com.discursive.jccook.collections.lazy.StockQuoteTransformer.java Source code

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Here is the source code for com.discursive.jccook.collections.lazy.StockQuoteTransformer.java

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/* 
 * ========================================================================
 * 
 * Copyright 2005 Tim O'Brien.
 *
 * 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.discursive.jccook.collections.lazy;

import java.net.URL;

import org.apache.commons.collections.Transformer;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpURL;
import org.apache.commons.httpclient.methods.GetMethod;

public class StockQuoteTransformer implements Transformer {

    protected URL quoteURL;
    protected long timeout;

    public Object transform(Object symbol) {
        QuoteRetriever retriever = new QuoteRetriever((String) symbol);

        try {
            Thread retrieveThread = new Thread(retriever);
            retrieveThread.start();
            retrieveThread.join(timeout);
        } catch (InterruptedException ie) {
            System.out.println("Quote request timed out.");
        }

        return retriever.getResult();
    }

    public URL getQuoteURL() {
        return quoteURL;
    }

    public void setQuoteURL(URL url) {
        quoteURL = url;
    }

    public long getTimeout() {
        return timeout;
    }

    public void setTimeout(long l) {
        timeout = l;
    }

    public class QuoteRetriever implements Runnable {
        private String symbol;
        private Float result = new Float(Float.NaN);

        public QuoteRetriever(String symbol) {
            this.symbol = symbol;
        }

        public Float getResult() {
            return result;
        }

        public void run() {
            HttpClient client = new HttpClient();
            try {
                HttpURL url = new HttpURL(quoteURL.toString());
                url.setQuery("symbol", symbol);

                GetMethod getMethod = new GetMethod(url.toString());
                client.executeMethod(getMethod);
                String response = getMethod.getResponseBodyAsString();

                result = new Float(response);
            } catch (Exception e) {
                System.out.println("Error retrieving quote");
            }
        }

    }
}