| /******************************************************************************* |
| * Copyright (c) 2021, 2022 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.core.dom; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jdt.internal.core.dom.util.DOMASTUtil; |
| |
| /** |
| * GuardedPattern pattern AST node type. |
| * |
| * <pre> |
| * GuardedPattern: |
| * Pattern && Expression |
| * </pre> |
| * |
| * @since 3.27 |
| * @noinstantiate This class is not intended to be instantiated by clients. |
| * @noreference This class is not intended to be referenced by clients. |
| */ |
| |
| @SuppressWarnings("rawtypes") |
| public class GuardedPattern extends Pattern{ |
| |
| GuardedPattern(AST ast) { |
| super(ast); |
| supportedOnlyIn18(); |
| unsupportedWithoutPreviewError(); |
| } |
| |
| /** |
| * The "pattern" structural property of this node type (child type: {@link Pattern}). (added in JEP 406). |
| */ |
| public static final ChildPropertyDescriptor PATTERN_PROPERTY = internalPatternPropertyFactory(GuardedPattern.class); |
| |
| /** |
| * The "expression" structural property of this node type (child type: {@link Expression}). (added in JEP 406). |
| */ |
| public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(GuardedPattern.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$); |
| |
| |
| /** |
| * A list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}), |
| * or null if uninitialized. |
| */ |
| private static final List PROPERTY_DESCRIPTORS; |
| |
| static { |
| List propertyList = new ArrayList(3); |
| createPropertyList(GuardedPattern.class, propertyList); |
| addProperty(PATTERN_PROPERTY, propertyList); |
| addProperty(EXPRESSION_PROPERTY, propertyList); |
| PROPERTY_DESCRIPTORS = reapPropertyList(propertyList); |
| } |
| |
| /** |
| * The pattern; <code>null</code> for none |
| */ |
| private Pattern pattern = null; |
| |
| /** |
| * The expression; <code>null</code> for none; lazily initialized (but |
| * does <b>not</b> default to none). |
| */ |
| private Expression conditonalExpression = null; |
| |
| |
| |
| @Override |
| List internalStructuralPropertiesForType(int apiLevel) { |
| return propertyDescriptors(apiLevel); |
| } |
| |
| @Override |
| final List internalStructuralPropertiesForType(int apiLevel, boolean previewEnabled) { |
| return propertyDescriptors(apiLevel, previewEnabled); |
| } |
| @Override |
| final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { |
| if (property == EXPRESSION_PROPERTY) { |
| if (get) { |
| return getExpression(); |
| } else { |
| setExpression((Expression) child); |
| return null; |
| } |
| } else if (property == PATTERN_PROPERTY) { |
| if (get) { |
| return getPattern(); |
| } else { |
| setPattern((Pattern)child); |
| return null; |
| } |
| } |
| // allow default implementation to flag the error |
| return super.internalGetSetChildProperty(property, get, child); |
| } |
| |
| @Override |
| int getNodeType0() { |
| return GUARDED_PATTERN; |
| } |
| |
| @Override |
| boolean subtreeMatch0(ASTMatcher matcher, Object other) { |
| return matcher.match(this, other); |
| } |
| |
| @Override |
| ASTNode clone0(AST target) { |
| GuardedPattern result = new GuardedPattern(target); |
| result.setSourceRange(getStartPosition(), getLength()); |
| result.setPattern((Pattern) getPattern().clone(target)); |
| result.setExpression((Expression) getExpression().clone(target)); |
| return result; |
| } |
| |
| @Override |
| void accept0(ASTVisitor visitor) { |
| boolean visitChildren = visitor.visit(this); |
| if (visitChildren) { |
| // visit children in normal left to right reading order |
| acceptChild(visitor, getPattern()); |
| acceptChild(visitor, getExpression()); |
| } |
| visitor.endVisit(this); |
| |
| } |
| |
| @Override |
| int memSize() { |
| return BASE_NODE_SIZE + 2 * 4; |
| } |
| |
| @Override |
| int treeSize() { |
| return |
| memSize() |
| + (this.pattern == null ? 0 : getPattern().treeSize()) |
| + (this.conditonalExpression == null ? 0 : getExpression().treeSize()); |
| } |
| |
| @Override |
| public List<SingleVariableDeclaration> patternVariables() { |
| return null; |
| } |
| |
| /** |
| * Returns a list of structural property descriptors for this node type. |
| * Clients must not modify the result. |
| * |
| * @param apiLevel the API level; one of the |
| * <code>AST.JLS*</code> constants |
| |
| * @return a list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}) |
| */ |
| public static List propertyDescriptors(int apiLevel) { |
| return null; |
| } |
| |
| /** |
| * Returns a list of structural property descriptors for this node type. |
| * Clients must not modify the result. |
| * |
| * @param apiLevel the API level; one of the |
| * <code>AST.JLS*</code> constants |
| * @param previewEnabled the previewEnabled flag |
| * @return a list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}) |
| * @noreference This method is not intended to be referenced by clients. |
| */ |
| public static List propertyDescriptors(int apiLevel, boolean previewEnabled) { |
| if (DOMASTUtil.isPatternSupported(apiLevel, previewEnabled)) { |
| return PROPERTY_DESCRIPTORS; |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the conditional expression of this pattern, or |
| * <code>null</code> if there is none (the "default:" case). |
| * |
| * @return the expression node, or <code>null</code> if there is none |
| */ |
| public Expression getExpression() { |
| supportedOnlyIn18(); |
| unsupportedWithoutPreviewError(); |
| return this.conditonalExpression; |
| } |
| |
| /** |
| * Returns the pattern of this Guarded Pattern, or |
| * <code>empty</code> if there is none. |
| * @return the pattern node |
| * (element type: {@link Pattern}) |
| * @exception UnsupportedOperationException if this operation is used other than JLS18 |
| * @exception UnsupportedOperationException if this expression is used with previewEnabled flag as false |
| * @noreference This method is not intended to be referenced by clients as it is a part of Java preview feature. |
| */ |
| public Pattern getPattern() { |
| supportedOnlyIn18(); |
| unsupportedWithoutPreviewError(); |
| return this.pattern; |
| } |
| |
| /** |
| * Sets the conditional expression of this pattern, or clears it (turns it into |
| * the "default:" case). |
| * |
| * @param expression the expression node, or <code>null</code> to |
| * turn it into the "default:" case |
| * @exception IllegalArgumentException if: |
| * <ul> |
| * <li>the node belongs to a different AST</li> |
| * <li>the node already has a parent</li> |
| * <li>a cycle in would be created</li> |
| * </ul> |
| */ |
| public void setExpression(Expression expression) { |
| supportedOnlyIn18(); |
| unsupportedWithoutPreviewError(); |
| ASTNode oldChild = this.conditonalExpression; |
| preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| this.conditonalExpression = expression; |
| postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| } |
| |
| /** |
| * Sets the pattern of this switch case. |
| * @param pattern |
| * @noreference This method is not intended to be referenced by clients. |
| * @exception UnsupportedOperationException if this operation is used not for JLS18 |
| * @exception UnsupportedOperationException if this operation is used without previewEnabled |
| */ |
| public void setPattern(Pattern pattern) { |
| supportedOnlyIn18(); |
| unsupportedWithoutPreviewError(); |
| ASTNode oldChild = this.pattern; |
| preReplaceChild(oldChild, pattern, PATTERN_PROPERTY); |
| this.pattern = pattern; |
| postReplaceChild(oldChild, pattern, PATTERN_PROPERTY); |
| } |
| |
| } |