001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel; 019 020/** 021 * Exception constants. 022 * @since 6.0 (intended to replace the InstructionConstant interface) 023 */ 024public final class ExceptionConst { 025 026 /** 027 * The mother of all exceptions 028 */ 029 public static final Class<Throwable> THROWABLE = Throwable.class; 030 031 /** 032 * Super class of any run-time exception 033 */ 034 public static final Class<RuntimeException> RUNTIME_EXCEPTION = RuntimeException.class; 035 036 /** 037 * Super class of any linking exception (aka Linkage Error) 038 */ 039 public static final Class<LinkageError> LINKING_EXCEPTION = LinkageError.class; 040 041 /** 042 * Linking Exceptions 043 */ 044 public static final Class<ClassCircularityError> CLASS_CIRCULARITY_ERROR = ClassCircularityError.class; 045 public static final Class<ClassFormatError> CLASS_FORMAT_ERROR = ClassFormatError.class; 046 public static final Class<ExceptionInInitializerError> EXCEPTION_IN_INITIALIZER_ERROR = ExceptionInInitializerError.class; 047 public static final Class<IncompatibleClassChangeError> INCOMPATIBLE_CLASS_CHANGE_ERROR = IncompatibleClassChangeError.class; 048 public static final Class<AbstractMethodError> ABSTRACT_METHOD_ERROR = AbstractMethodError.class; 049 public static final Class<IllegalAccessError> ILLEGAL_ACCESS_ERROR = IllegalAccessError.class; 050 public static final Class<InstantiationError> INSTANTIATION_ERROR = InstantiationError.class; 051 public static final Class<NoSuchFieldError> NO_SUCH_FIELD_ERROR = NoSuchFieldError.class; 052 public static final Class<NoSuchMethodError> NO_SUCH_METHOD_ERROR = NoSuchMethodError.class; 053 public static final Class<NoClassDefFoundError> NO_CLASS_DEF_FOUND_ERROR = NoClassDefFoundError.class; 054 public static final Class<UnsatisfiedLinkError> UNSATISFIED_LINK_ERROR = UnsatisfiedLinkError.class; 055 public static final Class<VerifyError> VERIFY_ERROR = VerifyError.class; 056 /* UnsupportedClassVersionError is new in JDK 1.2 */ 057// public static final Class UnsupportedClassVersionError = UnsupportedClassVersionError.class; 058 059 /** 060 * Run-Time Exceptions 061 */ 062 public static final Class<NullPointerException> NULL_POINTER_EXCEPTION = NullPointerException.class; 063 public static final Class<ArrayIndexOutOfBoundsException> ARRAY_INDEX_OUT_OF_BOUNDS_EXCEPTION 064 = ArrayIndexOutOfBoundsException.class; 065 public static final Class<ArithmeticException> ARITHMETIC_EXCEPTION = ArithmeticException.class; 066 public static final Class<NegativeArraySizeException> NEGATIVE_ARRAY_SIZE_EXCEPTION = NegativeArraySizeException.class; 067 public static final Class<ClassCastException> CLASS_CAST_EXCEPTION = ClassCastException.class; 068 public static final Class<IllegalMonitorStateException> ILLEGAL_MONITOR_STATE = IllegalMonitorStateException.class; 069 070 /** 071 * Pre-defined exception arrays according to chapters 5.1-5.4 of the Java Virtual 072 * Machine Specification 073 */ 074 private static final Class<?>[] EXCS_CLASS_AND_INTERFACE_RESOLUTION = { 075 NO_CLASS_DEF_FOUND_ERROR, CLASS_FORMAT_ERROR, VERIFY_ERROR, ABSTRACT_METHOD_ERROR, 076 EXCEPTION_IN_INITIALIZER_ERROR, ILLEGAL_ACCESS_ERROR 077 }; // Chapter 5.1 078 private static final Class<?>[] EXCS_FIELD_AND_METHOD_RESOLUTION = { 079 NO_SUCH_FIELD_ERROR, ILLEGAL_ACCESS_ERROR, NO_SUCH_METHOD_ERROR 080 }; // Chapter 5.2 081 private static final Class<?>[] EXCS_INTERFACE_METHOD_RESOLUTION = new Class[0]; // Chapter 5.3 (as below) 082 private static final Class<?>[] EXCS_STRING_RESOLUTION = new Class[0]; 083 // Chapter 5.4 (no errors but the ones that _always_ could happen! How stupid.) 084 private static final Class<?>[] EXCS_ARRAY_EXCEPTION = { 085 NULL_POINTER_EXCEPTION, ARRAY_INDEX_OUT_OF_BOUNDS_EXCEPTION 086 }; 087 088 /** 089 * Enum corresponding to the various Exception Class arrays, 090 * used by {@link ExceptionConst#createExceptions(EXCS, Class...)} 091 */ 092 public enum EXCS { 093 EXCS_CLASS_AND_INTERFACE_RESOLUTION, 094 EXCS_FIELD_AND_METHOD_RESOLUTION, 095 EXCS_INTERFACE_METHOD_RESOLUTION, 096 EXCS_STRING_RESOLUTION, 097 EXCS_ARRAY_EXCEPTION, 098 } 099 100 // helper method to merge exception class arrays 101 private static Class<?>[] mergeExceptions(final Class<?>[] input, final Class<?> ... extraClasses) { 102 final int extraLen = extraClasses == null ? 0 : extraClasses.length; 103 final Class<?>[] excs = new Class<?>[input.length + extraLen]; 104 System.arraycopy(input, 0, excs, 0, input.length); 105 if (extraLen > 0) { 106 System.arraycopy(extraClasses, 0, excs, input.length, extraLen); 107 } 108 return excs; 109 } 110 111 /** 112 * Creates a copy of the specified Exception Class array combined with any additional Exception classes. 113 * @param type the basic array type 114 * @param extraClasses additional classes, if any 115 * @return the merged array 116 */ 117 public static Class<?>[] createExceptions(final EXCS type, final Class<?> ... extraClasses) { 118 switch (type) { 119 case EXCS_CLASS_AND_INTERFACE_RESOLUTION: 120 return mergeExceptions(EXCS_CLASS_AND_INTERFACE_RESOLUTION, extraClasses); 121 case EXCS_ARRAY_EXCEPTION: 122 return mergeExceptions(EXCS_ARRAY_EXCEPTION, extraClasses); 123 case EXCS_FIELD_AND_METHOD_RESOLUTION: 124 return mergeExceptions(EXCS_FIELD_AND_METHOD_RESOLUTION, extraClasses); 125 case EXCS_INTERFACE_METHOD_RESOLUTION: 126 return mergeExceptions(EXCS_INTERFACE_METHOD_RESOLUTION, extraClasses); 127 case EXCS_STRING_RESOLUTION: 128 return mergeExceptions(EXCS_STRING_RESOLUTION, extraClasses); 129 default: 130 throw new AssertionError("Cannot happen; unexpected enum value: " + type); 131 } 132 } 133 134 135}