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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */
package thredds.util;

import ucar.httpservices.*;
import org.apache.http.Header;

import java.io.*;
import java.net.URI;
import java.util.zip.GZIPInputStream;
import java.util.zip.InflaterInputStream;
import java.util.Map;
import java.util.HashMap;

/**
 * wrapper around HTTPMethod
 *
 * @author edavis
 * @since 4.0
 */
public class HttpUriResolver {
  private org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HttpUriResolver.class);

  private URI uri;
  private int connectionTimeout;
  private int socketTimeout;
  private String contentEncoding = "gzip,deflate";
  private boolean allowContentEncoding;
  private boolean followRedirects;

  private HTTPMethod method = null;
  private Map respHeaders;

  HttpUriResolver(URI uri, int connectionTimeout, int socketTimeout,
                  boolean allowContentEncoding, boolean followRedirects) {

    if (!uri.getScheme().equalsIgnoreCase("http"))
      throw new IllegalArgumentException("Given a Non-HTTP URI [" + uri.toString() + "].");

    this.uri = uri;
    this.connectionTimeout = connectionTimeout;
    this.socketTimeout = socketTimeout;
    this.allowContentEncoding = allowContentEncoding;
    this.followRedirects = followRedirects;
  }

  public void close() {
    if (method != null) method.close();
  }

  public URI getUri() {
    return this.uri;
  }

  public long getConnectionTimeout() {
    return this.connectionTimeout;
  }

  public int getSocketTimeout() {
    return this.socketTimeout;
  }

  public String getContentEncoding() {
    return this.contentEncoding;
  }

  public boolean getAllowContentEncoding() {
    return this.allowContentEncoding;
  }

  public boolean getFollowRedirects() {
    return this.followRedirects;
  }

  public void makeRequest() throws IOException {
    if (method != null)
      throw new IllegalStateException("Request already made.");

    this.method = getHttpResponse(uri);
  }

  public int getResponseStatusCode() {
    if (method == null)
      throw new IllegalStateException("Request has not been made.");
    return this.method.getStatusCode();
  }

  public String getResponseContentType() {
    return getResponseHeaderValue("Content-Type");
  }

  public String getResponseStatusText() {
    if (method == null)
      throw new IllegalStateException("Request has not been made.");
    return this.method.getStatusText();
  }

  public Map getResponseHeaders() {
    if (method == null)
      throw new IllegalStateException("Request has not been made.");

    if (this.respHeaders == null) {
      this.respHeaders = new HashMap();
      Header[] headers = this.method.getResponseHeaders();
      for (Header h : headers)
        this.respHeaders.put(h.getName(), h.getValue());
    }

    return respHeaders;
  }

  public String getResponseHeaderValue(String name) {
    if (method == null)
      throw new IllegalStateException("Request has not been made.");

    Header responseHeader = this.method.getResponseHeader(name);
    return responseHeader == null ? null : responseHeader.getValue();
  }

  public InputStream getResponseBodyAsInputStream() throws IOException {
    if (method == null)
      throw new IllegalStateException("Request has not been made.");

    InputStream is = method.getResponseAsStream();
    Header contentEncodingHeader = method.getResponseHeader("Content-Encoding");
    if (contentEncodingHeader != null) {
      String contentEncoding = contentEncodingHeader.getValue();
      if (contentEncoding != null) {
        if (contentEncoding.equalsIgnoreCase("gzip"))
          return new GZIPInputStream(is);
        else if (contentEncoding.equalsIgnoreCase("deflate"))
          return new InflaterInputStream(is);
      }
    }
    return is;
  }

  private HTTPMethod getHttpResponse(URI uri) throws IOException {

    HTTPMethod method = null;
    try {
      method = HTTPFactory.Get(uri.toString());
      method.getSession().setConnectionTimeout(this.connectionTimeout);
      method.getSession().setSoTimeout(this.socketTimeout);
      method.setFollowRedirects(this.followRedirects);
      method.setRequestHeader("Accept-Encoding", this.contentEncoding);

      method.execute();
      int statusCode = method.getStatusCode();
      if (statusCode == 200 || statusCode == 201) {
        return method;
      }

      method.execute();
      return method;

    } catch (Throwable t) {
      if (method != null) method.close();
      throw t;
    }
  }
}