#99 added mustBeValid method to Any class

src/main/java/com/jsoniter/any/Any.java

@@ -181,6 +181,14 @@ public int size() {
         return 0;
     }
 
+    public Any mustBeValid() {
+        if(this instanceof NotFoundAny) {
+            throw ((NotFoundAny) this).exception;
+        } else {
+            return this;
+        }
+    }
+
     public Set<String> keys() {
         return EMPTY_KEYS;
     }

src/main/java/com/jsoniter/any/NotFoundAny.java

@@ -9,7 +9,7 @@
 
 class NotFoundAny extends Any {
 
-    private final JsonException exception;
+    protected final JsonException exception;
 
     public NotFoundAny(Object[] keys, int idx, Object obj) {
         this.exception = new JsonException(String.format("Value not found: failed to get path %s, because #%s section of the path ( %s ) not found in %s",

src/test/java/com/jsoniter/output/TestAny.java

@@ -2,13 +2,19 @@
 
 import com.jsoniter.ValueType;
 import com.jsoniter.any.*;
+import com.jsoniter.spi.JsonException;
 import junit.framework.TestCase;
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
 
 import java.util.Arrays;
 import java.util.HashMap;
 
 public class TestAny extends TestCase {
 
+    @Rule
+    public final ExpectedException exception = ExpectedException.none();
+
     static {
 //        JsonStream.setMode(EncodingMode.DYNAMIC_MODE);
     }
@@ -120,6 +126,12 @@ public void test_array() {
         assertEquals("[1,2,3]", any.toString());
     }
 
+    public void test_not_found() {
+        Any any = Any.wrap(new int[]{1, 2, 3});
+        exception.expect(JsonException.class);
+        any.get("not", "found", "path");
+    }
+
     public void skip_map() {
         HashMap<String, Object> val = new HashMap<String, Object>();
         val.put("hello", 1);