org.eclipse.jdt.core.dom.TypeParameter Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2003, 2019 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 parameter declaration node (added in JLS3 API).
*
*
* TypeParameter:
* { ExtendedModifier } Identifier [ extends Type { & Type } ]
*
*
* @since 3.1
* @noinstantiate This class is not intended to be instantiated by clients.
*/
@SuppressWarnings({"rawtypes", "unchecked"})
public class TypeParameter extends ASTNode {
/**
* The "modifiers" structural property of this node type (element type: {@link IExtendedModifier}) (added in JLS8 API).
* @since 3.10
*/
public static final ChildListPropertyDescriptor MODIFIERS_PROPERTY =
new ChildListPropertyDescriptor(TypeParameter.class, "modifiers", IExtendedModifier.class, CYCLE_RISK); //$NON-NLS-1$
/**
* The "name" structural property of this node type (child type: {@link SimpleName}).
*/
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 (element type: {@link 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;
/**
* A list of property descriptors (element type:
* {@link StructuralPropertyDescriptor}),
* or null if uninitialized.
* @since 3.10
*/
private static final List PROPERTY_DESCRIPTORS_8_0;
static {
List propertyList = new ArrayList(3);
createPropertyList(TypeParameter.class, propertyList);
addProperty(NAME_PROPERTY, propertyList);
addProperty(TYPE_BOUNDS_PROPERTY, propertyList);
PROPERTY_DESCRIPTORS = reapPropertyList(propertyList);
propertyList = new ArrayList(4);
createPropertyList(TypeParameter.class, propertyList);
addProperty(MODIFIERS_PROPERTY, propertyList);
addProperty(NAME_PROPERTY, propertyList);
addProperty(TYPE_BOUNDS_PROPERTY, propertyList);
PROPERTY_DESCRIPTORS_8_0 = 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) {
switch (apiLevel) {
case AST.JLS2_INTERNAL :
case AST.JLS3_INTERNAL :
case AST.JLS4_INTERNAL:
return PROPERTY_DESCRIPTORS;
default :
return PROPERTY_DESCRIPTORS_8_0;
}
}
/**
* The type variable node; lazily initialized; defaults to an unspecified,
* but legal, name.
*/
private SimpleName typeVariableName = null;
/**
* The type bounds (element type: {@link Type}).
* Defaults to an empty list.
*/
private final ASTNode.NodeList typeBounds =
new ASTNode.NodeList(TYPE_BOUNDS_PROPERTY);
/**
* The modifiers (element type: {@link IExtendedModifier}).
* Null in JLS < 8. Added in JLS8; defaults to an empty list
* (see constructor).
*/
private ASTNode.NodeList modifiers = null;
/**
* 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.
*
* N.B. This constructor is package-private.
*
*
* @param ast the AST that is to own this node
*/
TypeParameter(AST ast) {
super(ast);
unsupportedIn2();
if (ast.apiLevel >= AST.JLS8_INTERNAL) {
this.modifiers = new ASTNode.NodeList(MODIFIERS_PROPERTY);
}
}
@Override
final List internalStructuralPropertiesForType(int apiLevel) {
return propertyDescriptors(apiLevel);
}
@Override
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);
}
@Override
final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
if (property == MODIFIERS_PROPERTY) {
return modifiers();
}
if (property == TYPE_BOUNDS_PROPERTY) {
return typeBounds();
}
// allow default implementation to flag the error
return super.internalGetChildListProperty(property);
}
@Override
final int getNodeType0() {
return TYPE_PARAMETER;
}
@Override
ASTNode clone0(AST target) {
TypeParameter result = new TypeParameter(target);
result.setSourceRange(getStartPosition(), getLength());
if (this.ast.apiLevel >= AST.JLS8_INTERNAL) {
result.modifiers().addAll(
ASTNode.copySubtrees(target, modifiers()));
}
result.setName((SimpleName) ((ASTNode) getName()).clone(target));
result.typeBounds().addAll(
ASTNode.copySubtrees(target, typeBounds()));
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
if (this.ast.apiLevel >= AST.JLS8_INTERNAL) {
acceptChildren(visitor, this.modifiers);
}
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.
*
* Note that bindings are generally unavailable unless requested when the
* AST is being built.
*
*
* @return the binding, or null
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:
*
* - the node belongs to a different AST
* - the node already has a parent
*
*/
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: {@link Type})
*/
public List typeBounds() {
return this.typeBounds;
}
/**
* Returns the live ordered list of modifiers for this TypeParameter node (added in JLS8 API).
*
* @return the live list of modifiers (element type: {@link IExtendedModifier})
* @exception UnsupportedOperationException if this operation is used
* in a JLS2, JLS3 or JLS4 AST
* @since 3.10
*/
public List modifiers() {
// more efficient than just calling unsupportedIn2_3_4() to check
if (this.modifiers == null) {
unsupportedIn2_3_4();
}
return this.modifiers;
}
@Override
int memSize() {
// treat Code as free
return BASE_NODE_SIZE + 3 * 4;
}
@Override
int treeSize() {
return
memSize()
+ (this.modifiers == null ? 0 : this.modifiers.listSize())
+ (this.typeVariableName == null ? 0 : getName().treeSize())
+ this.typeBounds.listSize();
}
}