package com.alibaba.json.bvt.serializer;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.PropertyPreFilter;
import com.alibaba.fastjson.serializer.SerialContext;
import junit.framework.TestCase;
import org.junit.Assert;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class PropertyPathTest3 extends TestCase {
/** 测试只输出子集合中的特定属性 */
public void test_path() throws Exception {
Person p1 = new Person();
p1.setId(100);
Person c1 = new Person();
c1.setId(1000);
Person c2 = new Person();
c2.setId(2000);
p1.getChildren().add(c1);
p1.getChildren().add(c2);
//只输出children.id以及根上的id
String s = JSON.toJSONString(p1, new MyPropertyPreFilter(new String[] {"children.id", "id"}));
Assert.assertEquals("{\"children\":[{\"id\":1000},{\"id\":2000}],\"id\":100}", s);
}
/** 测试只输出子字段map中的特定属性 */
public void test_path2() throws Exception {
Person2 p1 = new Person2();
p1.setId(1);
Map<String, String> infoMap = new HashMap<String, String>();
infoMap.put("name", "李三");
infoMap.put("height", "168");
p1.setInfoMap(infoMap);
//只输出infoMap.name
String s = JSON.toJSONString(p1, new MyPropertyPreFilter(new String[] {"infoMap.name"}));
Assert.assertEquals("{\"infoMap\":{\"name\":\"李三\"}}", s);
}
public static class MyPropertyPreFilter implements PropertyPreFilter {
String[] onlyProperties;
public MyPropertyPreFilter(String[] onlyProperties) {
this.onlyProperties = onlyProperties;
}
private static boolean containInclude(String[] ss, String s) {
if(ss == null || ss.length == 0 || s == null)
return false;
for(String st : ss)
if(st.startsWith(s))
return true;
return false;
}
public boolean apply(JSONSerializer serializer, Object source, String name) {
SerialContext nowContext = new SerialContext(serializer.getContext(), source, name);
String nowPath = getLinkedPath(nowContext);
System.out.println("path->" + nowPath);
//只输出children.id
return containInclude(onlyProperties, nowPath);
}
}
/** 输出结果 类似a.b.c.d等格式，忽略[] */
private static String getLinkedPath(SerialContext serialContext) {
//这里有点bad smell，即要考虑parent为null,又要考虑fieldName为null，且对collection判断只能从fieldName，而不能从object入手
boolean isCollection = serialContext.getFieldName() instanceof Integer;
boolean isFieldNameNull = serialContext.getFieldName() == null;
if(serialContext.getParent() == null)
return isCollection ? "" : isFieldNameNull ? "" : String.valueOf(serialContext.getFieldName());
String parentLinkedPath = getLinkedPath(serialContext.getParent());
if(isCollection || isFieldNameNull)
return parentLinkedPath;
return
parentLinkedPath.length() == 0 ? String.valueOf(serialContext.getFieldName()) :
parentLinkedPath + "." + serialContext.getFieldName();
}
public static class Person {
private int id;
private int id2;
private List<Person> children = new ArrayList<Person>();
public int getId2() {
return id2;
}
public void setId2(int id2) {
this.id2 = id2;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public List<Person> getChildren() {
return children;
}
public void setChildren(List<Person> children) {
this.children = children;
}
}
public static class Person2 {
private int id;
private Map<String, String> infoMap;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Map<String, String> getInfoMap() {
return infoMap;
}
public void setInfoMap(Map<String, String> infoMap) {
this.infoMap = infoMap;
}
}
}