| /******************************************************************************* |
| * 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; |
| |
| /** |
| * Simple or qualified "this" AST node type. |
| * |
| * <pre> |
| * ThisExpression: |
| * [ ClassName <b>.</b> ] <b>this</b> |
| * </pre> |
| * <p> |
| * See <code>FieldAccess</code> for guidelines on handling other expressions |
| * that resemble qualified names. |
| * </p> |
| * |
| * @see FieldAccess |
| * @since 2.0 |
| * @noinstantiate This class is not intended to be instantiated by clients. |
| */ |
| public class ThisExpression extends Expression { |
| |
| /** |
| * The "qualifier" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor QUALIFIER_PROPERTY = |
| new ChildPropertyDescriptor(ThisExpression.class, "qualifier", Name.class, OPTIONAL, NO_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(ThisExpression.class, propertyList); |
| addProperty(QUALIFIER_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 optional qualifier; <code>null</code> for none; defaults to none. |
| */ |
| private Name optionalQualifier = null; |
| |
| /** |
| * Creates a new AST node for a "this" expression owned by the |
| * given AST. By default, there is no qualifier. |
| * |
| * @param ast the AST that is to own this node |
| */ |
| ThisExpression(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 == QUALIFIER_PROPERTY) { |
| if (get) { |
| return getQualifier(); |
| } else { |
| setQualifier((Name) 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 THIS_EXPRESSION; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone0(AST target) { |
| ThisExpression result = new ThisExpression(target); |
| result.setSourceRange(getStartPosition(), getLength()); |
| result.setQualifier((Name) ASTNode.copySubtree(target, getQualifier())); |
| 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, getQualifier()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the qualifier of this "this" expression, or |
| * <code>null</code> if there is none. |
| * |
| * @return the qualifier name node, or <code>null</code> if there is none |
| */ |
| public Name getQualifier() { |
| return this.optionalQualifier; |
| } |
| |
| /** |
| * Sets or clears the qualifier of this "this" expression. |
| * |
| * @param name the qualifier name 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> |
| * </ul> |
| */ |
| public void setQualifier(Name name) { |
| ASTNode oldChild = this.optionalQualifier; |
| preReplaceChild(oldChild, name, QUALIFIER_PROPERTY); |
| this.optionalQualifier = name; |
| postReplaceChild(oldChild, name, QUALIFIER_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| // treat Operator as free |
| return BASE_NODE_SIZE + 1 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.optionalQualifier == null ? 0 : getQualifier().treeSize()); |
| } |
| } |