/lucene/src/java/org/apache/lucene/util/Constants.java
Java | 86 lines | 44 code | 11 blank | 31 comment | 14 complexity | 3e0f2e765db0b5375293f224ddadd1ab MD5 | raw file
- package org.apache.lucene.util;
- /**
- * 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.
- */
- import org.apache.lucene.LucenePackage;
- /**
- * Some useful constants.
- **/
- public final class Constants {
- private Constants() {} // can't construct
- /** The value of <tt>System.getProperty("java.version")<tt>. **/
- public static final String JAVA_VERSION = System.getProperty("java.version");
- /** True iff this is Java version 1.1. */
- public static final boolean JAVA_1_1 = JAVA_VERSION.startsWith("1.1.");
- /** True iff this is Java version 1.2. */
- public static final boolean JAVA_1_2 = JAVA_VERSION.startsWith("1.2.");
- /** True iff this is Java version 1.3. */
- public static final boolean JAVA_1_3 = JAVA_VERSION.startsWith("1.3.");
-
- /** The value of <tt>System.getProperty("os.name")<tt>. **/
- public static final String OS_NAME = System.getProperty("os.name");
- /** True iff running on Linux. */
- public static final boolean LINUX = OS_NAME.startsWith("Linux");
- /** True iff running on Windows. */
- public static final boolean WINDOWS = OS_NAME.startsWith("Windows");
- /** True iff running on SunOS. */
- public static final boolean SUN_OS = OS_NAME.startsWith("SunOS");
- public static final String OS_ARCH = System.getProperty("os.arch");
- public static final String OS_VERSION = System.getProperty("os.version");
- public static final String JAVA_VENDOR = System.getProperty("java.vendor");
- // NOTE: this logic may not be correct; if you know of a
- // more reliable approach please raise it on java-dev!
- public static final boolean JRE_IS_64BIT;
- static {
- String x = System.getProperty("sun.arch.data.model");
- if (x != null) {
- JRE_IS_64BIT = x.indexOf("64") != -1;
- } else {
- if (OS_ARCH != null && OS_ARCH.indexOf("64") != -1) {
- JRE_IS_64BIT = true;
- } else {
- JRE_IS_64BIT = false;
- }
- }
- }
- // this method prevents inlining the final version constant in compiled classes,
- // see: http://www.javaworld.com/community/node/3400
- private static String ident(final String s) {
- return s.toString();
- }
-
- public static final String LUCENE_MAIN_VERSION = ident("4.0");
- public static final String LUCENE_VERSION;
- static {
- Package pkg = LucenePackage.get();
- String v = (pkg == null) ? null : pkg.getImplementationVersion();
- if (v == null) {
- v = LUCENE_MAIN_VERSION + "-dev";
- } else if (!v.startsWith(LUCENE_MAIN_VERSION)) {
- v = LUCENE_MAIN_VERSION + "-dev " + v;
- }
- LUCENE_VERSION = ident(v);
- }
- }