Mercurial > hg > release > thermostat-1.2
view web/common/src/main/java/com/redhat/thermostat/web/common/typeadapters/WebQueryResponseTypeAdapter.java @ 1660:c6ae78b6f3ac
[Thermostat 1.2] Update copyright year to 2015
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2015-March/013127.html
PR2273
author | Severin Gehwolf <sgehwolf@redhat.com> |
---|---|
date | Wed, 11 Mar 2015 15:07:27 +0100 |
parents | fb69a13dd11c |
children |
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/* * Copyright 2012-2015 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat 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 * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.web.common.typeadapters; import java.io.IOException; import java.lang.reflect.Array; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import com.google.gson.Gson; import com.google.gson.TypeAdapter; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonToken; import com.google.gson.stream.JsonWriter; import com.redhat.thermostat.storage.model.Pojo; import com.redhat.thermostat.web.common.WebQueryResponse; class WebQueryResponseTypeAdapter<T extends Pojo> extends TypeAdapter<WebQueryResponse<T>> { private static final String PROP_RESULT = "payload"; private static final String PROP_ERROR_CODE = "errno"; private static final String PROP_CURSOR_ID = "cId"; private static final String PROP_CURSOR_HAS_MORE_BATCHES = "cHasMore"; // The runtime type of the Pojo private final Class<T> runtimePojoType; private final Gson gson; WebQueryResponseTypeAdapter(Type parameterizedType, Gson gson) { this.runtimePojoType = extractPojoImplClassFromType(parameterizedType); this.gson = gson; } @Override public void write(JsonWriter out, WebQueryResponse<T> value) throws IOException { // handle null if (value == null) { out.nullValue(); return; } out.beginObject(); // response code out.name(PROP_ERROR_CODE); out.value(value.getResponseCode()); // cursor id out.name(PROP_CURSOR_ID); out.value(value.getCursorId()); // has more batches property out.name(PROP_CURSOR_HAS_MORE_BATCHES); out.value(value.hasMoreBatches()); // payload out.name(PROP_RESULT); if (value.getResultList() == null) { out.nullValue(); } else { @SuppressWarnings("unchecked") TypeAdapter<T[]> pojoTa = (TypeAdapter<T[]>)gson.getAdapter(value.getResultList().getClass()); pojoTa.write(out, value.getResultList()); } out.endObject(); } @Override public WebQueryResponse<T> read(JsonReader in) throws IOException { // handle null if (in.peek() == JsonToken.NULL) { in.nextNull(); return null; } in.beginObject(); // response code (can't be null) int responseCode = 0; String name = in.nextName(); responseCode = in.nextInt(); // cursor ID (can't be null) name = in.nextName(); int cursorId = in.nextInt(); // Has more batches, boolean, can't be null name = in.nextName(); boolean hasMoreBatches = in.nextBoolean(); if (runtimePojoType == null) { throw new IllegalStateException("Runtime pojo type unknown"); } // Result list may be null. If it's there we get a name, otherwise // we are done deserializing T[] resultList = null; if (in.peek() == JsonToken.NAME) { name = in.nextName(); if (name.equals(PROP_RESULT)) { @SuppressWarnings("unchecked") T[] arrayType = (T[])Array.newInstance(runtimePojoType, 0); @SuppressWarnings("unchecked") Class<T[]> type = (Class<T[]>)arrayType.getClass(); TypeAdapter<T[]> pojoTa = gson.getAdapter(type); resultList = pojoTa.read(in); } else { throw new IllegalStateException("Expected " + PROP_RESULT + " but got " + name); } } in.endObject(); WebQueryResponse<T> qResponse = new WebQueryResponse<>(); qResponse.setResponseCode(responseCode); qResponse.setCursorId(cursorId); qResponse.setHasMoreBatches(hasMoreBatches); qResponse.setResultList(resultList); return qResponse; } private Class<T> extractPojoImplClassFromType(Type type) { if (type instanceof ParameterizedType) { // fromJson() calls need to pass in the right *parameterized* type token: // example for AgentInformation as T: // Type queryResponseType = new TypeToken<WebQueryResponse<AgentInformation>>() {}.getType(); // gson.fromJson(jsonStr, queryResponseType) Type[] typeParameters = ((ParameterizedType)type).getActualTypeArguments(); Type queryResponseTypeParam = typeParameters[0]; // WebQueryResponse has only one parameterized type T Class<?> pojoClass = (Class<?>)queryResponseTypeParam; if (!Pojo.class.isAssignableFrom(pojoClass)) { throw new IllegalStateException("WebQueryResponse parametrized with non-pojo class: " + pojoClass); } else { @SuppressWarnings("unchecked") // We've just verified it's Pojo assignable. Class<T> retval = (Class<T>)pojoClass; return retval; } } // should-be: write() will be called and only write(). return null; } }