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Google API Client Library for Java. Supports Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

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/*
 * Copyright (c) 2010 Google Inc.
 * 
 * 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 com.google.api.client.xml.atom;

import com.google.api.client.xml.Xml;

/**
 * @since 1.0
 * @author Yaniv Inbar
 */
public final class Atom {

  public static final String ATOM_NAMESPACE = "http://www.w3.org/2005/Atom";
  public static final String CONTENT_TYPE = "application/atom+xml";

  static final class StopAtAtomEntry extends Xml.CustomizeParser {

    static final StopAtAtomEntry INSTANCE = new StopAtAtomEntry();

    @Override
    public boolean stopBeforeStartTag(String namespace, String localName) {
      return "entry".equals(localName) && ATOM_NAMESPACE.equals(namespace);
    }
  }

  private Atom() {
  }

  public static void checkContentType(String contentType) {
    if (contentType == null || !contentType.startsWith(CONTENT_TYPE)) {
      throw new IllegalArgumentException("Wrong content type: expected <"
          + CONTENT_TYPE + "> but got <" + contentType + ">");
    }
  }
}