/*******************************************************************************
* Copyright (c) 2000, 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.Iterator;
import java.util.List;
/**
* Single variable declaration AST node type. Single variable declaration nodes are used in a
* limited number of places, including formal parameter lists and catch clauses. They are not used
* for field declarations and regular variable declaration statements. For JLS2:
*
* <pre>
* SingleVariableDeclaration:
* { Modifier } Type Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ]
* </pre>
*
* For JLS3, the modifier flags were replaced by a list of modifier nodes (intermixed with
* annotations), and the variable arity indicator was added:
*
* <pre>
* SingleVariableDeclaration:
* { ExtendedModifier } Type [ <b>...</b> ] Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ]
* </pre>
*
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class SingleVariableDeclaration extends VariableDeclaration {
/**
* The "modifiers" structural property of this node type (JLS2 API only).
*
* @since 3.0
*/
public static final SimplePropertyDescriptor MODIFIERS_PROPERTY=
new SimplePropertyDescriptor(SingleVariableDeclaration.class, "modifiers", int.class, MANDATORY); //$NON-NLS-1$
/**
* The "modifiers" structural property of this node type (added in JLS3 API).
*
* @since 3.1
*/
public static final ChildListPropertyDescriptor MODIFIERS2_PROPERTY=
new ChildListPropertyDescriptor(SingleVariableDeclaration.class, "modifiers", IExtendedModifier.class, CYCLE_RISK); //$NON-NLS-1$
/**
* The "name" structural property of this node type.
*
* @since 3.0
*/
public static final ChildPropertyDescriptor NAME_PROPERTY=
new ChildPropertyDescriptor(SingleVariableDeclaration.class, "name", SimpleName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
/**
* The "type" structural property of this node type.
*
* @since 3.0
*/
public static final ChildPropertyDescriptor TYPE_PROPERTY=
new ChildPropertyDescriptor(SingleVariableDeclaration.class, "type", Type.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
/**
* The "varargs" structural property of this node type (added in JLS3 API).
*
* @since 3.1
*/
public static final SimplePropertyDescriptor VARARGS_PROPERTY=
new SimplePropertyDescriptor(SingleVariableDeclaration.class, "varargs", boolean.class, MANDATORY); //$NON-NLS-1$
/**
* The "extraDimensions" structural property of this node type.
*
* @since 3.0
*/
public static final SimplePropertyDescriptor EXTRA_DIMENSIONS_PROPERTY=
new SimplePropertyDescriptor(SingleVariableDeclaration.class, "extraDimensions", int.class, MANDATORY); //$NON-NLS-1$
/**
* The "initializer" structural property of this node type.
*
* @since 3.0
*/
public static final ChildPropertyDescriptor INITIALIZER_PROPERTY=
new ChildPropertyDescriptor(SingleVariableDeclaration.class, "initializer", Expression.class, OPTIONAL, CYCLE_RISK); //$NON-NLS-1$
/**
* A list of property descriptors (element type: {@link StructuralPropertyDescriptor}), or null
* if uninitialized.
*
* @since 3.0
*/
private static final List PROPERTY_DESCRIPTORS_2_0;
/**
* A list of property descriptors (element type: {@link StructuralPropertyDescriptor}), or null
* if uninitialized.
