add Document and test

ctalk/src/com/db/letdb/Document.java

@@ -0,0 +1,30 @@
+package com.db.letdb;
+
+import com.alibaba.fastjson.JSON;
+
+/**
+ * @created: Mar 1, 2012
+ * @author : jias chao<[email protected]>
+ */
+public class Document {
+
+	private String id;
+
+	protected String getJsonStr(){
+		 String jstr = JSON.toJSONString(this);
+		 return jstr;
+	}
+
+	protected Document getInstance(String jstr){
+		Document doc = JSON.parseObject(jstr, Document.class);
+		return doc;
+	}
+
+	public String getId() {
+		return id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+}

ctalk/src/com/db/letdb/LetdbFile.java

@@ -103,4 +103,6 @@ public int sync() throws IOException{
 		return out.toByteArray().length;
 	}
 
+
+
 }

ctalk/test/com/db/letdb/DocumentTest.java

@@ -0,0 +1,34 @@
+package com.db.letdb;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+
+/**
+ * @created: Mar 1, 2012
+ * @author : jias chao<[email protected]>
+ */
+public class DocumentTest {
+
+
+	@Test
+	public void testDoc2json(){
+		Document doc = new Document();
+		assertEquals("{}",doc.getJsonStr());
+
+
+		doc.setId("abc-12");
+		assertEquals("{\"id\":\"abc-12\"}",doc.getJsonStr());
+	}
+
+
+	@Test
+	public void testJson2Doc(){
+
+		String str = "{\"id\":\"abc-12\"}";
+		Document doc = new Document().getInstance(str);
+		assertEquals("abc-12",doc.getId());
+	}
+
+}