org.apache.sling.api.resource

Class ResourceUtil

java.lang.Object

org.apache.sling.api.resource.ResourceUtil

public class ResourceUtil
extends Object

The ResourceUtil class provides helper methods dealing with resources.

This class is not intended to be extended or instantiated because it just provides static utility methods not intended to be overwritten.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ResourceUtil.BatchResourceRemover A batch resource remover deletes resources in batches.

Constructor Summary

Constructors

Constructor and Description
ResourceUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Iterator<T>	adaptTo(Iterator<Resource> iterator, Class<T> type) Return an iterator for objects of the specified type.
static String	createUniqueChildName(Resource parent, String name) Create a unique name for a child of the parent.
static String	findResourceSuperType(Resource resource) Deprecated. Use ResourceResolver.getParentResourceType(Resource)
static ResourceUtil.BatchResourceRemover	getBatchResourceRemover(int threshold) Create a batch resource remover.
static String	getName(Resource rsrc) Deprecated. since 2.1.0, use Resource.getName() instead
static String	getName(String path) Utility method returns the name of the given path, which is normalized by normalize(String) before resolving the name.
static Resource	getOrCreateResource(ResourceResolver resolver, String path, Map<String,Object> resourceProperties, String intermediateResourceType, boolean autoCommit) Creates or gets the resource at the given path.
static Resource	getOrCreateResource(ResourceResolver resolver, String path, String resourceType, String intermediateResourceType, boolean autoCommit) Creates or gets the resource at the given path.
static Resource	getParent(Resource rsrc) Deprecated. since 2.1.0, use Resource.getParent() instead
static String	getParent(String path) Utility method returns the parent path of the given path, which is normalized by normalize(String) before resolving the parent.
static String	getParent(String path, int level) Utility method returns the ancestor's path at the given level relative to path, which is normalized by normalize(String) before resolving the ancestor.
static String	getResourceSuperType(ResourceResolver resourceResolver, String resourceType) Deprecated. Use ResourceResolver.getParentResourceType(String)
static ValueMap	getValueMap(Resource res) Returns an ValueMap object for the given Resource.
static boolean	isA(Resource resource, String resourceType) Deprecated. Use ResourceResolver.isResourceType(Resource, String)
static boolean	isNonExistingResource(Resource res) Returns true if the resource res is a non-existing resource.
static boolean	isStarResource(Resource res) Returns true if the resource res is a "star resource".
static boolean	isSyntheticResource(Resource res) Returns true if the resource res is a synthetic resource.
static Iterator<Resource>	listChildren(Resource parent) Deprecated. since 2.1.0, use Resource.listChildren() instead
static String	normalize(String path) Resolves relative path segments '.' and '..' in the absolute path.
static String	resourceTypeToPath(String type) Helper method, which returns the given resource type as returned from the Resource.getResourceType() as a relative path.
static Resource	unwrap(Resource rsrc) Unwrap the resource and return the wrapped implementation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ResourceUtil

public ResourceUtil()

Method Detail

normalize

@CheckForNull
public static String normalize(@Nonnull
                            String path)

Resolves relative path segments '.' and '..' in the absolute path. Returns null if not possible (.. points above root) or if path is not absolute.

Parameters:

path - The path to normalize

Returns:

The normalized path or null.

getParent

@CheckForNull
public static String getParent(@Nonnull
                            String path)

Utility method returns the parent path of the given path, which is normalized by normalize(String) before resolving the parent.

Parameters:

path - The path whose parent is to be returned.

Returns:

null if path is the root path ( /) or if path is a single name containing no slash (/) characters.

Throws:

IllegalArgumentException - If the path cannot be normalized by the normalize(String) method.

NullPointerException - If path is null.

getParent

public static String getParent(String path,
               int level)

Utility method returns the ancestor's path at the given level relative to path, which is normalized by normalize(String) before resolving the ancestor.

• level = 0 returns the path.
• level = 1 returns the parent of path, if it exists, null otherwise.
• level = 2 returns the grandparent of path, if it exists, null otherwise.

Parameters:

path - The path whose ancestor is to be returned.

level - The relative level of the ancestor, relative to path.

Returns:

null if path doesn't have an ancestor at the specified level.

Throws:

IllegalArgumentException - If the path cannot be normalized by the normalize(String) method or if level < 0.

NullPointerException - If path is null.

Since:

2.2 (Sling API Bundle 2.2.0)

getParent

@Deprecated
@CheckForNull
public static Resource getParent(@Nonnull
                                         Resource rsrc)

Deprecated. since 2.1.0, use Resource.getParent() instead

Utility method returns the parent resource of the resource.

Parameters:

rsrc - The resource to get the parent of.

Returns:

The parent resource or null if the rsrc is the root.

Throws:

NullPointerException - If rsrc is null.

SlingException - If an error occurs trying to get the resource object from the path.

IllegalStateException - if the resource resolver has already been closed}.

getName

@Deprecated
@Nonnull
public static String getName(@Nonnull
                                Resource rsrc)

Deprecated. since 2.1.0, use Resource.getName() instead

Utility method returns the name of the resource.

