1 /*******************************************************************************
2 * Copyright (c) 2000, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
12 package net.sourceforge.phpdt.core.dom;
14 import java.util.ArrayList;
15 import java.util.Iterator;
16 import java.util.List;
19 * Single variable declaration AST node type. Single variable
20 * declaration nodes are used in a limited number of places, including formal
21 * parameter lists and catch clauses. They are not used for field declarations
22 * and regular variable declaration statements.
25 * SingleVariableDeclaration:
26 * { Modifier } Type Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ]
28 * For JLS3, the modifier flags were replaced by
29 * a list of modifier nodes (intermixed with annotations), and the variable arity
30 * indicator was added:
32 * SingleVariableDeclaration:
33 * { ExtendedModifier } Type [ <b>...</b> ] Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ]
37 * @noinstantiate This class is not intended to be instantiated by clients.
39 public class SingleVariableDeclaration extends VariableDeclaration {
42 * The "modifiers" structural property of this node type (JLS2 API only).
45 public static final SimplePropertyDescriptor MODIFIERS_PROPERTY =
46 new SimplePropertyDescriptor(SingleVariableDeclaration.class, "modifiers", int.class, MANDATORY); //$NON-NLS-1$
49 * The "modifiers" structural property of this node type (added in JLS3 API).
52 public static final ChildListPropertyDescriptor MODIFIERS2_PROPERTY =
53 new ChildListPropertyDescriptor(SingleVariableDeclaration.class, "modifiers", IExtendedModifier.class, CYCLE_RISK); //$NON-NLS-1$
56 * The "name" structural property of this node type.
59 public static final ChildPropertyDescriptor NAME_PROPERTY =
60 new ChildPropertyDescriptor(SingleVariableDeclaration.class, "name", SimpleName.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
63 * The "type" structural property of this node type.
66 public static final ChildPropertyDescriptor TYPE_PROPERTY =
67 new ChildPropertyDescriptor(SingleVariableDeclaration.class, "type", Type.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$
70 * The "varargs" structural property of this node type (added in JLS3 API).
73 public static final SimplePropertyDescriptor VARARGS_PROPERTY =
74 new SimplePropertyDescriptor(SingleVariableDeclaration.class, "varargs", boolean.class, MANDATORY); //$NON-NLS-1$
77 * The "extraDimensions" structural property of this node type.
80 public static final SimplePropertyDescriptor EXTRA_DIMENSIONS_PROPERTY =
81 new SimplePropertyDescriptor(SingleVariableDeclaration.class, "extraDimensions", int.class, MANDATORY); //$NON-NLS-1$
84 * The "initializer" structural property of this node type.
87 public static final ChildPropertyDescriptor INITIALIZER_PROPERTY =
88 new ChildPropertyDescriptor(SingleVariableDeclaration.class, "initializer", Expression.class, OPTIONAL, CYCLE_RISK); //$NON-NLS-1$
91 * A list of property descriptors (element type:
92 * {@link StructuralPropertyDescriptor}),
93 * or null if uninitialized.
96 private static final List PROPERTY_DESCRIPTORS_2_0;
99 * A list of property descriptors (element type:
100 * {@link StructuralPropertyDescriptor}),
101 * or null if uninitialized.
104 private static final List PROPERTY_DESCRIPTORS_3_0;
107 List propertyList = new ArrayList(6);
108 createPropertyList(SingleVariableDeclaration.class, propertyList);
109 addProperty(MODIFIERS_PROPERTY, propertyList);
110 addProperty(TYPE_PROPERTY, propertyList);
111 addProperty(NAME_PROPERTY, propertyList);
112 addProperty(EXTRA_DIMENSIONS_PROPERTY, propertyList);
113 addProperty(INITIALIZER_PROPERTY, propertyList);
114 PROPERTY_DESCRIPTORS_2_0 = reapPropertyList(propertyList);
116 propertyList = new ArrayList(7);
117 createPropertyList(SingleVariableDeclaration.class, propertyList);
118 addProperty(MODIFIERS2_PROPERTY, propertyList);
119 addProperty(TYPE_PROPERTY, propertyList);
120 addProperty(VARARGS_PROPERTY, propertyList);
121 addProperty(NAME_PROPERTY, propertyList);
122 addProperty(EXTRA_DIMENSIONS_PROPERTY, propertyList);
123 addProperty(INITIALIZER_PROPERTY, propertyList);
124 PROPERTY_DESCRIPTORS_3_0 = reapPropertyList(propertyList);
128 * Returns a list of structural property descriptors for this node type.
