missing file from subclipse

spring-batch-execution/src/main/java/org/springframework/batch/execution/scope/StepSynchronizationManager.java

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+/*
+ * Copyright 2006-2007 the original author or authors.
+ *
+ * Licensed 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.springframework.batch.execution.scope;
+
+/**
+ * @author Dave Syer
+ * 
+ */
+public class StepSynchronizationManager {
+
+	private static final ThreadLocal contextHolder = new InheritableThreadLocal();
+
+	/**
+	 * Getter for the current context..
+	 * 
+	 * @return the current {@link StepContext} or null if there is none
+	 *         (if we are not in a step).
+	 */
+	public static StepContext getContext() {
+		return (StepContext) contextHolder.get();
+	}
+
+	/**
+	 * Method for registering a context - should only be used by
+	 * {@link StepExecutor} implementations to ensure that {@link #getContext()}
+	 * always returns the correct value.
+	 * @param context TODO
+	 */
+	public static void register(StepContext context) {
+		StepSynchronizationManager.contextHolder.set(context);
+	}
+
+	/**
+	 * Method for de-registering the current context - should only be used by
+	 * {@link StepExecutor} implementations to ensure that {@link #getContext()}
+	 * always returns the correct value.
+	 * 
+	 * @return the old value if there was one.
+	 */
+	public static StepContext close() {
+		StepContext oldSession = getContext();
+		if (oldSession == null) {
+			return null;
+		}
+		oldSession.close();
+		StepContext context = oldSession.getParent();
+		StepSynchronizationManager.contextHolder.set(context);
+		return context;
+	}
+
+	/**
+	 * Used internally by {@link StepExecutor} implementations to clear the
+	 * current context at the end of a batch.
+	 * 
+	 * @return the old value if there was one.
+	 */
+	public static StepContext clear() {
+		StepContext context = getContext();
+		StepSynchronizationManager.contextHolder.set(null);
+		return context;
+	}
+
+}