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package org.apache.lucene.util;
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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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* http://www.apache.org/licenses/LICENSE-2.0
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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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import org.apache.lucene.LucenePackage;
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* Some useful constants.
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public final class Constants {
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private Constants() {} // can't construct
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/** The value of <tt>System.getProperty("java.version")<tt>. **/
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public static final String JAVA_VERSION = System.getProperty("java.version");
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/** True iff this is Java version 1.1.
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* @deprecated This constant is useless since Lucene is on Java 5 */
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public static final boolean JAVA_1_1 = JAVA_VERSION.startsWith("1.1.");
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/** True iff this is Java version 1.2.
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* @deprecated This constant is useless since Lucene is on Java 5 */
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public static final boolean JAVA_1_2 = JAVA_VERSION.startsWith("1.2.");
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/** True iff this is Java version 1.3.
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* @deprecated This constant is useless since Lucene is on Java 5 */
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public static final boolean JAVA_1_3 = JAVA_VERSION.startsWith("1.3.");
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/** The value of <tt>System.getProperty("os.name")<tt>. **/
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public static final String OS_NAME = System.getProperty("os.name");
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/** True iff running on Linux. */
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public static final boolean LINUX = OS_NAME.startsWith("Linux");
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/** True iff running on Windows. */
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public static final boolean WINDOWS = OS_NAME.startsWith("Windows");
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/** True iff running on SunOS. */
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public static final boolean SUN_OS = OS_NAME.startsWith("SunOS");
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/** True iff running on Mac OS X */
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public static final boolean MAC_OS_X = OS_NAME.startsWith("Mac OS X");
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public static final String OS_ARCH = System.getProperty("os.arch");
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public static final String OS_VERSION = System.getProperty("os.version");
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public static final String JAVA_VENDOR = System.getProperty("java.vendor");
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public static final boolean JRE_IS_64BIT;
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public static final boolean JRE_IS_MINIMUM_JAVA6;
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public static final boolean JRE_IS_MINIMUM_JAVA7;
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// NOTE: this logic may not be correct; if you know of a
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// more reliable approach please raise it on java-dev!
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final String x = System.getProperty("sun.arch.data.model");
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JRE_IS_64BIT = x.indexOf("64") != -1;
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if (OS_ARCH != null && OS_ARCH.indexOf("64") != -1) {
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// this method only exists in Java 6:
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String.class.getMethod("isEmpty");
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} catch (NoSuchMethodException nsme) {
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JRE_IS_MINIMUM_JAVA6 = v6;
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// this method only exists in Java 7:
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Throwable.class.getMethod("getSuppressed");
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} catch (NoSuchMethodException nsme) {
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JRE_IS_MINIMUM_JAVA7 = v7;
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// this method prevents inlining the final version constant in compiled classes,
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// see: http://www.javaworld.com/community/node/3400
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private static String ident(final String s) {
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// NOTE: we track per-segment version as a String with the "X.Y" format, e.g.
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// "4.0", "3.1", "3.0". Therefore when we change this constant, we should keep
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public static final String LUCENE_MAIN_VERSION = ident("3.5");
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public static final String LUCENE_VERSION;
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Package pkg = LucenePackage.get();
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String v = (pkg == null) ? null : pkg.getImplementationVersion();
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v = LUCENE_MAIN_VERSION + "-SNAPSHOT";
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} else if (!v.startsWith(LUCENE_MAIN_VERSION)) {
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v = LUCENE_MAIN_VERSION + "-SNAPSHOT " + v;
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LUCENE_VERSION = ident(v);