129 * Clients must not modify the result.
131 * @param apiLevel the API level; one of the
132 * <code>AST.JLS*</code> constants
133 * @return a list of property descriptors (element type:
134 * {@link StructuralPropertyDescriptor})
137 public static List propertyDescriptors(int apiLevel) {
138 if (apiLevel == AST.JLS2_INTERNAL) {
139 return PROPERTY_DESCRIPTORS_2_0;
141 return PROPERTY_DESCRIPTORS_3_0;
146 * The extended modifiers (element type: <code>IExtendedModifier</code>).
147 * Null in JLS2. Added in JLS3; defaults to an empty list
152 private ASTNode.NodeList modifiers = null;
155 * The modifiers; bit-wise or of Modifier flags.
156 * Defaults to none. Not used in 3.0.
158 private int modifierFlags = Modifier.NONE;
161 * The variable name; lazily initialized; defaults to a unspecified,
162 * legal Java identifier.
164 private SimpleName variableName = null;
167 * The type; lazily initialized; defaults to a unspecified,
170 private Type type = null;
173 * Indicates the last parameter of a variable arity method;
178 private boolean variableArity = false;
181 * The number of extra array dimensions that appear after the variable;
186 private int extraArrayDimensions = 0;
189 * The initializer expression, or <code>null</code> if none;
192 private Expression optionalInitializer = null;
195 * Creates a new AST node for a variable declaration owned by the given
196 * AST. By default, the variable declaration has: no modifiers, an
197 * unspecified (but legal) type, an unspecified (but legal) variable name,
198 * 0 dimensions after the variable; no initializer; not variable arity.
200 * N.B. This constructor is package-private.
203 * @param ast the AST that is to own this node
205 SingleVariableDeclaration(AST ast) {
207 if (ast.apiLevel >= AST.JLS3) {
208 this.modifiers = new ASTNode.NodeList(MODIFIERS2_PROPERTY);
212 /* (omit javadoc for this method)
213 * Method declared on VariableDeclaration.
216 final SimplePropertyDescriptor internalExtraDimensionsProperty() {
217 return EXTRA_DIMENSIONS_PROPERTY;
220 /* (omit javadoc for this method)
221 * Method declared on VariableDeclaration.
224 final ChildPropertyDescriptor internalInitializerProperty() {
225 return INITIALIZER_PROPERTY;
228 /* (omit javadoc for this method)
229 * Method declared on VariableDeclaration.
232 final ChildPropertyDescriptor internalNameProperty() {
233 return NAME_PROPERTY;
236 /* (omit javadoc for this method)
237 * Method declared on ASTNode.
239 final List internalStructuralPropertiesForType(int apiLevel) {
240 return propertyDescriptors(apiLevel);
243 /* (omit javadoc for this method)
244 * Method declared on ASTNode.
246 final int internalGetSetIntProperty(SimplePropertyDescriptor property, boolean get, int value) {
247 if (property == MODIFIERS_PROPERTY) {
249 return getModifiers();
255 if (property == EXTRA_DIMENSIONS_PROPERTY) {
257 return getExtraDimensions();
259 setExtraDimensions(value);
263 // allow default implementation to flag the error
264 return super.internalGetSetIntProperty(property, get, value);
267 /* (omit javadoc for this method)
268 * Method declared on ASTNode.
270 final boolean internalGetSetBooleanProperty(SimplePropertyDescriptor property, boolean get, boolean value) {
271 if (property == VARARGS_PROPERTY) {
279 // allow default implementation to flag the error
280 return super.internalGetSetBooleanProperty(property, get, value);
283 /* (omit javadoc for this method)
284 * Method declared on ASTNode.
286 final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
287 if (property == NAME_PROPERTY) {
291 setName((SimpleName) child);
295 if (property == TYPE_PROPERTY) {
299 setType((Type) child);
303 if (property == INITIALIZER_PROPERTY) {
305 return getInitializer();
307 setInitializer((Expression) child);
311 // allow default implementation to flag the error
312 return super.internalGetSetChildProperty(property, get, child);
315 /* (omit javadoc for this method)
316 * Method declared on ASTNode.
318 final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
319 if (property == MODIFIERS2_PROPERTY) {
322 // allow default implementation to flag the error
323 return super.internalGetChildListProperty(property);
326 /* (omit javadoc for this method)
327 * Method declared on ASTNode.
