| 1 | /******************************************************************************* |
|---|---|
| 2 | * Copyright (c) 2000, 2013 IBM Corporation and others. |
| 3 | * |
| 4 | * This program and the accompanying materials |
| 5 | * are made available under the terms of the Eclipse Public License 2.0 |
| 6 | * which accompanies this distribution, and is available at |
| 7 | * https://www.eclipse.org/legal/epl-2.0/ |
| 8 | * |
| 9 | * SPDX-License-Identifier: EPL-2.0 |
| 10 | * |
| 11 | * Contributors: |
| 12 | * IBM Corporation - initial API and implementation |
| 13 | *******************************************************************************/ |
| 14 | |
| 15 | package org.eclipse.jdt.core.dom; |
| 16 | |
| 17 | import java.util.ArrayList; |
| 18 | import java.util.List; |
| 19 | |
| 20 | /** |
| 21 | * While statement AST node type. |
| 22 | * |
| 23 | * <pre> |
| 24 | * WhileStatement: |
| 25 | * <b>while</b> <b>(</b> Expression <b>)</b> Statement |
| 26 | * </pre> |
| 27 | * |
| 28 | * @since 2.0 |
| 29 | * @noinstantiate This class is not intended to be instantiated by clients. |
| 30 | */ |
| 31 | @SuppressWarnings("rawtypes") |
| 32 | public class WhileStatement extends Statement { |
| 33 | |
| 34 | /** |
| 35 | * The "expression" structural property of this node type (child type: {@link Expression}). |
| 36 | * @since 3.0 |
| 37 | */ |
| 38 | public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| 39 | new ChildPropertyDescriptor(WhileStatement.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| 40 | |
| 41 | /** |
| 42 | * The "body" structural property of this node type (child type: {@link Statement}). |
| 43 | * @since 3.0 |
| 44 | */ |
| 45 | public static final ChildPropertyDescriptor BODY_PROPERTY = |
| 46 | new ChildPropertyDescriptor(WhileStatement.class, "body", Statement.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$ |
| 47 | |
| 48 | /** |
| 49 | * A list of property descriptors (element type: |
| 50 | * {@link StructuralPropertyDescriptor}), |
| 51 | * or null if uninitialized. |
| 52 | */ |
| 53 | private static final List PROPERTY_DESCRIPTORS; |
| 54 | |
| 55 | static { |
| 56 | List propertyList = new ArrayList(3); |
| 57 | createPropertyList(WhileStatement.class, propertyList); |
| 58 | addProperty(EXPRESSION_PROPERTY, propertyList); |
| 59 | addProperty(BODY_PROPERTY, propertyList); |
| 60 | PROPERTY_DESCRIPTORS = reapPropertyList(propertyList); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Returns a list of structural property descriptors for this node type. |
| 65 | * Clients must not modify the result. |
| 66 | * |
| 67 | * @param apiLevel the API level; one of the |
| 68 | * <code>AST.JLS*</code> constants |
| 69 | |
| 70 | * @return a list of property descriptors (element type: |
| 71 | * {@link StructuralPropertyDescriptor}) |
| 72 | * @since 3.0 |
| 73 | */ |
| 74 | public static List propertyDescriptors(int apiLevel) { |
| 75 | return PROPERTY_DESCRIPTORS; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * The expression; lazily initialized; defaults to an unspecified, but |
| 80 | * legal, expression. |
| 81 | */ |
| 82 | private Expression expression = null; |
| 83 | |
| 84 | /** |
| 85 | * The body statement; lazily initialized; defaults to an empty block |
| 86 | * statement. |
| 87 | */ |
| 88 | private Statement body = null; |
| 89 | |
| 90 | /** |
| 91 | * Creates a new unparented while statement node owned by the given |
| 92 | * AST. By default, the expresssion is unspecified, but legal, and |
| 93 | * the body statement is an empty block. |
| 94 | * <p> |
| 95 | * N.B. This constructor is package-private. |
| 96 | * </p> |
| 97 | * |
| 98 | * @param ast the AST that is to own this node |
| 99 | */ |
| 100 | WhileStatement(AST ast) { |
| 101 | super(ast); |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | final List internalStructuralPropertiesForType(int apiLevel) { |
| 106 | return propertyDescriptors(apiLevel); |
| 107 | } |
| 108 | |
| 109 | @Override |
| 110 | final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { |
| 111 | if (property == EXPRESSION_PROPERTY) { |
| 112 | if (get) { |
| 113 | return getExpression(); |
| 114 | } else { |
| 115 | setExpression((Expression) child); |
| 116 | return null; |
| 117 | } |
| 118 | } |
| 119 | if (property == BODY_PROPERTY) { |
| 120 | if (get) { |
| 121 | return getBody(); |
| 122 | } else { |
| 123 | setBody((Statement) child); |
| 124 | return null; |
| 125 | } |
| 126 | } |
| 127 | // allow default implementation to flag the error |
| 128 | return super.internalGetSetChildProperty(property, get, child); |
| 129 | } |
| 130 | |
| 131 | @Override |
