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