Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package net.sourceforge.c4jplugin.internal.ui.contracthierarchy; import net.sourceforge.c4jplugin.C4JActivator; import org.eclipse.jdt.core.Flags; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IMethod; import org.eclipse.jdt.core.IType; import org.eclipse.jdt.internal.ui.JavaPlugin; import org.eclipse.jdt.internal.ui.JavaPluginImages; import org.eclipse.jdt.internal.ui.viewsupport.AppearanceAwareLabelProvider; import org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider; import org.eclipse.jdt.ui.JavaElementImageDescriptor; import org.eclipse.jdt.ui.JavaElementLabels; import org.eclipse.jface.resource.CompositeImageDescriptor; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.widgets.Display; /** * Label provider for the hierarchy viewers. Types in the hierarchy that are not belonging to the * input scope are rendered differntly. */ public class HierarchyLabelProvider extends AppearanceAwareLabelProvider { private static class FocusDescriptor extends CompositeImageDescriptor { private ImageDescriptor fBase; public FocusDescriptor(ImageDescriptor base) { fBase = base; } protected void drawCompositeImage(int width, int height) { drawImage(getImageData(fBase), 0, 0); drawImage(getImageData(JavaPluginImages.DESC_OVR_FOCUS), 0, 0); } private ImageData getImageData(ImageDescriptor descriptor) { ImageData data = descriptor.getImageData(); // see bug 51965: getImageData can return null if (data == null) { data = DEFAULT_IMAGE_DATA; C4JActivator.logErrorMessage("Image data not available: " + descriptor.toString()); //$NON-NLS-1$ } return data; } protected Point getSize() { return JavaElementImageProvider.BIG_SIZE; } public int hashCode() { return fBase.hashCode(); } public boolean equals(Object object) { return object != null && FocusDescriptor.class.equals(object.getClass()) && ((FocusDescriptor) object).fBase.equals(fBase); } } private Color fGrayedColor; private Color fSpecialColor; private ViewerFilter fFilter; private ContractHierarchyLifeCycle fHierarchy; public HierarchyLabelProvider(ContractHierarchyLifeCycle lifeCycle) { super(DEFAULT_TEXTFLAGS | JavaElementLabels.USE_RESOLVED, DEFAULT_IMAGEFLAGS); fHierarchy = lifeCycle; fFilter = null; } public ContractHierarchyLifeCycle getHierarchyLifeCycle() { return fHierarchy; } /** * @return Returns the filter. */ public ViewerFilter getFilter() { return fFilter; } /** * @param filter The filter to set. */ public void setFilter(ViewerFilter filter) { fFilter = filter; } protected boolean isDifferentScope(IType type) { if (fFilter != null && !fFilter.select(null, null, type)) { return true; } IJavaElement input = fHierarchy.getInputElement(); if (input == null || input.getElementType() == IJavaElement.TYPE) { return false; } IJavaElement parent = type.getAncestor(input.getElementType()); if (input.getElementType() == IJavaElement.PACKAGE_FRAGMENT) { if (parent == null || parent.getElementName().equals(input.getElementName())) { return false; } } else if (input.equals(parent)) { return false; } return true; } /* (non-Javadoc) * @see ILabelProvider#getText */ public String getText(Object element) { String text = super.getText(element); return decorateText(text, element); } /* (non-Javadoc) * @see ILabelProvider#getImage */ public Image getImage(Object element) { Image result = null; if (element instanceof IType) { ImageDescriptor desc = getTypeImageDescriptor((IType) element); if (desc != null) { if (element.equals(fHierarchy.getInputElement())) { desc = new FocusDescriptor(desc); } result = JavaPlugin.getImageDescriptorRegistry().get(desc); } } else { result = fImageLabelProvider.getImageLabel(element, evaluateImageFlags(element)); } return decorateImage(result, element); } private ImageDescriptor getTypeImageDescriptor(IType type) { IContractHierarchy hierarchy = fHierarchy.getContractHierarchy(); if (hierarchy == null) { return new JavaElementImageDescriptor(JavaPluginImages.DESC_OBJS_CLASS, 0, JavaElementImageProvider.BIG_SIZE); } int flags = hierarchy.getCachedFlags(type); if (flags == -1) { return new JavaElementImageDescriptor(JavaPluginImages.DESC_OBJS_CLASS, 0, JavaElementImageProvider.BIG_SIZE); } boolean isInterface = Flags.isInterface(flags); boolean isInner = (type.getDeclaringType() != null); ImageDescriptor desc = JavaElementImageProvider.getTypeImageDescriptor(isInner, false, flags, isDifferentScope(type)); int adornmentFlags = 0; if (Flags.isFinal(flags)) { adornmentFlags |= JavaElementImageDescriptor.FINAL; } if (Flags.isAbstract(flags) && !isInterface) { adornmentFlags |= JavaElementImageDescriptor.ABSTRACT; } if (Flags.isStatic(flags)) { adornmentFlags |= JavaElementImageDescriptor.STATIC; } return new JavaElementImageDescriptor(desc, adornmentFlags, JavaElementImageProvider.BIG_SIZE); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.IColorProvider#getForeground(java.lang.Object) */ public Color getForeground(Object element) { if (element instanceof IMethod) { if (fSpecialColor == null) { fSpecialColor = Display.getCurrent().getSystemColor(SWT.COLOR_DARK_BLUE); } return fSpecialColor; } else if (element instanceof IType && isDifferentScope((IType) element)) { if (fGrayedColor == null) { fGrayedColor = Display.getCurrent().getSystemColor(SWT.COLOR_DARK_GRAY); } return fGrayedColor; } return null; } }