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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;
import com.google.common.base.Preconditions;

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

  /** Atom namespace. */
  public static final String ATOM_NAMESPACE = "http://www.w3.org/2005/Atom";

  /** Atom content type. */
  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() {
  }

  /**
   * Checks the given content type matches the Atom content type specified in {@link #CONTENT_TYPE}.
   *
   * @throws IllegalArgumentException if content type doesn't match
   */
  public static void checkContentType(String contentType) {
    Preconditions.checkArgument(contentType != null && contentType.startsWith(CONTENT_TYPE),
        "Wrong content type: expected <" + CONTENT_TYPE + "> but got <%s>", contentType);
  }
}