| /******************************************************************************* |
| * Copyright (c) 2007, 2016 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.corext.dom; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Hashtable; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.NullProgressMonitor; |
| import org.eclipse.core.runtime.SubProgressMonitor; |
| |
| import org.eclipse.jdt.core.ICompilationUnit; |
| import org.eclipse.jdt.core.IJavaProject; |
| import org.eclipse.jdt.core.dom.ASTParser; |
| import org.eclipse.jdt.core.dom.ASTRequestor; |
| import org.eclipse.jdt.core.dom.IBinding; |
| |
| /** |
| * Creates AST from a set of compilation units. Uses the |
| * batch parser. Splits the set of compilation units in subsets |
| * such that it is unlikely that a out of memory exception will occur. |
| * |
| * @since 3.4 |
| */ |
| public class ASTBatchParser { |
| |
| private static final int MAX_AT_ONCE; |
| static { |
| long maxMemory= Runtime.getRuntime().maxMemory() / (1 << 20); // in MiB |
| |
| if (maxMemory >= 2000) MAX_AT_ONCE= 400; |
| else if (maxMemory >= 1500) MAX_AT_ONCE= 300; |
| else if (maxMemory >= 1000) MAX_AT_ONCE= 200; |
| else if (maxMemory >= 500) MAX_AT_ONCE= 100; |
| else MAX_AT_ONCE= 25; |
| } |
| |
| /** |
| * Creates ASTs for each compilation unit in <code>units</code>. |
| * <p> |
| * <code>ASTRequestor.acceptAST</code> is called in no particular order to |
| * pass the compilation unit and the corresponding AST to <code>requestor</code>. |
| * </p> |
| * <p> |
| * The <code>bindingKeys</code> parameter specifies bindings keys |
| * ({@link IBinding#getKey()}) that are to be looked up. |
| * </p> |
| * |
| * @param compilationUnits the compilation units to create ASTs for |
| * @param bindingKeys the binding keys to create bindings for |
| * @param requestor the AST requestor that collects abstract syntax trees and bindings |
| * @param monitor the progress monitor used to report progress and request cancelation, |
| * or <code>null</code> if none |
| * @see ASTParser#createASTs(ICompilationUnit[], String[], ASTRequestor, IProgressMonitor) |
| */ |
| public final void createASTs(ICompilationUnit[] compilationUnits, String[] bindingKeys, ASTRequestor requestor, IProgressMonitor monitor) { |
| if (compilationUnits.length == 0) |
| return; |
| |
| if (monitor == null) |
| monitor= new NullProgressMonitor(); |
| |
| monitor.beginTask("", compilationUnits.length); //$NON-NLS-1$ |
| try { |
| |
| for (ICompilationUnit[] units : splitByProject(compilationUnits)) { |
| if (units.length <= MAX_AT_ONCE) { |
| createParser(units[0].getJavaProject()).createASTs(units, bindingKeys, requestor, new SubProgressMonitor(monitor, units.length)); |
| } else { |
| List<ICompilationUnit> list= Arrays.asList(units); |
| int end= 0; |
| int cursor= 0; |
| while (cursor < units.length) { |
| end= Math.min(end + MAX_AT_ONCE, units.length); |
| List<ICompilationUnit> toParse= list.subList(cursor, end); |
| |
| createParser(units[0].getJavaProject()).createASTs(toParse.toArray(new ICompilationUnit[toParse.size()]), bindingKeys, requestor, |
| new SubProgressMonitor(monitor, toParse.size())); |
| cursor= end; |
| } |
| } |
| } |
| } finally { |
| monitor.done(); |
| } |
| } |
| |
| /** |
| * Creates a new parser which can be used to create ASTs |
| * for compilation units in <code>project</code> |
| * <p> |
| * Subclasses may override |
| * </p> |
| * |
| * @param project the project for which ASTs are been generated |
| * @return an AST parser capable of creating ASTs of compilation units in project |
| */ |
| protected ASTParser createParser(IJavaProject project) { |
| ASTParser result= ASTParser.newParser(IASTSharedValues.SHARED_AST_LEVEL); |
| result.setResolveBindings(true); |
| result.setProject(project); |
| |
| return result; |
| } |
| |
| private static ICompilationUnit[][] splitByProject(ICompilationUnit[] units) { |
| if (hasOnlyOneProject(units)) |
| return new ICompilationUnit[][] { units }; |
| |
| Hashtable<IJavaProject, ArrayList<ICompilationUnit>> projectTable= new Hashtable<>(); |
| |
| for (ICompilationUnit unit : units) { |
| ArrayList<ICompilationUnit> list= projectTable.get(unit.getJavaProject()); |
| if (list == null) { |
| list= new ArrayList<>(); |
| projectTable.put(unit.getJavaProject(), list); |
| } |
| list.add(unit); |
| } |
| |
| Collection<ArrayList<ICompilationUnit>> values= projectTable.values(); |
| |
| ICompilationUnit[][] result= new ICompilationUnit[values.size()][]; |
| int i= 0; |
| for (ArrayList<ICompilationUnit> cus : values) { |
| result[i]= cus.toArray(new ICompilationUnit[cus.size()]); |
| i++; |
| } |
| |
| return result; |
| } |
| |
| private static boolean hasOnlyOneProject(ICompilationUnit[] units) { |
| IJavaProject javaProject= units[0].getJavaProject(); |
| for (int i= 1; i < units.length; i++) { |
| if (!javaProject.equals(units[i].getJavaProject())) |
| return false; |
| } |
| |
| return true; |
| } |
| } |