/
JsonStringHashMap.java
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/
JsonStringHashMap.java
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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.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;
/*
* 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 ObjectMapper mapper;
static {
mapper = new ObjectMapper();
}
@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);
}
}
}