/*******************************************************************************
* Copyright (c) 2000, 2010 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;
/**
* AST node for a qualified name. A qualified name is defined recursively
* as a simple name preceded by a name, which qualifies it. Expressing it this
* way means that the qualifier and the simple name get their own AST nodes.
* <pre>
* QualifiedName:
* Name <b>.</b> SimpleName
* </pre>
* <p>
* See <code>FieldAccess</code> for guidelines on handling other expressions
* that resemble qualified names.
* </p>
*
* @see FieldAccess
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class QualifiedName extends Name {
/**
* The "qualifier" structural property of this node type (child type: {@link Name}).
* @since 3.0
*/
public static final ChildPropertyDescriptor QUALIFIER_PROPERTY =
new ChildPropertyDescriptor(QualifiedName.class, "qualifier", Name.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* The "name" structural property of this node type (child type: {@link SimpleName}).
* @since 3.0
*/
public static final ChildPropertyDescriptor NAME_PROPERTY =
new ChildPropertyDescriptor(QualifiedName.class, "name", SimpleName.class, MANDATORY, 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(QualifiedName.class, propertyList);
addProperty(QUALIFIER_PROPERTY, propertyList);
addProperty(NAME_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})
* @since 3.0
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The identifier; lazily initialized; defaults to a unspecified, legal
* Java identifier.
*/
private Name qualifier = null;
/**
* The name being qualified; lazily initialized; defaults to a unspecified,
* legal Java identifier.
*/
private SimpleName name = null;
/**
* Creates a new AST node for a qualified name owned by the given AST.
* <p>
* N.B. This constructor is package-private; all subclasses must be
* declared in the same package; clients are unable to declare
* additional subclasses.
* </p>
*
* @param ast the AST that is to own this node
*/
QualifiedName(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 == QUALIFIER_PROPERTY) {
if (get) {
return getQualifier();
} else {
setQualifier((Name) child);
return null;
}
}
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 int getNodeType0() {
return QUALIFIED_NAME;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
ASTNode clone0(AST target) {
QualifiedName result = new QualifiedName(target);
result.setSourceRange(getStartPosition(), getLength());
result.setQualifier((Name) getQualifier().clone(target));
result.setName((SimpleName) getName().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) {
// visit children in normal left to right reading order
acceptChild(visitor, getQualifier());
acceptChild(visitor, getName());
}
visitor.endVisit(this);
}
/**
* Returns the qualifier part of this qualified name.
*
* @return the qualifier part of this qualified name
*/
public Name getQualifier() {
if (this.qualifier == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.qualifier == null) {
preLazyInit();
this.qualifier = new SimpleName(this.ast);
postLazyInit(this.qualifier, QUALIFIER_PROPERTY);
}
}
}
return this.qualifier;
}
/**
* Sets the qualifier of this qualified name to the given name.
*
* @param qualifier the qualifier of this qualified name
* @exception IllegalArgumentException if:
* <ul>
* <li>the node belongs to a different AST</li>
* <li>the node already has a parent</li>
* <li>a cycle in would be created</li>
* </ul>
*/
public void setQualifier(Name qualifier) {
if (qualifier == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.qualifier;
preReplaceChild(oldChild, qualifier, QUALIFIER_PROPERTY);
this.qualifier = qualifier;
postReplaceChild(oldChild, qualifier, QUALIFIER_PROPERTY);
}
/**
* Returns the name part of this qualified name.
*
* @return the name being qualified
*/
public SimpleName getName() {
if (this.name == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.name == null) {
preLazyInit();
this.name = new SimpleName(this.ast);
postLazyInit(this.name, NAME_PROPERTY);
}
}
}
return this.name;
}
/**
* Sets the name part of this qualified name to the given simple name.
*
* @param name the identifier of this qualified name
* @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 name) {
if (name == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.name;
preReplaceChild(oldChild, name, NAME_PROPERTY);
this.name = name;
postReplaceChild(oldChild, name, NAME_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on Name.
*/
void appendName(StringBuffer buffer) {
getQualifier().appendName(buffer);
buffer.append('.');
getName().appendName(buffer);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int memSize() {
return BASE_NAME_NODE_SIZE + 3 * 4;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return
memSize()
+ (this.name == null ? 0 : getName().treeSize())
+ (this.qualifier == null ? 0 : getQualifier().treeSize());
}
}