hamsterdb: fix HEAD, add Java option

Closes Homebrew/homebrew#22573.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/hamsterdb.rb

@@ -1,10 +1,38 @@
 require 'formula'
 
+class JavaRequirement < Requirement
+  fatal true
+
+  def self.jdk_home
+    [
+      `/usr/libexec/java_home`.chomp,
+      ENV['JAVA_HOME']
+    ].find { |dir| dir && File.exists?("#{dir}/bin/javac") && File.exists?("#{dir}/include") }
+  end
+
+  satisfy :build_env => false do
+    self.class.jdk_home
+  end
+
+  def message; <<-EOS.undent
+    Could not find a JDK (i.e. not a JRE)
+
+    Do one of the following:
+    - install a JDK that is detected with /usr/libexec/java_home
+    - set the JAVA_HOME environment variable
+    - specify --without-java
+    EOS
+  end
+end
+
 class Hamsterdb < Formula
   homepage 'http://hamsterdb.com'
   url 'http://hamsterdb.com/dl/hamsterdb-2.1.2.tar.gz'
   sha256 '5d1adbd25aad38646c83b8db013dc02af563c2447bd79b25aeac6cc287d098b0'
 
+  option 'without-java', 'Do not build the Java wrapper'
+  option 'without-remote', 'Disable access to remote databases'
+
   head do
     url 'https://github.com/cruppstahl/hamsterdb.git', :branch => 'topic/next'
 
@@ -12,11 +40,9 @@ class Hamsterdb < Formula
     depends_on 'libtool' => :build
   end
 
-  option 'without-java', 'Do not build the Java wrapper'
-  option 'without-remote', 'Disable access to remote databases'
-
   depends_on 'boost'
   depends_on 'gnutls'
+  depends_on JavaRequirement if build.with? 'java'
 
   if build.with? 'remote'
     depends_on 'protobuf'
@@ -24,21 +50,21 @@ class Hamsterdb < Formula
   end
 
   def install
-
+    system '/bin/sh', 'bootstrap.sh' if build.head?
-    if build.head?
-      inreplace 'bootstrap.sh', /^libtoolize/, 'glibtoolize'
-      system "./bootstrap.sh"
-    end
 
     features = []
-    features << '--disable-java' if build.without? 'java'
     features << '--disable-remote' if build.without? 'remote'
 
+    if build.with? 'java'
+      features << "JDK=#{JavaRequirement.jdk_home}"
+    else
+      features << '--disable-java'
+    end
+
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
                           "--prefix=#{prefix}",
                           *features
     system "make", "install"
-
   end
 
   test do