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| 1 | +/** |
| 2 | + * Copyright 2013-2021 Valery Silaev (http://vsilaev.com) |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package org.apache.commons.javaflow.spi; |
| 17 | + |
| 18 | +import java.io.IOException; |
| 19 | +import java.io.InputStream; |
| 20 | +import java.util.Arrays; |
| 21 | +import java.util.Collection; |
| 22 | +import java.util.HashSet; |
| 23 | +import java.util.Set; |
| 24 | +import java.util.regex.Pattern; |
| 25 | + |
| 26 | +public final class ClassMatchStrategies { |
| 27 | + private ClassMatchStrategies() {} |
| 28 | + |
| 29 | + public static final ClassMatchStrategy MATCH_NONE = new ClassMatchStrategy() { |
| 30 | + @Override |
| 31 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 32 | + return false; |
| 33 | + } |
| 34 | + |
| 35 | + @Override |
| 36 | + public ClassMatcher bind(ResourceLoader ignore) { |
| 37 | + return ClassMatcher.MATCH_NONE; |
| 38 | + } |
| 39 | + }; |
| 40 | + |
| 41 | + public static final ClassMatchStrategy MATCH_ALL = new ClassMatchStrategy() { |
| 42 | + @Override |
| 43 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 44 | + return true; |
| 45 | + } |
| 46 | + |
| 47 | + @Override |
| 48 | + public ClassMatcher bind(ResourceLoader ignore) { |
| 49 | + return ClassMatcher.MATCH_ALL; |
| 50 | + } |
| 51 | + }; |
| 52 | + |
| 53 | + public static ClassMatchStrategy whenAll(ClassMatchStrategy... matchers) { |
| 54 | + return whenAll(Arrays.asList(matchers)); |
| 55 | + } |
| 56 | + |
| 57 | + public static ClassMatchStrategy whenAll(final Collection<? extends ClassMatchStrategy> matchers) { |
| 58 | + return new ClassMatchStrategy() { |
| 59 | + @Override |
| 60 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 61 | + for (ClassMatchStrategy m : matchers) { |
| 62 | + if (!m.matches(name, signature, superName, interfaces, loader)) { |
| 63 | + return false; |
| 64 | + } |
| 65 | + } |
| 66 | + return true; |
| 67 | + } |
| 68 | + }; |
| 69 | + } |
| 70 | + |
| 71 | + public static ClassMatchStrategy whenAny(ClassMatchStrategy... matchers) { |
| 72 | + return whenAny(Arrays.asList(matchers)); |
| 73 | + } |
| 74 | + |
| 75 | + public static ClassMatchStrategy whenAny(final Collection<? extends ClassMatchStrategy> matchers) { |
| 76 | + return new ClassMatchStrategy() { |
| 77 | + @Override |
| 78 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 79 | + for (ClassMatchStrategy m : matchers) { |
| 80 | + if (m.matches(name, signature, superName, interfaces, loader)) { |
| 81 | + return true; |
| 82 | + } |
| 83 | + } |
| 84 | + return false; |
| 85 | + } |
| 86 | + }; |
| 87 | + } |
| 88 | + |
| 89 | + public static ClassMatchStrategy negate(final ClassMatchStrategy matcher) { |
| 90 | + return new ClassMatchStrategy() { |
| 91 | + @Override |
| 92 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 93 | + return !matcher.matches(name, signature, superName, interfaces, loader); |
| 94 | + } |
| 95 | + }; |
| 96 | + } |
| 97 | + |
| 98 | + public static ClassMatchStrategy byClassName(String className, final boolean namePart) { |
| 99 | + final String cn = className(className); |
| 100 | + return new ClassMatchStrategy() { |
| 101 | + @Override |
| 102 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 103 | + return namePart && name.contains(cn) || name.equals(cn); |
| 104 | + } |
| 105 | + }; |
| 106 | + } |
| 107 | + |
| 108 | + public static ClassMatchStrategy byClassNamePattern(final String classNamePattern) { |
| 109 | + final Pattern pattern = Pattern.compile("^" + classNamePattern + "$"); |
| 110 | + return new ClassMatchStrategy() { |
| 111 | + @Override |
| 112 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 113 | + return pattern.matcher(name).matches(); |
| 114 | + } |
| 115 | + }; |
| 116 | + } |
| 117 | + |
| 118 | + public static ClassMatchStrategy bySuperClass(final ClassMatchStrategy nested) { |
