org.apache.batik.util
Class ParsedURL

java.lang.Object
  org.apache.batik.util.ParsedURL

public class ParsedURL
extends Object

A URL-like class that supports custom URI schemes and GZIP encoding.

This class is used as a replacement for URL. This is done for several reasons. First, unlike URL this class will accept and parse as much of a URL as possible, without throwing a MalformedURLException. This makes it useful for simply parsing a URL string (hence its name).

Second, it allows for extension of the URI schemes supported by the parser. Batik uses this to support the data: URL scheme (RFC2397).

Third, by default it checks the streams that it opens to see if they are GZIP compressed, and if so it automatically uncompresses them (avoiding opening the stream twice in the process).

It is worth noting that most real work is defered to the ParsedURLData class to which most methods are forwarded. This is done because it allows a constructor interface to ParsedURL (mostly for compatability with core URL), in spite of the fact that the real implemenation uses the protocol handlers as factories for protocol specific instances of the ParsedURLData class.

ParsedURL

public ParsedURL(String urlStr)

Construct a ParsedURL from the given url string.

Parameters:

urlStr - The string to try and parse as a URL

ParsedURL

public ParsedURL(URL url)

Construct a ParsedURL from the given java.net.URL instance. This is useful if you already have a valid java.net.URL instance. This bypasses most of the parsing and hence is quicker and less prone to reinterpretation than converting the URL to a string before construction.

Parameters:

url - The URL to "mimic".

ParsedURL

public ParsedURL(String baseStr,
                 String urlStr)

Construct a sub URL from two strings.

Parameters:

baseStr - The 'parent' URL. Should be complete.

urlStr - The 'sub' URL may be complete or partial. the missing pieces will be taken from the baseStr.

ParsedURL

public ParsedURL(URL baseURL,
                 String urlStr)

Construct a sub URL from a base URL and a string for the sub url.

Parameters:

baseURL - The 'parent' URL.

urlStr - The 'sub' URL may be complete or partial. the missing pieces will be taken from the baseURL.

ParsedURL

public ParsedURL(ParsedURL baseURL,
                 String urlStr)

Construct a sub URL from a base ParsedURL and a string for the sub url.

Parameters:

baseURL - The 'parent' URL.

urlStr - The 'sub' URL may be complete or partial. the missing pieces will be taken from the baseURL.

getGlobalUserAgent

public static String getGlobalUserAgent()

setGlobalUserAgent

public static void setGlobalUserAgent(String userAgent)

getHandler

public static ParsedURLProtocolHandler getHandler(String protocol)

Returns the handler for a particular protocol. If protocol is null or no match is found in the handlers map it returns the default protocol handler.

Parameters:

protocol - The protocol to get a handler for.

registerHandler

public static void registerHandler(ParsedURLProtocolHandler handler)

Registers a Protocol handler by adding it to the handlers map. If the given protocol handler returns null as it's supported protocol then it is registered as the default protocol handler.

Parameters:

handler - the new Protocol Handler to register

checkGZIP

public static InputStream checkGZIP(InputStream is)
                             throws IOException

This is a utility function others can call that checks if is is a GZIP stream if so it returns a GZIPInputStream that will decode the contents, otherwise it returns (or a buffered version of is) untouched.

Parameters:

is - Stream that may potentially be a GZIP stream.

Throws:

IOException

toString

public String toString()

Return a string rep of the URL (can be passed back into the constructor if desired).

Overrides:

toString in class Object

getPostConnectionURL

public String getPostConnectionURL()

Returns the URL that was ultimately used to fetch the resource represented by this ParsedURL. For HTTP URLs, this will result in the post-redirect URL being returned. If there was no redirect, or if this isn't an HTTP URL, the original URL is returned (the same string as toString()).

equals

public boolean equals(Object obj)

Implement Object.equals. Relies heavily on the contained ParsedURLData's implementation of equals.

Overrides:

equals in class Object

hashCode

public int hashCode()

Implement Object.hashCode. Relies on the contained ParsedURLData's implementation of hashCode.

