com.sangupta.clitools.finance.Currency.java Source code

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Here is the source code for com.sangupta.clitools.finance.Currency.java

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/**
 *
 * clitools - Simple command line tools
 * Copyright (c) 2014-2015, Sandeep Gupta
 * 
 * http://sangupta.com/projects/clitools
 * 
 * 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.sangupta.clitools.finance;

import java.util.Date;
import java.util.List;

import javax.inject.Inject;

import com.google.gson.FieldNamingPolicy;
import com.sangupta.clitools.CliTool;
import com.sangupta.clitools.WebInvoker;
import com.sangupta.jerry.http.WebResponse;
import com.sangupta.jerry.util.AssertUtils;
import com.sangupta.jerry.util.GsonUtils;
import com.sangupta.jerry.util.StringUtils;

import io.airlift.airline.Arguments;
import io.airlift.airline.Command;
import io.airlift.airline.HelpOption;
import io.airlift.airline.SingleCommand;

@Command(name = "curr", description = "Currency converter")
public class Currency implements Runnable, CliTool {

    @Inject
    private HelpOption helpOption;

    @Arguments
    private List<String> arguments;

    public static void main(String[] args) {
        Currency currency = SingleCommand.singleCommand(Currency.class).parse(args);

        if (currency.helpOption.showHelpIfRequested()) {
            return;
        }

        currency.run();
    }

    @Override
    public void run() {
        if (AssertUtils.isEmpty(arguments) || arguments.size() != 2) {
            System.out.println("Two 3-letter currency codes required!");
            return;
        }

        String curr1 = arguments.get(0).toUpperCase();
        String curr2 = arguments.get(1).toUpperCase();

        String url = "http://finance.yahoo.com/webservice/v1/symbols/allcurrencies/quote?format=json";
        WebResponse response = WebInvoker.getResponse(url);
        if (response == null) {
            System.out.println("Unable to connect to internet to fetch currency rates!");
            return;
        }

        if (!response.isSuccess()) {
            System.out.println("Invalid server response!");
            return;
        }

        YahooResponse yr = GsonUtils.getGson(FieldNamingPolicy.IDENTITY).fromJson(response.getContent(),
                YahooResponse.class);
        if (yr == null) {
            System.out.println("Unable to decipher server response!");
            return;
        }

        String curr = curr1 + "/" + curr2;
        for (Resource resource : yr.list.resources) {
            if (curr.equals(resource.resource.fields.name)) {
                System.out.println("Name: " + curr);
                System.out.println("Rate: " + resource.resource.fields.price);
                System.out.println("Timestamp: " + resource.resource.fields.ts);
                long millis = StringUtils.getLongValue(resource.resource.fields.ts, 0) * 1000l;
                if (millis > 0) {
                    System.out.println("Time: " + new Date(millis).toString());
                }

                return;
            }
        }
    }

    private static class YahooResponse {

        public ResponseList list;

    }

    private static class ResponseList {

        public Meta meta;

        public Resource[] resources;

    }

    private static class Meta {

        public String type;

        public int start;

        public int count;
    }

    private static class Resource {

        public ResourceInternal resource;

    }

    private static class ResourceInternal {

        public String className;

        public Fields fields;

    }

    private static class Fields {

        public String name;

        public String price;

        public String symbol;

        public String type;

        public String ts;

        public String utctime;

        public String volume;

    }
}