Package com.google.gwt.libideas.resources.rg

Source Code of com.google.gwt.libideas.resources.rg.ImageResourceGenerator

/*
* 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.libideas.resources.rg;

import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.libideas.resources.client.impl.ImageResourcePrototype;
import com.google.gwt.libideas.resources.rebind.ResourceContext;
import com.google.gwt.libideas.resources.rebind.ResourceGenerator;
import com.google.gwt.libideas.resources.rebind.ResourceGeneratorUtil;
import com.google.gwt.libideas.resources.rg.ImageBundleBuilder.ImageRect;
import com.google.gwt.user.rebind.SourceWriter;

import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
* Builds an image strip for all ImageResources defined within an
* ImmutableResourceBundle.
*/
public final class ImageResourceGenerator extends ResourceGenerator {
  private ResourceContext context;
  private ImageBundleBuilder builder;
  private Map<String, String> externalLocationExpressions;
  private Map<String, ImageRect> externalImageRects;
  private int imageStripCount;

  @Override
  public void init(TreeLogger logger, ResourceContext context) {
    this.context = context;
    builder = new ImageBundleBuilder();
    externalLocationExpressions = new HashMap<String, String>();
    externalImageRects = new HashMap<String, ImageRect>();
    imageStripCount = 0;
  }

  @Override
  public void prepare(TreeLogger logger, JMethod method)
      throws UnableToCompleteException {
    URL[] resources = ResourceGeneratorUtil.findResources(logger, context,
        method);

    if (resources.length != 1) {
      logger.log(TreeLogger.ERROR, "Exactly one image may be specified", null);
      throw new UnableToCompleteException();
    }

    URL resource = resources[0];
    String name = method.getName();

    try {
      builder.assimilate(logger, name, resource);
      imageStripCount++;
    } catch (UnsuitableForStripException e) {
      // Add the image to the output as a separate resource
      String urlExpression = context.addToOutput(resource, false);
      externalLocationExpressions.put(name, urlExpression);
      externalImageRects.put(name, e.getImageRect());
    }
  }

  @Override
  public void writeAssignment(TreeLogger logger, JMethod method)
      throws UnableToCompleteException {
    String name = method.getName();

    SourceWriter sw = context.getSourceWriter();
    sw.println("new " + ImageResourcePrototype.class.getName() + "(");
    sw.indent();
    sw.println('"' + name + "\",");

    ImageBundleBuilder.ImageRect rect;
    if (!externalImageRects.containsKey(name)) {
      // This is a reference to a field
      sw.println("imageResourceBundleUrl,");
      rect = builder.getMapping(method.getName());
    } else {
      sw.println(externalLocationExpressions.get(name).toString() + ", ");
      rect = externalImageRects.get(name);
    }

    if (rect == null) {
      logger.log(TreeLogger.ERROR, "No ImageRect ever computed for " + name,
          null);
      throw new UnableToCompleteException();
    }

    sw.println(rect.left + ", 0, " + rect.width + ", " + rect.height);

    sw.outdent();
    sw.print(")");
  }

  @Override
  public void writeFields(TreeLogger logger) throws UnableToCompleteException {
    if (imageStripCount > 0) {
      String bundleUrlExpression = builder.writeBundledImage(logger.branch(
          TreeLogger.DEBUG, "Writing image strip", null), context);

      SourceWriter sw = context.getSourceWriter();
      sw.println("private String imageResourceBundleUrl = "
          + bundleUrlExpression + ";");
    }
  }
}
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