| /* |
| * 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.drill.exec.util; |
| |
| import java.util.Arrays; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| import com.fasterxml.jackson.core.JsonProcessingException; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.datatype.joda.JodaModule; |
| |
| /* |
| * Simple class that extends the regular java.util.HashMap but overrides the |
| * toString() method of the HashMap class to produce a JSON string instead |
| */ |
| public class JsonStringHashMap<K, V> extends LinkedHashMap<K, V> { |
| |
| private static final ObjectMapper mapper = new ObjectMapper() |
| .registerModule(SerializationModule.getModule()) |
| .registerModule(new JodaModule()); |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (!(obj instanceof Map)) { |
| return false; |
| } |
| Map<?,?> other = (Map<?,?>) obj; |
| if (this.size() != other.size()) { |
| return false; |
| } |
| for (K key : this.keySet()) { |
| if (this.get(key) == null ) { |
| if (other.get(key) == null) { |
| continue; |
| } else { |
| return false; |
| } |
| } |
| if (this.get(key) instanceof byte[]) { |
| if (other.get(key) instanceof byte[]) { |
| return Arrays.equals((byte[]) this.get(key), (byte[]) other.get(key)); |
| } else { |
| return false; |
| } |
| } |
| if ( ! this.get(key).equals(other.get(key))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public final String toString() { |
| try { |
| return mapper.writeValueAsString(this); |
| } catch(JsonProcessingException e) { |
| throw new IllegalStateException("Cannot serialize hash map to JSON string", e); |
| } |
| } |
| } |