| /* |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * ASM: a very small and fast Java bytecode manipulation framework |
| * Copyright (c) 2000-2013 INRIA, France Telecom |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.internal.org.objectweb.asm; |
| |
| /** |
| * The path to a type argument, wildcard bound, array element type, or static |
| * inner type within an enclosing type. |
| * |
| * @author Eric Bruneton |
| */ |
| public class TypePath { |
| |
| /** |
| * A type path step that steps into the element type of an array type. See |
| * {@link #getStep getStep}. |
| */ |
| public final static int ARRAY_ELEMENT = 0; |
| |
| /** |
| * A type path step that steps into the nested type of a class type. See |
| * {@link #getStep getStep}. |
| */ |
| public final static int INNER_TYPE = 1; |
| |
| /** |
| * A type path step that steps into the bound of a wildcard type. See |
| * {@link #getStep getStep}. |
| */ |
| public final static int WILDCARD_BOUND = 2; |
| |
| /** |
| * A type path step that steps into a type argument of a generic type. See |
| * {@link #getStep getStep}. |
| */ |
| public final static int TYPE_ARGUMENT = 3; |
| |
| /** |
| * The byte array where the path is stored, in Java class file format. |
| */ |
| byte[] b; |
| |
| /** |
| * The offset of the first byte of the type path in 'b'. |
| */ |
| int offset; |
| |
| /** |
| * Creates a new type path. |
| * |
| * @param b |
| * the byte array containing the type path in Java class file |
| * format. |
| * @param offset |
| * the offset of the first byte of the type path in 'b'. |
| */ |
| TypePath(byte[] b, int offset) { |
| this.b = b; |
| this.offset = offset; |
| } |
| |
| /** |
| * Returns the length of this path. |
| * |
| * @return the length of this path. |
| */ |
| public int getLength() { |
| return b[offset]; |
| } |
| |
| /** |
| * Returns the value of the given step of this path. |
| * |
| * @param index |
| * an index between 0 and {@link #getLength()}, exclusive. |
| * @return {@link #ARRAY_ELEMENT ARRAY_ELEMENT}, {@link #INNER_TYPE |
| * INNER_TYPE}, {@link #WILDCARD_BOUND WILDCARD_BOUND}, or |
| * {@link #TYPE_ARGUMENT TYPE_ARGUMENT}. |
| */ |
| public int getStep(int index) { |
| return b[offset + 2 * index + 1]; |
| } |
| |
| /** |
| * Returns the index of the type argument that the given step is stepping |
| * into. This method should only be used for steps whose value is |
| * {@link #TYPE_ARGUMENT TYPE_ARGUMENT}. |
| * |
| * @param index |
| * an index between 0 and {@link #getLength()}, exclusive. |
| * @return the index of the type argument that the given step is stepping |
| * into. |
| */ |
| public int getStepArgument(int index) { |
| return b[offset + 2 * index + 2]; |
| } |
| |
| /** |
| * Converts a type path in string form, in the format used by |
| * {@link #toString()}, into a TypePath object. |
| * |
| * @param typePath |
| * a type path in string form, in the format used by |
| * {@link #toString()}. May be null or empty. |
| * @return the corresponding TypePath object, or null if the path is empty. |
| */ |
| public static TypePath fromString(final String typePath) { |
| if (typePath == null || typePath.length() == 0) { |
| return null; |
| } |
| int n = typePath.length(); |
| ByteVector out = new ByteVector(n); |
| out.putByte(0); |
| for (int i = 0; i < n;) { |
| char c = typePath.charAt(i++); |
| if (c == '[') { |
| out.put11(ARRAY_ELEMENT, 0); |
| } else if (c == '.') { |
| out.put11(INNER_TYPE, 0); |
| } else if (c == '*') { |
| out.put11(WILDCARD_BOUND, 0); |
| } else if (c >= '0' && c <= '9') { |
| int typeArg = c - '0'; |
| while (i < n && (c = typePath.charAt(i)) >= '0' && c <= '9') { |
| typeArg = typeArg * 10 + c - '0'; |
| i += 1; |
| } |
| if (i < n && typePath.charAt(i) == ';') { |
| i += 1; |
| } |
| out.put11(TYPE_ARGUMENT, typeArg); |
| } |
| } |
| out.data[0] = (byte) (out.length / 2); |
| return new TypePath(out.data, 0); |
| } |
| |
| /** |
| * Returns a string representation of this type path. {@link #ARRAY_ELEMENT |
| * ARRAY_ELEMENT} steps are represented with '[', {@link #INNER_TYPE |
| * INNER_TYPE} steps with '.', {@link #WILDCARD_BOUND WILDCARD_BOUND} steps |
| * with '*' and {@link #TYPE_ARGUMENT TYPE_ARGUMENT} steps with their type |
| * argument index in decimal form followed by ';'. |
| */ |
| @Override |
| public String toString() { |
| int length = getLength(); |
| StringBuilder result = new StringBuilder(length * 2); |
| for (int i = 0; i < length; ++i) { |
| switch (getStep(i)) { |
| case ARRAY_ELEMENT: |
| result.append('['); |
| break; |
| case INNER_TYPE: |
| result.append('.'); |
| break; |
| case WILDCARD_BOUND: |
| result.append('*'); |
| break; |
| case TYPE_ARGUMENT: |
| result.append(getStepArgument(i)).append(';'); |
| break; |
| default: |
| result.append('_'); |
| } |
| } |
| return result.toString(); |
| } |
| } |