*
* @since 3.1
*/
private static final List PROPERTY_DESCRIPTORS_3_0;
static {
List propertyList= new ArrayList(6);
createPropertyList(SingleVariableDeclaration.class, propertyList);
addProperty(MODIFIERS_PROPERTY, propertyList);
addProperty(TYPE_PROPERTY, propertyList);
addProperty(NAME_PROPERTY, propertyList);
addProperty(EXTRA_DIMENSIONS_PROPERTY, propertyList);
addProperty(INITIALIZER_PROPERTY, propertyList);
PROPERTY_DESCRIPTORS_2_0= reapPropertyList(propertyList);
propertyList= new ArrayList(7);
createPropertyList(SingleVariableDeclaration.class, propertyList);
addProperty(MODIFIERS2_PROPERTY, propertyList);
addProperty(TYPE_PROPERTY, propertyList);
addProperty(VARARGS_PROPERTY, propertyList);
addProperty(NAME_PROPERTY, propertyList);
addProperty(EXTRA_DIMENSIONS_PROPERTY, propertyList);
addProperty(INITIALIZER_PROPERTY, propertyList);
PROPERTY_DESCRIPTORS_3_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 <code>AST.JLS*</code> constants
* @return a list of property descriptors (element type: {@link StructuralPropertyDescriptor})
* @since 3.0
*/
public static List propertyDescriptors(int apiLevel) {
if (apiLevel == AST.JLS2_INTERNAL) {
return PROPERTY_DESCRIPTORS_2_0;
} else {
return PROPERTY_DESCRIPTORS_3_0;
}
}
/**
* The extended modifiers (element type: <code>IExtendedModifier</code>). Null in JLS2. Added in
* JLS3; defaults to an empty list (see constructor).
*
* @since 3.1
*/
private ASTNode.NodeList modifiers= null;
/**
* The modifiers; bit-wise or of Modifier flags. Defaults to none. Not used in 3.0.
*/
private int modifierFlags= Modifier.NONE;
/**
* The variable name; lazily initialized; defaults to a unspecified, legal Java identifier.
*/
private SimpleName variableName= null;
/**
* The type; lazily initialized; defaults to a unspecified, legal type.
*/
private Type type= null;
/**
* Indicates the last parameter of a variable arity method; defaults to false.
*
* @since 3.1
*/
private boolean variableArity= false;
/**
* The number of extra array dimensions that appear after the variable; defaults to 0.
*
* @since 2.1
*/
private int extraArrayDimensions= 0;
/**
* The initializer expression, or <code>null</code> if none; defaults to none.
*/
private Expression optionalInitializer= null;
/**
* Creates a new AST node for a variable declaration owned by the given AST. By default, the
* variable declaration has: no modifiers, an unspecified (but legal) type, an unspecified (but
* legal) variable name, 0 dimensions after the variable; no initializer; not variable arity.
* <p>
* N.B. This constructor is package-private.
* </p>
*
* @param ast the AST that is to own this node
*/
SingleVariableDeclaration(AST ast) {
super(ast);
if (ast.apiLevel >= AST.JLS3) {
this.modifiers= new ASTNode.NodeList(MODIFIERS2_PROPERTY);
}
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
* @since 3.1
*/
final SimplePropertyDescriptor internalExtraDimensionsProperty() {
return EXTRA_DIMENSIONS_PROPERTY;
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
* @since 3.1
*/
final ChildPropertyDescriptor internalInitializerProperty() {
return INITIALIZER_PROPERTY;
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
* @since 3.1
*/
final ChildPropertyDescriptor internalNameProperty() {
return NAME_PROPERTY;
}
/* (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 int internalGetSetIntProperty(SimplePropertyDescriptor property, boolean get, int value) {
if (property == MODIFIERS_PROPERTY) {
if (get) {
return getModifiers();
} else {
setModifiers(value);
return 0;
}
}
if (property == EXTRA_DIMENSIONS_PROPERTY) {
if (get) {
return getExtraDimensions();
} else {
setExtraDimensions(value);
return 0;
}
}
// allow default implementation to flag the error
return super.internalGetSetIntProperty(property, get, value);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final boolean internalGetSetBooleanProperty(SimplePropertyDescriptor property, boolean get, boolean value) {
if (property == VARARGS_PROPERTY) {
if (get) {
return isVarargs();
} else {
setVarargs(value);
return false;
}
}
// allow default implementation to flag the error
return super.internalGetSetBooleanProperty(property, get, value);
}
/* (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;
}
}
if (property == TYPE_PROPERTY) {
if (get) {
return getType();
} else {
setType((Type)child);
return null;
}
}
if (property == INITIALIZER_PROPERTY) {
if (get) {
return getInitializer();
} else {
setInitializer((Expression)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 == MODIFIERS2_PROPERTY) {
