/*******************************************************************************
* Copyright (c) 2003, 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 org.eclipse.jdt.core.dom;
import java.util.ArrayList;
import java.util.List;
/**
* Type parameter node (added in JLS3 API).
*
* <pre>
* TypeParameter:
* TypeVariable [ <b>extends</b> Type { <b>&</b> Type } ]
* </pre>
*
* @since 3.1
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class TypeParameter extends ASTNode {
/**
* The "name" structural property of this node type.
*/
public static final ChildPropertyDescriptor NAME_PROPERTY=
new ChildPropertyDescriptor(TypeParameter.class, "name", SimpleName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
/**
* The "typeBounds" structural property of this node type.
*/
public static final ChildListPropertyDescriptor TYPE_BOUNDS_PROPERTY=
new ChildListPropertyDescriptor(TypeParameter.class, "typeBounds", Type.class, NO_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(TypeParameter.class, propertyList);
addProperty(NAME_PROPERTY, propertyList);
addProperty(TYPE_BOUNDS_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 <code>AST.JLS*</code> constants
*
* @return a list of property descriptors (element type: {@link StructuralPropertyDescriptor})
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The type variable node; lazily initialized; defaults to an unspecfied, but legal, name.
*/
private SimpleName typeVariableName= null;
/**
* The type bounds (element type: <code>Type</code>). Defaults to an empty list.
*/
private ASTNode.NodeList typeBounds=
new ASTNode.NodeList(TYPE_BOUNDS_PROPERTY);
/**
* Creates a new unparented node for a parameterized type owned by the given AST. By default, an
* unspecified, but legal, type variable name, and no type bounds.
* <p>
* N.B. This constructor is package-private.
* </p>
*
* @param ast the AST that is to own this node
*/
TypeParameter(AST ast) {
super(ast);
unsupportedIn2();
}
/* (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 == NAME_PROPERTY) {
if (get) {
return getName();
} else {
setName((SimpleName)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 == TYPE_BOUNDS_PROPERTY) {
return typeBounds();
}
// allow default implementation to flag the error
return super.internalGetChildListProperty(property);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final int getNodeType0() {
return TYPE_PARAMETER;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
ASTNode clone0(AST target) {
TypeParameter result= new TypeParameter(target);
result.setSourceRange(getStartPosition(), getLength());
result.setName((SimpleName)((ASTNode)getName()).clone(target));
result.typeBounds().addAll(
ASTNode.copySubtrees(target, typeBounds()));
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, getName());
acceptChildren(visitor, this.typeBounds);
}
visitor.endVisit(this);
}
/**
* Returns the name of the type variable declared in this type parameter.
*
* @return the name of the type variable
*/
public SimpleName getName() {
if (this.typeVariableName == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.typeVariableName == null) {
preLazyInit();
this.typeVariableName= new SimpleName(this.ast);
postLazyInit(this.typeVariableName, NAME_PROPERTY);
}
}
}
return this.typeVariableName;
}
/**
* Resolves and returns the binding for this type parameter.
* <p>
* Note that bindings are generally unavailable unless requested when the AST is being built.
* </p>
*
* @return the binding, or <code>null</code> if the binding cannot be resolved
*/
public final ITypeBinding resolveBinding() {
return this.ast.getBindingResolver().resolveTypeParameter(this);
}
/**
* Sets the name of the type variable of this type parameter to the given name.
*
* @param typeName the new name of this type parameter
* @exception IllegalArgumentException if:
* <ul>
* <li>the node belongs to a different AST</li>
* <li>the node already has a parent</li>
* </ul>
*/
public void setName(SimpleName typeName) {
if (typeName == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild= this.typeVariableName;
preReplaceChild(oldChild, typeName, NAME_PROPERTY);
this.typeVariableName= typeName;
postReplaceChild(oldChild, typeName, NAME_PROPERTY);
}
/**
* Returns the live ordered list of type bounds of this type parameter. For the type parameter
* to be plausible, there can be at most one class in the list, and it must be first, and the
* remaining ones must be interfaces; the list should not contain primitive types (but array
* types and parameterized types are allowed).
*
* @return the live list of type bounds (element type: <code>Type</code>)
*/
public List typeBounds() {
return this.typeBounds;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int memSize() {
// treat Code as free
return BASE_NODE_SIZE + 2 * 4;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return memSize()
+ (this.typeVariableName == null ? 0 : getName().treeSize())
+ this.typeBounds.listSize();
}
}