| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file, and Oracle licenses the original version of this file under the BSD |
| * license: |
| */ |
| /* |
| Copyright 2009-2013 Attila Szegedi |
| |
| Licensed under both the Apache License, Version 2.0 (the "Apache License") |
| and the BSD License (the "BSD License"), with licensee being free to |
| choose either of the two at their discretion. |
| |
| You may not use this file except in compliance with either the Apache |
| License or the BSD License. |
| |
| If you choose to use this file in compliance with the Apache License, the |
| following notice applies to you: |
| |
| You may obtain a copy of the Apache License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| If you choose to use this file in compliance with the BSD License, the |
| following notice applies to you: |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| * Neither the name of the copyright holder nor the names of |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.dynalink.beans; |
| |
| import java.lang.invoke.MethodHandle; |
| import jdk.dynalink.linker.GuardedInvocation; |
| |
| /** |
| * Represents one component for a GuardedInvocation of a potentially multi-namespace operation of an |
| * {@link AbstractJavaLinker}. In addition to holding a guarded invocation, it holds semantic information about its |
| * guard. All guards produced in the AbstractJavaLinker are either "Class.isInstance()" or "getClass() == clazz" |
| * expressions. This allows choosing the most restrictive guard as the guard for the composition of two components. |
| */ |
| class GuardedInvocationComponent { |
| enum ValidationType { |
| NONE, // No guard; the operation can be linked unconditionally (quite rare); least strict. |
| INSTANCE_OF, // "validatorClass.isInstance(obj)" guard |
| EXACT_CLASS, // "obj.getClass() == validatorClass" guard; most strict. |
| IS_ARRAY, // "obj.getClass().isArray()" |
| } |
| |
| private final GuardedInvocation guardedInvocation; |
| private final Validator validator; |
| |
| GuardedInvocationComponent(final MethodHandle invocation) { |
| this(invocation, null, ValidationType.NONE); |
| } |
| |
| GuardedInvocationComponent(final MethodHandle invocation, final MethodHandle guard, final ValidationType validationType) { |
| this(invocation, guard, null, validationType); |
| } |
| |
| GuardedInvocationComponent(final MethodHandle invocation, final MethodHandle guard, final Class<?> validatorClass, |
| final ValidationType validationType) { |
| this(invocation, guard, new Validator(validatorClass, validationType)); |
| } |
| |
| GuardedInvocationComponent(final GuardedInvocation guardedInvocation, final Class<?> validatorClass, |
| final ValidationType validationType) { |
| this(guardedInvocation, new Validator(validatorClass, validationType)); |
| } |
| |
| GuardedInvocationComponent replaceInvocation(final MethodHandle newInvocation) { |
| return replaceInvocation(newInvocation, guardedInvocation.getGuard()); |
| } |
| |
| GuardedInvocationComponent replaceInvocation(final MethodHandle newInvocation, final MethodHandle newGuard) { |
| return new GuardedInvocationComponent(guardedInvocation.replaceMethods(newInvocation, |
| newGuard), validator); |
| } |
| |
| private GuardedInvocationComponent(final MethodHandle invocation, final MethodHandle guard, final Validator validator) { |
| this(new GuardedInvocation(invocation, guard), validator); |
| } |
| |
| private GuardedInvocationComponent(final GuardedInvocation guardedInvocation, final Validator validator) { |
| this.guardedInvocation = guardedInvocation; |
| this.validator = validator; |
| } |
| |
| GuardedInvocation getGuardedInvocation() { |
| return guardedInvocation; |
| } |
| |
| Class<?> getValidatorClass() { |
| return validator.validatorClass; |
| } |
| |
| ValidationType getValidationType() { |
| return validator.validationType; |
| } |
| |
| GuardedInvocationComponent compose(final MethodHandle compositeInvocation, final MethodHandle otherGuard, |
| final Class<?> otherValidatorClass, final ValidationType otherValidationType) { |
| final Validator compositeValidator = validator.compose(new Validator(otherValidatorClass, otherValidationType)); |
| final MethodHandle compositeGuard = compositeValidator == validator ? guardedInvocation.getGuard() : otherGuard; |
| return new GuardedInvocationComponent(compositeInvocation, compositeGuard, compositeValidator); |
| } |
| |
| private static class Validator { |
| /*private*/ final Class<?> validatorClass; |
| /*private*/ final ValidationType validationType; |
| |
| Validator(final Class<?> validatorClass, final ValidationType validationType) { |
| this.validatorClass = validatorClass; |
| this.validationType = validationType; |
| } |
| |
| Validator compose(final Validator other) { |
| if(other.validationType == ValidationType.NONE) { |
| return this; |
| } |
| switch(validationType) { |
| case NONE: |
| return other; |
| case INSTANCE_OF: |
| switch(other.validationType) { |
| case INSTANCE_OF: |
| if(isAssignableFrom(other)) { |
| return other; |
| } else if(other.isAssignableFrom(this)) { |
| return this; |
| } |
| break; |
| case EXACT_CLASS: |
| if(isAssignableFrom(other)) { |
| return other; |
| } |
| break; |
| case IS_ARRAY: |
| if(validatorClass.isArray()) { |
| return this; |
| } |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| break; |
| case EXACT_CLASS: |
| switch(other.validationType) { |
| case INSTANCE_OF: |
| if(other.isAssignableFrom(this)) { |
| return this; |
| } |
| break; |
| case EXACT_CLASS: |
| if(validatorClass == other.validatorClass) { |
| return this; |
| } |
| break; |
| case IS_ARRAY: |
| if(validatorClass.isArray()) { |
| return this; |
| } |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| break; |
| case IS_ARRAY: |
| switch(other.validationType) { |
| case INSTANCE_OF: |
| case EXACT_CLASS: |
| if(other.validatorClass.isArray()) { |
| return other; |
| } |
| break; |
| case IS_ARRAY: |
| return this; |
| default: |
| throw new AssertionError(); |
| } |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| throw new AssertionError("Incompatible composition " + this + " vs " + other); |
| } |
| |
| private boolean isAssignableFrom(final Validator other) { |
| return validatorClass.isAssignableFrom(other.validatorClass); |
| } |
| |
| @Override |
| public String toString() { |
| return "Validator[" + validationType + (validatorClass == null ? "" : (" " + validatorClass.getName())) + "]"; |
| } |
| } |
| } |