author | attila |
Thu, 22 Oct 2015 10:43:10 +0200 | |
changeset 33345 | ef8c859f7992 |
parent 33343 | 23abd10384a5 |
child 33688 | 649d5d76f602 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2015 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink; |
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import java.util.Arrays; |
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import java.util.Objects; |
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|
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/** |
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* Describes an operation that is composed of at least two other operations. The |
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* component operations are treated as alternatives to each other in order of |
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* preference. The semantics of the composite operation is "first successful". |
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* That is, a composite of {@code GET_PROPERTY|GET_ELEMENT:color} should be |
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* interpreted as <i>get the property named "color" on the object, but if the |
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* property does not exist, then get the collection element named "color" |
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* instead</i>. |
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* <p> |
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* Composite operations are helpful in implementation of languages that |
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* don't distinguish between one or more of the property, method, and element |
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* namespaces, or when expressing operations against objects that can be |
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* considered both ordinary objects and collections, e.g. Java |
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* {@link java.util.Map} objects. A composite operation |
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* {@code GET_PROPERTY|GET_ELEMENT:empty} against a Java map will always match |
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* the {@link java.util.Map#isEmpty()} property, but |
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* {@code GET_ELEMENT|GET_PROPERTY:empty} will actually match a map element with |
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* key {@code "empty"} if the map contains that key, and only fall back to the |
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* {@code isEmpty()} property getter if the map does not contain the key. If |
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* the source language mandates this semantics, it can be easily achieved using |
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* composite operations. |
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* <p> |
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* Even if the language itself doesn't distinguish between some of the |
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* namespaces, it can be helpful to map different syntaxes to different |
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* compositions. E.g. the source expression {@code obj.color} could map to |
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* {@code GET_PROPERTY|GET_ELEMENT|GET_METHOD:color}, but a different source |
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* expression that looks like collection element access {@code obj[key]} could |
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* be expressed instead as {@code GET_ELEMENT|GET_PROPERTY|GET_METHOD}. |
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* Finally, if the retrieved value is subsequently called, then it makes sense |
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* to bring {@code GET_METHOD} to the front of the list: the getter part of the |
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* source expression {@code obj.color()} should be |
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* {@code GET_METHOD|GET_PROPERTY|GET_ELEMENT:color} and the one for |
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* {@code obj[key]()} should be {@code GET_METHOD|GET_ELEMENT|GET_PROPERTY}. |
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* <p> |
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* The elements of a composite operation can not be composites or named |
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* operations, but rather simple operations such are elements of |
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* {@link StandardOperation}. A composite operation itself can serve as the base |
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* operation of a named operation, though; a typical way to construct e.g. the |
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* {@code GET_ELEMENT|GET_PROPERTY:empty} from above would be: |
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* <pre> |
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* Operation getElementOrPropertyEmpty = new NamedOperation( |
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* new CompositeOperation( |
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* StandardOperation.GET_ELEMENT, |
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* StandardOperation.GET_PROPERTY), |
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* "empty"); |
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* </pre> |
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* <p> |
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* Not all compositions make sense. Typically, any combination in any order of |
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* standard getter operations {@code GET_PROPERTY}, {@code GET_ELEMENT}, and |
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* {@code GET_METHOD} make sense, as do combinations of {@code SET_PROPERTY} and |
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* {@code SET_ELEMENT}; other standard operations should not be combined. The |
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* constructor will allow any combination of operations, though. |
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*/ |
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public class CompositeOperation implements Operation { |
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private final Operation[] operations; |
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|
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/** |
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* Constructs a new composite operation. |
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* @param operations the components for this composite operation. The passed |
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* array will be cloned. |
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* @throws IllegalArgumentException if less than two components are |
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* specified, or any component is itself a {@link CompositeOperation} or a |
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* {@link NamedOperation}. |
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* @throws NullPointerException if either the operations array or any of its |
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* elements are {@code null}. |
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*/ |
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public CompositeOperation(final Operation... operations) { |
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Objects.requireNonNull(operations, "operations array is null"); |
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if (operations.length < 2) { |
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throw new IllegalArgumentException("Must have at least two operations"); |
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} |
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final Operation[] clonedOps = operations.clone(); |
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for(int i = 0; i < clonedOps.length; ++i) { |
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final Operation op = clonedOps[i]; |
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if (op == null) { |
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throw new NullPointerException("operations[" + i + "] is null"); |
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} else if (op instanceof NamedOperation) { |
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throw new IllegalArgumentException("operations[" + i + "] is a NamedOperation"); |
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} else if (op instanceof CompositeOperation) { |
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throw new IllegalArgumentException("operations[" + i + "] is a CompositeOperation"); |
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} |
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} |
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this.operations = clonedOps; |
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} |
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|
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/** |
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* Returns the component operations in this composite operation. The |
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* returned array is a copy and changes to it don't have effect on this |
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* object. |
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* @return the component operations in this composite operation. |
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*/ |
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public Operation[] getOperations() { |
