| /* |
| * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package java.lang.constant; |
| |
| import java.lang.invoke.MethodHandles; |
| |
| import static java.lang.constant.ConstantUtils.dropFirstAndLastChar; |
| import static java.lang.constant.ConstantUtils.internalToBinary; |
| import static java.util.Objects.requireNonNull; |
| |
| /** |
| * A <a href="package-summary.html#nominal">nominal descriptor</a> for a class, |
| * interface, or array type. A {@linkplain ReferenceClassDescImpl} corresponds to a |
| * {@code Constant_Class_info} entry in the constant pool of a classfile. |
| */ |
| final class ReferenceClassDescImpl implements ClassDesc { |
| private final String descriptor; |
| |
| /** |
| * Creates a {@linkplain ClassDesc} from a descriptor string for a class or |
| * interface type |
| * |
| * @param descriptor a field descriptor string for a class or interface type |
| * @throws IllegalArgumentException if the descriptor string is not a valid |
| * field descriptor string, or does not describe a class or interface type |
| * @jvms 4.3.2 Field Descriptors |
| */ |
| ReferenceClassDescImpl(String descriptor) { |
| requireNonNull(descriptor); |
| int len = ConstantUtils.skipOverFieldSignature(descriptor, 0, descriptor.length(), false); |
| if (len == 0 || len == 1 |
| || len != descriptor.length()) |
| throw new IllegalArgumentException(String.format("not a valid reference type descriptor: %s", descriptor)); |
| this.descriptor = descriptor; |
| } |
| |
| @Override |
| public String descriptorString() { |
| return descriptor; |
| } |
| |
| @Override |
| public Class<?> resolveConstantDesc(MethodHandles.Lookup lookup) |
| throws ReflectiveOperationException { |
| ClassDesc c = this; |
| int depth = ConstantUtils.arrayDepth(descriptorString()); |
| for (int i=0; i<depth; i++) |
| c = c.componentType(); |
| |
| if (c.isPrimitive()) |
| return lookup.findClass(descriptorString()); |
| else { |
| Class<?> clazz = lookup.findClass(internalToBinary(dropFirstAndLastChar(c.descriptorString()))); |
| for (int i = 0; i < depth; i++) |
| clazz = clazz.arrayType(); |
| return clazz; |
| } |
| } |
| |
| /** |
| * Returns {@code true} if this {@linkplain ReferenceClassDescImpl} is |
| * equal to another {@linkplain ReferenceClassDescImpl}. Equality is |
| * determined by the two class descriptors having equal class descriptor |
| * strings. |
| * |
| * @param o the {@code ClassDesc} to compare to this |
| * {@code ClassDesc} |
| * @return {@code true} if the specified {@code ClassDesc} |
| * is equal to this {@code ClassDesc}. |
| */ |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| ClassDesc constant = (ClassDesc) o; |
| return descriptor.equals(constant.descriptorString()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return descriptor.hashCode(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("ClassDesc[%s]", displayName()); |
| } |
| } |