Introduce namespace support

[lgpl/argeo-commons.git] / org.argeo.api / src / org / argeo / api / gcr / spi / ProvidedSession.java

diff --git a/org.argeo.api/src/org/argeo/api/gcr/spi/ProvidedSession.java b/org.argeo.api/src/org/argeo/api/gcr/spi/ProvidedSession.java
new file mode 100644 (file)
index 0000000..4e93684
--- /dev/null
+++ b/org.argeo.api/src/org/argeo/api/gcr/spi/ProvidedSession.java
@@ -0,0 +1,68 @@
+package org.argeo.api.gcr.spi;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.Set;
+
+import javax.xml.XMLConstants;
+import javax.xml.namespace.NamespaceContext;
+
+import org.argeo.api.gcr.ContentNameSupplier;
+import org.argeo.api.gcr.ContentSession;
+
+public interface ProvidedSession extends ContentSession, NamespaceContext {
+       ProvidedRepository getRepository();
+
+       /*
+        * NAMESPACE CONTEXT
+        */
+       /** @return the bound namespace or null if not found */
+       String findNamespace(String prefix);
+
+       // TODO find the default prefix?
+       Set<String> findPrefixes(String namespaceURI);
+
+       /** To be overridden for optimisation, as it will be called a lot */
+       default String findPrefix(String namespaceURI) {
+               Set<String> prefixes = findPrefixes(namespaceURI);
+               if (prefixes.isEmpty())
+                       return null;
+               return prefixes.iterator().next();
+       }
+
+       @Override
+       default String getNamespaceURI(String prefix) {
+               String namespaceURI = ContentNameSupplier.getStandardNamespaceURI(prefix);
+               if (namespaceURI != null)
+                       return namespaceURI;
+               if (XMLConstants.DEFAULT_NS_PREFIX.equals(prefix))
+                       return XMLConstants.NULL_NS_URI;
+               namespaceURI = findNamespace(prefix);
+               if (namespaceURI != null)
+                       return namespaceURI;
+               return XMLConstants.NULL_NS_URI;
+       }
+
+       @Override
+       default String getPrefix(String namespaceURI) {
+               String prefix = ContentNameSupplier.getStandardPrefix(namespaceURI);
+               if (prefix != null)
+                       return prefix;
+               if (XMLConstants.NULL_NS_URI.equals(namespaceURI))
+                       return XMLConstants.DEFAULT_NS_PREFIX;
+               return findPrefix(namespaceURI);
+       }
+
+       @Override
+       default Iterator<String> getPrefixes(String namespaceURI) {
+               Iterator<String> standard = ContentNameSupplier.getStandardPrefixes(namespaceURI);
+               if (standard != null)
+                       return standard;
+               if (XMLConstants.NULL_NS_URI.equals(namespaceURI))
+                       return Collections.singleton(XMLConstants.DEFAULT_NS_PREFIX).iterator();
+               Set<String> prefixes = findPrefixes(namespaceURI);
+               assert prefixes != null;
+               return prefixes.iterator();
+       }
+
+}