| /******************************************************************************* |
| * 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; |
| |
| /** |
| * Conditional expression AST node type. |
| * |
| * <pre> |
| * ConditionalExpression: |
| * Expression <b>?</b> Expression <b>:</b> Expression |
| * </pre> |
| * |
| * @since 2.0 |
| */ |
| public class ConditionalExpression extends Expression { |
| |
| /** |
| * The "expression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(ConditionalExpression.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "thenExpression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor THEN_EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(ConditionalExpression.class, "thenExpression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| |
| /** |
| * The "elseExpression" structural property of this node type. |
| * @since 3.0 |
| */ |
| public static final ChildPropertyDescriptor ELSE_EXPRESSION_PROPERTY = |
| new ChildPropertyDescriptor(ConditionalExpression.class, "elseExpression", 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 { |
| createPropertyList(ConditionalExpression.class); |
| addProperty(EXPRESSION_PROPERTY); |
| addProperty(THEN_EXPRESSION_PROPERTY); |
| addProperty(ELSE_EXPRESSION_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>LEVEL |
| |
| * @return a list of property descriptors (element type: |
| * {@link StructuralPropertyDescriptor}) |
| * @since 3.0 |
| */ |
| public static List propertyDescriptors(int apiLevel) { |
| return PROPERTY_DESCRIPTORS; |
| } |
| |
| /** |
| * The condition expression; lazily initialized; defaults to an unspecified, |
| * but legal, expression. |
| */ |
| private Expression conditionExpression = null; |
| |
| /** |
| * The "then" expression; lazily initialized; defaults to an unspecified, |
| * but legal, expression. |
| */ |
| private Expression thenExpression = null; |
| |
| /** |
| * The "else" expression; lazily initialized; defaults to an unspecified, |
| * but legal, expression. |
| */ |
| private Expression elseExpression = null; |
| |
| /** |
| * Creates a new unparented conditional expression node owned by the given |
| * AST. By default, the condition, "then", and "else" expresssions are |
| * unspecified, but legal. |
| * <p> |
| * N.B. This constructor is package-private. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| ConditionalExpression(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 == THEN_EXPRESSION_PROPERTY) { |
| if (get) { |
| return getThenExpression(); |
| } else { |
| setThenExpression((Expression) child); |
| return null; |
| } |
| } |
| if (property == ELSE_EXPRESSION_PROPERTY) { |
| if (get) { |
| return getElseExpression(); |
| } else { |
| setElseExpression((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. |
| */ |
| public int getNodeType() { |
| return CONDITIONAL_EXPRESSION; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone(AST target) { |
| ConditionalExpression result = new ConditionalExpression(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.setExpression((Expression) getExpression().clone(target)); |
| result.setThenExpression( |
| (Expression) getThenExpression().clone(target)); |
| result.setElseExpression( |
| (Expression) getElseExpression().clone(target)); |
| return result; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| public boolean subtreeMatch(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, getExpression()); |
| acceptChild(visitor, getThenExpression()); |
| acceptChild(visitor, getElseExpression()); |
| } |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the condition of this conditional expression. |
| * |
| * @return the condition node |
| */ |
| public Expression getExpression() { |
| if (this.conditionExpression == null) { |
| preLazyInit(); |
| this.conditionExpression = new SimpleName(this.ast); |
| postLazyInit(this.conditionExpression, EXPRESSION_PROPERTY); |
| } |
| return this.conditionExpression; |
| } |
| |
| /** |
| * Sets the condition of this conditional expression. |
| * |
| * @param expression the condition 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.conditionExpression; |
| preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| this.conditionExpression = expression; |
| postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| } |
| |
| /** |
| * Returns the "then" part of this conditional expression. |
| * |
| * @return the "then" expression node |
| */ |
| public Expression getThenExpression() { |
| if (this.thenExpression == null) { |
| preLazyInit(); |
| this.thenExpression = new SimpleName(this.ast); |
| postLazyInit(this.thenExpression, THEN_EXPRESSION_PROPERTY); |
| } |
| return this.thenExpression; |
| } |
| |
| /** |
| * Sets the "then" part of this conditional expression. |
| * |
| * @param expression the "then" 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 setThenExpression(Expression expression) { |
| if (expression == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.thenExpression; |
| preReplaceChild(oldChild, expression, THEN_EXPRESSION_PROPERTY); |
| this.thenExpression = expression; |
| postReplaceChild(oldChild, expression, THEN_EXPRESSION_PROPERTY); |
| } |
| |
| /** |
| * Returns the "else" part of this conditional expression. |
| * |
| * @return the "else" expression node |
| */ |
| public Expression getElseExpression() { |
| if (this.elseExpression == null) { |
| preLazyInit(); |
| this.elseExpression = new SimpleName(this.ast); |
| postLazyInit(this.elseExpression, ELSE_EXPRESSION_PROPERTY); |
| } |
| return this.elseExpression; |
| } |
| |
| /** |
| * Sets the "else" part of this conditional expression. |
| * |
| * @param expression the "else" 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 setElseExpression(Expression expression) { |
| if (expression == null) { |
| throw new IllegalArgumentException(); |
| } |
| ASTNode oldChild = this.elseExpression; |
| preReplaceChild(oldChild, expression, ELSE_EXPRESSION_PROPERTY); |
| this.elseExpression = expression; |
| postReplaceChild(oldChild, expression, ELSE_EXPRESSION_PROPERTY); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| // treat Code as free |
| return BASE_NODE_SIZE + 3 * 4; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return |
| memSize() |
| + (this.conditionExpression == null ? 0 : getExpression().treeSize()) |
| + (this.thenExpression == null ? 0 : getThenExpression().treeSize()) |
| + (this.elseExpression == null ? 0 : getElseExpression().treeSize()); |
| } |
| } |