com.laxser.blitz.web.var.PrivateVar.java Source code

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Here is the source code for com.laxser.blitz.web.var.PrivateVar.java

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/*
 * Copyright 2007-2009 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 com.laxser.blitz.web.var;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.servlet.ServletContext;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

/**
 * ??Blitz?.
 * 
 * @author laxser  Date 2012-3-22 ?5:02:30
@contact [duqifan@gmail.com]
@PrivateVar.java
    
 */
public final class PrivateVar {

    // ?ServletContextBlitzFilter?servletContext(ServlerContext)?
    //    private static ServletContext servletContext;

    // ---------------------------------------------------------------

    /**
     * ??WebSpring.
     * <p>
     * Spring??module.
     * 
     * @return
     */
    public static WebApplicationContext getRootWebApplicationContext(ServletContext servletContext) {
        return WebApplicationContextUtils.getWebApplicationContext(servletContext);
    }

    /**
     * ??
     */
    private PrivateVar() {
        throw new AssertionError();
    }

    private static Properties blitzProperties;

    public static String getProperty(ServletContext servletContext, String name) {
        return getProperty(servletContext, name, null);
    }

    /**
     * 
     * @param name
     * @return
     */
    public static String getProperty(ServletContext servletContext, String name, String def) {
        if (blitzProperties == null) {
            String blitzPropertiesPath = "blitz.properties";
            if (servletContext != null) {
                blitzPropertiesPath = "/WEB-INF/blitz.properties";
            }
            Properties blitzProperties = new Properties();
            File file = new File(servletContext.getRealPath(blitzPropertiesPath));
            if (file.exists()) {
                InputStream in = null;
                try {
                    in = new FileInputStream(file);
                    blitzProperties.load(in);
                } catch (IOException e) {
                    throw new IllegalArgumentException(blitzPropertiesPath, e);
                } finally {
                    if (in != null) {
                        try {
                            in.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                        }
                    }
                }
                PrivateVar.blitzProperties = blitzProperties;
            } else {
                PrivateVar.blitzProperties = new Properties();
            }
        }
        return blitzProperties.getProperty(name, def);
    }
}