com.spotify.apollo.meta.TypesafeConfigSerializer.java Source code

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Here is the source code for com.spotify.apollo.meta.TypesafeConfigSerializer.java

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/*
 * -\-\-
 * Spotify Apollo API Implementations
 * --
 * Copyright (C) 2013 - 2015 Spotify AB
 * --
 * 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.
 * -/-/-
 */
package com.spotify.apollo.meta;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.typesafe.config.ConfigList;
import com.typesafe.config.ConfigObject;
import com.typesafe.config.ConfigOrigin;
import com.typesafe.config.ConfigValue;
import com.typesafe.config.ConfigValueType;

import java.io.IOException;
import java.util.Map;

/**
 * Custom serializer that unwraps instances of {@link com.typesafe.config.ConfigValue}.
 */
class TypesafeConfigSerializer extends JsonSerializer<ConfigValue> {

    private final boolean withOrigins;

    TypesafeConfigSerializer(boolean withOrigins) {
        this.withOrigins = withOrigins;
    }

    @Override
    public void serialize(ConfigValue value, JsonGenerator jgen, SerializerProvider provider) throws IOException {

        if (value.valueType() == ConfigValueType.OBJECT) {
            final ConfigObject object = (ConfigObject) value;

            jgen.writeStartObject();
            for (Map.Entry<String, ConfigValue> valueEntry : object.entrySet()) {
                if (withOrigins) {
                    final ConfigOrigin origin = valueEntry.getValue().origin();
                    jgen.writeStringField(valueEntry.getKey() + "__origin",
                            origin.description() + (origin.filename() != null ? ", " + origin.filename() : ""));
                }
                jgen.writeObjectField(valueEntry.getKey(), valueEntry.getValue());
            }
            jgen.writeEndObject();
        } else if (value.valueType() == ConfigValueType.LIST) {
            final ConfigList list = (ConfigList) value;

            jgen.writeStartArray();
            for (ConfigValue configValue : list) {
                jgen.writeObject(configValue);
            }
            jgen.writeEndArray();
        } else {
            jgen.writeObject(value.unwrapped());
        }
    }
}