/******************************************************************************* * 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; /** * Expression statement AST node type. *
* This kind of node is used to convert an expression (Expression
)
* into a statement (Statement
) by wrapping it.
*
* ExpressionStatement: * StatementExpression ; ** * @since 2.0 * @noinstantiate This class is not intended to be instantiated by clients. */ public class ExpressionStatement extends Statement { /** * The "expression" structural property of this node type. * @since 3.0 */ public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = new ChildPropertyDescriptor(ExpressionStatement.class, "expression", 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(2); createPropertyList(ExpressionStatement.class, properyList); addProperty(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 *
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;
/**
* Creates a new unparented expression statement node owned by the given
* AST. By default, the expression statement is unspecified, but legal,
* method invocation expression.
* * N.B. This constructor is package-private. *
* * @param ast the AST that is to own this node */ ExpressionStatement(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 int getNodeType0() { return EXPRESSION_STATEMENT; } /* (omit javadoc for this method) * Method declared on ASTNode. */ ASTNode clone0(AST target) { ExpressionStatement result = new ExpressionStatement(target); result.setSourceRange(this.getStartPosition(), this.getLength()); result.copyLeadingComment(this); result.setExpression((Expression) getExpression().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) { acceptChild(visitor, getExpression()); } visitor.endVisit(this); } /** * Returns the expression of this expression 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 MethodInvocation(this.ast); postLazyInit(this.expression, EXPRESSION_PROPERTY); } } } return this.expression; } /** * Sets the expression of this expression statement. * * @param expression the new expression node * @exception IllegalArgumentException if: *