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<copyright> Copyright (c) 2012 Springsite BV (The Netherlands) and others All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at Contributors: Martin Taal - Initial API and implementation Dzmitry [zmicer] Harachka - implementation </copyright> $Id:,v 1.6 2011/08/27 05:40:32 mtaal Exp $
package org.eclipse.emf.texo.resolver;
import  org.eclipse.emf.common.util.URI;

An ObjectResolver which reads referenced objects using the url, through a webservice.

Martin Taal
public abstract class WebServiceObjectResolver extends DefaultObjectResolver {
  private final Map<StringObjectobjectCache = new HashMap<StringObject>();
  public Object fromUri(URI objectUri) {
    final String urlStr = objectUri.toString();
    if (.containsKey(urlStr)) {
      return .get(urlStr);
    try {
      final Object result = readObject(urlStr);
      if (result != null) {
        return result;
    } catch (Exception e) {
      throw new IllegalStateException(e);
    return super.fromUri(objectUri);
  protected Object readObject(String urlStrthrows Exception {
    final HttpURLConnection hc = createConnection(urlStr);
    final InputStream is = hc.getInputStream();
    final StringBuilder sb = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(is"UTF-8")); //$NON-NLS-1$
    String line;
    while ((line = reader.readLine()) != null) {
      sb.append(line).append("\n"); //$NON-NLS-1$
    return deserialize(urlStrsb.toString());
  protected abstract Object deserialize(String urlStringString content);
  protected HttpURLConnection createConnection(String urlStrthrows Exception {
    final URL url = new URL(urlStr);
    final HttpURLConnection hc = (HttpURLConnectionurl.openConnection();
    hc.setRequestMethod("GET"); //$NON-NLS-1$
    return hc;
  public Map<StringObjectgetObjectCache() {
    return ;
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