| /******************************************************************************* |
| * Copyright (c) 2019 Fabrice TIERCELIN 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: |
| * Fabrice TIERCELIN - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.fix; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.eclipse.core.runtime.CoreException; |
| |
| import org.eclipse.text.edits.TextEditGroup; |
| |
| import org.eclipse.jdt.core.ICompilationUnit; |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.ASTVisitor; |
| import org.eclipse.jdt.core.dom.CompilationUnit; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jdt.core.dom.MethodInvocation; |
| import org.eclipse.jdt.core.dom.ThisExpression; |
| import org.eclipse.jdt.core.dom.rewrite.ASTRewrite; |
| |
| import org.eclipse.jdt.internal.corext.dom.ASTNodes; |
| import org.eclipse.jdt.internal.corext.fix.CleanUpConstants; |
| import org.eclipse.jdt.internal.corext.fix.CompilationUnitRewriteOperationsFix; |
| import org.eclipse.jdt.internal.corext.fix.CompilationUnitRewriteOperationsFix.CompilationUnitRewriteOperation; |
| import org.eclipse.jdt.internal.corext.fix.LinkedProposalModel; |
| import org.eclipse.jdt.internal.corext.refactoring.structure.CompilationUnitRewrite; |
| |
| import org.eclipse.jdt.ui.cleanup.CleanUpRequirements; |
| import org.eclipse.jdt.ui.cleanup.ICleanUpFix; |
| import org.eclipse.jdt.ui.text.java.IProblemLocation; |
| |
| /** |
| * A fix that uses Map method instead of using the keyset or values: |
| * <ul> |
| * <li>Use containsKey() or containsValue() rather than contains(),</li> |
| * <li>Uses remove(), clear(), size() and isEmpty() on map directly.</li> |
| * </ul> |
| */ |
| public class MapMethodCleanUp extends AbstractMultiFix { |
| public MapMethodCleanUp() { |
| this(Collections.emptyMap()); |
| } |
| |
| public MapMethodCleanUp(Map<String, String> options) { |
| super(options); |
| } |
| |
| @Override |
| public CleanUpRequirements getRequirements() { |
| boolean requireAST= isEnabled(CleanUpConstants.USE_DIRECTLY_MAP_METHOD); |
| Map<String, String> requiredOptions= null; |
| return new CleanUpRequirements(requireAST, false, false, requiredOptions); |
| } |
| |
| @Override |
| public String[] getStepDescriptions() { |
| if (isEnabled(CleanUpConstants.USE_DIRECTLY_MAP_METHOD)) { |
| return new String[] { MultiFixMessages.UseDirectlyMapMethodCleanup_description }; |
| } |
| return new String[0]; |
| } |
| |
| @Override |
| public String getPreview() { |
| StringBuilder bld= new StringBuilder(); |
| if (isEnabled(CleanUpConstants.USE_DIRECTLY_MAP_METHOD)) { |
| bld.append("int x = map.size();\n"); //$NON-NLS-1$ |
| bld.append("if (map.containsKey(\"hello\")) {\n"); //$NON-NLS-1$ |
| bld.append(" map.remove(\"hello\");\n"); //$NON-NLS-1$ |
| bld.append("}\n"); //$NON-NLS-1$ |
| bld.append("map.clear();\n"); //$NON-NLS-1$ |
| bld.append("map.clear();\n"); //$NON-NLS-1$ |
| bld.append("if (map.isEmpty()) {\n"); //$NON-NLS-1$ |
| } else { |
| bld.append("int x = map.keySet().size();\n"); //$NON-NLS-1$ |
| bld.append("if (map.keySet().contains(\"hello\")) {\n"); //$NON-NLS-1$ |
| bld.append(" map.keySet().remove(\"hello\");\n"); //$NON-NLS-1$ |
| bld.append("}\n"); //$NON-NLS-1$ |
| bld.append("map.keySet().clear();\n"); //$NON-NLS-1$ |
| bld.append("map.values().clear();\n"); //$NON-NLS-1$ |
| bld.append("if (map.keySet().isEmpty()) {\n"); //$NON-NLS-1$ |
| } |
| bld.append(" x++;\n"); //$NON-NLS-1$ |
| bld.append("}\n"); //$NON-NLS-1$ |
| |
| return bld.toString(); |
| } |
| |
| @Override |
| protected ICleanUpFix createFix(CompilationUnit unit) throws CoreException { |
| if (!isEnabled(CleanUpConstants.USE_DIRECTLY_MAP_METHOD)) { |
| return null; |
| } |
| |
| final List<CompilationUnitRewriteOperation> rewriteOperations= new ArrayList<>(); |
| |
| unit.accept(new ASTVisitor() { |
| @Override |
| public boolean visit(MethodInvocation mi) { |
| MethodInvocation miExpression= ASTNodes.as(mi.getExpression(), MethodInvocation.class); |
| |
