PathMatchingResourcePatternResolver (hotswap-agent-core 1.1.0 API)

java.lang.Object
- org.hotswap.agent.util.spring.path.PathMatchingResourcePatternResolver

All Implemented Interfaces:

ResourceLoader, ResourcePatternResolver
```
public class PathMatchingResourcePatternResolver
extends Object
implements ResourcePatternResolver
```
A 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 org.hotswap.agent.util.spring.io.resource.springframework.core.io.Resource , or alternatively may contain the special "classpath*:" prefix and/or internal Ant-style regular expressions (matched using Spring's org.hotswap.agent.util.spring.path.springframework.util.AntPathMatcher utility). Both of the latter are effectively wildcards.
No Wildcards:
In the simple case, if the specified location path does not start with the "classpath*:" prefix, and does not contain a PathMatcher pattern, this resolver will simply return a single resource via a getResource() call on the underlying ResourceLoader. Examples are real URLs such as "file:C:/context.xml", pseudo-URLs such as "classpath:/context.xml", and simple unprefixed paths such as "/WEB-INF/context.xml". The latter will resolve in a fashion specific to the underlying ResourceLoader (e.g. ServletContextResource for a WebApplicationContext).
Ant-style Patterns:
When the path location contains an Ant-style pattern, e.g.:
```
 /WEB-INF/*-context.xml
 com/mycompany/**/applicationContext.xml
 file:C:/some/path/*-context.xml
 classpath:com/mycompany/**/applicationContext.xml
 
```
the resolver follows a more complex but defined procedure to try to resolve the wildcard. It produces a Resource for the path up to the last non-wildcard segment and obtains a URL from it. If this URL is not a "jar:" URL or container-specific variant (e.g. "zip:" in WebLogic, "wsjar" in WebSphere", etc.), then a 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 java.net.JarURLConnection from it, or manually parses the jar URL, and then traverses the contents of the jar file, to resolve the wildcards.
Implications on portability:
If the specified path is already a file URL (either explicitly, or implicitly because the base ResourceLoader is a filesystem one, then wildcarding is guaranteed to work in a completely portable fashion.
If the specified path is a classpath location, then the resolver must obtain the last non-wildcard path segment URL via a 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 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.
If a jar URL is obtained for the last non-wildcard segment, the resolver must be able to get a 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.
classpath*: Prefix:
There is special support for retrieving multiple class path resources with the same name, via the "classpath*:" prefix. For example, "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 ClassLoader.getResources() call, and is completely portable.
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 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.
Other notes:
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 "classpath*:*.xml" will 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 ClassLoader.getResources() method which only returns file system locations for a passed-in empty String (indicating potential roots to search).
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
```
 com / mycompany / package1 / service - context.xml
 
```
may be in only one location, but when a path such as
```
     classpath:com/mycompany/**/service-context.xml
 
```
is used to try to resolve it, the resolver will work off the (first) URL returned by getResource("com/mycompany");. If this base package node exists in multiple classloader locations, the actual end resource may not be underneath. Therefore, preferably, use "classpath*:" with the same Ant-style pattern in such a case, which will search all class path locations that contain the root package.
Since:

1.0.2

Author:

Juergen Hoeller, Colin Sampaleanu, Marius Bogoevici, Costin Leau

See Also:

ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX, org.hotswap.agent.util.spring.path.springframework.util.AntPathMatcher, org.hotswap.agent.util.spring.io.loader.springframework.core.io.ResourceLoader#getResource(String), ClassLoader.getResources(String)

Field Summary
- Fields inherited from interface org.hotswap.agent.util.spring.path.ResourcePatternResolver
  CLASSPATH_ALL_URL_PREFIX
- Fields inherited from interface org.hotswap.agent.util.spring.io.loader.ResourceLoader
  CLASSPATH_URL_PREFIX

Constructor Summary

Constructors
Constructor and Description
`PathMatchingResourcePatternResolver()` Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
`PathMatchingResourcePatternResolver(ClassLoader classLoader)` Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
`PathMatchingResourcePatternResolver(ResourceLoader resourceLoader)` Create a new PathMatchingResourcePatternResolver.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected void`	`addAllClassLoaderJarRoots(ClassLoader classLoader, Set<Resource> result)` Search all `URLClassLoader` URLs for jar file references and add them to the given set of resources in the form of pointers to the root of the jar file content.
`protected Resource`	`convertClassLoaderURL(URL url)` Convert the given URL as returned from the ClassLoader into a `Resource`.
`protected String`	`determineRootDir(String location)` Determine the root directory for the given location.
`protected Set<Resource>`	`doFindAllClassPathResources(String path)` Find all class location resources with the given path via the ClassLoader.
`protected Set<Resource>`	`doFindMatchingFileSystemResources(File rootDir, String subPattern)` Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
`protected Set<Resource>`	`doFindPathMatchingFileResources(Resource rootDirResource, String subPattern)` Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
`protected Set<Resource>`	`doFindPathMatchingJarResources(Resource rootDirResource, String subPattern)` Find all resources in jar files that match the given location pattern via the Ant-style PathMatcher.
`protected void`	`doRetrieveMatchingFiles(String fullPattern, File dir, Set<File> result)` Recursively retrieve files that match the given pattern, adding them to the given result list.
`protected Resource[]`	`findAllClassPathResources(String location)` Find all class location resources with the given location via the ClassLoader.
`protected Resource[]`	`findPathMatchingResources(String locationPattern)` Find all resources that match the given location pattern via the Ant-style PathMatcher.
`ClassLoader`	`getClassLoader()` Expose the ClassLoader used by this ResourceLoader.
`protected JarFile`	`getJarFile(String jarFileUrl)` Resolve the given jar file URL into a JarFile object.
`PathMatcher`	`getPathMatcher()` Return the PathMatcher that this resource pattern resolver uses.
`Resource`	`getResource(String location)` Return a Resource handle for the specified resource.
`ResourceLoader`	`getResourceLoader()` Return the ResourceLoader that this pattern resolver works with.
`Resource[]`	`getResources(String locationPattern)` Resolve the given location pattern into Resource objects.
`protected boolean`	`isJarResource(Resource resource)` Return whether the given resource handle indicates a jar resource that the `doFindPathMatchingJarResources` method can handle.
`protected Resource`	`resolveRootDirResource(Resource original)` Resolve the specified resource for path matching.
`protected Set<File>`	`retrieveMatchingFiles(File rootDir, String pattern)` Retrieve files that match the given path pattern, checking the given directory and its subdirectories.
`void`	`setPathMatcher(PathMatcher pathMatcher)` Set the PathMatcher implementation to use for this resource pattern resolver.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PathMatchingResourcePatternResolver
```
public PathMatchingResourcePatternResolver()
```
    Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
    ClassLoader access will happen via the thread context class loader.
    
    See Also:
    
    DefaultResourceLoader
  - PathMatchingResourcePatternResolver
```
public PathMatchingResourcePatternResolver(ResourceLoader resourceLoader)
```
    Create a new PathMatchingResourcePatternResolver.
    ClassLoader access will happen via the thread context class loader.
    
    Parameters:
    
    resourceLoader - the ResourceLoader to load root directories and actual resources with
  - PathMatchingResourcePatternResolver
```
public PathMatchingResourcePatternResolver(ClassLoader classLoader)
```
    Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
    
    Parameters:
    
    classLoader - the ClassLoader to load classpath resources with, or null for using the thread context class loader at the time of actual resource access
    
    See Also:
    
    DefaultResourceLoader
- Method Detail
  - getResourceLoader
```
public ResourceLoader getResourceLoader()
```
    Return the ResourceLoader that this pattern resolver works with.
  - getClassLoader
```
public ClassLoader getClassLoader()
```
    Description copied from interface: ResourceLoader
    
    Expose the ClassLoader used by this ResourceLoader.
    Clients which need to access the ClassLoader directly can do so in a uniform manner with the ResourceLoader, rather than relying on the thread context ClassLoader.
    
    Specified by:
    
    getClassLoader in interface ResourceLoader
    
    Returns:
    
    the ClassLoader (only null if even the system ClassLoader isn't accessible)
    
    See Also:
    
    org.springframework.util.ClassUtils#getDefaultClassLoader()
  - setPathMatcher
```
public void setPathMatcher(PathMatcher pathMatcher)
```
    Set the PathMatcher implementation to use for this resource pattern resolver. Default is AntPathMatcher.
    
