1 files changed, 74 insertions, 0 deletions
diff --git a/qpid/java/tasks/src/org/apache/qpid/tasks/BaseTask.java b/qpid/java/tasks/src/org/apache/qpid/tasks/BaseTask.java
new file mode 100644
index 0000000000..be604b14cf
--- /dev/null
+++ b/qpid/java/tasks/src/org/apache/qpid/tasks/BaseTask.java
@@ -0,0 +1,74 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.tasks;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Task;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * BaseTask -- an abstract base task for blaze specific tasks.
+ **/
+
+public abstract class BaseTask extends Task {
+
+    private static Set EMPTY = new HashSet();
+    {
+        EMPTY.add(0);
+        EMPTY.add("");
+    }
+
+    public static class Validator {
+
+        private String name;
+        private Object value;
+
+        private  Validator(String name, Object value) {
+            this.name = name;
+            this.value = value;
+        }
+
+        public Validator required() {
+            if (value == null) {
+                error("value is required");
+            }
+            return this;
+        }
+
+        public Validator nonempty() {
+            if (EMPTY.contains(value)) {
+                error("value is empty");
+            }
+            return this;
+        }
+
+        private void error(String msg) {
+            throw new BuildException(name + ": " + msg);
+        }
+    }
+
+    public Validator validate(String name, Object value) {
+        return new Validator(name, value);
+    }
+
+}