Added conditional rule runner.
diff --git a/src/main/java/org/junit/rules/RunExternalResourceConditionally.java b/src/main/java/org/junit/rules/RunExternalResourceConditionally.java
new file mode 100644
index 0000000..91e69a3
--- /dev/null
+++ b/src/main/java/org/junit/rules/RunExternalResourceConditionally.java
@@ -0,0 +1,61 @@
+/*
+ * 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.junit.rules;
+
+/**
+ * Use this to "decorate" a resource to ensure that it is
+ * initialized and de-initialized only if the condition is met.
+ *
+ * Example:
+ *
+ * <pre>
+ * {@code
+ * @literal @ClassRule
+ * public static final ExternalResource EUREKA_FOR_TEST = RunExternalResourceConditionally(
+ * new EurekaForTest()
+ * System.getProperty("external.infrastructure") == null);
+ * }
+ * </pre>
+ *
+ * @author Myrle Krantz
+ */
+@SuppressWarnings("unused")
+public class RunExternalResourceConditionally extends ExternalResource {
+ private final ExternalResource decoratedResource;
+ private final boolean condition;
+
+ public RunExternalResourceConditionally(
+ final ExternalResource decoratedResource,
+ final boolean condition) {
+ this.decoratedResource = decoratedResource;
+ this.condition = condition;
+ }
+
+ @Override
+ protected void before() throws Throwable {
+ if (condition)
+ decoratedResource.before();
+ }
+
+ @Override
+ protected void after() {
+ if (condition)
+ decoratedResource.after();
+ }
+}
