Package net.sf.saxon.resource

Class CatalogCollection

java.lang.Object

net.sf.saxon.resource.AbstractResourceCollection

net.sf.saxon.resource.CatalogCollection

All Implemented Interfaces:

ResourceCollection

public class CatalogCollection
extends AbstractResourceCollection

A resource collection implemented by means of a catalog file.

An example catalog file would be:

 
 <collection stable="true">
    <doc href="dir/contents.json"/>
    <doc href="dir/chap1.xml"/>
    <doc href="dir/chap2.xml"/>
    <doc href="dir/chap3.xml"/>
    <doc href="dir/chap4.xml"/>
    <doc href="dir/index.json"/>
 </collection>
 
 

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.resource.AbstractResourceCollection

AbstractResourceCollection.InputDetails

Field Summary

Fields inherited from class net.sf.saxon.resource.AbstractResourceCollection

collectionURI, config, noExceptions, params

Constructor Summary

Constructors

Constructor	Description
CatalogCollection(Configuration config, String collectionURI)	Create a catalog collection

Method Summary

Modifier and Type	Method	Description
protected Iterator<String>	catalogContents(String href, XPathContext context)	Return a collection defined as a list of URIs in a catalog file
Iterator<? extends Resource>	getResources(XPathContext context)	Get the resources in the collection.
Iterator<String>	getResourceURIs(XPathContext context)	Get the URIs of the resources in the collection.
boolean	isStable(XPathContext context)	Ask whether the collection is stable.
static String	makeStringFromStream(InputStream input, String encoding)	Return a String initialized to the contents of an InputStream

Methods inherited from class net.sf.saxon.resource.AbstractResourceCollection

checkNotNull, getCollectionURI, getInputDetails, guessContentTypeFromContent, guessContentTypeFromName, makeResource, makeResource, makeTypedResource, optionsFromQueryParameters, registerContentType, setupErrorHandlingForCollection, stripWhitespace

Methods inherited from class java.lang.Object

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

Constructor Details

CatalogCollection

public CatalogCollection(Configuration config,
 String collectionURI)

Create a catalog collection

Parameters:

config - the Saxon Configuration

collectionURI - the collection URI, which represents the location of the catalog file

Method Details

getResourceURIs

public Iterator<String> getResourceURIs(XPathContext context)
                                 throws XPathException

Description copied from interface: ResourceCollection

Get the URIs of the resources in the collection. This supports the fn:uri-collection() function. It is not required that all collections expose a list of URIs in this way, or that the URIs bear any particular relationship to the resources returned by the getResources() method for the same collection URI. The URIs that are returned should be suitable for passing to the registered URIResolver (in the case of XML resources), or the UnparsedTextURIResolver (in the case of unparsed text and JSON resources), etc.

Parameters:

context - the XPath evaluation context

Returns:

an iterator over the URIs of the resources in the collection. The URIs are represented as Strings. They should preferably be absolute URIs.

Throws:

XPathException - in the event of any error (for example, if the collection URI is not recognized)

getResources

public Iterator<? extends Resource> getResources(XPathContext context)
                                          throws XPathException

Description copied from interface: ResourceCollection

Get the resources in the collection. This supports the fn:collection() function. It is not required that all collections expose a set of resources in this way, or that the resources returned bear any particular relationship to the URIs returned by the getResourceURIs() method for the same collection URI.

Parameters:

context - the XPath evaluation context

Returns:

an iterator over the resources in the collection. This returns objects of class Resource.

Throws:

XPathException - in the event of any error (for example, if the collection URI is not recognized)

isStable

public boolean isStable(XPathContext context)

Description copied from class: AbstractResourceCollection

Ask whether the collection is stable. This method should only be called after calling ResourceCollection.getResources(XPathContext) or ResourceCollection.getResourceURIs(XPathContext)

Specified by:

isStable in interface ResourceCollection

Overrides:

isStable in class AbstractResourceCollection

Parameters:

context - the XPath evaluation context.

Returns:

true if the collection is defined to be stable, that is, if a subsequent call on collection() with the same URI is guaranteed to return the same result. The method returns true if the query parameter stable=yes is present in the URI, or if the configuration property FeatureKeys.STABLE_COLLECTION_URI is set.

makeStringFromStream

public static String makeStringFromStream(InputStream input,
 String encoding)
                                   throws IOException

Return a String initialized to the contents of an InputStream

Parameters:

input - the input stream (which is consumed by this method)

encoding - the character encoding of the input stream

Returns:

the String, initialized to the contents of this InputStream

Throws:

IOException - if an error occurs reading the resource

catalogContents

protected Iterator<String> catalogContents(String href,
 XPathContext context)
                                    throws XPathException

Return a collection defined as a list of URIs in a catalog file

Parameters:

href - the absolute URI of the catalog file

context - the dynamic evaluation context

Returns:

an iterator over the documents in the collection

Throws:

XPathException - if any failures occur