    See Also:
    
    AntPathMatcher
  - getPathMatcher
```
public PathMatcher getPathMatcher()
```
    Return the PathMatcher that this resource pattern resolver uses.
  - getResource
```
public Resource getResource(String location)
```
    Description copied from interface: ResourceLoader
    Return a Resource handle for the specified resource. The handle should always be a reusable resource descriptor, allowing for multiple InputStreamSource.getInputStream() calls.
    - Must support fully qualified URLs, e.g. "file:C:/test.dat".
    - Must support classpath pseudo-URLs, e.g. "classpath:test.dat".
    - Should support relative file paths, e.g. "WEB-INF/test.dat". (This will be implementation-specific, typically provided by an ApplicationContext implementation.)
    Note that a Resource handle does not imply an existing resource; you need to invoke Resource.exists() to check for existence.
    Specified by:
    
    getResource in interface ResourceLoader
    
    Parameters:
    
    location - the resource location
    
    Returns:
    
    a corresponding Resource handle
    
    See Also:
    
    ResourceLoader.CLASSPATH_URL_PREFIX, org.hotswap.agent.util.spring.io.resource.springframework.core.io.Resource#exists, org.hotswap.agent.util.spring.io.resource.springframework.core.io.Resource#getInputStream
  - getResources
```
public Resource[] getResources(String locationPattern)
                        throws IOException
```
    Description copied from interface: ResourcePatternResolver
    
    Resolve the given location pattern into Resource objects.
    Overlapping resource entries that point to the same physical resource should be avoided, as far as possible. The result should have set semantics.
    
    Specified by:
    
    getResources in interface ResourcePatternResolver
    
    Parameters:
    
    locationPattern - the location pattern to resolve
    
    Returns:
    
    the corresponding Resource objects
    
    Throws:
    
    IOException - in case of I/O errors
  - findAllClassPathResources
```
protected Resource[] findAllClassPathResources(String location)
                                        throws IOException
```
    Find all class location resources with the given location via the ClassLoader. Delegates to doFindAllClassPathResources(String).
    
    Parameters:
    
    location - the absolute path within the classpath
    
    Returns:
    
    the result as Resource array
    
    Throws:
    
    IOException - in case of I/O errors
    
    See Also:
    
    ClassLoader.getResources(java.lang.String), convertClassLoaderURL(java.net.URL)
  - doFindAllClassPathResources
```
protected Set<Resource> doFindAllClassPathResources(String path)
                                             throws IOException
```
    Find all class location resources with the given path via the ClassLoader. Called by findAllClassPathResources(String).
    
    Parameters:
    
    path - the absolute path within the classpath (never a leading slash)
    
    Returns:
    
    a mutable Set of matching Resource instances
    
    Throws:
    
    IOException
  - convertClassLoaderURL
```
protected Resource convertClassLoaderURL(URL url)
```
    Convert the given URL as returned from the ClassLoader into a Resource.
    The default implementation simply creates a UrlResource instance.
    
    Parameters:
    
    url - a URL as returned from the ClassLoader
    
    Returns:
    
    the corresponding Resource object
    
    See Also:
    
    ClassLoader.getResources(java.lang.String), Resource
  - addAllClassLoaderJarRoots
```
protected void addAllClassLoaderJarRoots(ClassLoader classLoader,
                                         Set<Resource> result)
```
    Search all URLClassLoader URLs for jar file references and add them to the given set of resources in the form of pointers to the root of the jar file content.
    
    Parameters:
    
    classLoader - the ClassLoader to search (including its ancestors)
    
    result - the set of resources to add jar roots to
  - findPathMatchingResources
```
protected Resource[] findPathMatchingResources(String locationPattern)
                                        throws IOException
```
    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.
    
    Parameters:
    
    locationPattern - the location pattern to match
    
    Returns:
    
    the result as Resource array
    
    Throws:
    
    IOException - in case of I/O errors
    
    See Also:
    
    doFindPathMatchingJarResources(org.hotswap.agent.util.spring.io.resource.Resource, java.lang.String), doFindPathMatchingFileResources(org.hotswap.agent.util.spring.io.resource.Resource, java.lang.String), org.hotswap.agent.util.spring.path.springframework.util.PathMatcher
  - determineRootDir
```
protected String determineRootDir(String location)
```
    Determine the root directory for the given location.
    Used for determining the starting point for file matching, resolving the root directory location to a java.io.File and passing it into retrieveMatchingFiles, with the remainder of the location as pattern.
    Will return "/WEB-INF/" for the pattern "/WEB-INF/*.xml", for example.
    
    Parameters:
    
    location - the location to check
    
    Returns:
    
    the part of the location that denotes the root directory
    
    See Also:
    
    retrieveMatchingFiles(java.io.File, java.lang.String)
  - resolveRootDirResource
```
protected Resource resolveRootDirResource(Resource original)
                                   throws IOException
```
    Resolve the specified resource for path matching.
    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.
    
