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/*******************************************************************************
* Copyright (c) 2011, 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;
/**
* Type node for an union type (added in JLS4 API).
*
* UnionType:
* Type | Type { | Type }
*
*
* This kind of node is used inside a catch clause's formal parameter type.
*
*
* @since 3.7.1
* @noinstantiate This class is not intended to be instantiated by clients.
*/
@SuppressWarnings({"rawtypes", "unchecked"})
public class UnionType extends Type {
/**
* The "types" structural property of this node type (element type: {@link Type}).
*/
public static final ChildListPropertyDescriptor TYPES_PROPERTY =
new ChildListPropertyDescriptor(UnionType.class, "types", Type.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(2);
createPropertyList(UnionType.class, propertyList);
addProperty(TYPES_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})
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The list of types (element type: {@link Type}). Defaults to an empty list.
*/
private final ASTNode.NodeList types = new ASTNode.NodeList(TYPES_PROPERTY);
/**
* Creates a new unparented node for an union type owned by the given AST.
* By default, it has no types.
*
* N.B. This constructor is package-private.
*
*
* @param ast the AST that is to own this node
*/
UnionType(AST ast) {
super(ast);
unsupportedIn2_3();
}
@Override
final List internalStructuralPropertiesForType(int apiLevel) {
return propertyDescriptors(apiLevel);
}
@Override
final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
if (property == TYPES_PROPERTY) {
return types();
}
// allow default implementation to flag the error
return super.internalGetChildListProperty(property);
}
@Override
final int getNodeType0() {
return UNION_TYPE;
}
@Override
ASTNode clone0(AST target) {
UnionType result = new UnionType(target);
result.setSourceRange(getStartPosition(), getLength());
result.types().addAll(
ASTNode.copySubtrees(target, types()));
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
acceptChildren(visitor, this.types);
}
visitor.endVisit(this);
}
/**
* Returns the live ordered list of types in this union type.
* Adding and removing nodes from this list affects this node
* dynamically. All nodes in this list must be
* Type
s; attempts to add any other
* type of node will trigger an exception.
*
* @return the live list of types in this union type (element type: {@link Type})
*/
public List types() {
return this.types;
}
@Override
int memSize() {
return BASE_NODE_SIZE + 1 * 4;
}
@Override
int treeSize() {
return
memSize()
+ this.types.listSize();
}
}