public class CatalogFeatures extends Object
Feature | Description | Property Name | System Property [1] | Value [2] | Action | |
---|---|---|---|---|---|---|
Type | Value | |||||
FILES | A semicolon-delimited list of URIs to locate the catalog files. The URIs must be absolute and have a URL protocol handler for the URI scheme. | javax.xml.catalog.files | javax.xml.catalog.files | String | URIs | Reads the first catalog as the current catalog; Loads others if no match is found in the current catalog including delegate catalogs if any. |
PREFER | Indicates the preference between the public and system identifiers. The default value is public [3]. | javax.xml.catalog.prefer | N/A | String | system | Searches system entries for a match; Searches public entries when external identifier specifies only a public identifier |
public | Searches system entries for a match; Searches public entries when there is no matching system entry. | |||||
DEFER | Indicates that the alternative catalogs including those specified in delegate entries or nextCatalog are not read until they are needed. The default value is true. | javax.xml.catalog.defer [4] | javax.xml.catalog.defer | String | true | Loads alternative catalogs as needed. |
false | Loads all catalogs[5]. | |||||
RESOLVE | Determines the action if there is no matching entry found after all of the specified catalogs are exhausted. The default is strict. | javax.xml.catalog.resolve [4] | javax.xml.catalog.resolve | String | strict | Throws CatalogException if there is no match. |
continue | Allows the XML parser to continue as if there is no match. | |||||
ignore | Tells the XML parser to skip the external references if there no match. |
[1] There is no System property for the features that marked as "N/A".
[2] The value shall be exactly as listed in this table, case-sensitive. Any unspecified value will result in IllegalArgumentException
.
[3] The Catalog specification defined complex rules on the prefer attribute. Although the prefer can be public or system, the specification actually made system the preferred option, that is, no matter the option, a system entry is always used if found. Public entries are only considered if the prefer is public and system entries are not found. It is therefore recommended that the prefer attribute be set as public (which is the default).
[4] Although non-standard attributes in the OASIS Catalog specification, defer
and resolve
are recognized by the Java Catalog API the same as the prefer
as being an attribute in the catalog entry of the main catalog. Note that only the attributes specified for the catalog entry of the main Catalog file will be used.
[5] If the intention is to share an entire catalog store, it may be desirable to set the property javax.xml.catalog.defer
to false to allow the entire catalog to be pre-loaded.
prefer
attribute is set in the catalog file as in <catalog prefer="public">
, any other input for the "prefer" property is not necessary or will be ignored. A CatalogFeatures instance can be created through its builder as illustrated in the following sample code:
CatalogFeatures f = CatalogFeatures.builder()
.with(Feature.FILES, "file:///etc/xml/catalog")
.with(Feature.PREFER, "public")
.with(Feature.DEFER, "true")
.with(Feature.RESOLVE, "ignore")
.build();
javax.xml.parsers
), and StAX parsers (javax.xml.stream
), Schema Validation (javax.xml.validation
), and XML Transformation (javax.xml.transform
). The features described above can be set through JAXP factories or processors that define a setProperty or setAttribute interface. For example, the following code snippet sets a URI to a catalog file on a SAX parser through the javax.xml.catalog.files
property:
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setFeature(XMLConstants.USE_CATALOG, true); [1]
SAXParser parser = spf.newSAXParser();
parser.setProperty(CatalogFeatures.Feature.FILES.getPropertyName(), "file:///etc/xml/catalog");
[1] Note that this statement is not required since the default value of USE_CATALOG
is true.
The JAXP Processors' support for Catalog depends on both the USE_CATALOG
feature and the existence of valid Catalog file(s). A JAXP processor will use the Catalog only when the feature is true and valid Catalog file(s) are specified through the javax.xml.catalog.files
property. It will make no attempt to use the Catalog if either USE_CATALOG
is set to false, or there is no Catalog file specified.