    Parameters:
    
    original - the resource to resolve
    
    Returns:
    
    the resolved resource (may be identical to the passed-in resource)
    
    Throws:
    
    IOException - in case of resolution failure
  - isJarResource
```
protected boolean isJarResource(Resource resource)
                         throws IOException
```
    Return whether the given resource handle indicates a jar resource that the doFindPathMatchingJarResources method can handle.
    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).
    
    Parameters:
    
    resource - the resource handle to check (usually the root directory to start path matching from)
    
    Throws:
    
    IOException
    
    See Also:
    
    doFindPathMatchingJarResources(org.hotswap.agent.util.spring.io.resource.Resource, java.lang.String), org.hotswap.agent.util.spring.util.springframework.util.ResourceUtils#isJarURL
  - doFindPathMatchingJarResources
```
protected Set<Resource> doFindPathMatchingJarResources(Resource rootDirResource,
                                                       String subPattern)
                                                throws IOException
```
    Find all resources in jar files that match the given location pattern via the Ant-style PathMatcher.
    
    Parameters:
    
    rootDirResource - the root directory as Resource
    
    subPattern - the sub pattern to match (below the root directory)
    
    Returns:
    
    a mutable Set of matching Resource instances
    
    Throws:
    
    IOException - in case of I/O errors
    
    See Also:
    
    JarURLConnection, org.hotswap.agent.util.spring.path.springframework.util.PathMatcher
  - getJarFile
```
protected JarFile getJarFile(String jarFileUrl)
                      throws IOException
```
    Resolve the given jar file URL into a JarFile object.
    
    Throws:
    
    IOException
  - doFindPathMatchingFileResources
```
protected Set<Resource> doFindPathMatchingFileResources(Resource rootDirResource,
                                                        String subPattern)
                                                 throws IOException
```
    Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
    
    Parameters:
    
    rootDirResource - the root directory as Resource
    
    subPattern - the sub pattern to match (below the root directory)
    
    Returns:
    
    a mutable Set of matching Resource instances
    
    Throws:
    
    IOException - in case of I/O errors
    
    See Also:
    
    retrieveMatchingFiles(java.io.File, java.lang.String), org.hotswap.agent.util.spring.path.springframework.util.PathMatcher
  - doFindMatchingFileSystemResources
```
protected Set<Resource> doFindMatchingFileSystemResources(File rootDir,
                                                          String subPattern)
                                                   throws IOException
```
    Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
    
    Parameters:
    
    rootDir - the root directory in the file system
    
    subPattern - the sub pattern to match (below the root directory)
    
    Returns:
    
    a mutable Set of matching Resource instances
    
    Throws:
    
    IOException - in case of I/O errors
    
    See Also:
    
    retrieveMatchingFiles(java.io.File, java.lang.String), org.hotswap.agent.util.spring.path.springframework.util.PathMatcher
  - retrieveMatchingFiles
```
protected Set<File> retrieveMatchingFiles(File rootDir,
                                          String pattern)
                                   throws IOException
```
    Retrieve files that match the given path pattern, checking the given directory and its subdirectories.
    
    Parameters:
    
    rootDir - the directory to start from
    
    pattern - the pattern to match against, relative to the root directory
    
    Returns:
    
    a mutable Set of matching Resource instances
    
    Throws:
    
    IOException - if directory contents could not be retrieved
  - doRetrieveMatchingFiles
```
protected void doRetrieveMatchingFiles(String fullPattern,
                                       File dir,
                                       Set<File> result)
                                throws IOException
```
    Recursively retrieve files that match the given pattern, adding them to the given result list.
    
    Parameters:
    
    fullPattern - the pattern to match against, with prepended root directory path
    
    dir - the current directory
    
    result - the Set of matching File instances to add to
    
    Throws:
    
    IOException - if directory contents could not be retrieved

Class PathMatchingResourcePatternResolver

Field Summary

Fields inherited from interface org.hotswap.agent.util.spring.path.ResourcePatternResolver

Fields inherited from interface org.hotswap.agent.util.spring.io.loader.ResourceLoader

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

PathMatchingResourcePatternResolver

PathMatchingResourcePatternResolver

PathMatchingResourcePatternResolver

Method Detail

getResourceLoader

getClassLoader

setPathMatcher

getPathMatcher

getResource

getResources

findAllClassPathResources

doFindAllClassPathResources

convertClassLoaderURL

addAllClassLoaderJarRoots

findPathMatchingResources

determineRootDir

resolveRootDirResource

isJarResource

doFindPathMatchingJarResources

getJarFile

doFindPathMatchingFileResources

doFindMatchingFileSystemResources

retrieveMatchingFiles

doRetrieveMatchingFiles