bundles/org.simantics.help.ui/src/org/simantics/help/ui/HelpFileDocumentProvider.java

   1 package org.simantics.help.ui;
   2
   3 import java.io.PrintWriter;
   4 import java.io.StringWriter;
   5
   6 import org.eclipse.core.runtime.CoreException;
   7 import org.eclipse.core.runtime.IProgressMonitor;
   8 import org.eclipse.jface.operation.IRunnableContext;
   9 import org.eclipse.jface.text.Document;
  10 import org.eclipse.jface.text.IDocument;
  11 import org.eclipse.jface.text.source.IAnnotationModel;
  12 import org.eclipse.ui.texteditor.AbstractDocumentProvider;
  13 import org.simantics.Simantics;
  14 import org.simantics.databoard.Bindings;
  15 import org.simantics.db.ReadGraph;
  16 import org.simantics.db.Resource;
  17 import org.simantics.db.WriteGraph;
  18 import org.simantics.db.common.request.UniqueRead;
  19 import org.simantics.db.common.request.WriteRequest;
  20 import org.simantics.db.exception.DatabaseException;
  21 import org.simantics.db.layer0.util.Layer0Utils;
  22 import org.simantics.help.core.HelpUtils;
  23 import org.simantics.layer0.Layer0;
  24 import org.simantics.ui.workbench.IResourceEditorInput;
  25 import org.simantics.utils.logging.TimeLogger;
  26
  27 public class HelpFileDocumentProvider extends AbstractDocumentProvider {
  28
  29     private Resource resource;
  30     private String currentText;
  31     private boolean errorHappened;
  32
  33     @Override
  34     protected IDocument createDocument(Object element) throws CoreException {
  35         IResourceEditorInput input = (IResourceEditorInput) element;
  36         resource = input.getResource();
  37         try {
  38             return Simantics.getSession().syncRequest(new UniqueRead<Document>() {
  39                 @Override
  40                 public Document perform(ReadGraph graph) throws DatabaseException {
  41                     currentText = HelpUtils.readHelpFileContents(graph, resource);
  42                     errorHappened = false;
  43                     return new Document(currentText != null ? currentText : ""); //$NON-NLS-1$
  44                 }
  45             });
  46         } catch (DatabaseException e) {
  47             StringWriter sw = new StringWriter();
  48             PrintWriter pw = new PrintWriter(sw);
  49             e.printStackTrace(pw);
  50             errorHappened = true;
  51             return new Document(sw.toString());
  52         }
  53     }
  54
  55     @Override
  56     protected IAnnotationModel createAnnotationModel(Object element) throws CoreException {
  57         return null;
  58     }
  59
  60     @Override
  61     protected void doSaveDocument(IProgressMonitor monitor, Object element, IDocument document, boolean overwrite) throws CoreException {
  62         TimeLogger.resetTimeAndLog("HelpFileDocumentProvider.doSaveDocument"); //$NON-NLS-1$
  63         currentText = document.get();
  64         Simantics.getSession().asyncRequest(new WriteRequest() {
  65             @Override
  66             public void perform(WriteGraph graph) throws DatabaseException {
  67                 graph.markUndoPoint();
  68                 HelpUtils.saveHelpFileContents(graph, resource, currentText);
  69                 Layer0Utils.addCommentMetadata(graph, "Saved SCL Module " + graph.getRelatedValue2(resource, Layer0.getInstance(graph).HasName, Bindings.STRING)); //$NON-NLS-1$
  70             }
  71         });
  72     }
  73
  74     @Override
  75     protected IRunnableContext getOperationRunner(IProgressMonitor monitor) {
  76         return null;
  77     }
  78
  79     @Override
  80     public boolean isModifiable(Object element) {
  81         return !errorHappened;
  82     }
  83
  84     @Override
  85     public boolean isReadOnly(Object element) {
  86         return errorHappened;
  87     }
  88
  89     @Override
  90     public boolean canSaveDocument(Object element) {
  91         return !errorHappened && !getDocument(element).get().equals(currentText);
  92     }
  93
  94 }