1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel; 19 20 /** 21 * Exception constants. 22 * @since 6.0 (intended to replace the InstructionConstant interface) 23 */ 24 public final class ExceptionConst { 25 26 /** The mother of all exceptions 27 */ 28 public static final Class<Throwable> THROWABLE = Throwable.class; 29 /** Super class of any run-time exception 30 */ 31 public static final Class<RuntimeException> RUNTIME_EXCEPTION = RuntimeException.class; 32 /** Super class of any linking exception (aka Linkage Error) 33 */ 34 public static final Class<LinkageError> LINKING_EXCEPTION = LinkageError.class; 35 /** Linking Exceptions 36 */ 37 public static final Class<ClassCircularityError> CLASS_CIRCULARITY_ERROR = ClassCircularityError.class; 38 public static final Class<ClassFormatError> CLASS_FORMAT_ERROR = ClassFormatError.class; 39 public static final Class<ExceptionInInitializerError> EXCEPTION_IN_INITIALIZER_ERROR = ExceptionInInitializerError.class; 40 public static final Class<IncompatibleClassChangeError> INCOMPATIBLE_CLASS_CHANGE_ERROR = IncompatibleClassChangeError.class; 41 public static final Class<AbstractMethodError> ABSTRACT_METHOD_ERROR = AbstractMethodError.class; 42 public static final Class<IllegalAccessError> ILLEGAL_ACCESS_ERROR = IllegalAccessError.class; 43 public static final Class<InstantiationError> INSTANTIATION_ERROR = InstantiationError.class; 44 public static final Class<NoSuchFieldError> NO_SUCH_FIELD_ERROR = NoSuchFieldError.class; 45 public static final Class<NoSuchMethodError> NO_SUCH_METHOD_ERROR = NoSuchMethodError.class; 46 public static final Class<NoClassDefFoundError> NO_CLASS_DEF_FOUND_ERROR = NoClassDefFoundError.class; 47 public static final Class<UnsatisfiedLinkError> UNSATISFIED_LINK_ERROR = UnsatisfiedLinkError.class; 48 public static final Class<VerifyError> VERIFY_ERROR = VerifyError.class; 49 /* UnsupportedClassVersionError is new in JDK 1.2 */ 50 // public static final Class UnsupportedClassVersionError = UnsupportedClassVersionError.class; 51 /** Run-Time Exceptions 52 */ 53 public static final Class<NullPointerException> NULL_POINTER_EXCEPTION = NullPointerException.class; 54 public static final Class<ArrayIndexOutOfBoundsException> ARRAY_INDEX_OUT_OF_BOUNDS_EXCEPTION 55 = ArrayIndexOutOfBoundsException.class; 56 public static final Class<ArithmeticException> ARITHMETIC_EXCEPTION = ArithmeticException.class; 57 public static final Class<NegativeArraySizeException> NEGATIVE_ARRAY_SIZE_EXCEPTION = NegativeArraySizeException.class; 58 public static final Class<ClassCastException> CLASS_CAST_EXCEPTION = ClassCastException.class; 59 public static final Class<IllegalMonitorStateException> ILLEGAL_MONITOR_STATE = IllegalMonitorStateException.class; 60 61 /** 62 * Pre-defined exception arrays according to chapters 5.1-5.4 of the Java Virtual 63 * Machine Specification 64 */ 65 private static final Class<?>[] EXCS_CLASS_AND_INTERFACE_RESOLUTION = { 66 NO_CLASS_DEF_FOUND_ERROR, CLASS_FORMAT_ERROR, VERIFY_ERROR, ABSTRACT_METHOD_ERROR, 67 EXCEPTION_IN_INITIALIZER_ERROR, ILLEGAL_ACCESS_ERROR 68 }; // Chapter 5.1 69 private static final Class<?>[] EXCS_FIELD_AND_METHOD_RESOLUTION = { 70 NO_SUCH_FIELD_ERROR, ILLEGAL_ACCESS_ERROR, NO_SUCH_METHOD_ERROR 71 }; // Chapter 5.2 72 private static final Class<?>[] EXCS_INTERFACE_METHOD_RESOLUTION = new Class[0]; // Chapter 5.3 (as below) 73 private static final Class<?>[] EXCS_STRING_RESOLUTION = new Class[0]; 74 // Chapter 5.4 (no errors but the ones that _always_ could happen! How stupid.) 75 private static final Class<?>[] EXCS_ARRAY_EXCEPTION = { 76 NULL_POINTER_EXCEPTION, ARRAY_INDEX_OUT_OF_BOUNDS_EXCEPTION 77 }; 78 79 /** 80 * Enum corresponding to the various Exception Class arrays, 81 * used by {@link ExceptionConst#createExceptions(EXCS, Class...)} 82 */ 83 public enum EXCS { 84 EXCS_CLASS_AND_INTERFACE_RESOLUTION, 85 EXCS_FIELD_AND_METHOD_RESOLUTION, 86 EXCS_INTERFACE_METHOD_RESOLUTION, 87 EXCS_STRING_RESOLUTION, 88 EXCS_ARRAY_EXCEPTION, 89 } 90 91 // helper method to merge exception class arrays mergeExceptions(final Class<?>[] input, final Class<?> ... extraClasses)92 private static Class<?>[] mergeExceptions(final Class<?>[] input, final Class<?> ... extraClasses) { 93 final int extraLen = extraClasses == null ? 0 : extraClasses.length; 94 final Class<?>[] excs = new Class<?>[input.length + extraLen]; 95 System.arraycopy(input, 0, excs, 0, input.length); 96 if (extraLen > 0) { 97 System.arraycopy(extraClasses, 0, excs, input.length, extraLen); 98 } 99 return excs; 100 } 101 102 /** 103 * Creates a copy of the specified Exception Class array combined with any additional Exception classes. 104 * @param type the basic array type 105 * @param extraClasses additional classes, if any 106 * @return the merged array 107 */ createExceptions(final EXCS type, final Class<?> ... extraClasses)108 public static Class<?>[] createExceptions(final EXCS type, final Class<?> ... extraClasses) { 109 switch (type) { 110 case EXCS_CLASS_AND_INTERFACE_RESOLUTION: 111 return mergeExceptions(EXCS_CLASS_AND_INTERFACE_RESOLUTION, extraClasses); 112 case EXCS_ARRAY_EXCEPTION: 113 return mergeExceptions(EXCS_ARRAY_EXCEPTION, extraClasses); 114 case EXCS_FIELD_AND_METHOD_RESOLUTION: 115 return mergeExceptions(EXCS_FIELD_AND_METHOD_RESOLUTION, extraClasses); 116 case EXCS_INTERFACE_METHOD_RESOLUTION: 117 return mergeExceptions(EXCS_INTERFACE_METHOD_RESOLUTION, extraClasses); 118 case EXCS_STRING_RESOLUTION: 119 return mergeExceptions(EXCS_STRING_RESOLUTION, extraClasses); 120 default: 121 throw new AssertionError("Cannot happen; unexpected enum value: " + type); 122 } 123 } 124 125 126 } 127