Merge pull request #20 from epics-base/Issue_9

Issue #9

Author: shroffk

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

@@ -44,7 +44,7 @@
  * @author carcassi
  * @param <T> the type of the PVReader.
  */
-public interface PVReader<T> {
+public interface PVReader<T> extends AutoCloseable {
 
     /**
      * Returns the current value of the PVReader.

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

@@ -17,7 +17,7 @@
  * @param <T> type of the write payload
  * @author carcassi
  */
-public interface PVWriter<T> {
+public interface PVWriter<T> extends AutoCloseable {
 
     /**
      * Writes a new value asynchronously using the default callback. The result

pvDataJava/src/org/epics/pvdata/factory/BasePVStructureArray.java

@@ -76,12 +76,14 @@ public int get(int offset, int len, StructureArrayData data) {
     @Override
     public int put(int offset, int len, PVStructure[] from, int fromOffset) {
 
-    	// first check if all the PVStructure-s are of the right type
+    	// first check if the PVStructure-s being written are of the right type
     	Structure elementField = structureArray.getStructure();
-    	for (PVStructure pvs : from)
-    		if (pvs != null && !pvs.getStructure().equals(elementField))
-    			throw new IllegalStateException("element is not a compatible structure");
 
+    	for (int i = 0; i < len; i++) {
+    	    PVStructure pvs = from[i];
+    	    if (pvs != null && !pvs.getStructure().equals(elementField))
+                throw new IllegalStateException("element is not a compatible structure");
+        }
     	return internalPut(offset, len, from, fromOffset);
     }