org.rstudio.studio.client.workbench.views.presentation.PresentationDispatcher.java Source code

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Here is the source code for org.rstudio.studio.client.workbench.views.presentation.PresentationDispatcher.java

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/*
 * PresentationDispatcher.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */

package org.rstudio.studio.client.workbench.views.presentation;

import org.rstudio.core.client.FilePosition;
import org.rstudio.core.client.StringUtil;
import org.rstudio.core.client.files.FileSystemItem;
import org.rstudio.studio.client.application.events.EventBus;
import org.rstudio.studio.client.common.filetypes.FileTypeRegistry;
import org.rstudio.studio.client.common.filetypes.TextFileType;
import org.rstudio.studio.client.common.filetypes.events.OpenPresentationSourceFileEvent;
import org.rstudio.studio.client.workbench.views.presentation.model.PresentationCommand;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.inject.Inject;

public class PresentationDispatcher {
    @Inject
    public PresentationDispatcher(EventBus eventBus, FileTypeRegistry fileTypeRegistry) {
        eventBus_ = eventBus;
        fileTypeRegistry_ = fileTypeRegistry;
    }

    public interface Context {
        void pauseMedia();

        String getPresentationFilePath();
    }

    public void setContext(Context context) {
        context_ = context;
    }

    public void dispatchCommand(JavaScriptObject jsCommand) {
        // cast
        PresentationCommand command = jsCommand.cast();

        // crack parameters
        String param1 = null, param2 = null;
        String params = command.getParams();
        if (params.length() > 0) {
            // find the first space and split on that
            int spaceLoc = params.indexOf(' ');
            if (spaceLoc == -1) {
                param1 = params;
            } else {
                param1 = params.substring(0, spaceLoc);
                param2 = params.substring(spaceLoc + 1);
            }
        }

        String cmdName = command.getName().toLowerCase();

        if (cmdName.equals("source"))
            performSourceCommand(param1, param2);
        else
            performOtherCommand(cmdName, params, param1, param2);
    }

    private void performSourceCommand(String param1, String param2) {
        if (param1 != null) {
            // get filename and type
            FileSystemItem file = FileSystemItem.createFile(getPresentationPath(param1));
            TextFileType fileType = fileTypeRegistry_.getTextTypeForFile(file);

            // check for a file position and/or pattern
            FilePosition pos = null;
            String pattern = null;
            if (param2 != null) {
                if (param2.length() > 2 && param2.startsWith("/") && param2.endsWith("/")) {
                    pattern = param2.substring(1, param2.length() - 1);
                } else {
                    int line = StringUtil.parseInt(param2, 0);
                    if (line > 0)
                        pos = FilePosition.create(line, 1);
                }
            }

            // dispatch
            fireOpenSourceFileEvent(new OpenPresentationSourceFileEvent(file, fileType, pos, pattern));
        }
    }

    protected void performOtherCommand(String cmdName, String params, String param1, String param2) {
    }

    protected void fireOpenSourceFileEvent(OpenPresentationSourceFileEvent event) {
        eventBus_.fireEvent(event);
    }

    protected String getPresentationPath(String file) {
        FileSystemItem presentationFile = FileSystemItem.createFile(context_.getPresentationFilePath());
        return presentationFile.getParentPath().completePath(file);
    }

    protected Context context_;
    protected final EventBus eventBus_;
    protected final FileTypeRegistry fileTypeRegistry_;
}