The JAXP processors will observe the default settings of the CatalogFeatures
. The processors, for example, will report an Exception by default when no matching entry is found since the default value of the javax.xml.catalog.resolve
property is strict.
The JAXP processors give preference to user-specified custom resolvers. If such a resolver is registered, it will be used over the CatalogResolver. If it returns null however, the processors will continue resolving with the CatalogResolver. If it returns an empty source, no attempt will be made by the CatalogResolver.
The Catalog support is available for any process in the JAXP library that supports a resolver. The following table lists all such processes.
Process | Catalog Entry Type | Example |
---|---|---|
DTDs and external entities | public, system | The following DTD reference: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> Can be resolved using the following Catalog entry: <public publicId="-//W3C//DTD XHTML 1.0 Strict//EN" uri="catalog/xhtml1-strict.dtd"/> or <systemSuffix systemIdSuffix="html1-strict.dtd" uri="catalog/xhtml1-strict.dtd"/> |
XInclude | uri | The following XInclude element: <xi:include href="https://openjdk.org/xml/disclaimer.xml"/> can be resolved using a URI entry: <uri name="https://openjdk.org/xml/disclaimer.xml" uri="file:///pathto/local/disclaimer.xml"/> or <uriSuffix uriSuffix="disclaimer.xml" uri="file:///pathto/local/disclaimer.xml"/> |
XSD import | uri | The following import element: <xsd:import namespace="https://openjdk.org/xsd/XSDImport_person" schemaLocation="https://openjdk.org/xsd/XSDImport_person.xsd"/> can be resolved using a URI entry: <uri name="https://openjdk.org/xsd/XSDImport_person.xsd" uri="file:///pathto/local/XSDImport_person.xsd"/> or <uriSuffix uriSuffix="XSDImport_person.xsd" uri="file:///pathto/local/XSDImport_person.xsd"/> or <uriSuffix uriSuffix="https://openjdk.org/xsd/XSDImport_person" uri="file:///pathto/local/XSDImport_person.xsd"/> |
XSD include | uri | The following include element: <xsd:include schemaLocation="https://openjdk.org/xsd/XSDInclude_person.xsd"/> can be resolved using a URI entry: <uri name="https://openjdk.org/xsd/XSDInclude_person.xsd" uri="file:///pathto/local/XSDInclude_person.xsd"/> or <uriSuffix uriSuffix="XSDInclude_person.xsd" uri="file:///pathto/local/XSDInclude_person.xsd"/> |
XSL import and include | uri | The following include element: <xsl:include href="https://openjdk.org/xsl/include.xsl"/> can be resolved using a URI entry: <uri name="https://openjdk.org/xsl/include.xsl" uri="file:///pathto/local/include.xsl"/> or <uriSuffix uriSuffix="include.xsl" uri="file:///pathto/local/include.xsl"/> |
XSL document function | uri | The document in the following element: <xsl:variable name="dummy" select="document('https://openjdk.org/xsl/list.xml')"/> can be resolved using a URI entry: <uri name="https://openjdk.org/xsl/list.xml" uri="file:///pathto/local/list.xml"/> or <uriSuffix uriSuffix="list.xml" uri="file:///pathto/local/list.xml"/> |
Modifier and Type | Class | Description |
---|---|---|
static class |
CatalogFeatures.Builder |
The Builder class for building the CatalogFeatures object. |
static enum |
CatalogFeatures.Feature |
A Feature type as defined in the Catalog Features table. |
Modifier and Type | Method | Description |
---|---|---|
static CatalogFeatures.Builder |
builder() |
Returns an instance of the builder for creating the CatalogFeatures object. |
static CatalogFeatures |
defaults() |
Returns a CatalogFeatures instance with default settings. |
String |
get |
Returns the value of the specified feature. |
public static CatalogFeatures defaults()
public String get(CatalogFeatures.Feature cf)
cf
- the type of the Catalog featurepublic static CatalogFeatures.Builder builder()
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