/******************************************************************************* * 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 net.sourceforge.phpdt.core.dom; import java.util.ArrayList; import java.util.List; /** * Switch statement AST node type. *
*
* SwitchStatement: * switch ( Expression ) * { { SwitchCase | Statement } } } * SwitchCase: * case Expression : * default : **
SwitchCase
nodes are treated as a kind of
* Statement
.
*
*
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class SwitchStatement extends Statement {
/**
* The "expression" structural property of this node type.
* @since 3.0
*/
public static final ChildPropertyDescriptor EXPRESSION_PROPERTY =
new ChildPropertyDescriptor(SwitchStatement.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* The "statements" structural property of this node type.
* @since 3.0
*/
public static final ChildListPropertyDescriptor STATEMENTS_PROPERTY =
new ChildListPropertyDescriptor(SwitchStatement.class, "statements", Statement.class, 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(3);
createPropertyList(SwitchStatement.class, propertyList);
addProperty(EXPRESSION_PROPERTY, propertyList);
addProperty(STATEMENTS_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
* AST.JLS*
constants
* @return a list of property descriptors (element type:
* {@link StructuralPropertyDescriptor})
* @since 3.0
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The expression; lazily initialized; defaults to a unspecified, but legal,
* expression.
*/
private Expression expression = null;
/**
* The statements and SwitchCase nodes
* (element type: Statement
).
* Defaults to an empty list.
*/
private ASTNode.NodeList statements =
new ASTNode.NodeList(STATEMENTS_PROPERTY);
/**
* Creates a new unparented switch statement node owned by the given
* AST. By default, the swicth statement has an unspecified, but legal,
* expression, and an empty list of switch groups.
* * N.B. This constructor is package-private. *
* * @param ast the AST that is to own this node */ SwitchStatement(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; } } // 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 == STATEMENTS_PROPERTY) { return statements(); } // allow default implementation to flag the error return super.internalGetChildListProperty(property); } /* (omit javadoc for this method) * Method declared on ASTNode. */ final int getNodeType0() { return SWITCH_STATEMENT; } /* (omit javadoc for this method) * Method declared on ASTNode. */ ASTNode clone0(AST target) { SwitchStatement result = new SwitchStatement(target); result.setSourceRange(this.getStartPosition(), this.getLength()); result.copyLeadingComment(this); result.setExpression((Expression) getExpression().clone(target)); result.statements().addAll(ASTNode.copySubtrees(target, statements())); 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()); acceptChildren(visitor, this.statements); } visitor.endVisit(this); } /** * Returns the expression of this switch statement. * * @return the expression node */ public Expression getExpression() { if (this.expression == null) { // lazy init must be thread-safe for readers synchronized (this) { if (this.expression == null) { preLazyInit(); this.expression = new SimpleName(this.ast); postLazyInit(this.expression, EXPRESSION_PROPERTY); } } } return this.expression; } /** * Sets the expression of this switch statement. * * @param expression the new expression node * @exception IllegalArgumentException if: *SwitchCase
nodes mark the start of
* the switch groups.
*
* @return the live list of statement nodes
* (element type: Statement
)
*/
public List statements() {
return this.statements;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int memSize() {
return super.memSize() + 2 * 4;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return
memSize()
+ (this.expression == null ? 0 : getExpression().treeSize())
+ this.statements.listSize();
}
}