| /******************************************************************************* |
| * Copyright (c) 2000, 2019 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation |
| * (report 36180: Callers/Callees view) |
| * Red Hat Inc. - refactored to jdt.core.manipulation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.corext.callhierarchy; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.SubProgressMonitor; |
| |
| import org.eclipse.jdt.core.IJavaElement; |
| import org.eclipse.jdt.core.IMember; |
| import org.eclipse.jdt.core.IMethod; |
| import org.eclipse.jdt.core.IType; |
| import org.eclipse.jdt.core.JavaModelException; |
| |
| import org.eclipse.jdt.internal.core.manipulation.JavaManipulationPlugin; |
| |
| /** |
| * The main plugin class to be used in the desktop. |
| */ |
| public class Implementors { |
| private static IImplementorFinder[] IMPLEMENTOR_FINDERS= new IImplementorFinder[] { new JavaImplementorFinder() }; |
| private static Implementors fgInstance; |
| |
| /** |
| * Returns the shared instance. |
| */ |
| public static Implementors getInstance() { |
| if (fgInstance == null) { |
| fgInstance = new Implementors(); |
| } |
| |
| return fgInstance; |
| } |
| |
| /** |
| * Searches for implementors of the specified Java elements. Currently, only IMethod |
| * instances are searched for. Also, only the first element of the elements |
| * parameter is taken into consideration. |
| * |
| * @param elements |
| * |
| * @return An array of found implementing Java elements (currently only IMethod |
| * instances) |
| */ |
| public IJavaElement[] searchForImplementors(IJavaElement[] elements, |
| IProgressMonitor progressMonitor) { |
| if ((elements != null) && (elements.length > 0)) { |
| IJavaElement element = elements[0]; |
| |
| try { |
| if (element instanceof IMember) { |
| IMember member = (IMember) element; |
| IType type = member.getDeclaringType(); |
| |
| if (type.isInterface()) { |
| IType[] implementingTypes = findImplementingTypes(type, |
| progressMonitor); |
| |
| if (member.getElementType() == IJavaElement.METHOD) { |
| return findMethods((IMethod)member, implementingTypes, progressMonitor); |
| } else { |
| return implementingTypes; |
| } |
| } |
| } |
| } catch (JavaModelException e) { |
| JavaManipulationPlugin.log(e); |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Searches for interfaces which are implemented by the declaring classes of the |
| * specified Java elements. Currently, only IMethod instances are searched for. |
| * Also, only the first element of the elements parameter is taken into |
| * consideration. |
| * |
| * @param elements |
| * |
| * @return An array of found interfaces implemented by the declaring classes of the |
| * specified Java elements (currently only IMethod instances) |
| */ |
| public IJavaElement[] searchForInterfaces(IJavaElement[] elements, |
| IProgressMonitor progressMonitor) { |
| if ((elements != null) && (elements.length > 0)) { |
| IJavaElement element = elements[0]; |
| |
| if (element instanceof IMember) { |
| IMember member = (IMember) element; |
| IType type = member.getDeclaringType(); |
| |
| IType[] implementingTypes = findInterfaces(type, progressMonitor); |
| |
| if (!progressMonitor.isCanceled()) { |
| if (member.getElementType() == IJavaElement.METHOD) { |
| return findMethods((IMethod)member, implementingTypes, progressMonitor); |
| } else { |
| return implementingTypes; |
| } |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| private IImplementorFinder[] getImplementorFinders() { |
| return IMPLEMENTOR_FINDERS; |
| } |
| |
| private IType[] findImplementingTypes(IType type, IProgressMonitor progressMonitor) { |
| Collection<IType> implementingTypes = new ArrayList<>(); |
| |
| IImplementorFinder[] finders = getImplementorFinders(); |
| |
| for (int i = 0; (i < finders.length) && !progressMonitor.isCanceled(); i++) { |
| Collection<IType> types = finders[i].findImplementingTypes(type, |
| new SubProgressMonitor(progressMonitor, 10, |
| SubProgressMonitor.SUPPRESS_SUBTASK_LABEL)); |
| |
| if (types != null) { |
| implementingTypes.addAll(types); |
| } |
| } |
| |
| return implementingTypes.toArray(new IType[implementingTypes.size()]); |
| } |
| |
| private IType[] findInterfaces(IType type, IProgressMonitor progressMonitor) { |
| Collection<IType> interfaces = new ArrayList<>(); |
| |
| IImplementorFinder[] finders = getImplementorFinders(); |
| |
| for (int i = 0; (i < finders.length) && !progressMonitor.isCanceled(); i++) { |
| Collection<IType> types = finders[i].findInterfaces(type, |
| new SubProgressMonitor(progressMonitor, 10, |
| SubProgressMonitor.SUPPRESS_SUBTASK_LABEL)); |
| |
| if (types != null) { |
| interfaces.addAll(types); |
| } |
| } |
| |
| return interfaces.toArray(new IType[interfaces.size()]); |
| } |
| |
| /** |
| * Finds IMethod instances on the specified IType instances with identical signatures |
| * as the specified IMethod parameter. |
| * |
| * @param method The method to find "equals" of. |
| * @param types The types in which the search is performed. |
| * |
| * @return An array of methods which match the method parameter. |
| */ |
| private IJavaElement[] findMethods(IMethod method, IType[] types, |
| IProgressMonitor progressMonitor) { |
| Collection<IMethod> foundMethods = new ArrayList<>(); |
| |
| SubProgressMonitor subProgressMonitor = new SubProgressMonitor(progressMonitor, |
| 10, SubProgressMonitor.SUPPRESS_SUBTASK_LABEL); |
| subProgressMonitor.beginTask("", types.length); //$NON-NLS-1$ |
| |
| try { |
| for (int i = 0; i < types.length; i++) { |
| IType type = types[i]; |
| IMethod[] methods = type.findMethods(method); |
| |
| if (methods != null) { |
| foundMethods.addAll(Arrays.asList(methods)); |
| } |
| |
| subProgressMonitor.worked(1); |
| } |
| } finally { |
| subProgressMonitor.done(); |
| } |
| |
| return foundMethods.toArray(new IJavaElement[foundMethods.size()]); |
| } |
| } |