/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the 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 implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package org.apache.commons.lang3; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.stream.Stream; |
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import org.apache.commons.lang3.arch.Processor; |
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/** |
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* An utility class for the os.arch System Property. The class defines methods for |
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* identifying the architecture of the current JVM. |
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* <p> |
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* Important: The os.arch System Property returns the architecture used by the JVM |
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* not of the operating system. |
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* </p> |
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* @since 3.6 |
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*/ |
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public class ArchUtils { |
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private static final Map<String, Processor> ARCH_TO_PROCESSOR; |
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static { |
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ARCH_TO_PROCESSOR = new HashMap<>(); |
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init(); |
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} |
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private static void init() { |
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init_X86_32Bit(); |
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init_X86_64Bit(); |
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init_IA64_32Bit(); |
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init_IA64_64Bit(); |
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init_PPC_32Bit(); |
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init_PPC_64Bit(); |
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} |
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private static void init_X86_32Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.X86); |
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addProcessors(processor, "x86", "i386", "i486", "i586", "i686", "pentium"); |
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} |
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private static void init_X86_64Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.X86); |
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addProcessors(processor, "x86_64", "amd64", "em64t", "universal"); |
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} |
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private static void init_IA64_32Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.IA_64); |
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addProcessors(processor, "ia64_32", "ia64n"); |
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} |
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private static void init_IA64_64Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.IA_64); |
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addProcessors(processor, "ia64", "ia64w"); |
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} |
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private static void init_PPC_32Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.PPC); |
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addProcessors(processor, "ppc", "power", "powerpc", "power_pc", "power_rs"); |
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} |
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private static void init_PPC_64Bit() { |
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final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.PPC); |
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addProcessors(processor, "ppc64", "power64", "powerpc64", "power_pc64", "power_rs64"); |
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} |
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/** |
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* Adds the given {@link Processor} with the given key {@link String} to the map. |
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* |
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* @param key The key as {@link String}. |
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* @param processor The {@link Processor} to add. |
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* @throws IllegalStateException If the key already exists. |
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*/ |
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private static void addProcessor(final String key, final Processor processor) { |
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if (ARCH_TO_PROCESSOR.containsKey(key)) { |
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throw new IllegalStateException("Key " + key + " already exists in processor map"); |
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} |
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ARCH_TO_PROCESSOR.put(key, processor); |
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} |
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/** |
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* Adds the given {@link Processor} with the given keys to the map. |
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* |
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* @param keys The keys. |
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* @param processor The {@link Processor} to add. |
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* @throws IllegalStateException If the key already exists. |
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*/ |
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private static void addProcessors(final Processor processor, final String... keys) { |
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Stream.of(keys).forEach(e -> addProcessor(e, processor)); |
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} |
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/** |
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* Returns a {@link Processor} object of the current JVM. |
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* |
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* <p> |
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* Important: The os.arch System Property returns the architecture used by the JVM |
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* not of the operating system. |
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* </p> |
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* |
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* @return A {@link Processor} when supported, else {@code null}. |
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*/ |
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public static Processor getProcessor() { |
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return getProcessor(SystemUtils.OS_ARCH); |
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} |
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/** |
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* Returns a {@link Processor} object the given value {@link String}. The {@link String} must be |
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* like a value returned by the os.arch System Property. |
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* |
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* @param value A {@link String} like a value returned by the os.arch System Property. |
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* @return A {@link Processor} when it exists, else {@code null}. |
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*/ |
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public static Processor getProcessor(final String value) { |
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return ARCH_TO_PROCESSOR.get(value); |
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} |
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} |