org.impalaframework.web.helper.WebServletUtils.java Source code

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Here is the source code for org.impalaframework.web.helper.WebServletUtils.java

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/*
 * Copyright 2007-2010 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.impalaframework.web.helper;

import javax.servlet.ServletContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.impalaframework.facade.ModuleManagementFacade;
import org.impalaframework.util.ObjectUtils;
import org.impalaframework.web.WebConstants;
import org.springframework.util.Assert;

/**
 * Class with static convenience methods for publish, accessing, and removing <code>ServletContext</code>-based state. 
 * @author Phil Zoio
 */
public abstract class WebServletUtils {

    private static final Log logger = LogFactory.getLog(WebServletUtils.class);

    public static ModuleManagementFacade getModuleManagementFacade(ServletContext servletContext) {

        Assert.notNull(servletContext);
        final String attributeName = WebConstants.IMPALA_FACTORY_ATTRIBUTE;
        final Object attribute = servletContext.getAttribute(attributeName);

        if (logger.isDebugEnabled()) {
            logger.debug("Retrieved ModuleManagementFacade from ServletContext with attribute name '"
                    + attributeName + "': " + attribute);
        }

        return ObjectUtils.cast(attribute, ModuleManagementFacade.class);
    }

}