net.sf.jguiraffe.locators
Class ByteArrayLocator

java.lang.Object
  net.sf.jguiraffe.locators.AbstractLocator
      net.sf.jguiraffe.locators.AbstractStreamLocator
          net.sf.jguiraffe.locators.ByteArrayLocator

All Implemented Interfaces:

Locator

public class ByteArrayLocator
extends AbstractStreamLocator

A specialized Locator implementation that provides access to data stored in memory as a byte array.

This locator can be initialized either with a byte array or with a string. This data is kept in memory. The locator returns a stream or an URL providing access to exactly this data.

This class is especially useful for providing access to small amounts of data to clients that can deal with locators. It can also be of value for unit tests supporting an easy way of defining test data.

Instances are created using one of the static getInstance() factory methods. This class is thread-safe and can be used concurrently by multiple threads. Each invocation of getInputStream() returns a new stream instance initialized with the data of this locator.

Version:

$Id: ByteArrayLocator.java 156 2009-03-03 21:04:47Z oheger $

Author:

Oliver Heger

Method Summary

protected java.net.URL	createURL(java.net.URLStreamHandler streamHandler) Creates a URL representing the data of this locator.
boolean	equals(java.lang.Object obj) Compares this object with another one.
java.io.InputStream	getInputStream() Returns an input stream for the data of this locator.
static ByteArrayLocator	getInstance(byte[] data) Creates an instance of ByteArrayLocator that is initialized with the specified data.
static ByteArrayLocator	getInstance(java.lang.String data) Creates an instance of ByteArrayLocator that is initialized with the data of the specified string.
int	hashCode() Returns a hash code for this object.
java.lang.String	toString() Returns a string representation for this object.

Methods inherited from class net.sf.jguiraffe.locators.AbstractStreamLocator

getURL

Methods inherited from class net.sf.jguiraffe.locators.AbstractLocator

getFile

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static ByteArrayLocator getInstance(byte[] data)

Creates an instance of ByteArrayLocator that is initialized with the specified data.

Parameters:

data - the data for the locator (must not be null)

Returns:

the locator instance pointing to this data

Throws:

java.lang.IllegalArgumentException - if the data is null

getInstance

public static ByteArrayLocator getInstance(java.lang.String data)

Creates an instance of ByteArrayLocator that is initialized with the data of the specified string.

Parameters:

data - the data for the locator (must not be null)

Returns:

the locator instance pointing to this data

Throws:

java.lang.IllegalArgumentException - if the data is null

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException

Returns an input stream for the data of this locator. This implementation creates a stream that allows reading the data this locator points to in memory.

Specified by:

getInputStream in interface Locator

Overrides:

getInputStream in class AbstractLocator

Returns:

the input stream for this locator

Throws:

java.io.IOException - if an error occurs

equals

public boolean equals(java.lang.Object obj)

Compares this object with another one. Two instances of this class are considered equal if and only if the data arrays they point to are equal.

Overrides:

equals in class java.lang.Object

Parameters:

obj - the object to compare to

Returns:

a flag whether these objects are equal

hashCode

public int hashCode()

Returns a hash code for this object.

Overrides:

hashCode in class java.lang.Object

Returns:

a hash code for this object

toString

public java.lang.String toString()

Returns a string representation for this object. This string will contain (at least parts of) the data this locator points to. If the data array contains too many elements, only an excerpt of the data is printed out.

Overrides:

toString in class java.lang.Object

Returns:

a string for this object

createURL

protected java.net.URL createURL(java.net.URLStreamHandler streamHandler)
                          throws java.net.MalformedURLException

Creates a URL representing the data of this locator. This implementation creates a URL with the protocol 'data' and a hash value of the data as host.

Specified by:

createURL in class AbstractStreamLocator

Parameters:

streamHandler - the stream handler to use for this URL

Returns:

the URL representing the data of this locator

Throws:

java.net.MalformedURLException - if the URL cannot be created