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src/main/java/com/alibaba/qlexpress4/runtime/context/MapExpressContext.java

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+package com.alibaba.qlexpress4.runtime.context;
+
+import com.alibaba.qlexpress4.runtime.Value;
+import com.alibaba.qlexpress4.runtime.data.MapItemValue;
+
+import java.util.Map;
+
+/**
+ * Author: DQinYuan
+ */
+public class MapExpressContext implements ExpressContext {
+    
+    private final Map<String, Object> source;
+    
+    public MapExpressContext(Map<String, Object> source) {
+        this.source = source;
+    }
+    
+    @Override
+    public Value get(Map<String, Object> attachments, String variableName) {
+        return new MapItemValue(source, variableName);
+    }
+}