Examples of org.eclipse.jface.viewers.IBaseLabelProvider

org.eclipse.jface.viewers.IBaseLabelProvider
A label provider maps an element of the viewer's model to an optional image and optional text string used to display the element in the viewer's control. Certain label providers may allow multiple labels per element. This is an "abstract interface", defining methods common to all label providers, but does not actually define the methods to get the label(s) for an element. This interface should never be directly implemented. Most viewers will take either an ILabelProvider or an ITableLabelProvider.
A label provider must not be shared between viewers since a label provider generally manages SWT resources (images), which must be disposed when the viewer is disposed. To simplify life cycle management, the current label provider of a viewer is disposed when the viewer is disposed.

Label providers can be used outside the context of viewers wherever images are needed. When label providers are used in this fashion it is the responsibility of the user to ensure dispose is called when the provider is no longer needed.
@see ILabelProvider @see ITableLabelProvider

            issue2 = (IIssue) e1;
        }


        if (viewer instanceof ContentViewer) {
            ContentViewer tviewer = (ContentViewer) viewer;
            IBaseLabelProvider provider = tviewer.getLabelProvider();
            if (provider instanceof ITableLabelProvider) {
                ITableLabelProvider tableProvider = (ITableLabelProvider) provider;
                String text1 = tableProvider.getColumnText(issue1, IssuesView.columnToIndex(selectedColumn));
                String text2 = tableProvider.getColumnText(issue2, IssuesView.columnToIndex(selectedColumn));
                if (text1 != null && text2 != null) {

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        IConfigurationElement extension = findExtension(extensionId);
        String labelProviderAtt = extension.getAttribute(LABEL_PROVIDER_ATT);
        Color color = null;
        if (labelProviderAtt != null) {
            try {
                IBaseLabelProvider baseProvider = (IBaseLabelProvider) extension
                        .createExecutableExtension(LABEL_PROVIDER_ATT);
                if (baseProvider instanceof IColorProvider) {
                    IColorProvider labelProvider = (IColorProvider) baseProvider;
                    color = labelProvider.getForeground(backingObject);
                }

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        IConfigurationElement extension = findExtension(extensionId);
        String labelProviderAtt = extension.getAttribute(LABEL_PROVIDER_ATT);
        Color color = null;
        if (labelProviderAtt != null) {
            try {
                IBaseLabelProvider baseProvider = (IBaseLabelProvider) extension
                        .createExecutableExtension(LABEL_PROVIDER_ATT);
                if (baseProvider instanceof IColorProvider) {
                    IColorProvider labelProvider = (IColorProvider) baseProvider;
                    color = labelProvider.getBackground(backingObject);
                }

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        IConfigurationElement extension = findExtension(extensionId);
        String labelProviderAtt = extension.getAttribute(LABEL_PROVIDER_ATT);
        Font font = null;
        if (labelProviderAtt != null) {
            try {
                IBaseLabelProvider baseProvider = (IBaseLabelProvider) extension
                        .createExecutableExtension(LABEL_PROVIDER_ATT);
                if (baseProvider instanceof IFontProvider) {
                    IFontProvider labelProvider = (IFontProvider) baseProvider;
                    font = labelProvider.getFont(backingObject);
                }

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        IConfigurationElement extension = findExtension(extensionId);
        String labelProviderAtt = extension.getAttribute(LABEL_PROVIDER_ATT);
        Object image = null;
        if (labelProviderAtt != null) {
            try {
                IBaseLabelProvider baseProvider = (IBaseLabelProvider) extension
                        .createExecutableExtension(LABEL_PROVIDER_ATT);
                if (baseProvider instanceof ILabelProvider) {
                    ILabelProvider labelProvider = (ILabelProvider) baseProvider;
                    image = labelProvider.getImage(backingObject);
                }

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        IConfigurationElement extension = findExtension(extensionId);
        String labelProviderAtt = extension.getAttribute(LABEL_PROVIDER_ATT);
        String text = null;
        if (labelProviderAtt != null) {
            try {
                IBaseLabelProvider baseProvider = (IBaseLabelProvider) extension
                        .createExecutableExtension(LABEL_PROVIDER_ATT);
                if (baseProvider instanceof ILabelProvider) {
                    ILabelProvider labelProvider = (ILabelProvider) baseProvider;
                    text = labelProvider.getText(backingObject);
                }

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    if (getPatterns().length == 0) {
      return true;
    }
    String matchName= null;
    if (viewer instanceof ContentViewer){
      final IBaseLabelProvider labelProvider = ((ContentViewer) viewer).getLabelProvider();
      if (labelProvider instanceof ILabelProvider) {
        matchName = ((ILabelProvider) labelProvider).getText(element);
      }
    }
    if (matchName != null && matchName.length() > 0) {

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            if (viewer == null || !(viewer instanceof ContentViewer)) {
                name1 = e1.toString();
                name2 = e2.toString();
            } else {
                IBaseLabelProvider prov = ((ContentViewer) viewer)
                        .getLabelProvider();
                if (prov instanceof ILabelProvider) {
                    ILabelProvider lprov = (ILabelProvider) prov;
                    name1 = lprov.getText(e1);
                    name2 = lprov.getText(e2);

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   * @see org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
   */
  public int compare(Viewer viewer, Object e1, Object e2) {
    if (viewer instanceof TableViewer) {
      TableViewer tableViewer = (TableViewer) viewer;
      IBaseLabelProvider baseLabel = tableViewer.getLabelProvider();
      if (baseLabel instanceof ITableLabelProvider) {
        ITableLabelProvider tableProvider = (ITableLabelProvider) baseLabel;
        String e1p = tableProvider.getColumnText(e1, sortColumn);
        String e2p = tableProvider.getColumnText(e2, sortColumn);
        int result = getComparator().compare(e1p, e2p);

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    }
    super.setValue(target, value);
  }
  
  protected boolean hasDefaultLabelProvider(ContentViewer viewer ) {
    IBaseLabelProvider labelProvider = viewer.getLabelProvider();
    return (labelProvider == null || labelProvider.getClass() == DefaultViewerLabelProvider.class);
  }

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