Parameters:

rsrc - The resource to get the name from.

Returns:

The name of the resource

Throws:

NullPointerException - If rsrc is null.

getName

@Nonnull
public static String getName(@Nonnull
                     String path)

Utility method returns the name of the given path, which is normalized by normalize(String) before resolving the name.

Parameters:

path - The path whose name (the last path element) is to be returned.

Returns:

The empty string if path is the root path ( /) or if path is a single name containing no slash (/) characters.

Throws:

IllegalArgumentException - If the path cannot be normalized by the normalize(String) method.

NullPointerException - If path is null.

isSyntheticResource

public static boolean isSyntheticResource(@Nonnull
                          Resource res)

Returns true if the resource res is a synthetic resource.

This method checks whether the resource is an instance of the org.apache.sling.resource.SyntheticResource class.

Parameters:

res - The Resource to check whether it is a synthetic resource.

Returns:

true if res is a synthetic resource. false is returned if res is null or not an instance of the org.apache.sling.resource.SyntheticResource class.

isStarResource

public static boolean isStarResource(@Nonnull
                     Resource res)

Returns true if the resource res is a "star resource". A star resource is a resource returned from the ResourceResolver.resolve(HttpServletRequest) whose path terminates in a /*. Generally such resource result from requests to something like /some/path/* or /some/path/*.html which may be used web applications to uniformly handle resources to be created.

This method checks whether the resource path ends with a /* indicating such a star resource.

Parameters:

res - The Resource to check whether it is a star resource.

Returns:

true if res is to be considered a star resource.

Throws:

NullPointerException - if res is null.

isNonExistingResource

public static boolean isNonExistingResource(@Nonnull
                            Resource res)

Returns true if the resource res is a non-existing resource.

This method checks the resource type of the resource to match the well-known resource type sling:nonexisting of the NonExistingResource class defined in the Sling API.

Parameters:

res - The Resource to check whether it is a non-existing resource.

Returns:

true if res is to be considered a non-existing resource.

Throws:

NullPointerException - if res is null.

listChildren

@Deprecated
@Nonnull
public static Iterator<Resource> listChildren(@Nonnull
                                                 Resource parent)

Deprecated. since 2.1.0, use Resource.listChildren() instead

Returns an Iterator of Resource objects loaded from the children of the given Resource.

This is a convenience method for ResourceResolver.listChildren(Resource).

Parameters:

parent - The Resource whose children are requested.

Returns:

An Iterator of Resource objects.

Throws:

NullPointerException - If parent is null.

IllegalStateException - if the resource resolver has already been closed}.

SlingException - If any error occurs acquiring the child resource iterator.

See Also:

ResourceResolver.listChildren(Resource)

getValueMap

@Nonnull
public static ValueMap getValueMap(Resource res)

Returns an ValueMap object for the given Resource. This method calls Resource.getValueMap(). If null is provided as the resource an empty map is returned as well.

For backward compatibility reasons the map returned is not immutable, but it is not recommend to rely on this behavior.

Parameters:

res - The Resource to adapt to the value map.

Returns:

A value map.

resourceTypeToPath

@Nonnull
public static String resourceTypeToPath(@Nonnull
                                String type)

Helper method, which returns the given resource type as returned from the Resource.getResourceType() as a relative path.

Parameters:

type - The resource type to be converted into a path

Returns:

The resource type as a path.

Since:

2.0.6 (Sling API Bundle 2.0.6)

getResourceSuperType

@Deprecated
@CheckForNull
public static String getResourceSuperType(@Nonnull
                                                  ResourceResolver resourceResolver,
                                                  String resourceType)

Deprecated. Use ResourceResolver.getParentResourceType(String)

Returns the super type of the given resource type. This method converts the resource type to a resource path by calling resourceTypeToPath(String) and uses the resourceResolver to get the corresponding resource. If the resource exists, the Resource.getResourceSuperType() method is called.

Parameters:

resourceResolver - The ResourceResolver used to access the resource whose path (relative or absolute) is given by the resourceType parameter.

resourceType - The resource type whose super type is to be returned. This type is turned into a path by calling the resourceTypeToPath(String) method before trying to get the resource through the resourceResolver.

Returns:

the super type of the resourceType or null if the resource type does not exists or returns null for its super type.

Throws:

IllegalStateException - if the resource resolver has already been closed}.

Since:

2.0.6 (Sling API Bundle 2.0.6)

findResourceSuperType

@Deprecated
@CheckForNull
public static String findResourceSuperType(@Nonnull
                                                   Resource resource)

Deprecated. Use ResourceResolver.getParentResourceType(Resource)

Returns the super type of the given resource. This method checks first if the resource itself knows its super type by calling Resource.getResourceSuperType(). If that returns null getResourceSuperType(ResourceResolver, String) is invoked with the resource type of the resource.

Parameters:

resource - The resource to return the resource super type for.