| 132 | final int getNodeType0() { |
| 133 | return WHILE_STATEMENT; |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | ASTNode clone0(AST target) { |
| 138 | WhileStatement result = new WhileStatement(target); |
| 139 | result.setSourceRange(getStartPosition(), getLength()); |
| 140 | result.copyLeadingComment(this); |
| 141 | result.setExpression((Expression) getExpression().clone(target)); |
| 142 | result.setBody((Statement) getBody().clone(target)); |
| 143 | return result; |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | final boolean subtreeMatch0(ASTMatcher matcher, Object other) { |
| 148 | // dispatch to correct overloaded match method |
| 149 | return matcher.match(this, other); |
| 150 | } |
| 151 | |
| 152 | @Override |
| 153 | void accept0(ASTVisitor visitor) { |
| 154 | boolean visitChildren = visitor.visit(this); |
| 155 | if (visitChildren) { |
| 156 | // visit children in normal left to right reading order |
| 157 | acceptChild(visitor, getExpression()); |
| 158 | acceptChild(visitor, getBody()); |
| 159 | } |
| 160 | visitor.endVisit(this); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Returns the expression of this while statement. |
| 165 | * |
| 166 | * @return the expression node |
| 167 | */ |
| 168 | public Expression getExpression() { |
| 169 | if (this.expression == null) { |
| 170 | // lazy init must be thread-safe for readers |
| 171 | synchronized (this) { |
| 172 | if (this.expression == null) { |
| 173 | preLazyInit(); |
| 174 | this.expression = new SimpleName(this.ast); |
| 175 | postLazyInit(this.expression, EXPRESSION_PROPERTY); |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | return this.expression; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Sets the expression of this while statement. |
| 184 | * |
| 185 | * @param expression the expression node |
| 186 | * @exception IllegalArgumentException if: |
| 187 | * <ul> |
| 188 | * <li>the node belongs to a different AST</li> |
| 189 | * <li>the node already has a parent</li> |
| 190 | * <li>a cycle in would be created</li> |
| 191 | * </ul> |
| 192 | */ |
| 193 | public void setExpression(Expression expression) { |
| 194 | if (expression == null) { |
| 195 | throw new IllegalArgumentException(); |
| 196 | } |
| 197 | ASTNode oldChild = this.expression; |
| 198 | preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| 199 | this.expression = expression; |
| 200 | postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Returns the body of this while statement. |
| 205 | * |
| 206 | * @return the body statement node |
| 207 | */ |
| 208 | public Statement getBody() { |
| 209 | if (this.body == null) { |
| 210 | // lazy init must be thread-safe for readers |
| 211 | synchronized (this) { |
| 212 | if (this.body == null) { |
| 213 | preLazyInit(); |
| 214 | this.body = new Block(this.ast); |
| 215 | postLazyInit(this.body, BODY_PROPERTY); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | return this.body; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Sets the body of this while statement. |
| 224 | * <p> |
| 225 | * Special note: The Java language does not allow a local variable declaration |
| 226 | * to appear as the body of a while statement (they may only appear within a |
| 227 | * block). However, the AST will allow a <code>VariableDeclarationStatement</code> |
| 228 | * as the body of a <code>WhileStatement</code>. To get something that will |
| 229 | * compile, be sure to embed the <code>VariableDeclarationStatement</code> |
| 230 | * inside a <code>Block</code>. |
| 231 | * </p> |
| 232 | * |
| 233 | * @param statement the body statement node |
| 234 | * @exception IllegalArgumentException if: |
| 235 | * <ul> |
| 236 | * <li>the node belongs to a different AST</li> |
| 237 | * <li>the node already has a parent</li> |
| 238 | * <li>a cycle in would be created</li> |
| 239 | * </ul> |
| 240 | */ |
| 241 | public void setBody(Statement statement) { |
| 242 | if (statement == null) { |
| 243 | throw new IllegalArgumentException(); |
| 244 | } |
| 245 | ASTNode oldChild = this.body; |
| 246 | preReplaceChild(oldChild, statement, BODY_PROPERTY); |
| 247 | this.body = statement; |
| 248 | postReplaceChild(oldChild, statement, BODY_PROPERTY); |
| 249 | } |
| 250 | |
| 251 | @Override |
| 252 | int memSize() { |
| 253 | return super.memSize() + 2 * 4; |
| 254 | } |
| 255 | |
| 256 | @Override |
| 257 | int treeSize() { |
| 258 | return |
| 259 | memSize() |
| 260 | + (this.expression == null ? 0 : getExpression().treeSize()) |
| 261 | + (this.body == null ? 0 : getBody().treeSize()); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 |
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