) throws IOException {
if (!rootDir.isDirectory()) {
throw new IllegalArgumentException("Resource path [" + rootDir + "] does not denote a directory");
}
String fullPattern = StringUtils.replace(rootDir.getAbsolutePath(), File.separator, "/");
if (!pattern.startsWith("/")) {
fullPattern += "/";
}
fullPattern = fullPattern + StringUtils.replace(pattern, File.separator, "/");
Set result = new LinkedHashSet(8);
doRetrieveMatchingFiles(fullPattern, rootDir, result);
return result;
}
/**
* Recursively retrieve files that match the given pattern,
* adding them to the given result list.
* @param fullPattern the pattern to match against,
* with preprended root directory path
* @param dir the current directory
* @param result the Set of matching File instances to add to
* @throws IOException if directory contents could not be retrieved
*/
protected void doRetrieveMatchingFiles(String fullPattern, File dir, Set result) throws IOException {
if (logger.isDebugEnabled()) {
logger.debug("Searching directory [" + dir.getAbsolutePath() +
"] for files matching pattern [" + fullPattern + "]");
}
File[] dirContents = dir.listFiles();
if (dirContents == null) {
throw new IOException("Could not retrieve contents of directory [" + dir.getAbsolutePath() + "]");
}
for (int i = 0; i < dirContents.length; i++) {
File content = dirContents[i];
String currPath = StringUtils.replace(content.getAbsolutePath(), File.separator, "/");
if (content.isDirectory() && getPathMatcher().matchStart(fullPattern, currPath + "/")) {
doRetrieveMatchingFiles(fullPattern, content, result);
}
if (getPathMatcher().match(fullPattern, currPath)) {
result.add(content);
}
}
}
}
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