Returns:

the super type of the resource or null if no super type could be computed.

Throws:

IllegalStateException - if the resource resolver has already been closed}.

Since:

2.0.6 (Sling API Bundle 2.0.6)

isA

@Deprecated
public static boolean isA(@Nonnull
                     Resource resource,
                     String resourceType)

Deprecated. Use ResourceResolver.isResourceType(Resource, String)

Check if the resource is of the given type. This method first checks the resource type of the resource, then its super resource type and continues to go up the resource super type hierarchy. In case the type of the given resource or the given resource type starts with one of the resource resolver's search paths it is converted to a relative resource type by stripping off the resource resolver's search path before doing the comparison.

Parameters:

resource - the resource to check

resourceType - the resource type to check the resource against

Returns:

false if resource is null. Otherwise returns the result of calling Resource.isResourceType(String) with the given resourceType.

Throws:

IllegalStateException - if the resource resolver has already been closed}.

Since:

2.0.6 (Sling API Bundle 2.0.6)

adaptTo

@Nonnull
public static <T> Iterator<T> adaptTo(@Nonnull
                              Iterator<Resource> iterator,
                              Class<T> type)

Return an iterator for objects of the specified type. A new iterator is returned which tries to adapt the provided resources to the given type (using Adaptable.adaptTo(Class). If a resource in the original iterator is not adaptable to the given class, this object is skipped. This implies that the number of objects returned by the new iterator might be less than the number of resource objects.

Type Parameters:

T - The adapted type

Parameters:

iterator - A resource iterator.

type - The adapted type

Returns:

An iterator of the adapted objects

Since:

2.0.6 (Sling API Bundle 2.0.6)

getOrCreateResource

@Nonnull
public static Resource getOrCreateResource(@Nonnull
                                   ResourceResolver resolver,
                                   @Nonnull
                                   String path,
                                   String resourceType,
                                   String intermediateResourceType,
                                   boolean autoCommit)
                                    throws PersistenceException

Creates or gets the resource at the given path.

Parameters:

resolver - The resource resolver to use for creation

path - The full path to be created

resourceType - The optional resource type of the final resource to create

intermediateResourceType - THe optional resource type of all intermediate resources

autoCommit - If set to true, a commit is performed after each resource creation.

Returns:

The resource for the path.

Throws:

SlingException - If an error occurs trying to get/create the resource object from the path.

IllegalStateException - if the resource resolver has already been closed}.

PersistenceException - If a persistence error occurs.

Since:

2.3.0 (Sling API Bundle 2.4.0)

getOrCreateResource

@Nonnull
public static Resource getOrCreateResource(@Nonnull
                                   ResourceResolver resolver,
                                   @Nonnull
                                   String path,
                                   Map<String,Object> resourceProperties,
                                   String intermediateResourceType,
                                   boolean autoCommit)
                                    throws PersistenceException

Creates or gets the resource at the given path. If an exception occurs, it retries the operation up to five times if autoCommit is enabled. In this case, ResourceResolver.revert() is called on the resolver before the creation is retried.

Parameters:

resolver - The resource resolver to use for creation

path - The full path to be created

resourceProperties - The optional resource properties of the final resource to create

intermediateResourceType - THe optional resource type of all intermediate resources

autoCommit - If set to true, a commit is performed after each resource creation.

Returns:

The resource for the path.

Throws:

SlingException - If an error occurs trying to get/create the resource object from the path.

IllegalStateException - if the resource resolver has already been closed}.

PersistenceException - If a persistence error occurs.

Since:

2.3.0 (Sling API Bundle 2.4.0)

createUniqueChildName

public static String createUniqueChildName(Resource parent,
                           String name)
                                    throws PersistenceException

Create a unique name for a child of the parent. Creates a unique name and test if child already exists. If child resource with the same name exists, iterate until a unique one is found.

Parameters:

parent - The parent resource

name - The name of the child resource

Returns:

a unique non-existing name for child resource for a given parent

Throws:

PersistenceException - if it can not find unique name for child resource.

NullPointerException - if parent is null

IllegalStateException - if the resource resolver has already been closed}.

Since:

2.5 (Sling API Bundle 2.7.0)

unwrap

@Nonnull
public static Resource unwrap(@Nonnull
                      Resource rsrc)

Unwrap the resource and return the wrapped implementation.

Parameters:

rsrc - The resource to unwrap

Returns:

The unwrapped resource

Since:

2.5 (Sling API Bundle 2.7.0)

getBatchResourceRemover

@Nonnull
public static ResourceUtil.BatchResourceRemover getBatchResourceRemover(int threshold)

Create a batch resource remover. A batch resource remove can be used to delete resources in batches. Once the passed in threshold of deleted resources is reached, an intermediate commit is called on the resource resolver. In addition the batch remover deletes a resource recursively. Once all resources to delete are passed to the remover, a final commit needs to be call on the resource resolver.

Parameters:

threshold - The threshold for the intermediate saves.

Returns:

A new batch resource remover. Since 2.6