com.mzs.httpcore.client.GsonUtils.java Source code

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Here is the source code for com.mzs.httpcore.client.GsonUtils.java

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/******************************************************************************
 *  Copyright (c) 2011 GitHub Inc.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
 *****************************************************************************/
package com.mzs.httpcore.client;

import static com.google.gson.FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES;

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

import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Date;

/**
 * Gson utilities.
 */
public abstract class GsonUtils {

    private static final Gson GSON = createGson(true);

    private static final Gson GSON_NO_NULLS = createGson(false);

    /**
     * Create the standard {@link com.google.gson.Gson} configuration
     *
     * @return created gson, never null
     */
    public static final Gson createGson() {
        return createGson(true);
    }

    /**
     * Create the standard {@link com.google.gson.Gson} configuration
     *
     * @param serializeNulls
     *            whether nulls should be serialized
     *
     * @return created gson, never null
     */
    public static final Gson createGson(final boolean serializeNulls) {
        final GsonBuilder builder = new GsonBuilder();
        builder.registerTypeAdapter(Date.class, new DateFormatter());
        builder.setFieldNamingPolicy(LOWER_CASE_WITH_UNDERSCORES);
        if (serializeNulls)
            builder.serializeNulls();
        return builder.create();
    }

    /**
     * Get reusable pre-configured {@link com.google.gson.Gson} instance
     *
     * @return Gson instance
     */
    public static final Gson getGson() {
        return GSON;
    }

    /**
     * Get reusable pre-configured {@link com.google.gson.Gson} instance
     *
     * @param serializeNulls
     * @return Gson instance
     */
    public static final Gson getGson(final boolean serializeNulls) {
        return serializeNulls ? GSON : GSON_NO_NULLS;
    }

    /**
     * Convert object to json
     *
     * @param object
     * @return json string
     */
    public static final String toJson(final Object object) {
        return toJson(object, true);
    }

    /**
     * Convert object to json
     *
     * @param object
     * @param includeNulls
     * @return json string
     */
    public static final String toJson(final Object object, final boolean includeNulls) {
        return includeNulls ? GSON.toJson(object) : GSON_NO_NULLS.toJson(object);
    }

    /**
     * Convert string to given type
     *
     * @param json
     * @param type
     * @return instance of type
     */
    public static final <V> V fromJson(String json, Class<V> type) {
        return GSON.fromJson(json, type);
    }

    /**
     * Convert string to given type
     *
     * @param json
     * @param type
     * @return instance of type
     */
    public static final <V> V fromJson(String json, Type type) {
        return GSON.fromJson(json, type);
    }

    /**
     * Convert content of reader to given type
     *
     * @param reader
     * @param type
     * @return instance of type
     */
    public static final <V> V fromJson(Reader reader, Class<V> type) {
        return GSON.fromJson(reader, type);
    }

    /**
     * Convert content of reader to given type
     *
     * @param reader
     * @param type
     * @return instance of type
     */
    public static final <V> V fromJson(Reader reader, Type type) {
        return GSON.fromJson(reader, type);
    }
}