/*******************************************************************************
* Copyright (c) 2000, 2013 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;
/**
* Conditional expression AST node type.
*
* <pre>
* ConditionalExpression:
* Expression <b>?</b> Expression <b>:</b> Expression
* </pre>
*
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
@SuppressWarnings("rawtypes")
public class ConditionalExpression extends Expression {
/**
* The "expression" structural property of this node type (child type: {@link Expression}).
* @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 (child type: {@link Expression}).
* @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 (child type: {@link Expression}).
* @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 {
List properyList = new ArrayList(4);
createPropertyList(ConditionalExpression.class, properyList);
addProperty(EXPRESSION_PROPERTY, properyList);
addProperty(THEN_EXPRESSION_PROPERTY, properyList);
addProperty(ELSE_EXPRESSION_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 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.
*/
final int getNodeType0() {
return CONDITIONAL_EXPRESSION;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
ASTNode clone0(AST target) {
ConditionalExpression result = new ConditionalExpression(target);
result.setSourceRange(getStartPosition(), 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.
*/
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, 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) {
// lazy init must be thread-safe for readers
synchronized (this) {
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) {
// lazy init must be thread-safe for readers
synchronized (this) {
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) {
// lazy init must be thread-safe for readers
synchronized (this) {
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());
}
}