gpclient: Adding TypeMismatchException

Author: gcarcassi

gpclient/gpclient-core/src/main/java/org/epics/gpclient/TypeMismatchException.java

@@ -0,0 +1,36 @@
+/**
+ * Copyright information and license terms for this software can be
+ * found in the file LICENSE.TXT included with the distribution.
+ */
+package org.epics.gpclient;
+
+/**
+ * Exception thrown when a channel or an expression cannot return the type
+ * requested.
+ *
+ * @author carcassi
+ */
+public class TypeMismatchException extends RuntimeException {
+
+    /**
+     * Creates a new exception with the given message.
+     * 
+     * @param message the message
+     */
+    public TypeMismatchException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new exception with the given message and cause.
+     * 
+     * @param message the message
+     * @param cause the cause
+     */
+    public TypeMismatchException(String message, Throwable cause) {
+        super(message, cause);
+    }
+    
+    
+    
+}

gpclient/gpclient-core/src/main/java/org/epics/gpclient/datasource/DataSourceTypeSupport.java

@@ -8,6 +8,7 @@
 import java.util.Collection;
 import java.util.List;
 import org.epics.gpclient.ReadCollector;
+import org.epics.gpclient.TypeMismatchException;
 
 /**
  * The type support for a datasource. This optional class is provided to help
@@ -42,7 +43,7 @@ protected <C, T extends DataSourceTypeAdapter<? super C,?>> T find(Collection<T>
         }
 
         if (matchedConverters.size() != 1) {
-            throw new IllegalStateException(formatMessage(cache, connection, matchedConverters));
+            throw new TypeMismatchException(formatMessage(cache, connection, matchedConverters));
         }
 
         return matchedConverters.get(0);

gpclient/gpclient-core/src/main/java/org/epics/gpclient/datasource/MultiplexedChannelHandler.java

@@ -10,6 +10,7 @@
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import org.epics.gpclient.ReadCollector;
+import org.epics.gpclient.TypeMismatchException;
 import org.epics.gpclient.WriteCollector;
 
 /**
@@ -197,7 +198,7 @@ public void updateCache(ReadCollector cache, Object connection, Object message)
                 if (message == null || cache.getType().isInstance(message)) {
                     cache.updateValue(message);
                 } else {
-                    throw new IllegalArgumentException("Payload " + message + " does not match " + cache.getType().getSimpleName());
+                    throw new TypeMismatchException("Payload " + message + " does not match " + cache.getType().getSimpleName());
                 }
             }
         };