| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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 org.eclipse.jdt.core.dom; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Switch case AST node type. A switch case is a special kind of node used only |
| * in switch statements. It is a <code>Statement</code> in name only. |
| * <p> |
| * <pre> |
| * SwitchCase: |
| * <b>case</b> Expression <b>:</b> |
| * <b>default</b> <b>:</b> |
| * </pre> |
| * </p> |
| * |
| * @since 2.0 |
| */ |
| public class SwitchCase extends Statement { |
| |
| /** |
| * The "expression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(SwitchCase.class, "expression", Expression.class, OPTIONAL, 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(2); |
| createPropertyList(SwitchCase.class, propertyList); |
| addProperty(EXPRESSION_PROPERTY, propertyList); |
| PROPERTY_DESCRIPTORS = reapPropertyList(propertyList); |
| } |
| |
| /** |
| * 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}) |
| * @since 3.0 |
| */ |
| public static List propertyDescriptors(int apiLevel) { |
| return PROPERTY_DESCRIPTORS; |
| } |
| |
| /** |
| * The expression; <code>null</code> for none; lazily initialized (but |
| * does <b>not</b> default to none). |
| * @see #expressionInitialized |
| */ |
| private Expression optionalExpression = null; |
| |
| /** |
| * Indicates whether <code>optionalExpression</code> has been initialized. |
| */ |
| private boolean expressionInitialized = false; |
| |
| /** |
| * Creates a new AST node for a switch case pseudo-statement owned by the |
| * given AST. By default, there is an unspecified, but legal, expression. |
| * |
| * @param ast the AST that is to own this node |
| */ |
| SwitchCase(AST ast) { |
| super(ast); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final List internalStructuralPropertiesForType(int apiLevel) { |
| return propertyDescriptors(apiLevel); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { |
| if (property == EXPRESSION_PROPERTY) { |
| if (get) { |
| return getExpression(); |
| } else { |
| setExpression((Expression) child); |
| return null; |
| } |
| } |
| // allow default implementation to flag the error |
| return super.internalGetSetChildProperty(property, get, child); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final int getNodeType0() { |
| return SWITCH_CASE; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| SwitchCase result = new SwitchCase(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.copyLeadingComment(this); |
| result.setExpression( |
| (Expression) ASTNode.copySubtree(target, getExpression())); |
| return result; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final boolean subtreeMatch0(ASTMatcher matcher, Object other) { |
| // dispatch to correct overloaded match method |
| return matcher.match(this, other); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| void accept0(ASTVisitor visitor) { |
| boolean visitChildren = visitor.visit(this); |
| if (visitChildren) { |
| acceptChild(visitor, getExpression()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the expression of this switch case, 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() { |
| if (!this.expressionInitialized) { |
| // lazy init must be thread-safe for readers |
| synchronized (this) { |
| if (!this.expressionInitialized) { |
| preLazyInit(); |
| this.optionalExpression = new SimpleName(this.ast); |
| this.expressionInitialized = true; |
| postLazyInit(this.optionalExpression, EXPRESSION_PROPERTY); |
| } |
| } |
| } |
| return this.optionalExpression; |
| } |
| |
| /** |
| * Sets the expression of this switch case, 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) { |
| ASTNode oldChild = this.optionalExpression; |
| preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| this.optionalExpression = expression; |
| this.expressionInitialized = true; |
| postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| } |
| |
| /** |
| * Returns whether this switch case represents the "default:" case. |
| * <p> |
| * This convenience method is equivalent to |
| * <code>getExpression() == null</code>. |
| * </p> |
| * |
| * @return <code>true</code> if this is the default switch case, and |
| * <code>false</code> if this is a non-default switch case |
| */ |
| public boolean isDefault() { |
| return getExpression() == null; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| return super.memSize() + 2 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.optionalExpression == null ? 0 : optionalExpression.treeSize()); |
| } |
| } |