user/src/com/google/gwt/resources/rebind/context/InlineResourceContext.java

/*
 * Copyright 2008 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.gwt.resources.rebind.context;

import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;

class InlineResourceContext extends StaticResourceContext {
  /**
   * String constants in Java have a maximum limit that we must obey.
   */
  public static final int MAX_ENCODED_SIZE = (2 << 15) - 1;

  InlineResourceContext(TreeLogger logger, GeneratorContext context,
      JClassType resourceBundleType, ClientBundleContext clientBundleCtx) {
    super(logger, context, resourceBundleType, clientBundleCtx);
  }

  @Override
  public String deploy(String suggestedFileName, String mimeType, byte[] data,
      boolean forceExternal) throws UnableToCompleteException {
    TreeLogger logger = getLogger();

    // data: URLs are not compatible with XHRs on FF and Safari browsers
    if ((!forceExternal) && (data.length < MAX_INLINE_SIZE)) {
      logger.log(TreeLogger.DEBUG, "Inlining", null);

      String base64Contents = toBase64(data);

      // CHECKSTYLE_OFF
      String encoded = "\"data:" + mimeType.replaceAll("\"", "\\\\\"")
          + ";base64," + base64Contents + "\"";
      // CHECKSTYLE_ON

      /*
       * We know that the encoded format will be one byte per character, since
       * we're using only ASCII characters.
       */
      if (encoded.length() < MAX_ENCODED_SIZE) {
        return encoded;
      }
    }

    return super.deploy(suggestedFileName, mimeType, data, true);
  }

  @Override
  public boolean supportsDataUrls() {
    return true;
  }
}