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return operations.clone(); |
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} |
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|
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/** |
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* Returns the number of component operations in this composite operation. |
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* @return the number of component operations in this composite operation. |
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*/ |
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public int getOperationCount() { |
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return operations.length; |
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} |
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|
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/** |
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* Returns the i-th component operation in this composite operation. |
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* @param i the operation index |
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* @return the i-th component operation in this composite operation. |
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* @throws IndexOutOfBoundsException if the index is out of range. |
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*/ |
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public Operation getOperation(final int i) { |
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try { |
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return operations[i]; |
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} catch (final ArrayIndexOutOfBoundsException e) { |
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throw new IndexOutOfBoundsException(Integer.toString(i)); |
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} |
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} |
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|
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/** |
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* Returns true if this composite operation contains an operation equal to |
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* the specified operation. |
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* @param operation the operation being searched for. Must not be null. |
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* @return true if the if this composite operation contains an operation |
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* equal to the specified operation. |
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*/ |
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public boolean contains(final Operation operation) { |
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Objects.requireNonNull(operation); |
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for(final Operation component: operations) { |
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if (component.equals(operation)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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223 |
/** |
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* Returns true if the other object is also a composite operation and their |
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* component operations are equal. |
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* @param obj the object to compare to |
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* @return true if this object is equal to the other one, false otherwise. |
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*/ |
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@Override |
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public boolean equals(final Object obj) { |
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if (obj == null || obj.getClass() != CompositeOperation.class) { |
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return false; |
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} |
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return Arrays.equals(operations, ((CompositeOperation)obj).operations); |
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} |
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236 |
|
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237 |
/** |
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* Returns the hash code of this composite operation. Defined to be equal |
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* to {@code java.util.Arrays.hashCode(operations)}. |
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*/ |
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@Override |
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public int hashCode() { |
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return Arrays.hashCode(operations); |
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}; |
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|
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/** |
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* Returns the string representation of this composite operation. Defined to |
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* be the {@code toString} of its component operations, each separated by |
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* the vertical line character (e.g. {@code "GET_PROPERTY|GET_ELEMENT"}). |
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* @return the string representation of this composite operation. |
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*/ |
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@Override |
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public String toString() { |
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final StringBuilder b = new StringBuilder(); |
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b.append(operations[0]); |
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for(int i = 1; i < operations.length; ++i) { |
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b.append('|').append(operations[i]); |
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} |
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return b.toString(); |
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} |
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/** |
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* Returns the components of the passed operation if it is a composite |
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* operation, otherwise returns an array containing the operation itself. |
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* This allows for returning an array of component even if it is not known |
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* whether the operation is itself a composite (treating a non-composite |
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* operation as if it were a single-element composite of itself). |
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* @param op the operation whose components are retrieved. |
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* @return if the passed operation is a composite operation, returns its |
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* {@link #getOperations()}, otherwise returns the operation itself. |
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*/ |
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public static Operation[] getOperations(final Operation op) { |
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return op instanceof CompositeOperation |
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? ((CompositeOperation)op).operations.clone() |
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: new Operation[] { op }; |
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} |
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/** |
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* Returns true if the specified potentially composite operation is a |
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* {@link CompositeOperation} and contains an operation equal to the |
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* specified operation. If {@code composite} is not a |
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* {@link CompositeOperation}, then the two operations are compared for |
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* equality. |
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* @param composite the potentially composite operation. Must not be null. |
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* @param operation the operation being searched for. Must not be null. |
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* @return true if the if the passed operation is a |
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* {@link CompositeOperation} and contains a component operation equal to |
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* the specified operation, or if it is not a {@link CompositeOperation} and |
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* is equal to {@code operation}. |
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*/ |
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public static boolean contains(final Operation composite, final Operation operation) { |
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if (composite instanceof CompositeOperation) { |
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return ((CompositeOperation)composite).contains(operation); |
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} |
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return composite.equals(Objects.requireNonNull(operation)); |
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} |
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} |