/**
    *
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.hadoop.hbase.util;
  
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Matchers.eq;
  import static org.mockito.Mockito.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  import com.google.common.reflect.TypeToken;
  import java.io.PrintWriter;
  import java.io.StringWriter;
  import java.lang.reflect.Type;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import javax.management.MBeanAttributeInfo;
  import javax.management.MBeanInfo;
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  import javax.management.QueryExp;
  import org.apache.hadoop.hbase.testclassification.MiscTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hbase.thirdparty.com.google.gson.Gson;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  /**
   * Test {@link JSONBean}.
   */
  @Category({MiscTests.class, SmallTests.class})
  public class TestJSONBean {
    private MBeanServer getMockMBeanServer() throws Exception {
      MBeanServer mbeanServer = mock(MBeanServer.class);
      Set<ObjectName> names = new HashSet<>();
      names.add(new ObjectName("test1:type=test2"));
      when(mbeanServer.queryNames(any(ObjectName.class), any(QueryExp.class))).thenReturn(names);
      MBeanInfo mbeanInfo = mock(MBeanInfo.class);
      when(mbeanInfo.getClassName()).thenReturn("testClassName");
      String[] attributeNames = new String[] {"intAttr", "nanAttr", "infinityAttr",
        "strAttr", "boolAttr"};
      MBeanAttributeInfo[] attributeInfos = new MBeanAttributeInfo[attributeNames.length];
      for (int i = 0; i < attributeInfos.length; i++) {
        attributeInfos[i] = new MBeanAttributeInfo(attributeNames[i],
          null,
          null,
          true,
          false,
          false);
      }
      when(mbeanInfo.getAttributes()).thenReturn(attributeInfos);
      when(mbeanServer.getMBeanInfo(any(ObjectName.class))).thenReturn(mbeanInfo);
      when(mbeanServer.getAttribute(any(ObjectName.class), eq("intAttr"))).thenReturn(3);
      when(mbeanServer.getAttribute(any(ObjectName.class), eq("nanAttr"))).thenReturn(Double.NaN);
      when(mbeanServer.getAttribute(any(ObjectName.class), eq("infinityAttr"))).
        thenReturn(Double.POSITIVE_INFINITY);
      when(mbeanServer.getAttribute(any(ObjectName.class), eq("strAttr"))).thenReturn("aString");
      when(mbeanServer.getAttribute(any(ObjectName.class), eq("boolAttr"))).thenReturn(true);
      return mbeanServer;
    }
  
    private String getExpectedJSON() {
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      pw.println("{");
      pw.println("  \"beans\": [");
      pw.println("    {");
      pw.println("      \"name\": \"test1:type=test2\",");
      pw.println("      \"modelerType\": \"testClassName\",");
      pw.println("      \"intAttr\": 3,");
      pw.println("      \"nanAttr\": \"NaN\",");
      pw.println("      \"infinityAttr\": \"Infinity\",");
      pw.println("      \"strAttr\": \"aString\",");
      pw.println("      \"boolAttr\": true");
      pw.println("    }");
      pw.println("  ]");
      pw.print("}");
      return sw.toString();
    }
  
    @Test
    public void testJSONBeanValueTypes() throws Exception {
      JSONBean bean = new JSONBean();
     StringWriter stringWriter = new StringWriter();
     try (
       PrintWriter printWriter = new PrintWriter(stringWriter);
       JSONBean.Writer jsonWriter = bean.open(printWriter)) {
       jsonWriter.write(getMockMBeanServer(), null, null, false);
     }
 
     final Gson gson = GsonUtil.createGson().create();
     Type typeOfHashMap = new TypeToken<Map<String, Object>>() {}.getType();
     Map<String, Object> expectedJson = gson.fromJson(getExpectedJSON(), typeOfHashMap);
     Map<String, Object> actualJson = gson.fromJson(stringWriter.toString(), typeOfHashMap);
     assertEquals(expectedJson, actualJson);
   }
 }