Package org.apache.tools.ant.types.resources

# Class AbstractClasspathResource

java.lang.Object
org.apache.tools.ant.ProjectComponent
org.apache.tools.ant.types.DataType
org.apache.tools.ant.types.Resource
org.apache.tools.ant.types.resources.AbstractClasspathResource

All Implemented Interfaces:
  `Cloneable`, `Comparable<Resource>`, `Iterable<Resource>`, `ResourceCollection`

Direct Known Subclasses:
  `JavaConstantResource`, `JavaResource`

public abstract class AbstractClasspathResource extends Resource
A Resource representation of anything that is accessed via a Java classloader. The core methods to set/resolve the classpath are provided.

Since:
  Ant 1.8.0

## Nested Class Summary

Nested Classes
Modifier and Type
Class
Description
`static class`
`AbstractClasspathResource.ClassLoaderWithFlag`

## Field Summary

### Fields inherited from class org.apache.tools.ant.types.Resource

`MAGIC, UNKNOWN_DATETIME, UNKNOWN_SIZE`

### Fields inherited from class org.apache.tools.ant.types.DataType

`checked, ref`

### Fields inherited from class org.apache.tools.ant.ProjectComponent

`description, location, project`

## Constructor Summary

Constructors
Constructor
Description
`AbstractClasspathResource()`

## Method Summary

Modifier and Type
Method
Description
`Path`
`createClasspath()`
Add a classpath to use when looking up a resource.
`protected void`
`dieOnCircularReference(Stack<Object> stk, Project p)`
Check to see whether any DataType we hold references to is included in the Stack (which holds all DataType instances that directly or indirectly reference this instance, including this instance itself).
`protected AbstractClasspathResource.ClassLoaderWithFlag`
`getClassLoader()`
combines the various ways that could specify a ClassLoader and potentially creates one that needs to be cleaned up when it is no longer needed so that classes can get garbage collected.
`Path`
`getClasspath()`
get the classpath used by this `LoadProperties`.
`InputStream`
`getInputStream()`
Return an InputStream for reading the contents of this Resource.
`Reference`
`getLoader()`
Get the loader.
`protected AbstractClasspathResource`
`getRef()`
Perform the check for circular references and return the referenced Resource.
`boolean`
`isExists()`
Learn whether this resource exists.
`protected abstract InputStream`
`openInputStream(ClassLoader cl)`
open the input stream from a specific classloader
`void`
`setClasspath(Path classpath)`
Set the classpath to use when looking up a resource.
`void`
`setClasspathRef(Reference r)`
Set the classpath to use when looking up a resource, given as reference to a <path> defined elsewhere
`void`
`setLoaderRef(Reference r)`
Use the reference to locate the loader.
`void`
`setParentFirst(boolean b)`
Whether to consult the parent classloader first.
`void`
`setRefid(Reference r)`
Overrides the super version.

### Methods inherited from class org.apache.tools.ant.types.Resource

`as, asOptional, clone, compareTo, equals, getLastModified, getMagicNumber, getName, getOutputStream, getSize, hashCode, isDirectory, isFilesystemOnly, iterator, setDirectory, setExists, setLastModified, setName, setSize, size, toLongString, toString`

### Methods inherited from class org.apache.tools.ant.types.DataType

`checkAttributesAllowed, checkChildrenAllowed, circularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getDataTypeName, getRefid, invokeCircularReferenceCheck, isChecked, isReference, noChildrenAllowed, pushAndInvokeCircularReferenceCheck, setChecked, tooManyAttributes`

### Methods inherited from class org.apache.tools.ant.ProjectComponent

`getDescription, getLocation, getProject, log, log, setDescription, setLocation, setProject`

### Methods inherited from class java.lang.Object

`finalize, getClass, notify, notifyAll, wait, wait, wait`

### Methods inherited from interface java.lang.Iterable

`forEach, spliterator`

### Methods inherited from interface org.apache.tools.ant.types.ResourceCollection

`isEmpty, stream`

## Constructor Details

### AbstractClasspathResource

public AbstractClasspathResource()

## Method Details

### setClasspath

public void setClasspath(Path classpath)
Set the classpath to use when looking up a resource.

Parameters:
  `classpath` - to add to any existing classpath

### createClasspath

public Path createClasspath()
Add a classpath to use when looking up a resource.

Returns:
  The classpath to be configured

### setClasspathRef

public void setClasspathRef(Reference r)
Set the classpath to use when looking up a resource, given as reference to a <path> defined elsewhere

Parameters:
  `r` - The reference value

### getClasspath

public Path getClasspath()
get the classpath used by this `LoadProperties`.

Returns:
  The classpath

### getLoader

public Reference getLoader()
Get the loader.

Returns:
  the loader.

### setLoaderRef

public void setLoaderRef(Reference r)
Use the reference to locate the loader. If the loader is not found, taskdef will use the specified classpath and register it with the specified name.

This allow multiple taskdef/typedef to use the same class loader, so they can be used together. It eliminate the need to put them in the CLASSPATH.

Parameters:
  `r` - the reference to locate the loader.

### setParentFirst

public void setParentFirst(boolean b)
Whether to consult the parent classloader first.

Only relevant if a classpath has been specified.

Parameters:
  `b` - boolean
Since:
  Ant 1.8.0

### setRefid

public void setRefid(Reference r)
Overrides the super version.

Overrides:
  `setRefid` in class `Resource`
Parameters:
  `r` - the Reference to set.

### isExists

public boolean isExists()
Learn whether this resource exists. This implementation opens the input stream as the test.

Overrides:
  `isExists` in class `Resource`
Returns:
  true if this resource exists.

### getInputStream

public InputStream getInputStream() throws IOException
Return an InputStream for reading the contents of this Resource.

Overrides:
  `getInputStream` in class `Resource`
Returns:
  an InputStream object.
Throws:
  `IOException` - if an error occurs.

### getClassLoader

protected AbstractClasspathResource.ClassLoaderWithFlag getClassLoader()
combines the various ways that could specify a ClassLoader and potentially creates one that needs to be cleaned up when it is no longer needed so that classes can get garbage collected.

Returns:
  ClassLoaderWithFlag

### openInputStream

protected abstract InputStream openInputStream(ClassLoader cl) throws IOException
open the input stream from a specific classloader

Parameters:
  `cl` - the classloader to use. Will be null if the system classloader is used
Returns:
  an open input stream for the resource
Throws:
  `IOException` - if an error occurs.

### dieOnCircularReference

protected void dieOnCircularReference(Stack<Object> stk, Project p)
Description copied from class: `DataType`
Check to see whether any DataType we hold references to is included in the Stack (which holds all DataType instances that directly or indirectly reference this instance, including this instance itself).

If one is included, throw a BuildException created by `circularReference`.

This implementation is appropriate only for a DataType that cannot hold other DataTypes as children.

The general contract of this method is that it shouldn't do anything if `DataType.checked` is true and set it to true on exit.

Overrides:
  `dieOnCircularReference` in class `DataType`
Parameters:
  `stk` - the stack of references to check.
  `p` - the project to use to dereference the references.

### getRef

protected AbstractClasspathResource getRef()
Description copied from class: `Resource`
Perform the check for circular references and return the referenced Resource.

Overrides:
  `getRef` in class `Resource`
Returns:
  `Resource`.