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