/src/java/org/apache/lucene/util/Constants.java
Java | 118 lines | 64 code | 14 blank | 40 comment | 14 complexity | e67c51256cd639496ba66de58c412192 MD5 | raw file
Possible License(s): BSD-3-Clause
- 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.
- * @deprecated This constant is useless since Lucene is on Java 5 */
- @Deprecated
- public static final boolean JAVA_1_1 = JAVA_VERSION.startsWith("1.1.");
- /** True iff this is Java version 1.2.
- * @deprecated This constant is useless since Lucene is on Java 5 */
- @Deprecated
- public static final boolean JAVA_1_2 = JAVA_VERSION.startsWith("1.2.");
- /** True iff this is Java version 1.3.
- * @deprecated This constant is useless since Lucene is on Java 5 */
- @Deprecated
- 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");
- /** True iff running on Mac OS X */
- public static final boolean MAC_OS_X = OS_NAME.startsWith("Mac OS X");
- 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");
- public static final boolean JRE_IS_64BIT;
- public static final boolean JRE_IS_MINIMUM_JAVA6;
- public static final boolean JRE_IS_MINIMUM_JAVA7;
- static {
- // NOTE: this logic may not be correct; if you know of a
- // more reliable approach please raise it on java-dev!
- final 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 only exists in Java 6:
- boolean v6 = true;
- try {
- String.class.getMethod("isEmpty");
- } catch (NoSuchMethodException nsme) {
- v6 = false;
- }
- JRE_IS_MINIMUM_JAVA6 = v6;
-
- // this method only exists in Java 7:
- boolean v7 = true;
- try {
- Throwable.class.getMethod("getSuppressed");
- } catch (NoSuchMethodException nsme) {
- v7 = false;
- }
- JRE_IS_MINIMUM_JAVA7 = v7;
- }
- // 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();
- }
-
- // NOTE: we track per-segment version as a String with the "X.Y" format, e.g.
- // "4.0", "3.1", "3.0". Therefore when we change this constant, we should keep
- // the format.
- public static final String LUCENE_MAIN_VERSION = ident("3.5");
- 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 + "-SNAPSHOT";
- } else if (!v.startsWith(LUCENE_MAIN_VERSION)) {
- v = LUCENE_MAIN_VERSION + "-SNAPSHOT " + v;
- }
- LUCENE_VERSION = ident(v);
- }
- }