update

README.md

@@ -457,4 +457,93 @@ InstructionSet instructionSet = expressRunner.parseInstructionSet(expressString)
  InstructionSet getInstructionSetFromLocalCache(String expressString);
  //清除缓存
  void clearExpressCache();
+```
+
+### （6）增强上下文参数Context相关的api
+
+#### 6.1 与spring框架的无缝集成
+上下文参数 IExpressContext context 非常有用，它允许put任何变量，然后在脚本中识别出来。
+
+在实际中我们很希望能够无缝的集成到spring框架中，可以仿照下面的例子使用一个子类。
+
+```java
+public class QLExpressContext extends HashMap<String, Object> implements
+ IExpressContext<String, Object> {
+
+ private ApplicationContext context;
+
+ //构造函数，传入context和 ApplicationContext
+ public QLExpressContext(Map<String, Object> map,
+ ApplicationContext aContext) {
+ super(map);
+ this.context = aContext;
+ }
+
+ /**
+ * 抽象方法：根据名称从属性列表中提取属性值
+ */
+ public Object get(Object name) {
+ Object result = null;
+ result = super.get(name);
+ try {
+ if (result == null && this.context != null
+ && this.context.containsBean((String) name)) {
+ // 如果在Spring容器中包含bean，则返回String的Bean
+ result = this.context.getBean((String) name);
+ }
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ return result;
+ }
+
+ public Object put(String name, Object object) {
+ return super.put(name, object);
+ }
+
+}
+
+```
+
+完整的demo参照 [SpringDemoTest.java](https://github.com/alibaba/QLExpress/blob/master/src/test/java/com/ql/util/express/test/spring/SpringDemoTest.java)
+
+
+#### 6.2 自定义函数操作符获取原始的context控制上下文
+
+自定义的Operator需要直接继承OperatorBase，获取到parent即可，可以用于在运行一组脚本的时候，直接编辑上下文信息，业务逻辑处理上也非常有用。
+
+```java
+
+public class ContextMessagePutTest {
+
+
+ class OperatorContextPut extends OperatorBase {
+
+ public OperatorContextPut(String aName) {
+ this.name = aName;
+ }
+
+ @Override
+ public OperateData executeInner(InstructionSetContext parent, ArraySwap list) throws Exception {
+ String key = list.get(0).toString();
+ Object value = list.get(1);
+ parent.put(key,value);
+ return null;
+ }
+ }
+
+ @Test
+ public void test() throws Exception{
+ ExpressRunner runner = new ExpressRunner();
+ OperatorBase op = new OperatorContextPut("contextPut");
+ runner.addFunction("contextPut",op);
+ String exp = "contextPut('success','false');contextPut('error','错误信息');contextPut('warning','提醒信息')";
+ IExpressContext<String, Object> context = new DefaultContext<String, Object>();
+ context.put("success","true");
+ Object result = runner.execute(exp,context,null,false,true);
+ System.out.println(result);
+ System.out.println(context);
+ }
+}
+
 ```