| /******************************************************************************* |
| * 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 Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.core.dom; |
| |
| import java.util.List; |
| |
| /** |
| * Catch clause AST node type. |
| * |
| * <pre> |
| * CatchClause: |
| * <b>catch</b> <b>(</b> FormalParameter <b>)</b> Block |
| * </pre> |
| * |
| * @since 2.0 |
| */ |
| public class CatchClause extends ASTNode { |
| |
| /** |
| * The "exception" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor EXCEPTION_PROPERTY = |
| new ChildPropertyDescriptor(CatchClause.class, "exception", SingleVariableDeclaration.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "body" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor BODY_PROPERTY = |
| new ChildPropertyDescriptor(CatchClause.class, "body", Block.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 { |
| createPropertyList(CatchClause.class); |
| addProperty(EXCEPTION_PROPERTY); |
| addProperty(BODY_PROPERTY); |
| PROPERTY_DESCRIPTORS = reapPropertyList(); |
| } |
| |
| /** |
| * 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.LEVEL_*</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 body; lazily initialized; defaults to an empty block. |
| */ |
| private Block body = null; |
| |
| /** |
| * The exception variable declaration; lazily initialized; defaults to a |
| * unspecified, but legal, variable declaration. |
| */ |
| private SingleVariableDeclaration exceptionDecl = null; |
| |
| /** |
| * Creates a new AST node for a catch clause owned by the given |
| * AST. By default, the catch clause declares an unspecified, but legal, |
| * exception declaration and has an empty block. |
| * <p> |
| * N.B. This constructor is package-private. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| CatchClause(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 == EXCEPTION_PROPERTY) { |
| if (get) { |
| return getException(); |
| } else { |
| setException((SingleVariableDeclaration) child); |
| return null; |
| } |
| } |
| if (property == BODY_PROPERTY) { |
| if (get) { |
| return getBody(); |
| } else { |
| setBody((Block) 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 CATCH_CLAUSE; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| CatchClause result = new CatchClause(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.setBody((Block) getBody().clone(target)); |
| result.setException( |
| (SingleVariableDeclaration) ASTNode.copySubtree(target, getException())); |
| 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) { |
| // visit children in normal left to right reading order |
| acceptChild(visitor, getException()); |
| acceptChild(visitor, getBody()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the exception variable declaration of this catch clause. |
| * |
| * @return the exception variable declaration node |
| */ |
| public SingleVariableDeclaration getException() { |
| if (this.exceptionDecl == null) { |
| // lazy init must be thread-safe for readers |
| synchronized (this) { |
| if (this.exceptionDecl == null) { |
| preLazyInit(); |
| this.exceptionDecl = new SingleVariableDeclaration(this.ast); |
| postLazyInit(this.exceptionDecl, EXCEPTION_PROPERTY); |
| } |
| } |
| } |
| return this.exceptionDecl; |
| } |
| |
| /** |
| * Sets the variable declaration of this catch clause. |
| * |
| * @param exception the exception variable declaration 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 setException(SingleVariableDeclaration exception) { |
| if (exception == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.exceptionDecl; |
| preReplaceChild(oldChild, exception, EXCEPTION_PROPERTY); |
| this.exceptionDecl= exception; |
| postReplaceChild(oldChild, exception, EXCEPTION_PROPERTY); |
| } |
| |
| /** |
| * Returns the body of this catch clause. |
| * |
| * @return the catch clause body |
| */ |
| public Block getBody() { |
| if (this.body == null) { |
| // lazy init must be thread-safe for readers |
| synchronized (this) { |
| if (this.body == null) { |
| preLazyInit(); |
| this.body = new Block(this.ast); |
| postLazyInit(this.body, BODY_PROPERTY); |
| } |
| } |
| } |
| return this.body; |
| } |
| |
| /** |
| * Sets the body of this catch clause. |
| * |
| * @param body the catch clause block 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 setBody(Block body) { |
| if (body == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.body; |
| preReplaceChild(oldChild, body, BODY_PROPERTY); |
| this.body = body; |
| postReplaceChild(oldChild, body, BODY_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| // treat Code as free |
| return BASE_NODE_SIZE + 2 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.exceptionDecl == null ? 0 : getException().treeSize()) |
| + (this.body == null ? 0 : getBody().treeSize()); |
| } |
| } |