tud.time4maps.request.CapabilitiesRequest.java Source code

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Here is the source code for tud.time4maps.request.CapabilitiesRequest.java

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/**
 * Copyright 2012 Geoinformation Systems, TU Dresden
 * 
 * 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 tud.time4maps.request;

/* 
 * The source code of the class is used from Apache web examples.
 * 
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

/**   
 * This class handles WMS requests. 
 */
public class CapabilitiesRequest {

    /**
     * This method is called by class RequestControlling and handles WMS requests.
     * 
     * @param wmsUrl - the wms request url
     * @return response document 
     */
    public static Document doRequest(String wmsUrl) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // factory.setNamespaceAware( true ); factory.setValidating( true );
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            return builder.parse(new ByteArrayInputStream(getResponseString(wmsUrl).getBytes()));
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String doRequest_Plain(String wmsUrl) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // factory.setNamespaceAware( true ); factory.setValidating( true );
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            return getResponseString(wmsUrl);
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * This method handles http get request and returns response string.
     * 
     * @param wmsUrl - the wms request url
     * @return response document 
     */
    public static String getResponseString(String wmsUrl) {
        HttpClient httpclient = new DefaultHttpClient();

        try {
            String responseBody = "";
            HttpGet httpget = new HttpGet(wmsUrl);

            // Create a response handler
            BasicResponseHandler responseHandler = new BasicResponseHandler();
            try {
                responseBody = httpclient.execute(httpget, responseHandler);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            responseBody = responseBody.replaceAll("\\(", "");
            responseBody = responseBody.replaceAll("\\)", "");

            responseBody = responseBody.replaceAll("\\<\\?xml version=\"1.0\" encoding=\"UTF-8\"\\?\\>", "");
            responseBody = responseBody.replaceAll("\\<!\\[CDATA\\[", "");
            responseBody = responseBody.replaceAll("\\]\\]\\>", "");
            responseBody = responseBody.replaceAll("\\", "");

            return responseBody;
        } finally {

            // When HttpClient instance is no longer needed,
            // shut down the connection manager to ensure
            // immediate deallocation of all system resources
            httpclient.getConnectionManager().shutdown();
        }
    }

    /**
     * This method is a help method to print xml documents on console.
     * 
     * @param doc - the document, that should be printed on console
     */
    public static void printXML(Document doc) {
        try {
            DOMSource source = new DOMSource(doc);
            StringWriter writer = new StringWriter();
            StreamResult result = new StreamResult(writer);
            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer transformer;

            transformer = factory.newTransformer();
            transformer.transform(source, result);
        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }
}