| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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; |
| |
| /** |
| * For statement AST node type. |
| * |
| * <pre> |
| * ForStatement: |
| * <b>for</b> <b>(</b> |
| * [ ForInit ]<b>;</b> |
| * [ Expression ] <b>;</b> |
| * [ ForUpdate ] <b>)</b> |
| * Statement |
| * ForInit: |
| * Expression { <b>,</b> Expression } |
| * ForUpdate: |
| * Expression { <b>,</b> Expression } |
| * </pre> |
| * <p> |
| * Note: When variables are declared in the initializer |
| * of a for statement such as "<code>for (int a=1, b=2;;);</code>", |
| * they should be represented as a single |
| * <code>VariableDeclarationExpression</code> |
| * with two fragments, rather than being split up into a pair |
| * of expressions. |
| * </p> |
| * |
| * @since 2.0 |
| * @noinstantiate This class is not intended to be instantiated by clients. |
| */ |
| public class ForStatement extends Statement { |
| |
| /** |
| * The "initializers" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildListPropertyDescriptor INITIALIZERS_PROPERTY = |
| new ChildListPropertyDescriptor(ForStatement.class, "initializers", Expression.class, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "expression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(ForStatement.class, "expression", Expression.class, OPTIONAL, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "updaters" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildListPropertyDescriptor UPDATERS_PROPERTY = |
| new ChildListPropertyDescriptor(ForStatement.class, "updaters", Expression.class, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "body" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor BODY_PROPERTY = |
| new ChildPropertyDescriptor(ForStatement.class, "body", Statement.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 properyList = new ArrayList(5); |
| createPropertyList(ForStatement.class, properyList); |
| addProperty(INITIALIZERS_PROPERTY, properyList); |
| addProperty(EXPRESSION_PROPERTY, properyList); |
| addProperty(UPDATERS_PROPERTY, properyList); |
| addProperty(BODY_PROPERTY, properyList); |
| PROPERTY_DESCRIPTORS = reapPropertyList(properyList); |
| } |
| |
| /** |
| * 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 list of initializer expressions (element type: |
| * <code>Expression</code>). Defaults to an empty list. |
| */ |
| private ASTNode.NodeList initializers = |
| new ASTNode.NodeList(INITIALIZERS_PROPERTY); |
| |
| /** |
| * The condition expression; <code>null</code> for none; defaults to none. |
| */ |
| private Expression optionalConditionExpression = null; |
| |
| /** |
| * The list of update expressions (element type: |
| * <code>Expression</code>). Defaults to an empty list. |
| */ |
| private ASTNode.NodeList updaters = |
| new ASTNode.NodeList(UPDATERS_PROPERTY); |
| |
| /** |
| * The body statement; lazily initialized; defaults to an empty block |
| * statement. |
| */ |
| private Statement body = null; |
| |
| /** |
| * Creates a new AST node for a for statement owned by the given AST. |
| * By default, there are no initializers, no condition expression, |
| * no updaters, and the body is an empty block. |
| * |
| * @param ast the AST that is to own this node |
| */ |
| ForStatement(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; |
| } |
| } |
| if (property == BODY_PROPERTY) { |
| if (get) { |
| return getBody(); |
| } else { |
| setBody((Statement) 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 == INITIALIZERS_PROPERTY) { |
| return initializers(); |
| } |
| if (property == UPDATERS_PROPERTY) { |
| return updaters(); |
| } |
| // allow default implementation to flag the error |
| return super.internalGetChildListProperty(property); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| final int getNodeType0() { |
| return FOR_STATEMENT; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| ForStatement result = new ForStatement(target); |
| result.setSourceRange(getStartPosition(), getLength()); |
| result.copyLeadingComment(this); |
| result.initializers().addAll(ASTNode.copySubtrees(target, initializers())); |
| result.setExpression( |
| (Expression) ASTNode.copySubtree(target, getExpression())); |
| result.updaters().addAll(ASTNode.copySubtrees(target, updaters())); |
| result.setBody( |
| (Statement) ASTNode.copySubtree(target, getBody())); |
| 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 |
| acceptChildren(visitor, this.initializers); |
| acceptChild(visitor, getExpression()); |
| acceptChildren(visitor, this.updaters); |
| acceptChild(visitor, getBody()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the live ordered list of initializer expressions in this for |
| * statement. |
| * <p> |
| * The list should consist of either a list of so called statement |
| * expressions (JLS2, 14.8), or a single <code>VariableDeclarationExpression</code>. |
| * Otherwise, the for statement would have no Java source equivalent. |
| * </p> |
| * |
| * @return the live list of initializer expressions |
| * (element type: <code>Expression</code>) |
| */ |
| public List initializers() { |
| return this.initializers; |
| } |
| |
| /** |
| * Returns the condition expression of this for statement, or |
| * <code>null</code> if there is none. |
| * |
| * @return the condition expression node, or <code>null</code> if |
| * there is none |
| */ |
| public Expression getExpression() { |
| return this.optionalConditionExpression; |
| } |
| |
| /** |
| * Sets or clears the condition expression of this return statement. |
| * |
| * @param expression the condition expression 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 setExpression(Expression expression) { |
| ASTNode oldChild = this.optionalConditionExpression; |
| preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| this.optionalConditionExpression = expression; |
| postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| } |
| |
| /** |
| * Returns the live ordered list of update expressions in this for |
| * statement. |
| * <p> |
| * The list should consist of so called statement expressions. Otherwise, |
| * the for statement would have no Java source equivalent. |
| * </p> |
| * |
| * @return the live list of update expressions |
| * (element type: <code>Expression</code>) |
| */ |
| public List updaters() { |
| return this.updaters; |
| } |
| |
| /** |
| * Returns the body of this for statement. |
| * |
| * @return the body statement node |
| */ |
| public Statement 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 for statement. |
| * <p> |
| * Special note: The Java language does not allow a local variable declaration |
| * to appear as the body of a for statement (they may only appear within a |
| * block). However, the AST will allow a <code>VariableDeclarationStatement</code> |
| * as the body of a <code>ForStatement</code>. To get something that will |
| * compile, be sure to embed the <code>VariableDeclarationStatement</code> |
| * inside a <code>Block</code>. |
| * </p> |
| * |
| * @param statement the body statement 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(Statement statement) { |
| if (statement == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.body; |
| preReplaceChild(oldChild, statement, BODY_PROPERTY); |
| this.body = statement; |
| postReplaceChild(oldChild, statement, BODY_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| return super.memSize() + 4 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + this.initializers.listSize() |
| + this.updaters.listSize() |
| + (this.optionalConditionExpression == null ? 0 : getExpression().treeSize()) |
| + (this.body == null ? 0 : getBody().treeSize()); |
| } |
| } |