hd3gtv.mydmam.manager.GsonThrowable.java Source code

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Here is the source code for hd3gtv.mydmam.manager.GsonThrowable.java

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/*
 * This file is part of MyDMAM.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * Copyright (C) hdsdi3g for hd3g.tv 2014
 * 
*/
package hd3gtv.mydmam.manager;

import hd3gtv.tools.GsonIgnore;

import java.lang.reflect.Type;

import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public final class GsonThrowable {

    @GsonIgnore
    private JsonObject json;

    public GsonThrowable(Throwable t) {
        if (t == null) {
            throw new NullPointerException("\"t\" can't to be null");
        }
        json = toJson(t);
    }

    private GsonThrowable(JsonObject json) {
        this.json = json;
    }

    private static JsonObject toJson(Throwable src) {
        JsonObject result = new JsonObject();
        result.addProperty("message", src.getMessage());
        result.addProperty("class", src.getClass().getName());
        if (src.getCause() != null) {
            result.add("cause", toJson(src.getCause()));
        } else {
            result.add("cause", JsonNull.INSTANCE);
        }

        JsonArray ja_stacktrace = new JsonArray();
        StackTraceElement[] stack_trace = src.getStackTrace();
        StackTraceElement trace;
        for (int pos = 0; pos < stack_trace.length; pos++) {
            trace = stack_trace[pos];
            JsonObject jo_trace = new JsonObject();
            jo_trace.addProperty("class", trace.getClassName());
            jo_trace.addProperty("method", trace.getMethodName());
            if (trace.getFileName() != null) {
                jo_trace.addProperty("file", trace.getFileName());
            }
            jo_trace.addProperty("line", trace.getLineNumber());
            ja_stacktrace.add(jo_trace);
        }
        result.add("stacktrace", ja_stacktrace);
        return result;
    }

    final static String NEW_LINE = System.getProperty("line.separator");

    private static String toJsonString(JsonObject src) {
        StringBuffer sb = new StringBuffer();

        sb.append(src.get("class").getAsString());
        if (src.has("message")) {
            if (src.get("message").isJsonNull() == false) {
                sb.append(": ");
                sb.append(src.get("message").getAsString());
            }
        }
        sb.append(NEW_LINE);

        JsonArray ja_stack = src.get("stacktrace").getAsJsonArray();
        JsonObject jo_trace;
        for (int pos = 0; pos < ja_stack.size(); pos++) {
            jo_trace = ja_stack.get(pos).getAsJsonObject();
            sb.append("\tat ");
            sb.append(jo_trace.get("class").getAsString());
            sb.append(".");
            sb.append(jo_trace.get("method").getAsString());

            if (jo_trace.get("line").getAsInt() == -2) {
                sb.append("(Native Method)");
            } else if (jo_trace.has("file")) {
                if (jo_trace.get("line").getAsInt() >= 0) {
                    sb.append("(");
                    sb.append(jo_trace.get("file").getAsString());
                    sb.append(":");
                    sb.append(jo_trace.get("line").getAsInt());
                    sb.append(")");
                } else {
                    sb.append("(");
                    sb.append(jo_trace.get("file").getAsString());
                    sb.append(")");
                }
            } else {
                sb.append("(Unknown Source)");
            }
            sb.append(NEW_LINE);
        }
        if (src.get("cause").isJsonNull() == false) {
            sb.append("Caused by: ");
            sb.append(toJsonString(src.get("cause").getAsJsonObject()));
        }
        return sb.toString();
    }

    public String getPrintedStackTrace() {
        return toJsonString(json);
    }

    public static class Serializer implements JsonSerializer<GsonThrowable>, JsonDeserializer<GsonThrowable> {

        public GsonThrowable deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            return new GsonThrowable(json.getAsJsonObject());
        }

        public JsonElement serialize(GsonThrowable gt, Type typeOfSrc, JsonSerializationContext context) {
            return gt.json;
        }

    }

}