com.helger.commons.io.resource

Class ClassPathResource

java.lang.Object

com.helger.commons.io.resource.ClassPathResource

All Implemented Interfaces:

IHasInputStream, IHasInputStreamAndReader, IReadableResource, IResourceBase, IHasClassLoader, Serializable

@NotThreadSafe
public class ClassPathResource
extends Object
implements IReadableResource, IHasClassLoader

Wraps a class path object as a readable resource.

Author:

Philip Helger

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	CLASSPATH_PREFIX_LONG Use this prefix to uniquely identify classpath resources
static String	CLASSPATH_PREFIX_SHORT Use this prefix to uniquely identify classpath resources - alternative

Constructor Summary

Constructors

Constructor and Description
ClassPathResource(String sPath) Create a new class path resource, using the specified path.
ClassPathResource(String sPath, ClassLoader aClassLoader) Create a new class path resource using the specified path and class loader (optional).
ClassPathResource(URL aURL) Create a new class path resource, using the specified URL.
ClassPathResource(URL aURL, ClassLoader aClassLoader) Create a new class path resource using the specified URL and class loader (optional).

Method Summary

Modifier and Type	Method and Description
boolean	canRead()
boolean	canReadNoCache(ClassLoader aClassLoader)
boolean	equals(Object o)
boolean	exists()
boolean	existsNoCacheUsage()
File	getAsFile()
static File	getAsFile(String sPath) Get the file for the specified path using automatic class loader handling.
static File	getAsFile(String sPath, ClassLoader aClassLoader)
File	getAsFileNoCache(ClassLoader aClassLoader)
URL	getAsURL()
URL	getAsURLNoCache(ClassLoader aClassLoader) Convert the path to a URL without using caching.
ClassLoader	getClassLoader()
InputStream	getInputStream() Get the input stream for the specified path using automatic class loader handling.
static InputStream	getInputStream(String sPath) Get the input stream for the specified path using automatic class loader handling.
static InputStream	getInputStream(String sPath, ClassLoader aClassLoader) Get the input stream of the passed resource using the specified class loader only.
InputStream	getInputStreamNoCache(ClassLoader aClassLoader) Get the input stream to the this resource, using the passed class loader only.
String	getPath()
ClassPathResource	getReadableCloneForPath(String sPath) Get a new resource of the same implementation type as this object but for a different path.
Reader	getReaderNoCache(ClassLoader aClassLoader, Charset aCharset) Create a Reader of this resource, using the specified class loader only.
String	getResourceID()
static String	getWithoutClassPathPrefix(String sPath) Remove any leading explicit classpath resource prefixes.
int	hashCode()
static boolean	isExplicitClassPathResource(String sName) Check if the passed resource name is an explicit classpath resource.
boolean	isReadMultiple() Check if the InputStream from IHasInputStream.getInputStream() can be acquired more than once.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.helger.commons.io.IHasInputStreamAndReader

getReader

Methods inherited from interface com.helger.commons.lang.IHasClassLoader

hasClassLoader

Field Detail

CLASSPATH_PREFIX_LONG

public static final String CLASSPATH_PREFIX_LONG

Use this prefix to uniquely identify classpath resources

See Also:

Constant Field Values

CLASSPATH_PREFIX_SHORT

public static final String CLASSPATH_PREFIX_SHORT

Use this prefix to uniquely identify classpath resources - alternative

See Also:

Constant Field Values

Constructor Detail

ClassPathResource

public ClassPathResource(@Nonnull
                         URL aURL)

Create a new class path resource, using the specified URL. Class loader handling is automatic.

Parameters:

aURL - The URL to be used. May not be null.

ClassPathResource

public ClassPathResource(@Nonnull
                         URL aURL,
                         @Nullable
                         ClassLoader aClassLoader)

Create a new class path resource using the specified URL and class loader (optional).

Parameters:

aURL - The URL to be used. May not be null.

aClassLoader - The class loader to use. May be null indicating that automatic class loader handling should be applied.

ClassPathResource

public ClassPathResource(@Nonnull @Nonempty
                         String sPath)

Create a new class path resource, using the specified path. Class loader handling is automatic.

Parameters:

sPath - The path to be used. May neither be null nor empty.

ClassPathResource

public ClassPathResource(@Nonnull @Nonempty
                         String sPath,
                         @Nullable
                         ClassLoader aClassLoader)

Create a new class path resource using the specified path and class loader (optional).

Parameters:

sPath - The path to be used. May neither be null nor empty.

aClassLoader - The class loader to use. May be null indicating that automatic class loader handling should be applied.

Method Detail

getWithoutClassPathPrefix

@Nullable
public static String getWithoutClassPathPrefix(@Nullable
                                                          String sPath)

Remove any leading explicit classpath resource prefixes.

Parameters:

sPath - The source path to strip the class path prefixes from. May be null.

Returns:

null if the parameter was null.

See Also:

CLASSPATH_PREFIX_LONG, CLASSPATH_PREFIX_SHORT

isExplicitClassPathResource

public static boolean isExplicitClassPathResource(@Nullable
                                                  String sName)

Check if the passed resource name is an explicit classpath resource. This is the case, if the name starts either with CLASSPATH_PREFIX_LONG or CLASSPATH_PREFIX_SHORT.

