Java tutorial
/* * Copyright 2015-present Facebook, 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 com.facebook.buck.intellij.plugin.ws.buckevents; import com.google.common.collect.ImmutableMap; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonParseException; import com.google.gson.JsonObject; import com.google.gson.JsonPrimitive; import java.lang.reflect.Type; public class BuckEventAdapter implements JsonDeserializer<BuckEventInterface> { static final ImmutableMap<String, Class<? extends BuckEventBase>> MAPPINGS = ImmutableMap .<String, Class<? extends BuckEventBase>>builder() .put(BuckEventBuildStart.EVENT_TYPE, BuckEventBuildStart.class) .put(BuckEventBuildParseStart.EVENT_TYPE, BuckEventBuildParseStart.class) .put(BuckEventBuildParseEnd.EVENT_TYPE, BuckEventBuildParseEnd.class) .put(BuckEventBuildRules.EVENT_TYPE, BuckEventBuildRules.class) .put(BuckEventBuildRuleStarted.EVENT_TYPE, BuckEventBuildRuleStarted.class) .put(BuckEventBuildRuleSuspended.EVENT_TYPE, BuckEventBuildRuleSuspended.class) .put(BuckEventBuildRuleResumed.EVENT_TYPE, BuckEventBuildRuleResumed.class) .put(BuckEventBuildRuleFinished.EVENT_TYPE, BuckEventBuildRuleFinished.class) .put(BuckEventBuildFinished.EVENT_TYPE, BuckEventBuildFinished.class) .put(BuckEventCompilerError.EVENT_TYPE, BuckEventCompilerError.class).build(); @Override public BuckEventInterface deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException { JsonObject jsonObject = jsonElement.getAsJsonObject(); JsonPrimitive prim = (JsonPrimitive) jsonObject.get("type"); String typeFromJSON = prim.getAsString(); if (MAPPINGS.containsKey(typeFromJSON)) { return jsonDeserializationContext.deserialize(jsonElement, MAPPINGS.get(typeFromJSON)); } return jsonDeserializationContext.deserialize(jsonElement, BuckEventUnknown.class); } }