com.nextdoor.bender.operation.json.key.LowerCaseKeyOperation.java Source code

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Here is the source code for com.nextdoor.bender.operation.json.key.LowerCaseKeyOperation.java

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/*
 * Licensed 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.
 *
 * Copyright 2017 Nextdoor.com, Inc
 *
 */

package com.nextdoor.bender.operation.json.key;

import java.util.HashSet;
import java.util.Map.Entry;
import java.util.Set;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.nextdoor.bender.operation.json.PayloadOperation;

/**
 * In place recursively mutates a {@link JsonObject} keys to lower case them.
 */
public class LowerCaseKeyOperation extends PayloadOperation {
    protected void perform(JsonObject obj) {
        Set<Entry<String, JsonElement>> entries = obj.entrySet();
        Set<Entry<String, JsonElement>> orgEntries = new HashSet<Entry<String, JsonElement>>(entries);

        for (Entry<String, JsonElement> entry : orgEntries) {

            JsonElement val = entry.getValue();
            obj.remove(entry.getKey());
            String key = entry.getKey().toLowerCase();

            if (val.isJsonPrimitive()) {
                obj.add(key, val);
            } else if (val.isJsonObject()) {
                obj.add(key, val);
                perform(val.getAsJsonObject());
            } else if (val.isJsonArray()) {
                obj.add(key, val);

                val.getAsJsonArray().forEach(elm -> {
                    if (elm.isJsonObject()) {
                        perform((JsonObject) elm);
                    }
                });
            }
        }
    }
}