org.apache.solr.common.util.ReflectMapWriter Maven / Gradle / Ivy

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/*
 * 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.solr.common.util;

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

import org.apache.solr.common.MapWriter;
import org.apache.solr.common.annotation.JsonProperty;

// An implementation of MapWriter which is annotated with Jackson annotations
public interface ReflectMapWriter extends MapWriter {

  @Override
  default void writeMap(EntryWriter ew) throws IOException {
    for (Field field : this.getClass().getDeclaredFields()) {
      JsonProperty prop = field.getAnnotation(JsonProperty.class);
      if (prop == null) continue;
      int modifiers = field.getModifiers();
      if (Modifier.isPublic(modifiers) && !Modifier.isStatic(modifiers)) {
        String fname = prop.value().isEmpty() ? field.getName() : prop.value();
        try {
          if (field.getType() == int.class) {
            ew.put(fname, field.getInt(this));
          } else if (field.getType() == float.class) {
            ew.put(fname, field.getFloat(this));
          } else if (field.getType() == double.class) {
            ew.put(fname, field.getDouble(this));
          } else if (field.getType() == boolean.class) {
            ew.put(fname, field.getBoolean(this));
          } else if (field.getType() == long.class) {
            ew.put(fname, field.getLong(this));
          } else {
            ew.putIfNotNull(fname, field.get(this));
          }
        } catch (IllegalAccessException e) {
          //it should not happen
        }
      }
    }
  }

}