org.apache.streams.sysomos.util.SysomosUtils.java Source code

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Here is the source code for org.apache.streams.sysomos.util.SysomosUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.streams.sysomos.util;

import org.apache.streams.sysomos.SysomosException;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Provides utilities for working with Sysomos.
 */
public class SysomosUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(SysomosUtils.class);

    public static final Pattern CODE_PATTERN = Pattern.compile("code: ([0-9]+)");
    public static final DateTimeFormatter SYSOMOS_DATE_FORMATTER = DateTimeFormat
            .forPattern("yyyy-MM-dd'T'HH:mm:ss'Z'").withZoneUTC();

    private SysomosUtils() {
    }

    /**
     * Queries the sysomos URL and provides the response as a String.
     *
     * @param url the Sysomos URL to query
     * @return valid XML String
     */
    public static String queryUrl(URL url) {
        try {
            HttpURLConnection cn = (HttpURLConnection) url.openConnection();
            cn.setRequestMethod("GET");
            cn.addRequestProperty("Content-Type", "text/xml;charset=UTF-8");
            cn.setDoInput(true);
            cn.setDoOutput(false);
            StringWriter writer = new StringWriter();
            IOUtils.copy(new InputStreamReader(cn.getInputStream()), writer);
            writer.flush();

            String xmlResponse = writer.toString();
            if (StringUtils.isEmpty(xmlResponse)) {
                throw new SysomosException(
                        "XML Response from Sysomos was empty : " + xmlResponse + "\n" + cn.getResponseMessage(),
                        cn.getResponseCode());
            }
            return xmlResponse;
        } catch (IOException ex) {
            LOGGER.error("Error executing request : {}", ex, url.toString());
            String message = ex.getMessage();
            Matcher match = CODE_PATTERN.matcher(message);
            if (match.find()) {
                int errorCode = Integer.parseInt(match.group(1));
                throw new SysomosException(message, ex, errorCode);
            } else {
                throw new SysomosException(ex.getMessage(), ex);
            }
        }
    }
}