Overrides:

hashCode in class Object

complete

public boolean complete()

Returns true if the URL looks well formed and complete. This does not guarantee that the stream can be opened but is a good indication that things aren't totally messed up.

getUserAgent

public String getUserAgent()

Return the user agent current associated with this url (or null if none).

setUserAgent

public void setUserAgent(String userAgent)

Sets the user agent associated with this url (null clears any associated user agent).

getProtocol

public String getProtocol()

Returns the protocol for this URL. The protocol is everything upto the first ':'.

getHost

public String getHost()

Returns the host for this URL, if any, null if there isn't one or it doesn't make sense for the protocol.

getPort

public int getPort()

Returns the port on the host to connect to, if it was specified in the url that was parsed, otherwise returns -1.

getPath

public String getPath()

Returns the path for this URL, if any (where appropriate for the protocol this also includes the file, not just directory). Note that getPath appears in JDK 1.3 as a synonym for getFile from JDK 1.2.

getRef

public String getRef()

Returns the 'fragment' reference in the URL.

getPortStr

public String getPortStr()

Returns the URL up to and include the port number on the host. Does not include the path or fragment pieces.

getContentType

public String getContentType()

Returns the content type if available. This is only available for some protocols.

getContentTypeMediaType

public String getContentTypeMediaType()

Returns the content type's type/subtype, if available. This is only available for some protocols.

getContentTypeCharset

public String getContentTypeCharset()

Returns the content type's charset parameter, if available. This is only available for some protocols.

hasContentTypeParameter

public boolean hasContentTypeParameter(String param)

Returns whether the Content-Type header has the given parameter.

getContentEncoding

public String getContentEncoding()

Returns the content encoding if available. This is only available for some protocols.

openStream

public InputStream openStream()
                       throws IOException

Attempt to open the stream checking for common compression types, and automatically decompressing them if found.

Throws:

IOException

openStream

public InputStream openStream(String mimeType)
                       throws IOException

Attempt to open the stream checking for common compression types, and automatically decompressing them if found.

Parameters:

mimeType - The expected mime type of the content in the returned InputStream (mapped to Http accept header among other possibilities).

Throws:

IOException

openStream

public InputStream openStream(String[] mimeTypes)
                       throws IOException

Attempt to open the stream checking for common compression types, and automatically decompressing them if found.

Parameters:

mimeTypes - The expected mime types of the content in the returned InputStream (mapped to Http accept header among other possabilities).

Throws:

IOException

openStream

public InputStream openStream(Iterator mimeTypes)
                       throws IOException

Attempt to open the stream checking for common compression types, and automatically decompressing them if found.

Parameters:

mimeTypes - The expected mime types of the content in the returned InputStream (mapped to Http accept header among other possabilities). The elements of the iterator must be strings.

Throws:

IOException

openStreamRaw

public InputStream openStreamRaw()
                          throws IOException

Attempt to open the stream, does no checking for compression types.

Throws:

IOException

openStreamRaw

public InputStream openStreamRaw(String mimeType)
                          throws IOException

Attempt to open the stream, does no checking for compression types.

Parameters:

mimeType - The expected mime type of the content in the returned InputStream (mapped to Http accept header among other possabilities).

Throws:

IOException

openStreamRaw

public InputStream openStreamRaw(String[] mimeTypes)
                          throws IOException

Attempt to open the stream, does no checking for comression types.

Parameters:

mimeTypes - The expected mime types of the content in the returned InputStream (mapped to Http accept header among other possabilities).

Throws:

IOException

openStreamRaw

public InputStream openStreamRaw(Iterator mimeTypes)
                          throws IOException

Attempt to open the stream, does no checking for comression types.

Parameters:

mimeTypes - The expected mime types of the content in the returned InputStream (mapped to Http accept header among other possabilities). The elements of the iterator must be strings.

Throws:

IOException

sameFile

public boolean sameFile(ParsedURL other)

getProtocol

protected static String getProtocol(String urlStr)

Parse out the protocol from a url string. Used internally to select the proper handler, all other parsing is done by the selected protocol handler.

parseURL

public static ParsedURLData parseURL(String urlStr)

Factory method to construct an appropriate subclass of ParsedURLData

Parameters:

urlStr - the string to parse.

parseURL

public static ParsedURLData parseURL(String baseStr,
                                     String urlStr)

Factory method to construct an appropriate subclass of ParsedURLData, for a sub url.

Parameters:

baseStr - The base URL string to parse.

urlStr - the sub URL string to parse.

parseURL

public static ParsedURLData parseURL(ParsedURL baseURL,
                                     String urlStr)

Factory method to construct an appropriate subclass of ParsedURLData, for a sub url.

Parameters:

baseURL - The base ParsedURL to parse.

urlStr - the sub URL string to parse.