| /******************************************************************************* |
| * 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; |
| |
| /** |
| * Try statement AST node type. |
| * |
| * <pre> |
| * TryStatement: |
| * <b>try</b> Block |
| * { CatchClause } |
| * [ <b>finally</b> Block ] |
| * </pre> |
| * |
| * @since 2.0 |
| */ |
| public class TryStatement extends Statement { |
| |
| /** |
| * The "body" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor BODY_PROPERTY = |
| new ChildPropertyDescriptor(TryStatement.class, "body", Block.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "catchClauses" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildListPropertyDescriptor CATCH_CLAUSES_PROPERTY = |
| new ChildListPropertyDescriptor(TryStatement.class, "catchClauses", CatchClause.class, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "finally" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor FINALLY_PROPERTY = |
| new ChildPropertyDescriptor(TryStatement.class, "finally", Block.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(4); |
| createPropertyList(TryStatement.class, propertyList); |
| addProperty(BODY_PROPERTY, propertyList); |
| addProperty(CATCH_CLAUSES_PROPERTY, propertyList); |
| addProperty(FINALLY_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 body; lazily initialized; defaults to an empty block. |
| */ |
| private Block body = null; |
| |
| /** |
| * The catch clauses (element type: <code>CatchClause</code>). |
| * Defaults to an empty list. |
| */ |
| private ASTNode.NodeList catchClauses = |
| new ASTNode.NodeList(CATCH_CLAUSES_PROPERTY); |
| |
| /** |
| * The finally block, or <code>null</code> if none. |
| * Defaults to none. |
| */ |
| private Block optionalFinallyBody = null; |
| |
| |
| /** |
| * Creates a new AST node for a try statement owned by the given |
| * AST. By default, the try statement has an empty block, no catch |
| * clauses, and no finally block. |
| * <p> |
| * N.B. This constructor is package-private. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| TryStatement(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 == BODY_PROPERTY) { |
| if (get) { |
| return getBody(); |
| } else { |
| setBody((Block) child); |
| return null; |
| } |
| } |
| if (property == FINALLY_PROPERTY) { |
| if (get) { |
| return getFinally(); |
| } else { |
| setFinally((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 List internalGetChildListProperty(ChildListPropertyDescriptor property) { |
| if (property == CATCH_CLAUSES_PROPERTY) { |
| return catchClauses(); |
| } |
| // allow default implementation to flag the error |
| return super.internalGetChildListProperty(property); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final int getNodeType0() { |
| return TRY_STATEMENT; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| TryStatement result = new TryStatement(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.copyLeadingComment(this); |
| result.setBody((Block) getBody().clone(target)); |
| result.catchClauses().addAll( |
| ASTNode.copySubtrees(target, catchClauses())); |
| result.setFinally( |
| (Block) ASTNode.copySubtree(target, getFinally())); |
| 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, getBody()); |
| acceptChildren(visitor, this.catchClauses); |
| acceptChild(visitor, getFinally()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the body of this try statement. |
| * |
| * @return the try 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 try statement. |
| * |
| * @param body the 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); |
| } |
| |
| /** |
| * Returns the live ordered list of catch clauses for this try statement. |
| * |
| * @return the live list of catch clauses |
| * (element type: <code>CatchClause</code>) |
| */ |
| public List catchClauses() { |
| return this.catchClauses; |
| } |
| |
| /** |
| * Returns the finally block of this try statement, or <code>null</code> if |
| * this try statement has <b>no</b> finally block. |
| * |
| * @return the finally block, or <code>null</code> if this try statement |
| * has none |
| */ |
| public Block getFinally() { |
| return this.optionalFinallyBody; |
| } |
| |
| /** |
| * Sets or clears the finally block of this try statement. |
| * |
| * @param block the finally block node, or <code>null</code> if |
| * there is none |
| * @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 setFinally(Block block) { |
| ASTNode oldChild = this.optionalFinallyBody; |
| preReplaceChild(oldChild, block, FINALLY_PROPERTY); |
| this.optionalFinallyBody = block; |
| postReplaceChild(oldChild, block, FINALLY_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| return super.memSize() + 3 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.body == null ? 0 : getBody().treeSize()) |
| + this.catchClauses.listSize() |
| + (this.optionalFinallyBody == null ? 0 : getFinally().treeSize()); |
| } |
| } |