| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.core.dom; |
| |
| 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 2.0 (corresponding to JLS2): |
| * <pre> |
| * SingleVariableDeclaration: |
| * { Modifier } Type Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ] |
| * </pre> |
| * For 3.0 (corresponding to 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 |
| */ |
| public class SingleVariableDeclaration extends VariableDeclaration { |
| |
| /** |
| * The extended modifiers (element type: <code>ExtendedModifier</code>). |
| * Null in 2.0. Added in 3.0; defaults to an empty list |
| * (see constructor). |
| * |
| * @since 3.0 |
| */ |
| 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 3.0 |
| */ |
| 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.API_LEVEL >= AST.LEVEL_3_0) { |
| this.modifiers = new ASTNode.NodeList(true, ExtendedModifier.class); |
| } |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| public int getNodeType() { |
| return SINGLE_VARIABLE_DECLARATION; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone(AST target) { |
| SingleVariableDeclaration result = new SingleVariableDeclaration(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| if (getAST().API_LEVEL == AST.LEVEL_2_0) { |
| result.setModifiers(getModifiers()); |
| } |
| if (getAST().API_LEVEL >= AST.LEVEL_3_0) { |
| result.modifiers().addAll(ASTNode.copySubtrees(target, modifiers())); |
| result.setVariableArity(isVariableArity()); |
| } |
| 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. |
| */ |
| public boolean subtreeMatch(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 (getAST().API_LEVEL >= AST.LEVEL_3_0) { |
| 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 3.0 API). |
| * <p> |
| * Note that the final modifier is the only meaningful modifier for local |
| * variable and formal parameter declarations. |
| * </p> |
| * <p> |
| * Note: Support for annotation metadata is an experimental language feature |
| * under discussion in JSR-175 and under consideration for inclusion |
| * in the 1.5 release of J2SE. The support here is therefore tentative |
| * and subject to change. |
| * </p> |
| * |
| * @return the live list of modifiers and annotations |
| * (element type: <code>ExtendedModifier</code>) |
| * @exception UnsupportedOperationException if this operation is used in |
| * a 2.0 AST |
| * @since 3.0 |
| */ |
| 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 3.0 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) { |
| // 2.0 behavior - bona fide property |
| return this.modifierFlags; |
| } else { |
| // 3.0 behavior - convenient method |
| // performance could be improved by caching computed flags |
| // but this would require tracking changes to this.modifiers |
| int flags = Modifier.NONE; |
| for (Iterator it = modifiers().iterator(); it.hasNext(); ) { |
| Object x = it.next(); |
| if (x instanceof Modifier) { |
| flags |= ((Modifier) x).getKeyword().toFlagValue(); |
| } |
| } |
| return flags; |
| } |
| } |
| |
| /** |
| * Sets the modifiers explicitly specified on this declaration (2.0 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 2.0 |
| * @see Modifier |
| * TBD (jeem ) - deprecated In the 3.0 API, this method is replaced by |
| * <code>modifiers()</code> which contains a list of |
| * a <code>Modifier</code> nodes. |
| */ |
| public void setModifiers(int modifiers) { |
| supportedOnlyIn2(); |
| modifying(); |
| this.modifierFlags = modifiers; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on VariableDeclaration. |
| */ |
| public SimpleName getName() { |
| if (this.variableName == null) { |
| // lazy initialize - use setter to ensure parent link set too |
| long count = getAST().modificationCount(); |
| setName(new SimpleName(getAST())); |
| getAST().setModificationCount(count); |
| } |
| return this.variableName; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on VariableDeclaration. |
| */ |
| public void setName(SimpleName variableName) { |
| if (variableName == null) { |
| throw new IllegalArgumentException(); |
| } |
| replaceChild(this.variableName, variableName, false); |
| this.variableName = variableName; |
| } |
| |
| /** |
| * 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 initialize - use setter to ensure parent link set too |
| long count = getAST().modificationCount(); |
| setType(getAST().newPrimitiveType(PrimitiveType.INT)); |
| getAST().setModificationCount(count); |
| } |
| return this.type; |
| } |
| |
| /** |
| * Returns whether this declaration declares the last parameter of |
| * a variable arity method (added in 3.0 API). |
| * <p> |
| * Note: Varible arity methods are an experimental language feature |
| * under discussion in JSR-201 and under consideration for inclusion |
| * in the 1.5 release of J2SE. The support here is therefore tentative |
| * and subject to change. |
| * </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 2.0 AST |
| * @since 3.0 |
| */ |
| public boolean isVariableArity() { |
| // 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 3.0 API). |
| * <p> |
| * Note: Varible arity methods are an experimental language feature |
| * under discussion in JSR-201 and under consideration for inclusion |
| * in the 1.5 release of J2SE. The support here is therefore tentative |
| * and subject to change. |
| * </p> |
| * |
| * @param variableArity <code>true</code> if this is a variable arity |
| * parameter declaration, and <code>false</code> otherwise |
| * @since 3.0 |
| */ |
| public void setVariableArity(boolean variableArity) { |
| // more efficient than just calling unsupportedIn2() to check |
| if (this.modifiers == null) { |
| unsupportedIn2(); |
| } |
| modifying(); |
| this.variableArity = variableArity; |
| } |
| |
| /** |
| * 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(); |
| } |
| replaceChild(this.type, type, false); |
| this.type = type; |
| } |
| |
| /* (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(); |
| } |
| modifying(); |
| this.extraArrayDimensions = dimensions; |
| } |
| |
| /* (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 |
| replaceChild(this.optionalInitializer, initializer, true); |
| this.optionalInitializer = initializer; |
| } |
| |
| /* (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()); |
| } |
| } |