| if (miExpression != null && miExpression.getExpression() != null && ASTNodes.as(miExpression.getExpression(), ThisExpression.class) == null) { |
| String subAggregateClass; |
| |
| if (ASTNodes.usesGivenSignature(miExpression, Map.class.getCanonicalName(), "keySet")) { //$NON-NLS-1$ |
| subAggregateClass= Set.class.getCanonicalName(); |
| |
| if (ASTNodes.usesGivenSignature(mi, subAggregateClass, "remove", Object.class.getCanonicalName()) //$NON-NLS-1$ |
| // If parent is not an expression statement, the MethodInvocation must return a |
| // boolean. |
| // In that case, we cannot replace because `Map.removeKey(key) != null` |
| // is not strictly equivalent to `Map.keySet().remove(key)` |
| && mi.getParent().getNodeType() == ASTNode.EXPRESSION_STATEMENT) { |
| rewriteOperations.add(new MapMethodOperation(miExpression, mi, "remove")); //$NON-NLS-1$ |
| return false; |
| } |
| } else if (ASTNodes.usesGivenSignature(miExpression, Map.class.getCanonicalName(), "values")) { //$NON-NLS-1$ |
| subAggregateClass= Collection.class.getCanonicalName(); |
| } else { |
| return true; |
| } |
| |
| if (ASTNodes.usesGivenSignature(mi, subAggregateClass, "clear")) { //$NON-NLS-1$ |
| rewriteOperations.add(new MapMethodOperation(miExpression, mi, "clear")); //$NON-NLS-1$ |
| return false; |
| } |
| |
| if (ASTNodes.usesGivenSignature(mi, subAggregateClass, "size")) { //$NON-NLS-1$ |
| rewriteOperations.add(new MapMethodOperation(miExpression, mi, "size")); //$NON-NLS-1$ |
| return false; |
| } |
| |
| if (ASTNodes.usesGivenSignature(mi, subAggregateClass, "isEmpty")) { //$NON-NLS-1$ |
| rewriteOperations.add(new MapMethodOperation(miExpression, mi, "isEmpty")); //$NON-NLS-1$ |
| return false; |
| } |
| |
| if (ASTNodes.usesGivenSignature(mi, subAggregateClass, "contains", Object.class.getCanonicalName())) { //$NON-NLS-1$ |
| String methodName= ASTNodes.usesGivenSignature(miExpression, Map.class.getCanonicalName(), "keySet") ? "containsKey" : "containsValue"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ |
| rewriteOperations.add(new MapMethodOperation(miExpression, mi, methodName)); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| }); |
| |
| if (rewriteOperations.isEmpty()) { |
| return null; |
| } |
| |
| return new CompilationUnitRewriteOperationsFix(MultiFixMessages.UseDirectlyMapMethodCleanup_description, unit, |
| rewriteOperations.toArray(new CompilationUnitRewriteOperation[rewriteOperations.size()])); |
| } |
| |
| @Override |
| public boolean canFix(ICompilationUnit compilationUnit, IProblemLocation problem) { |
| return false; |
| } |
| |
| @Override |
| protected ICleanUpFix createFix(CompilationUnit unit, IProblemLocation[] problems) throws CoreException { |
| return null; |
| } |
| |
| private static class MapMethodOperation extends CompilationUnitRewriteOperation { |
| private final MethodInvocation subAggregateMi; |
| private final MethodInvocation globalMi; |
| private final String methodName; |
| |
| public MapMethodOperation(MethodInvocation mapKeySetMi, MethodInvocation actualMi, |
| String methodName) { |
| this.subAggregateMi= mapKeySetMi; |
| this.globalMi= actualMi; |
| this.methodName= methodName; |
| } |
| |
| @Override |
| public void rewriteAST(CompilationUnitRewrite cuRewrite, LinkedProposalModel linkedModel) throws CoreException { |
| ASTRewrite rewrite= cuRewrite.getASTRewrite(); |
| AST ast= cuRewrite.getRoot().getAST(); |
| TextEditGroup group= createTextEditGroup(MultiFixMessages.UseDirectlyMapMethodCleanup_description, cuRewrite); |
| |
| MethodInvocation newMethodInvocation= ast.newMethodInvocation(); |
| newMethodInvocation.setName(ast.newSimpleName(methodName)); |
| |
| if (subAggregateMi.getExpression() != null) { |
| newMethodInvocation.setExpression((Expression) rewrite.createMoveTarget(subAggregateMi.getExpression())); |
| } |
| |
| for (Object expression : globalMi.arguments()) { |
| newMethodInvocation.arguments().add(rewrite.createMoveTarget((Expression) expression)); |
| } |
| |
| rewrite.replace(this.globalMi, newMethodInvocation, group); |
| } |
| } |
| } |