329 final int getNodeType0() {
330 return SINGLE_VARIABLE_DECLARATION;
333 /* (omit javadoc for this method)
334 * Method declared on ASTNode.
336 ASTNode clone0(AST target) {
337 SingleVariableDeclaration result = new SingleVariableDeclaration(target);
338 result.setSourceRange(this.getStartPosition(), this.getLength());
339 if (this.ast.apiLevel == AST.JLS2_INTERNAL) {
340 result.setModifiers(getModifiers());
342 result.modifiers().addAll(ASTNode.copySubtrees(target, modifiers()));
343 result.setVarargs(isVarargs());
345 result.setType((Type) getType().clone(target));
346 result.setExtraDimensions(getExtraDimensions());
347 result.setName((SimpleName) getName().clone(target));
348 result.setInitializer(
349 (Expression) ASTNode.copySubtree(target, getInitializer()));
353 /* (omit javadoc for this method)
354 * Method declared on ASTNode.
356 final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
357 // dispatch to correct overloaded match method
358 return matcher.match(this, other);
361 /* (omit javadoc for this method)
362 * Method declared on ASTNode.
364 void accept0(ASTVisitor visitor) {
365 boolean visitChildren = visitor.visit(this);
367 // visit children in normal left to right reading order
368 if (this.ast.apiLevel >= AST.JLS3) {
369 acceptChildren(visitor, this.modifiers);
371 acceptChild(visitor, getType());
372 acceptChild(visitor, getName());
373 acceptChild(visitor, getInitializer());
375 visitor.endVisit(this);
379 * Returns the live ordered list of modifiers and annotations
380 * of this declaration (added in JLS3 API).
382 * Note that the final modifier is the only meaningful modifier for local
383 * variable and formal parameter declarations.
386 * @return the live list of modifiers and annotations
387 * (element type: <code>IExtendedModifier</code>)
388 * @exception UnsupportedOperationException if this operation is used in
392 public List modifiers() {
393 // more efficient than just calling unsupportedIn2() to check
394 if (this.modifiers == null) {
397 return this.modifiers;
401 * Returns the modifiers explicitly specified on this declaration.
403 * In the JLS3 API, this method is a convenience method that
404 * computes these flags from <code>modifiers()</code>.
407 * @return the bit-wise or of <code>Modifier</code> constants
410 public int getModifiers() {
411 // more efficient than checking getAST().API_LEVEL
412 if (this.modifiers == null) {
413 // JLS2 behavior - bona fide property
414 return this.modifierFlags;
416 // JLS3 behavior - convenient method
417 // performance could be improved by caching computed flags
418 // but this would require tracking changes to this.modifiers
419 int computedModifierFlags = Modifier.NONE;
420 for (Iterator it = modifiers().iterator(); it.hasNext(); ) {
421 Object x = it.next();
422 if (x instanceof Modifier) {
423 computedModifierFlags |= ((Modifier) x).getKeyword().toFlagValue();
426 return computedModifierFlags;
431 * Sets the modifiers explicitly specified on this declaration (JLS2 API only).
433 * The following modifiers are meaningful for fields: public, private, protected,
434 * static, final, volatile, and transient. For local variable and formal
435 * parameter declarations, the only meaningful modifier is final.
438 * @param modifiers the given modifiers (bit-wise or of <code>Modifier</code> constants)
439 * @exception UnsupportedOperationException if this operation is used in
440 * an AST later than JLS2
442 * @deprecated In the JLS3 API, this method is replaced by
443 * {@link #modifiers()} which contains a list of a <code>Modifier</code> nodes.
445 public void setModifiers(int modifiers) {
446 internalSetModifiers(modifiers);
450 * Internal synonym for deprecated method. Used to avoid
451 * deprecation warnings.
454 /*package*/ final void internalSetModifiers(int pmodifiers) {
456 preValueChange(MODIFIERS_PROPERTY);
457 this.modifierFlags = pmodifiers;
458 postValueChange(MODIFIERS_PROPERTY);
461 /* (omit javadoc for this method)
462 * Method declared on VariableDeclaration.
464 public SimpleName getName() {
465 if (this.variableName == null) {
466 // lazy init must be thread-safe for readers
467 synchronized (this) {
468 if (this.variableName == null) {
470 this.variableName = new SimpleName(this.ast);
471 postLazyInit(this.variableName, NAME_PROPERTY);
475 return this.variableName;
478 /* (omit javadoc for this method)
479 * Method declared on VariableDeclaration.