| 119 | + return new ClassMatchStrategy() { |
| 120 | + @Override |
| 121 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 122 | + String cname = superName; |
| 123 | + while (null != cname && cname.length() > 0) { |
| 124 | + ClassHeaderReader chr; |
| 125 | + try { |
| 126 | + chr = getClassHeader(loader, cname); |
| 127 | + } catch (IOException ex) { |
| 128 | + throw new RuntimeException(ex); |
| 129 | + } |
| 130 | + String nextSuperName = chr.getSuperName(); |
| 131 | + if (nested.matches(cname, null, nextSuperName, chr.getInterfaces(), loader)) { |
| 132 | + return true; |
| 133 | + } |
| 134 | + cname = nextSuperName; |
| 135 | + } |
| 136 | + return false; |
| 137 | + } |
| 138 | + }; |
| 139 | + } |
| 140 | + |
| 141 | + public static ClassMatchStrategy byInterface(final ClassMatchStrategy nested) { |
| 142 | + return new ClassMatchStrategy() { |
| 143 | + @Override |
| 144 | + public boolean matches(String name, String signature, String superName, String[] interfaces, ResourceLoader loader) { |
| 145 | + if (null == interfaces || interfaces.length == 0) { |
| 146 | + return false; |
| 147 | + } |
| 148 | + Set<String> visited = new HashSet<String>(); |
| 149 | + for (String intf : interfaces) { |
| 150 | + if (matchInterface(intf, nested, visited, loader)) { |
| 151 | + return true; |
| 152 | + } |
| 153 | + } |
| 154 | + return false; |
| 155 | + } |
| 156 | + }; |
| 157 | + } |
| 158 | + |
| 159 | + private static boolean matchInterface(String intf, ClassMatchStrategy nested, Set<String> visited, ResourceLoader loader) { |
| 160 | + if (visited.contains(intf)) { |
| 161 | + return false; |
| 162 | + } |
| 163 | + ClassHeaderReader chr; |
| 164 | + try { |
| 165 | + chr = getClassHeader(loader, intf); |
| 166 | + } catch (IOException ex) { |
| 167 | + throw new RuntimeException(ex); |
| 168 | + } |
| 169 | + if (nested.matches(intf, null, chr.getSuperName(), chr.getInterfaces(), loader)) { |
| 170 | + return true; |
| 171 | + } |
| 172 | + visited.add(intf); |
| 173 | + String[] nextInterfaces = chr.getInterfaces(); |
| 174 | + for (String nextInterface : nextInterfaces) { |
| 175 | + if (matchInterface(nextInterface, nested, visited, loader)) { |
| 176 | + return true; |
| 177 | + } |
| 178 | + } |
| 179 | + return false; |
| 180 | + } |
| 181 | + |
| 182 | + private static String className(String internalClassName) { |
| 183 | + return internalClassName != null ? internalClassName.replace('.', '/') : null; |
| 184 | + } |
| 185 | + |
| 186 | + private static ClassHeaderReader getClassHeader(ResourceLoader loader, String className) throws IOException { |
| 187 | + return new ClassHeaderReader(getClassBytes(loader, className)); |
| 188 | + } |
| 189 | + |
| 190 | + private static byte[] getClassBytes(ResourceLoader loader, String className) throws IOException, SecurityException { |
| 191 | + InputStream in = loader.getResourceAsStream(className + ".class"); |
| 192 | + try { |
| 193 | + return getStreamBytes(in); |
| 194 | + } finally { |
| 195 | + if (null != in) { |
| 196 | + try { |
| 197 | + in.close(); |
| 198 | + } catch (IOException ignore) { |
| 199 | + } |
| 200 | + } |
| 201 | + } |
| 202 | + } |
| 203 | + |
| 204 | + private static byte[] getStreamBytes(InputStream stream) throws IOException { |
| 205 | + int BUFFER_SIZE = 4096; |
| 206 | + FastByteArrayOutputStream baos = new FastByteArrayOutputStream(BUFFER_SIZE); |
| 207 | + try { |
| 208 | + |
| 209 | + int bytesRead; |
| 210 | + byte[] buffer = new byte[BUFFER_SIZE]; |
| 211 | + |
| 212 | + while ((bytesRead = stream.read(buffer, 0, BUFFER_SIZE)) > 0) { |
| 213 | + baos.write(buffer, 0, bytesRead); |
| 214 | + } |
| 215 | + |
| 216 | + byte[] data = baos.unsafeBytes(); |
| 217 | + return data; |
| 218 | + |
| 219 | + } finally { |
| 220 | + baos.close(); |
| 221 | + } |
| 222 | + } |
| 223 | +} |
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