com.sdklite.sphere.hybrid.JSONPResponse Maven / Gradle / Ivy

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package com.sdklite.sphere.hybrid;

import java.io.ByteArrayInputStream;
import java.util.Collection;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * The {@link JSONPResponse} represent a JSON-P javascript resource
 *
 * @author johnsonlee
 * @since 1.0.0
 */
public final class JSONPResponse extends JavaScriptResponse {

    /**
     * Create a JSON-P response with the specified callback and arguments
     *
     * @param callback
     *           The name of javascript callback
     * @param args
     *           The arguments of the callback
     */
    public JSONPResponse(final String callback, final Object... args) {
        super(new ByteArrayInputStream((callback + "(" + wrapArguments(args) + ");").getBytes()));
    }

    private static String wrapArguments(final Object[] arguments) {
        if (null == arguments || arguments.length <= 0) {
            return "";
        }

        final StringBuilder args = new StringBuilder();
        for (int i = 0; i < arguments.length; i++) {
            if (i > 0) {
                args.append(", ");
            }

            args.append(wrapArgument(arguments[i]));
        }

        return args.toString();
    }

    private static String wrapArgument(final Object o) {
        if (o == null || o.equals(JSONObject.NULL)) {
            return JSONObject.NULL.toString();
        }

        if (o instanceof JSONArray || o instanceof JSONObject || o instanceof Boolean) {
            return o.toString();
        }

        try {
            if (o instanceof Collection) {
                return new JSONArray((Collection) o).toString();
            } else if (o.getClass().isArray()) {
                return new JSONArray(o).toString();
            }

            if (o instanceof Map) {
                return new JSONObject((Map) o).toString();
            }

            if (o instanceof Number) {
                return JSONObject.numberToString((Number) o);
            }

            if (o instanceof Character || o instanceof CharSequence) {
                return JSONObject.quote(String.valueOf(o));
            }

            if (o.getClass().getPackage().getName().startsWith("java.")) {
                return JSONObject.quote(o.toString());
            }
        } catch (final Exception ignored) {
        }

        return JSONObject.NULL.toString();
    }

}