io.macgyver.plugin.chat.ChatBot.java Source code

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Here is the source code for io.macgyver.plugin.chat.ChatBot.java

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/**
 * 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 io.macgyver.plugin.chat;

import io.macgyver.plugin.hipchat.HelpCommand;
import io.macgyver.plugin.hipchat.HipChatBotContext;

import java.util.Map;
import java.util.Optional;

import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

public abstract class ChatBot {

    private Map<String, ChatBotCommand> commandMap = Maps.newConcurrentMap();

    public ChatBot() {
        register(new HelpCommand());
    }

    public void register(ChatBotCommand cmd) {
        this.commandMap.put(cmd.getCommand(), cmd);
    }

    public abstract ChatBotContext createContext(ChatBot bot, JsonNode n);

    public Map<String, ChatBotCommand> getCommands() {
        return ImmutableMap.copyOf(commandMap);
    }

    public final void dispatch(JsonNode n) {

        ChatBotContext ctx = createContext(this, n);

        Optional<ChatBotCommand> cmd = findCommand(ctx);

        if (cmd.isPresent()) {
            cmd.get().handle(ctx);
        } else {
            String command = ctx.getCommand();
            handleUnknownCommand(ctx);

        }
    }

    public Optional<ChatBotCommand> findCommand(String cmd) {
        if (cmd == null) {
            return Optional.empty();
        }
        return Optional.ofNullable(commandMap.get(cmd));
    }

    public Optional<ChatBotCommand> findCommand(ChatBotContext ctx) {
        if (ctx == null) {
            return Optional.empty();
        }

        return findCommand(ctx.getCommand());

    }

    protected void handleUnknownCommand(ChatBotContext ctx) {
        ctx.respond("unknown command: " + ctx.getCommand() + ". Type /help for help with commands");
    }
}