| 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 | * Cast expression AST node type. |
| 22 | * |
| 23 | * <pre> |
| 24 | * CastExpression: |
| 25 | * <b>(</b> Type <b>)</b> Expression |
| 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 CastExpression extends Expression { |
| 33 | |
| 34 | /** |
| 35 | * The "type" structural property of this node type (child type: {@link Type}). |
| 36 | * @since 3.0 |
| 37 | */ |
| 38 | public static final ChildPropertyDescriptor TYPE_PROPERTY = |
| 39 | new ChildPropertyDescriptor(CastExpression.class, "type", Type.class, MANDATORY, NO_CYCLE_RISK); //$NON-NLS-1$ |
| 40 | |
| 41 | /** |
| 42 | * The "expression" structural property of this node type (child type: {@link Expression}). |
| 43 | * @since 3.0 |
| 44 | */ |
| 45 | public static final ChildPropertyDescriptor EXPRESSION_PROPERTY = |
| 46 | new ChildPropertyDescriptor(CastExpression.class, "expression", Expression.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 properyList = new ArrayList(3); |
| 57 | createPropertyList(CastExpression.class, properyList); |
| 58 | addProperty(TYPE_PROPERTY, properyList); |
| 59 | addProperty(EXPRESSION_PROPERTY, properyList); |
| 60 | PROPERTY_DESCRIPTORS = reapPropertyList(properyList); |
| 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 | * @return a list of property descriptors (element type: |
| 70 | * {@link StructuralPropertyDescriptor}) |
| 71 | * @since 3.0 |
| 72 | */ |
| 73 | public static List propertyDescriptors(int apiLevel) { |
| 74 | return PROPERTY_DESCRIPTORS; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * The type; lazily initialized; defaults to a unspecified, |
| 79 | * legal type. |
| 80 | */ |
| 81 | private Type type = null; |
| 82 | |
| 83 | /** |
| 84 | * The expression; lazily initialized; defaults to a unspecified, but legal, |
| 85 | * expression. |
| 86 | */ |
| 87 | private Expression expression = null; |
| 88 | |
| 89 | /** |
| 90 | * Creates a new AST node for a cast expression owned by the given |
| 91 | * AST. By default, the type and expression are unspecified (but legal). |
| 92 | * <p> |
| 93 | * N.B. This constructor is package-private. |
| 94 | * </p> |
| 95 | * |
| 96 | * @param ast the AST that is to own this node |
| 97 | */ |
| 98 | CastExpression(AST ast) { |
| 99 | super(ast); |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | final List internalStructuralPropertiesForType(int apiLevel) { |
| 104 | return propertyDescriptors(apiLevel); |
| 105 | } |
| 106 | |
| 107 | @Override |
| 108 | final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) { |
| 109 | if (property == EXPRESSION_PROPERTY) { |
| 110 | if (get) { |
| 111 | return getExpression(); |
| 112 | } else { |
| 113 | setExpression((Expression) child); |
| 114 | return null; |
| 115 | } |
| 116 | } |
| 117 | if (property == TYPE_PROPERTY) { |
| 118 | if (get) { |
| 119 | return getType(); |
| 120 | } else { |
| 121 | setType((Type) child); |
| 122 | return null; |
| 123 | } |
| 124 | } |
| 125 | // allow default implementation to flag the error |
| 126 | return super.internalGetSetChildProperty(property, get, child); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | final int getNodeType0() { |
| 131 | return CAST_EXPRESSION; |
| 132 | } |
| 133 | |
| 134 | @Override |
| 135 | ASTNode clone0(AST target) { |
| 136 | CastExpression result = new CastExpression(target); |
| 137 | result.setSourceRange(getStartPosition(), getLength()); |
| 138 | result.setType((Type) getType().clone(target)); |
| 139 | result.setExpression((Expression) getExpression().clone(target)); |
| 140 | return result; |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | final boolean subtreeMatch0(ASTMatcher matcher, Object other) { |
| 145 | // dispatch to correct overloaded match method |
| 146 | return matcher.match(this, other); |
| 147 | } |
| 148 | |
| 149 | @Override |
| 150 | void accept0(ASTVisitor visitor) { |
| 151 | boolean visitChildren = visitor.visit(this); |
| 152 | if (visitChildren) { |
| 153 | // visit children in normal left to right reading order |
| 154 | acceptChild(visitor, getType()); |
| 155 | acceptChild(visitor, getExpression()); |
| 156 | } |
| 157 | visitor.endVisit(this); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Returns the type in this cast expression. |
| 162 | * |
| 163 | * @return the type |
| 164 | */ |
| 165 | public Type getType() { |
| 166 | if (this.type == null) { |
| 167 | // lazy init must be thread-safe for readers |
| 168 | synchronized (this) { |
| 169 | if (this.type == null) { |
| 170 | preLazyInit(); |
| 171 | this.type = this.ast.newPrimitiveType(PrimitiveType.INT); |
| 172 | postLazyInit(this.type, TYPE_PROPERTY); |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | return this.type; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Sets the type in this cast expression to the given type. |
| 181 | * |
| 182 | * @param type the new type |
| 183 | * @exception IllegalArgumentException if: |
| 184 | * <ul> |
| 185 | * <li>the node belongs to a different AST</li> |
| 186 | * <li>the node already has a parent</li> |
| 187 | * </ul> |
| 188 | */ |
| 189 | public void setType(Type type) { |
| 190 | if (type == null) { |
| 191 | throw new IllegalArgumentException(); |
| 192 | } |
| 193 | ASTNode oldChild = this.type; |
| 194 | preReplaceChild(oldChild, type, TYPE_PROPERTY); |
| 195 | this.type = type; |
| 196 | postReplaceChild(oldChild, type, TYPE_PROPERTY); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Returns the expression of this cast expression. |
| 201 | * |
| 202 | * @return the expression node |
| 203 | */ |
| 204 | public Expression getExpression() { |
| 205 | if (this.expression == null) { |
| 206 | // lazy init must be thread-safe for readers |
| 207 | synchronized (this) { |
| 208 | if (this.expression == null) { |
| 209 | preLazyInit(); |
| 210 | this.expression = new SimpleName(this.ast); |
| 211 | postLazyInit(this.expression, EXPRESSION_PROPERTY); |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | return this.expression; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Sets the expression of this cast expression. |
| 220 | * |
| 221 | * @param expression the new expression node |
| 222 | * @exception IllegalArgumentException if: |
| 223 | * <ul> |
| 224 | * <li>the node belongs to a different AST</li> |
| 225 | * <li>the node already has a parent</li> |
| 226 | * <li>a cycle in would be created</li> |
| 227 | * </ul> |
| 228 | */ |
| 229 | public void setExpression(Expression expression) { |
| 230 | if (expression == null) { |
| 231 | throw new IllegalArgumentException(); |
| 232 | } |
| 233 | ASTNode oldChild = this.expression; |
| 234 | preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| 235 | this.expression = expression; |
| 236 | postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY); |
| 237 | } |
| 238 | |
| 239 | @Override |
| 240 | int memSize() { |
| 241 | // treat Code as free |
| 242 | return BASE_NODE_SIZE + 2 * 4; |
| 243 | } |
| 244 | |
| 245 | @Override |
| 246 | int treeSize() { |
| 247 | return |
| 248 | memSize() |
| 249 | + (this.expression == null ? 0 : getExpression().treeSize()) |
| 250 | + (this.type == null ? 0 : getType().treeSize()); |
| 251 | } |
| 252 | } |
| 253 |
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