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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the 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.
*/
package org.apache.commons.lang3;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang3.arch.Processor;
import org.apache.commons.lang3.stream.Streams;
/**
* A utility class for the {@code os.arch} System Property. The class defines methods for
* identifying the architecture of the current JVM.
* <p>
* Important: The {@code os.arch} System Property returns the architecture used by the JVM
* not of the operating system.
* </p>
* @since 3.6
*/
public class ArchUtils {
private static final Map<String, Processor> ARCH_TO_PROCESSOR;
static {
ARCH_TO_PROCESSOR = new HashMap<>();
init();
}
private static void init() {
init_X86_32Bit();
init_X86_64Bit();
init_IA64_32Bit();
init_IA64_64Bit();
init_PPC_32Bit();
init_PPC_64Bit();
init_Aarch_64Bit();
}
private static void init_Aarch_64Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.AARCH_64);
addProcessors(processor, "aarch64");
}
private static void init_X86_32Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.X86);
addProcessors(processor, "x86", "i386", "i486", "i586", "i686", "pentium");
}
private static void init_X86_64Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.X86);
addProcessors(processor, "x86_64", "amd64", "em64t", "universal");
}
private static void init_IA64_32Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.IA_64);
addProcessors(processor, "ia64_32", "ia64n");
}
private static void init_IA64_64Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.IA_64);
addProcessors(processor, "ia64", "ia64w");
}
private static void init_PPC_32Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_32, Processor.Type.PPC);
addProcessors(processor, "ppc", "power", "powerpc", "power_pc", "power_rs");
}
private static void init_PPC_64Bit() {
final Processor processor = new Processor(Processor.Arch.BIT_64, Processor.Type.PPC);
addProcessors(processor, "ppc64", "power64", "powerpc64", "power_pc64", "power_rs64");
}
/**
* Adds the given {@link Processor} with the given key {@link String} to the map.
*
* @param key The key as {@link String}.
* @param processor The {@link Processor} to add.
* @throws IllegalStateException If the key already exists.
*/
private static void addProcessor(final String key, final Processor processor) {
if (ARCH_TO_PROCESSOR.containsKey(key)) {
throw new IllegalStateException("Key " + key + " already exists in processor map");
}
ARCH_TO_PROCESSOR.put(key, processor);
}
/**
* Adds the given {@link Processor} with the given keys to the map.
*
* @param keys The keys.
* @param processor The {@link Processor} to add.
* @throws IllegalStateException If the key already exists.
*/
private static void addProcessors(final Processor processor, final String... keys) {
Streams.of(keys).forEach(e -> addProcessor(e, processor));
}
/**
* Gets a {@link Processor} object of the current JVM.
*
* <p>
* Important: The os.arch System Property returns the architecture used by the JVM
* not of the operating system.
* </p>
*
* @return A {@link Processor} when supported, else {@code null}.
*/
public static Processor getProcessor() {
return getProcessor(SystemProperties.getOsArch());
}
/**
* Gets a {@link Processor} object the given value {@link String}. The {@link String} must be
* like a value returned by the {@code os.arch} System Property.
*
* @param value A {@link String} like a value returned by the {@code os.arch} System Property.
* @return A {@link Processor} when it exists, else {@code null}.
*/
public static Processor getProcessor(final String value) {
return ARCH_TO_PROCESSOR.get(value);
}
}
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