增加 Spring FactoryBean 的集成支持

[subchen]

配置如下：

<bean id="jetEngine" class="jetbrick.template.JetEngineFactoryBean" />

<bean id="jetEngine" class="jetbrick.template.JetEngineFactoryBean">
  <property name="configFile" value="classpath:META-INF/jetbrick-template.properties" />
</bean>

<bean id="jetEngine" class="jetbrick.template.JetEngineFactoryBean">
   <property name="configFile" value="file:/path/to/jetbrick-template.properties" />
</bean>

感谢 @应卓(yingzhor@gmail.com) 贡献代码

[subchen]

最好能支持直接配置属性

<bean id="jetEngine" class="jetbrick.template.JetEngineFactoryBean">
  <property name="configProperties">
    <props>
        <prop key="template.path">${template.path}</prop>
        ...
    </props>
  </property>
</bean>

[yingzhuo]

收到，我尽快更新。

[yingzhuo]

代码已经修改完毕，请查收

源代码

package jetbrick.template.spring;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Properties;

import jetbrick.template.JetEngine;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.Resource;


/**
 * 
 * 你可以按照以下方式配置JetEngine在Spring上下文的实例(单例) <br>
 * <strong>注意:</strong>当同时指定configFile和configProperties时，configProperties中的配置会<strong>覆盖</strong>configFile中的配置
 * 
 * <pre>
 *  &lt;bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean" /&gt;
 *  
 *  &lt;bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean"&gt;
 *    &lt;property name="configFile" value="classpath:META-INF/jetbrick-template.properties" /&gt;
 *  &lt;/bean&gt;
 *
 *  &lt;bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean"&gt;
 *     &lt;property name="configFile" value="file:/path/to/jetbrick-template.properties" /&gt;
 *  &lt;/bean&gt;
 *  
 *  &lt;bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean"&gt;
 *    &lt;property name="configFile" value="classpath:jetbrick-template.properties" /&gt;
 *      &lt;property name="configProperties"&gt;
 *        &lt;props&gt;
 *          &lt;prop key="compile.debug"&gt;true&lt;/prop&gt;
 *        &lt;/props&gt;
 *    &lt;/property&gt;
 *  &lt;/bean&gt;
 * </pre>
 * 
 * @author 应卓(yingzhor@gmail.com)
 *
 */
public class JetEngineFactoryBean implements FactoryBean<JetEngine>, InitializingBean {

    private Resource configFile = null;
    private JetEngine singleton = null;
    private Properties configProperties = null;

    public void afterPropertiesSet() throws Exception {

        if (configFile == null && configProperties == null) {
            singleton = JetEngine.create();
            return;
        }

        Properties effectProps = new Properties();

        if (configFile != null) {
            check(configFile.getFile());
            effectProps.load(configFile.getInputStream());
        }

        if (configProperties != null) {
            effectProps.putAll(configProperties);
        }

        singleton = JetEngine.create(effectProps);
    }

    // 配置有效性检验，如果配置不正确抛出异常使spring容器启动快速失败
    private void check(File file) throws Exception {

        // 配置文件存在但是是一个目录不是文件
        if (file.exists() && file.isDirectory()) {
            String msg = "config file exists but it is a directory.";
            throw new FileNotFoundException(msg);
        }
    }

    public JetEngine getObject() throws Exception {
        return singleton;
    }

    public Class<?> getObjectType() {
        return JetEngine.class;
    }

    public boolean isSingleton() {
        return true;
    }

    // getter and setter
    // -------------------------------------------------------------------------------------------------

    public Resource getConfigFile() {
        return configFile;
    }

    public void setConfigFile(Resource configFile) {
        this.configFile = configFile;
    }

    public Properties getConfigProperties() {
        return configProperties;
    }

    public void setConfigProperties(Properties configProperties) {
        this.configProperties = configProperties;
    }

}

配置示例

<bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean" />

<bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean">
    <property name="configFile" value="classpath:META-INF/jetbrick-template.properties" />
</bean>

<bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean">
    <property name="configFile" value="file:/path/to/jetbrick-template.properties" />
</bean>

<bean id="jetEngine" class="jetbrick.template.spring.JetEngineFactoryBean">
    <property name="configFile" value="classpath:jetbrick-template.properties" />
    <property name="configProperties">
        <props>
            <prop key="compile.debug">true</prop>
        </props>
    </property>
</bean>