return modifiers();
}
// allow default implementation to flag the error
return super.internalGetChildListProperty(property);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final int getNodeType0() {
return SINGLE_VARIABLE_DECLARATION;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
ASTNode clone0(AST target) {
SingleVariableDeclaration result= new SingleVariableDeclaration(target);
result.setSourceRange(getStartPosition(), getLength());
if (this.ast.apiLevel == AST.JLS2_INTERNAL) {
result.setModifiers(getModifiers());
} else {
result.modifiers().addAll(ASTNode.copySubtrees(target, modifiers()));
result.setVarargs(isVarargs());
}
result.setType((Type)getType().clone(target));
result.setExtraDimensions(getExtraDimensions());
result.setName((SimpleName)getName().clone(target));
result.setInitializer(
(Expression)ASTNode.copySubtree(target, getInitializer()));
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
if (this.ast.apiLevel >= AST.JLS3) {
acceptChildren(visitor, this.modifiers);
}
acceptChild(visitor, getType());
acceptChild(visitor, getName());
acceptChild(visitor, getInitializer());
}
visitor.endVisit(this);
}
/**
* Returns the live ordered list of modifiers and annotations of this declaration (added in JLS3
* API).
* <p>
* Note that the final modifier is the only meaningful modifier for local variable and formal
* parameter declarations.
* </p>
*
* @return the live list of modifiers and annotations (element type:
* <code>IExtendedModifier</code>)
* @exception UnsupportedOperationException if this operation is used in a JLS2 AST
* @since 3.1
*/
public List modifiers() {
// more efficient than just calling unsupportedIn2() to check
if (this.modifiers == null) {
unsupportedIn2();
}
return this.modifiers;
}
/**
* Returns the modifiers explicitly specified on this declaration.
* <p>
* In the JLS3 API, this method is a convenience method that computes these flags from
* <code>modifiers()</code>.
* </p>
*
* @return the bit-wise or of <code>Modifier</code> constants
* @see Modifier
*/
public int getModifiers() {
// more efficient than checking getAST().API_LEVEL
if (this.modifiers == null) {
// JLS2 behavior - bona fide property
return this.modifierFlags;
} else {
// JLS3 behavior - convenient method
// performance could be improved by caching computed flags
// but this would require tracking changes to this.modifiers
int computedModifierFlags= Modifier.NONE;
for (Iterator it= modifiers().iterator(); it.hasNext();) {
Object x= it.next();
if (x instanceof Modifier) {
computedModifierFlags|= ((Modifier)x).getKeyword().toFlagValue();
}
}
return computedModifierFlags;
}
}
/**
* Sets the modifiers explicitly specified on this declaration (JLS2 API only).
* <p>
* The following modifiers are meaningful for fields: public, private, protected, static, final,
* volatile, and transient. For local variable and formal parameter declarations, the only
* meaningful modifier is final.
* </p>
*
* @param modifiers the given modifiers (bit-wise or of <code>Modifier</code> constants)
* @exception UnsupportedOperationException if this operation is used in an AST later than JLS2
* @see Modifier
* @deprecated In the JLS3 API, this method is replaced by {@link #modifiers()} which contains a
* list of a <code>Modifier</code> nodes.
*/
public void setModifiers(int modifiers) {
internalSetModifiers(modifiers);
}
/**
* Internal synonym for deprecated method. Used to avoid deprecation warnings.
*
* @since 3.1
*/
/*package*/final void internalSetModifiers(int pmodifiers) {
supportedOnlyIn2();
preValueChange(MODIFIERS_PROPERTY);
this.modifierFlags= pmodifiers;
postValueChange(MODIFIERS_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
*/
public SimpleName getName() {
if (this.variableName == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.variableName == null) {
preLazyInit();
this.variableName= new SimpleName(this.ast);
postLazyInit(this.variableName, NAME_PROPERTY);
}
}
}
return this.variableName;
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
*/
public void setName(SimpleName variableName) {
if (variableName == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild= this.variableName;
preReplaceChild(oldChild, variableName, NAME_PROPERTY);
this.variableName= variableName;
postReplaceChild(oldChild, variableName, NAME_PROPERTY);
}
/**
* Returns the type of the variable declared in this variable declaration, exclusive of any
* extra array dimensions.
