| /******************************************************************************* |
| * 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; |
| |
| /** |
| * Throw statement AST node type. |
| * |
| * <pre> |
| * ThrowStatement: |
| * <b>throw</b> Expression <b>;</b> |
| * </pre> |
| * |
| * @since 2.0 |
| */ |
| public class ThrowStatement extends Statement { |
| |
| /** |
| * The "expression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(ThrowStatement.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(2); |
| createPropertyList(ThrowStatement.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; lazily initialized; defaults to a unspecified, but legal, |
| * expression. |
| */ |
| private Expression expression = null; |
| |
| /** |
| * Creates a new unparented throw statement node owned by the given |
| * AST. By default, the throw statement has an unspecified, but legal, |
| * expression. |
| * <p> |
| * N.B. This constructor is package-private. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| ThrowStatement(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 THROW_STATEMENT; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| ThrowStatement result = new ThrowStatement(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.copyLeadingComment(this); |
| result.setExpression((Expression) getExpression().clone(target)); |
| 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 throw statement. |
| * |
| * @return the expression node |
| */ |
| public Expression getExpression() { |
| if (this.expression == null) { |
| // lazy init must be thread-safe for readers |
| synchronized (this) { |
| if (this.expression == null) { |
| preLazyInit(); |
| this.expression = new SimpleName(this.ast); |
| postLazyInit(this.expression, EXPRESSION_PROPERTY); |
| } |
| } |
| } |
| return this.expression; |
| } |
| |
| /** |
| * Sets the expression of this throw statement. |
| * |
| * @param expression the new expression node |
| * @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) { |
| if (expression == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.expression; |
| preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| this.expression = expression; |
| postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| return super.memSize() + 1 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.expression == null ? 0 : getExpression().treeSize()); |
| } |
| } |