Parameters:

sName - The name to check. May be null.

Returns:

true if the passed name is not null and an explicit classpath resource.

getClassLoader

@Nullable
public ClassLoader getClassLoader()

Specified by:

getClassLoader in interface IHasClassLoader

Returns:

The class loader to use. May be null.

getResourceID

@Nonnull
public String getResourceID()

Specified by:

getResourceID in interface IResourceBase

Returns:

A non-null resource ID used e.g. for system IDs in XML resolving.

getPath

@Nonnull
 @Nonempty
public String getPath()

Specified by:

getPath in interface IResourceBase

Returns:

The requested path. Never null

getInputStream

@Nullable
public static InputStream getInputStream(@Nonnull @Nonempty
                                                    String sPath)

Get the input stream for the specified path using automatic class loader handling. The class loaders are iterated in the following order:

1. Default class loader (usually the context class loader)
2. The class loader of this class
3. The system class loader

Parameters:

sPath - The path to be resolved. May neither be null nor empty.

Returns:

null if the path could not be resolved.

getInputStream

@Nullable
public static InputStream getInputStream(@Nonnull @Nonempty
                                                    String sPath,
                                                    @Nonnull
                                                    ClassLoader aClassLoader)

Get the input stream of the passed resource using the specified class loader only.

Parameters:

sPath - The path to be resolved. May neither be null nor empty.

aClassLoader - The class loader to be used. May not be null.

Returns:

null if the path could not be resolved using the specified class loader.

getInputStream

@Nullable
public InputStream getInputStream()

Get the input stream for the specified path using automatic class loader handling. If no class loader was specified in the constructor, the class loaders are iterated in the following order:

1. Default class loader (usually the context class loader)
2. The class loader of this class
3. The system class loader

Specified by:

getInputStream in interface IHasInputStream

Returns:

null if no such resource exists.

isReadMultiple

public final boolean isReadMultiple()

Description copied from interface: IHasInputStream

Check if the InputStream from IHasInputStream.getInputStream() can be acquired more than once.

Specified by:

isReadMultiple in interface IHasInputStream

Returns:

true if the input stream can be acquired more than once, false if not.

getInputStreamNoCache

@Nullable
public InputStream getInputStreamNoCache(@Nonnull
                                                    ClassLoader aClassLoader)

Get the input stream to the this resource, using the passed class loader only.

Parameters:

aClassLoader - The class loader to be used. May not be null.

Returns:

null if the path could not be resolved.

getReaderNoCache

@Nullable
public Reader getReaderNoCache(@Nonnull
                                          ClassLoader aClassLoader,
                                          @Nonnull
                                          Charset aCharset)

Create a Reader of this resource, using the specified class loader only.

Parameters:

aClassLoader - The class loader to be used. May not be null.

aCharset - The charset to be used for the Reader. May not be null.

Returns:

null if the path could not be resolved.

exists

public boolean exists()

Specified by:

exists in interface IResourceBase

Returns:

true if the resource exists, false otherwise.

existsNoCacheUsage

public boolean existsNoCacheUsage()

getAsURL

@Nullable
public URL getAsURL()

Specified by:

getAsURL in interface IResourceBase

Returns:

the URL representation of this resource. May be null if this resource cannot be represented as an URL.

getAsURLNoCache

@Nullable
public URL getAsURLNoCache(@Nonnull
                                      ClassLoader aClassLoader)

Convert the path to a URL without using caching. Otherwise the resolution of getAsURL() using the constructor supplied class loader would possibly contradict with this resolution.

Parameters:

aClassLoader - The class loader to be used. May not be null.

Returns:

null if the path could not be resolved to a URL

getAsFile

@Nullable
public static File getAsFile(@Nonnull @Nonempty
                                        String sPath)

Get the file for the specified path using automatic class loader handling. The class loaders are iterated in the following order:

1. Default class loader (usually the context class loader)
2. The class loader of this class
3. The system class loader

Parameters:

sPath - The path to be resolved. May neither be null nor empty.

Returns:

null if the path could not be resolved.

getAsFile

@Nullable
public static File getAsFile(@Nonnull @Nonempty
                                        String sPath,
                                        @Nonnull
                                        ClassLoader aClassLoader)

getAsFile

@Nullable
public File getAsFile()

Specified by:

getAsFile in interface IResourceBase

Returns:

the File representation of this resource. May be null if this resource cannot be represented as a file.

getAsFileNoCache

@Nullable
public File getAsFileNoCache(@Nonnull
                                        ClassLoader aClassLoader)

canRead

public boolean canRead()

canReadNoCache

public boolean canReadNoCache(@Nonnull
                              ClassLoader aClassLoader)

getReadableCloneForPath

@Nonnull
public ClassPathResource getReadableCloneForPath(@Nonnull
                                                           String sPath)

Description copied from interface: IReadableResource

Get a new resource of the same implementation type as this object but for a different path.

Specified by:

getReadableCloneForPath in interface IReadableResource

Parameters:

sPath - The new path to use. May not be null.

Returns:

The resource of the same implementation but a different path. May not be null.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object