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/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.core.dom;
import java.util.ArrayList;
import java.util.List;
/**
* Labeled statement AST node type.
*
*
* LabeledStatement:
* Identifier : Statement
*
*
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
@SuppressWarnings("rawtypes")
public class LabeledStatement extends Statement {
/**
* The "label" structural property of this node type (child type: {@link SimpleName}).
* @since 3.0
*/
public static final ChildPropertyDescriptor LABEL_PROPERTY =
new ChildPropertyDescriptor(LabeledStatement.class, "label", SimpleName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
/**
* The "body" structural property of this node type (child type: {@link Statement}).
* @since 3.0
*/
public static final ChildPropertyDescriptor BODY_PROPERTY =
new ChildPropertyDescriptor(LabeledStatement.class, "body", Statement.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 propertyList = new ArrayList(3);
createPropertyList(LabeledStatement.class, propertyList);
addProperty(LABEL_PROPERTY, propertyList);
addProperty(BODY_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 label; lazily initialized; defaults to a unspecified,
* legal Java identifier.
*/
private SimpleName labelName = null;
/**
* The body statement; lazily initialized; defaults to an unspecified, but
* legal, statement.
*/
private Statement body = null;
/**
* Creates a new AST node for a labeled statement owned by the given
* AST. By default, the statement has an unspecified (but legal) label
* and an unspecified (but legal) statement.
*
* N.B. This constructor is package-private.
*
*
* @param ast the AST that is to own this node
*/
LabeledStatement(AST ast) {
super(ast);
}
@Override
final List internalStructuralPropertiesForType(int apiLevel) {
return propertyDescriptors(apiLevel);
}
@Override
final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
if (property == LABEL_PROPERTY) {
if (get) {
return getLabel();
} else {
setLabel((SimpleName) child);
return null;
}
}
if (property == BODY_PROPERTY) {
if (get) {
return getBody();
} else {
setBody((Statement) child);
return null;
}
}
// allow default implementation to flag the error
return super.internalGetSetChildProperty(property, get, child);
}
@Override
final int getNodeType0() {
return LABELED_STATEMENT;
}
@Override
ASTNode clone0(AST target) {
LabeledStatement result = new LabeledStatement(target);
result.setSourceRange(getStartPosition(), getLength());
result.setLabel(
(SimpleName) ASTNode.copySubtree(target, getLabel()));
result.setBody(
(Statement) ASTNode.copySubtree(target, getBody()));
return result;
}
@Override
final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
// dispatch to correct overloaded match method
return matcher.match(this, other);
}
@Override
void accept0(ASTVisitor visitor) {
boolean visitChildren = visitor.visit(this);
if (visitChildren) {
// visit children in normal left to right reading order
acceptChild(visitor, getLabel());
acceptChild(visitor, getBody());
}
visitor.endVisit(this);
}
/**
* Returns the label of this labeled statement.
*
* @return the variable name node
*/
public SimpleName getLabel() {
if (this.labelName == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.labelName == null) {
preLazyInit();
this.labelName= new SimpleName(this.ast);
postLazyInit(this.labelName, LABEL_PROPERTY);
}
}
}
return this.labelName;
}
/**
* Sets the label of this labeled statement.
*
* @param label the new label
* @exception IllegalArgumentException if:
*
* - the node belongs to a different AST
* - the node already has a parent
*
*/
public void setLabel(SimpleName label) {
if (label == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.labelName;
preReplaceChild(oldChild, label, LABEL_PROPERTY);
this.labelName = label;
postReplaceChild(oldChild, label, LABEL_PROPERTY);
}
/**
* Returns the body of this labeled statement.
*
* @return the body statement node
*/
public Statement getBody() {
if (this.body == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.body == null) {
preLazyInit();
this.body= new EmptyStatement(this.ast);
postLazyInit(this.body, BODY_PROPERTY);
}
}
}
return this.body;
}
/**
* Sets the body of this labeled statement.
*
* Special note: The Java language does not allow a local variable declaration
* to appear as the body of a labeled statement (they may only appear within a
* block). However, the AST will allow a VariableDeclarationStatement
* as the body of a LabeledStatement
. To get something that will
* compile, be sure to embed the VariableDeclarationStatement
* inside a Block
.
*
*
* @param statement the body statement node
* @exception IllegalArgumentException if:
*
* - the node belongs to a different AST
* - the node already has a parent
* - a cycle in would be created
*
*/
public void setBody(Statement statement) {
if (statement == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.body;
preReplaceChild(oldChild, statement, BODY_PROPERTY);
this.body = statement;
postReplaceChild(oldChild, statement, BODY_PROPERTY);
}
@Override
int memSize() {
return super.memSize() + 2 * 4;
}
@Override
int treeSize() {
return
memSize()
+ (this.labelName == null ? 0 : getLabel().treeSize())
+ (this.body == null ? 0 : getBody().treeSize());
}
}