org.onebusaway.admin.json.LowerCaseWDashesGsonJsonTool.java Source code

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Here is the source code for org.onebusaway.admin.json.LowerCaseWDashesGsonJsonTool.java

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/**
 * Copyright (C) 2015 Cambridge Systematics, Inc.
 *
 * 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 org.onebusaway.admin.json;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

import org.joda.time.DateTime;
import org.joda.time.LocalDate;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class LowerCaseWDashesGsonJsonTool implements JsonTool {

    /**
     * Initialize, and specify whether we should pretty print.
     * @param prettyPrintOutput to pretty print, or not to pretty print.
     */
    public LowerCaseWDashesGsonJsonTool(boolean prettyPrintOutput) {
        super();

        this.prettyPrintOutput = prettyPrintOutput;
    }

    /**
     * Initialize using the default of no pretty printing.
     */
    public LowerCaseWDashesGsonJsonTool() {
        this(false);
    }

    private boolean prettyPrintOutput;

    public void setPrettyPrintOutput(boolean prettyPrintOutput) {
        this.prettyPrintOutput = prettyPrintOutput;

        buildGsonObject();
    }

    @Override
    public <T> T readJson(Reader reader, Class<T> classOfT) {
        Gson gson = buildGsonObject();
        return gson.fromJson(reader, classOfT);
    }

    @Override
    public void writeJson(Writer writer, Object objectToWrite) throws IOException {
        Gson gson = buildGsonObject();

        String serializedObject = gson.toJson(objectToWrite);

        writer.write(serializedObject);
    }

    private Gson buildGsonObject() {
        GsonBuilder gbuilder = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_DASHES);

        setTypeAdapters(gbuilder);

        if (prettyPrintOutput)
            gbuilder.setPrettyPrinting();

        Gson gson = gbuilder.create();

        return gson;
    }

    private void setTypeAdapters(GsonBuilder gsonBuilder) {
        // First set Joda DateTime Adapter
        gsonBuilder.registerTypeAdapter(LocalDate.class, new JodaLocalDateAdapter());
        gsonBuilder.registerTypeAdapter(DateTime.class, new JodaDateTimeAdapter());
    }
}