X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.api%2Fsrc%2Forg%2Fargeo%2Fapi%2Fgcr%2FContent.java;h=b2fc3c9063a37f156135f5efb078e7a7eb18a850;hb=ff7bbd1653479139bbca09ceb5d80718be027a33;hp=b032aa7b888020dce1779b34d0434ee36613fd28;hpb=b067bbdda588e7e1d592417431718b761740a305;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.api/src/org/argeo/api/gcr/Content.java b/org.argeo.api/src/org/argeo/api/gcr/Content.java
index b032aa7b8..b2fc3c906 100644
--- a/org.argeo.api/src/org/argeo/api/gcr/Content.java
+++ b/org.argeo.api/src/org/argeo/api/gcr/Content.java
@@ -11,15 +11,19 @@ public interface Content extends Iterable<Content>, Map<String, Object> {
 
 //	Iterable<String> keys();
 
-	<A> A get(String key, Class<A> clss);
+	<A> A get(String key, Class<A> clss) throws IllegalArgumentException;
 
 //	ContentSession getSession();
 
 	/*
 	 * DEFAULT METHODS
 	 */
-	default <A> A adapt(Class<A> clss) {
-		return null;
+	default <A> A adapt(Class<A> clss) throws IllegalArgumentException {
+		throw new IllegalArgumentException("Cannot adapt content " + this + " to " + clss.getName());
+	}
+
+	default <C extends AutoCloseable> C open(Class<C> clss) throws Exception, IllegalArgumentException {
+		throw new IllegalArgumentException("Cannot open content " + this + " as " + clss.getName());
 	}
 
 	/*