svn commit: r985450 - in /incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator: ./ ChainTaskValidator.java

[ja...@apache.org]

Author: javier
Date: Sat Aug 14 09:27:40 2010
New Revision: 985450

URL: http://svn.apache.org/viewvc?rev=985450&view=rev
Log:
Allow multiple task validation. DROIDS-93

Added:
    incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/
    incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/ChainTaskValidator.java

Added: incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/ChainTaskValidator.java
URL: http://svn.apache.org/viewvc/incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/ChainTaskValidator.java?rev=985450&view=auto
==============================================================================
--- incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/ChainTaskValidator.java (added)
+++ incubator/droids/trunk/droids-core/src/main/java/org/apache/droids/validator/ChainTaskValidator.java Sat Aug 14 09:27:40 2010
@@ -0,0 +1,55 @@
+/*
+ * 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.droids.validator;
+
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.apache.droids.api.Task;
+import org.apache.droids.api.TaskValidator;
+import org.apache.droids.exception.InvalidTaskException;
+
+/**
+ * A chain task validator executes a chain of unique validators
+ */
+public final class ChainTaskValidator<T extends Task> implements
+    TaskValidator<T> {
+  private final Set<TaskValidator<T>> validatorChain;
+
+  public ChainTaskValidator() {
+    super();
+
+    this.validatorChain = new LinkedHashSet<TaskValidator<T>>();
+  }
+
+  public final T validateTask(final T task) throws InvalidTaskException {
+    T currentResult = task;
+    for (final TaskValidator<T> taskValidator : this.validatorChain) {
+      currentResult = taskValidator.validateTask(currentResult);
+      if (currentResult == null) {
+        break;
+      }
+    }
+
+    return currentResult;
+  }
+
+  public final void addTaskValidator(final TaskValidator<T> taskValidator) {
+    this.validatorChain.add(taskValidator);
+  }
+
+}