thredds.catalog.query

Class DqcFactory

java.lang.Object

thredds.catalog.query.DqcFactory

public class DqcFactory
extends Object

Reads an XML document and constructs an QueryCapability object.

Example of normal use:

 DqcFactory fac = new DqcFactory(true);
 QueryCapability dqc = fac.readXML(url);
 System.out.println(" dqc hasFatalError= "+dqc.hasFatalError());
 System.out.println(" dqc messages= \n"+dqc.getErrorMessages());
 fac.writeXML(dqc, System.out);
 

Implementation details: Uses JAXP to load an XML Parser and construct a DOM tree. Uses a pluggable "converter" to transform the DOM to the thredds.catalog.query objects.

Author:

John Caron

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	debugURL
static boolean	debugVersion
static boolean	showParsedXML

Constructor Summary

Constructors

Constructor and Description
DqcFactory(boolean validate) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	appendErr(String err)
void	appendFatalErr(String err)
void	appendWarning(String err)
static void	main(String[] args)
QueryCapability	readXML(InputStream docIs, URI uri) Create an QueryCapability from an InputStream.
QueryCapability	readXML(String uriString) Create an QueryCapability from an XML document at a named URL.
QueryCapability	readXML(String docAsString, URI uri)
static void	setPersistenceCache(DiskCache2 dc)
String	writeXML(QueryCapability dqc) Write the catalog as an XML document to a String.
void	writeXML(QueryCapability dqc, OutputStream os) Write the catalog as an XML document to the specified stream.
boolean	writeXML(QueryCapability dqc, String filename) Write the catalog as an XML document to the specified filename.

Methods inherited from class java.lang.Object

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

Field Detail

debugURL

public static boolean debugURL

debugVersion

public static boolean debugVersion

showParsedXML

public static boolean showParsedXML

Constructor Detail

DqcFactory

public DqcFactory(boolean validate)

Constructor. Can use this to read as many catalogs as you want, but should only use in single thread.

Parameters:

validate - : do XML validation or not.

Method Detail

setPersistenceCache

public static void setPersistenceCache(DiskCache2 dc)

appendErr

public void appendErr(String err)

appendFatalErr

public void appendFatalErr(String err)

appendWarning

public void appendWarning(String err)

readXML

public QueryCapability readXML(String docAsString,
                      URI uri)
                        throws IOException

Throws:

IOException

readXML

public QueryCapability readXML(String uriString)
                        throws IOException

Create an QueryCapability from an XML document at a named URL. check dqc.isValid, dqc.getErrorMessages() to see if ok. If Disk caching is set, cache the dqc and check IfModifiedSince.

Parameters:

uriString - : the URI name that the XML doc is at.

Returns:

an QueryCapability object

Throws:

IOException - on failure

readXML

public QueryCapability readXML(InputStream docIs,
                      URI uri)
                        throws IOException

Create an QueryCapability from an InputStream. check dqc.isValid, dqc.getErrorMessages() to see if ok.

Parameters:

docIs - : the InputStream to read from

uri - : the URI of the document, used for resolving reletive references.

Returns:

an QueryCapability object

Throws:

IOException - on failure

writeXML

public String writeXML(QueryCapability dqc)
                throws IOException

Write the catalog as an XML document to a String.

Parameters:

dqc - : write this QueryCapability to an XML representation.

Returns:

string containing XML representation

Throws:

IOException - on failure

writeXML

public void writeXML(QueryCapability dqc,
            OutputStream os)
              throws IOException

Write the catalog as an XML document to the specified stream.

Parameters:

dqc - : write this QueryCapability to an XML representation.

os - write to this OutputStream

Throws:

IOException - on an error.

writeXML

public boolean writeXML(QueryCapability dqc,
               String filename)

Write the catalog as an XML document to the specified filename.

Parameters:

dqc - : write this QueryCapability to an XML representation.

filename - write to this filename

Returns:

true if success

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception