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package app.chameleon.sample.linker;
import com.google.gwt.core.ext.LinkerContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.linker.AbstractLinker;
import com.google.gwt.core.ext.linker.ArtifactSet;
import com.google.gwt.core.ext.linker.EmittedArtifact;
import com.google.gwt.core.ext.linker.LinkerOrder;
import com.google.gwt.core.ext.linker.LinkerOrder.Order;

@LinkerOrder(Order.POST)
public class AppCacheLinker extends AbstractLinker {

@Override
public String getDescription() {
    return "Offline Linker";
}

@Override
  public ArtifactSet link(TreeLogger logger, LinkerContext context,ArtifactSet artifacts) throws UnableToCompleteException {
    ArtifactSet artifactset = new ArtifactSet(artifacts);

    StringBuilder builder= new StringBuilder("CACHE MANIFESTn");
    builder.append("# Cache Version 10n");
    builder.append("CACHE:n");

    builder.append("/demo/ChameleonSample.cssn");
    builder.append("/demo/ChameleonSample.htmln");
    for(EmittedArtifact emitted: artifacts.find(EmittedArtifact.class))
    {
        if(emitted.isPrivate())
        {
            continue;
        }
        if(emitted.getPartialPath().endsWith(".symbolMap"))continue;
        if(emitted.getPartialPath().endsWith(".txt"))continue;
        builder.append("/demo/chameleonsample/" + emitted.getPartialPath()).append("n");
    }
    builder.append("/demo/chameleonsample/hosted.htmln");
    builder.append("/demo/chameleonsample/chameleonsample.nocache.jsn");
    builder.append("NETWORK:n");
    builder.append("*n");
    EmittedArtifact manifest= emitString(logger, builder.toString(), "offline.appcache");
    artifactset.add(manifest);
    return artifactset;
  }
}

<html manifest="chameleonsample/offline.appcache">

<mime-mapping>
     <extension>appcache</extension>
     <mime-type>text/cache-manifest</mime-type>
 </mime-mapping>