pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / util / Constants.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/Constants.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/Constants.java
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+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);
+  }
+}