cn.dreampie.common.web.resource.HttpResource Maven / Gradle / Ivy

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package cn.dreampie.common.web.resource;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by wangrenhui on 2014/7/11.
 */
public class HttpResource implements Resource {

  URI url;

  public HttpResource(String url) throws URISyntaxException {
    this.url = new URI(url);
  }

  public HttpResource(URI url) {
    this.url = url;
  }

  public boolean exists() {
    try {
      URL u = url.toURL();
      URLConnection connection = u.openConnection();
      connection.connect();
      return true;
    } catch (IOException e) {
      return false;
    }
  }

  public long lastModified() {
    try {
      URL u = url.toURL();
      URLConnection connection = u.openConnection();
      return connection.getLastModified();
    } catch (IOException e) {
      return 0;
    }
  }

  public InputStream getInputStream() throws IOException {
    return url.toURL().openStream();
  }

  public Resource createRelative(String relativeResourcePath) throws IOException {
    try {
      return new HttpResource(url.resolve(new URI(relativeResourcePath)));
    } catch (URISyntaxException e) {
      throw (IOException) new IOException("Could not resolve " + url + " against " + relativeResourcePath).initCause(e);
    }
  }

  public String getName() {
    return url.toASCIIString();
  }
}