LookupTableMultiPageEditor.java

package uk.ac.gda.lookuptable.editor;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.IPageChangedListener;
import org.eclipse.jface.dialogs.PageChangedEvent;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.editors.text.TextEditor;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.MultiPageEditorPart;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * An example showing how to create a multi-page editor. This example has 3 pages:
 * <ul>
 * <li>page 0 contains a nested text editor.
 * <li>page 1 allows you to change the font used in page 2
 * <li>page 2 shows the words in page 0 in sorted order
 * </ul>
 */
public class LookupTableMultiPageEditor extends MultiPageEditorPart implements IResourceChangeListener {

	private static final Logger logger = LoggerFactory.getLogger(LookupTableMultiPageEditor.class);

	/** The text editor used in page 0. */
	private TextEditor editor;

	private LookupTableEditor lookupTeditor;

	/**
	 * Creates a multi-page editor example.
	 */
	public LookupTableMultiPageEditor() {
		super();
		ResourcesPlugin.getWorkspace().addResourceChangeListener(this);
	}

	/**
	 * Creates page 0 of the multi-page editor, which contains a text editor.
	 */
	private void createTextView() {
		try {
			editor = new TextEditor();
			int index = addPage(editor, getEditorInput());
			setPageText(index, "Text View");
		} catch (PartInitException e) {
			ErrorDialog.openError(getSite().getShell(), "Error creating nested text editor", null, e.getStatus());
		}
	}

	@Override
	public String getPartName() {
		return editor.getTitle();
	}

	public static class ColumnLabelProviderCustom extends ColumnLabelProvider {
		private final int index;

		public ColumnLabelProviderCustom(int index) {
			this.index = index;
		}

		public int getIndex() {
			return index;
		}
	}

	/**
	 * Creates page 2 of the multi-page editor, which shows the sorted text.
	 */
	private void createTableView() {
		try {
			lookupTeditor = new LookupTableEditor();
			int index = addPage(lookupTeditor, getEditorInput());
			addPageChangedListener(new IPageChangedListener() {

				@Override
				public void pageChanged(PageChangedEvent event) {
					if (event.getSelectedPage().equals(lookupTeditor)) {
						String editorText = editor.getDocumentProvider().getDocument(editor.getEditorInput()).get();
						try {
				            InputStream is = new ByteArrayInputStream(editorText.getBytes("UTF-8"));
				            lookupTeditor.refresh(is);
				            
				        } catch (UnsupportedEncodingException e) {
				            e.printStackTrace();
				        }
					}
				}
			});

			setPageText(index, "Table View");
		} catch (PartInitException e) {
			ErrorDialog.openError(getSite().getShell(), "Error creating nested text editor", null, e.getStatus());
		}
	}

	/**
	 * Creates the pages of the multi-page editor.
	 */
	@Override
	protected void createPages() {
		createTableView();
		createTextView();
	}

	/**
	 * The <code>MultiPageEditorPart</code> implementation of this <code>IWorkbenchPart</code> method disposes all
	 * nested editors. Subclasses may extend.
	 */
	@Override
	public void dispose() {
		ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
		super.dispose();
	}

	/**
	 * Saves the multi-page editor's document.
	 */
	@Override
	public void doSave(IProgressMonitor monitor) {
		getEditor(getActivePage()).doSave(monitor);
	}

	/**
	 * Saves the multi-page editor's document as another file. Also updates the text for page 0's tab, and updates this
	 * multi-page editor's input to correspond to the nested editor's.
	 */
	@Override
	public void doSaveAs() {
		IEditorPart editor = getEditor(1);
		editor.doSaveAs();
		setInput(editor.getEditorInput());
	}

	/*
	 * (non-Javadoc) Method declared on IEditorPart
	 */
	public void gotoMarker(IMarker marker) {
		setActivePage(0);
		IDE.gotoMarker(getEditor(1), marker);
	}

	/**
	 * The <code>MultiPageEditorExample</code> implementation of this method checks that the input is an instance of
	 * <code>IFileEditorInput</code>.
	 */
	@Override
	public void init(IEditorSite site, IEditorInput editorInput) throws PartInitException {
		if (!(editorInput instanceof IFileEditorInput))
			throw new PartInitException("Invalid Input: Must be IFileEditorInput");
		super.init(site, editorInput);
	}

	/*
	 * (non-Javadoc) Method declared on IEditorPart.
	 */
	@Override
	public boolean isSaveAsAllowed() {
		return true;
	}

	/**
	 * Calculates the contents of page 2 when the it is activated.
	 */
	@Override
	protected void pageChange(int newPageIndex) {
		super.pageChange(newPageIndex);
	}

	/**
	 * Closes all project files on project close.
	 */
	@Override
	public void resourceChanged(final IResourceChangeEvent event) {
		if (event.getType() == IResourceChangeEvent.PRE_CLOSE) {
			Display.getDefault().asyncExec(new Runnable() {
				@Override
				public void run() {
					IWorkbenchPage[] pages = getSite().getWorkbenchWindow().getPages();
					for (int i = 0; i < pages.length; i++) {
						if (((FileEditorInput) editor.getEditorInput()).getFile().getProject()
								.equals(event.getResource())) {
							IEditorPart editorPart = pages[i].findEditor(editor.getEditorInput());
							pages[i].closeEditor(editorPart, true);
						}
					}
				}
			});
		}
	}

}