481 public void setName(SimpleName variableName) {
482 if (variableName == null) {
483 throw new IllegalArgumentException();
485 ASTNode oldChild = this.variableName;
486 preReplaceChild(oldChild, variableName, NAME_PROPERTY);
487 this.variableName = variableName;
488 postReplaceChild(oldChild, variableName, NAME_PROPERTY);
492 * Returns the type of the variable declared in this variable declaration,
493 * exclusive of any extra array dimensions.
497 public Type getType() {
498 if (this.type == null) {
499 // lazy init must be thread-safe for readers
500 synchronized (this) {
501 if (this.type == null) {
503 this.type = this.ast.newPrimitiveType(PrimitiveType.INT);
504 postLazyInit(this.type, TYPE_PROPERTY);
512 * Sets the type of the variable declared in this variable declaration to
513 * the given type, exclusive of any extra array dimensions.
515 * @param type the new type
516 * @exception IllegalArgumentException if:
518 * <li>the node belongs to a different AST</li>
519 * <li>the node already has a parent</li>
522 public void setType(Type type) {
524 throw new IllegalArgumentException();
526 ASTNode oldChild = this.type;
527 preReplaceChild(oldChild, type, TYPE_PROPERTY);
529 postReplaceChild(oldChild, type, TYPE_PROPERTY);
533 * Returns whether this declaration declares the last parameter of
534 * a variable arity method (added in JLS3 API).
536 * Note that the binding for the type <code>Foo</code>in the vararg method
537 * declaration <code>void fun(Foo... args)</code> is always for the type as
538 * written; i.e., the type binding for <code>Foo</code>. However, if you
539 * navigate from the method declaration to its method binding to the
540 * type binding for its last parameter, the type binding for the vararg
541 * parameter is always an array type (i.e., <code>Foo[]</code>) reflecting
542 * the way vararg methods get compiled.
545 * @return <code>true</code> if this is a variable arity parameter declaration,
546 * and <code>false</code> otherwise
547 * @exception UnsupportedOperationException if this operation is used in
551 public boolean isVarargs() {
552 // more efficient than just calling unsupportedIn2() to check
553 if (this.modifiers == null) {
556 return this.variableArity;
560 * Sets whether this declaration declares the last parameter of
561 * a variable arity method (added in JLS3 API).
563 * @param variableArity <code>true</code> if this is a variable arity
564 * parameter declaration, and <code>false</code> otherwise
567 public void setVarargs(boolean variableArity) {
568 // more efficient than just calling unsupportedIn2() to check
569 if (this.modifiers == null) {
572 preValueChange(VARARGS_PROPERTY);
573 this.variableArity = variableArity;
574 postValueChange(VARARGS_PROPERTY);
577 /* (omit javadoc for this method)
578 * Method declared on VariableDeclaration.
581 public int getExtraDimensions() {
582 return this.extraArrayDimensions;
585 /* (omit javadoc for this method)
586 * Method declared on VariableDeclaration.
589 public void setExtraDimensions(int dimensions) {
590 if (dimensions < 0) {
591 throw new IllegalArgumentException();
593 preValueChange(EXTRA_DIMENSIONS_PROPERTY);
594 this.extraArrayDimensions = dimensions;
595 postValueChange(EXTRA_DIMENSIONS_PROPERTY);
598 /* (omit javadoc for this method)
599 * Method declared on VariableDeclaration.
601 public Expression getInitializer() {
602 return this.optionalInitializer;
605 /* (omit javadoc for this method)
606 * Method declared on VariableDeclaration.
608 public void setInitializer(Expression initializer) {
609 // a SingleVariableDeclaration may occur inside an Expression
611 ASTNode oldChild = this.optionalInitializer;
612 preReplaceChild(oldChild, initializer,INITIALIZER_PROPERTY);
613 this.optionalInitializer = initializer;
614 postReplaceChild(oldChild, initializer,INITIALIZER_PROPERTY);
617 /* (omit javadoc for this method)
618 * Method declared on ASTNode.
621 // treat Operator as free
622 return BASE_NODE_SIZE + 7 * 4;
625 /* (omit javadoc for this method)
626 * Method declared on ASTNode.
631 + (this.modifiers == null ? 0 : this.modifiers.listSize())
632 + (this.type == null ? 0 : getType().treeSize())
633 + (this.variableName == null ? 0 : getName().treeSize())
634 + (this.optionalInitializer == null ? 0 : getInitializer().treeSize());