*
* @return the type
*/
public Type getType() {
if (this.type == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.type == null) {
preLazyInit();
this.type= this.ast.newPrimitiveType(PrimitiveType.INT);
postLazyInit(this.type, TYPE_PROPERTY);
}
}
}
return this.type;
}
/**
* Sets the type of the variable declared in this variable declaration to the given type,
* exclusive of any extra array dimensions.
*
* @param type the new type
* @exception IllegalArgumentException if:
* <ul>
* <li>the node belongs to a different AST</li>
* <li>the node already has a parent</li>
* </ul>
*/
public void setType(Type type) {
if (type == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild= this.type;
preReplaceChild(oldChild, type, TYPE_PROPERTY);
this.type= type;
postReplaceChild(oldChild, type, TYPE_PROPERTY);
}
/**
* Returns whether this declaration declares the last parameter of a variable arity method
* (added in JLS3 API).
* <p>
* Note that the binding for the type <code>Foo</code>in the vararg method declaration
* <code>void fun(Foo... args)</code> is always for the type as written; i.e., the type binding
* for <code>Foo</code>. However, if you navigate from the method declaration to its method
* binding to the type binding for its last parameter, the type binding for the vararg parameter
* is always an array type (i.e., <code>Foo[]</code>) reflecting the way vararg methods get
* compiled.
* </p>
*
* @return <code>true</code> if this is a variable arity parameter declaration, and
* <code>false</code> otherwise
* @exception UnsupportedOperationException if this operation is used in a JLS2 AST
* @since 3.1
*/
public boolean isVarargs() {
// more efficient than just calling unsupportedIn2() to check
if (this.modifiers == null) {
unsupportedIn2();
}
return this.variableArity;
}
/**
* Sets whether this declaration declares the last parameter of a variable arity method (added
* in JLS3 API).
*
* @param variableArity <code>true</code> if this is a variable arity parameter declaration, and
* <code>false</code> otherwise
* @since 3.1
*/
public void setVarargs(boolean variableArity) {
// more efficient than just calling unsupportedIn2() to check
if (this.modifiers == null) {
unsupportedIn2();
}
preValueChange(VARARGS_PROPERTY);
this.variableArity= variableArity;
postValueChange(VARARGS_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
* @since 2.1
*/
public int getExtraDimensions() {
return this.extraArrayDimensions;
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
* @since 2.1
*/
public void setExtraDimensions(int dimensions) {
if (dimensions < 0) {
throw new IllegalArgumentException();
}
preValueChange(EXTRA_DIMENSIONS_PROPERTY);
this.extraArrayDimensions= dimensions;
postValueChange(EXTRA_DIMENSIONS_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
*/
public Expression getInitializer() {
return this.optionalInitializer;
}
/* (omit javadoc for this method)
* Method declared on VariableDeclaration.
*/
public void setInitializer(Expression initializer) {
// a SingleVariableDeclaration may occur inside an Expression
// must check cycles
ASTNode oldChild= this.optionalInitializer;
preReplaceChild(oldChild, initializer, INITIALIZER_PROPERTY);
this.optionalInitializer= initializer;
postReplaceChild(oldChild, initializer, INITIALIZER_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int memSize() {
// treat Operator as free
return BASE_NODE_SIZE + 7 * 4;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return memSize()
+ (this.modifiers == null ? 0 : this.modifiers.listSize())
+ (this.type == null ? 0 : getType().treeSize())
+ (this.variableName == null ? 0 : getName().treeSize())
+ (this.optionalInitializer == null ? 0 : getInitializer().treeSize());
}
}