com.orientechnologies.orient.jdbc.util.DataSourceContextHolder.java Source code

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Here is the source code for com.orientechnologies.orient.jdbc.util.DataSourceContextHolder.java

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/***************************************************************************
 * Copyright 2011 TXT e-solutions SpA
 * 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.
 * 
 * This work was performed within the IoT_at_Work Project
 * and partially funded by the European Commission's
 * 7th Framework Programme under the research area ICT-2009.1.3
 * Internet of Things and enterprise environments.
 *
 * Authors:
 *      Salvatore Piccione (TXT e-solutions SpA)
 *
 * Contributors:
 *        Domenico Rotondi (TXT e-solutions SpA)
 **************************************************************************/
package com.orientechnologies.orient.jdbc.util;

import org.springframework.util.Assert;

/**
 * @author Salvatore Piccione (TXT e-solutions SpA)
 *
 */
public class DataSourceContextHolder {
    /**
     * Holds the context data as a thread local string variable.
     */
    private static final ThreadLocal<String> CONTEXT_HOLDER = new ThreadLocal<String>();

    /**
     * Returns the current data source context.
     * 
     * @return the current data source context.
     */
    public static String getContext() {
        return CONTEXT_HOLDER.get();
    }

    /**
     * Sets the current data source context.
     * 
     * @param lookupKey the current data source context.
     */
    public static void setContext(String lookupKey) {
        Assert.notNull(lookupKey, "The lookup key of the data source context cannot be null.");
        CONTEXT_HOLDER.set(lookupKey);
    }

    /**
     * Removes the current data source context.
     */
    public static void clearContext() {
        CONTEXT_HOLDER.remove();
    }

    /**
     * States whether the company name has been set.
     * 
     * @return {@code true} if the context data has been defined, {@code false} otherwise.
     */
    public static boolean hasContext() {
        return CONTEXT_HOLDER.get() != null;
    }
}