1 /*
2 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
3103 * To create such a throwing handler, compose the handler creation logic
3104 * with {@link #throwException throwException},
3105 * in order to create a method handle of the correct return type.
3106 * @param target method handle to call
3107 * @param exType the type of exception which the handler will catch
3108 * @param handler method handle to call if a matching exception is thrown
3109 * @return method handle which incorporates the specified try/catch logic
3110 * @throws NullPointerException if any argument is null
3111 * @throws IllegalArgumentException if {@code handler} does not accept
3112 * the given exception type, or if the method handle types do
3113 * not match in their return types and their
3114 * corresponding parameters
3115 * @see MethodHandles#tryFinally(MethodHandle, MethodHandle)
3116 */
3117 public static
3118 MethodHandle catchException(MethodHandle target,
3119 Class<? extends Throwable> exType,
3120 MethodHandle handler) {
3121 MethodType ttype = target.type();
3122 MethodType htype = handler.type();
3123 if (htype.parameterCount() < 1 ||
3124 !htype.parameterType(0).isAssignableFrom(exType))
3125 throw newIllegalArgumentException("handler does not accept exception type "+exType);
3126 if (htype.returnType() != ttype.returnType())
3127 throw misMatchedTypes("target and handler return types", ttype, htype);
3128 List<Class<?>> targs = ttype.parameterList();
3129 List<Class<?>> hargs = htype.parameterList();
3130 hargs = hargs.subList(1, hargs.size()); // omit leading parameter from handler
3131 if (!targs.equals(hargs)) {
3132 int hpc = hargs.size(), tpc = targs.size();
3133 if (hpc >= tpc || !targs.subList(0, hpc).equals(hargs))
3134 throw misMatchedTypes("target and handler types", ttype, htype);
3135 handler = dropArguments(handler, 1+hpc, targs.subList(hpc, tpc));
3136 htype = handler.type();
3137 }
3138 return MethodHandleImpl.makeGuardWithCatch(target, exType, handler);
3139 }
3140
3141 /**
3142 * Produces a method handle which will throw exceptions of the given {@code exType}.
|
1 /*
2 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
3103 * To create such a throwing handler, compose the handler creation logic
3104 * with {@link #throwException throwException},
3105 * in order to create a method handle of the correct return type.
3106 * @param target method handle to call
3107 * @param exType the type of exception which the handler will catch
3108 * @param handler method handle to call if a matching exception is thrown
3109 * @return method handle which incorporates the specified try/catch logic
3110 * @throws NullPointerException if any argument is null
3111 * @throws IllegalArgumentException if {@code handler} does not accept
3112 * the given exception type, or if the method handle types do
3113 * not match in their return types and their
3114 * corresponding parameters
3115 * @see MethodHandles#tryFinally(MethodHandle, MethodHandle)
3116 */
3117 public static
3118 MethodHandle catchException(MethodHandle target,
3119 Class<? extends Throwable> exType,
3120 MethodHandle handler) {
3121 MethodType ttype = target.type();
3122 MethodType htype = handler.type();
3123 if (!Throwable.class.isAssignableFrom(exType))
3124 throw new ClassCastException(exType.getName());
3125 if (htype.parameterCount() < 1 ||
3126 !htype.parameterType(0).isAssignableFrom(exType))
3127 throw newIllegalArgumentException("handler does not accept exception type "+exType);
3128 if (htype.returnType() != ttype.returnType())
3129 throw misMatchedTypes("target and handler return types", ttype, htype);
3130 List<Class<?>> targs = ttype.parameterList();
3131 List<Class<?>> hargs = htype.parameterList();
3132 hargs = hargs.subList(1, hargs.size()); // omit leading parameter from handler
3133 if (!targs.equals(hargs)) {
3134 int hpc = hargs.size(), tpc = targs.size();
3135 if (hpc >= tpc || !targs.subList(0, hpc).equals(hargs))
3136 throw misMatchedTypes("target and handler types", ttype, htype);
3137 handler = dropArguments(handler, 1+hpc, targs.subList(hpc, tpc));
3138 htype = handler.type();
3139 }
3140 return MethodHandleImpl.makeGuardWithCatch(target, exType, handler);
3141 }
3142
3143 /**
3144 * Produces a method handle which will throw exceptions of the given {@code exType}.
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