Revert "HAWQ-1645. Remove autogeneration of version number from pxf/build.gradle"

This reverts commit 67b64bc93031a6ef86b3ac33a732ce02b162d71b.
diff --git a/pxf/build.gradle b/pxf/build.gradle
index c1c86f7..3205967 100644
--- a/pxf/build.gradle
+++ b/pxf/build.gradle
@@ -153,6 +153,46 @@
 
 project('pxf-service') {
 
+// Copy existing sources and replace any occurrences of @tokenName@ with desired values
+    task generateSources {
+        doFirst {
+            copy {
+                from('src/main/java') {
+                    include '**/*.java'
+                    filter(ReplaceTokens,
+                        tokens:['pxfProtocolVersion': project.pxfProtocolVersion ])}
+                into "tmp/generatedSources"
+            }
+        }
+    }
+
+// Call cleanup taskAfter Java code compilation
+    compileJava.doLast {
+        tasks.cleanGeneratedSources.execute()
+    }
+
+// Delete "tmp" directory under current project directory
+// rm -r pxf-service/tmp
+    task cleanGeneratedSources() {
+        doFirst {
+            delete "tmp"
+        }
+    }
+
+// Call generateSources task before Java compilation
+    gradle.projectsEvaluated {
+        compileJava.dependsOn(generateSources)
+    }
+
+// Use custom sources directory with generated sources
+    sourceSets {
+        main {
+            java {
+                srcDirs = ["tmp/generatedSources"]
+            }
+        }
+    }
+
     apply plugin: 'war'
     tasks.war {
         archiveName = 'pxf.war'
@@ -505,7 +545,7 @@
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '3.0'
+    gradleVersion = '2.13'
 }
 
 def distSubprojects = subprojects - project(':pxf-api')
diff --git a/pxf/gradle/wrapper/gradle-wrapper.properties b/pxf/gradle/wrapper/gradle-wrapper.properties
index 0530bad..ef410fd 100644
--- a/pxf/gradle/wrapper/gradle-wrapper.properties
+++ b/pxf/gradle/wrapper/gradle-wrapper.properties
@@ -5,9 +5,9 @@
 # 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
@@ -15,9 +15,9 @@
 # specific language governing permissions and limitations
 # under the License.
 
-#Mon Jul 09 15:02:34 PDT 2018
+#Wed Aug 05 16:07:21 PDT 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-bin.zip
+distributionUrl=http\://services.gradle.org/distributions/gradle-2.13-all.zip
diff --git a/pxf/gradlew b/pxf/gradlew
index 7aa235e..48f44a9 100755
--- a/pxf/gradlew
+++ b/pxf/gradlew
@@ -16,9 +16,59 @@
 # limitations under the License.
 
 ##
-##  Gradle start up script for UN*X
+## Tries to recreate Gradle's gradlew command in pure bash.
+## This way you don't have to worry about binaries in your build.
 ##
-##############################################################################
+## Depdencies
+## unzip
+##
+
+set -e
+set -o pipefail
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+    MAX_FD="maximum"
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+bin=`dirname "$0"`
+bin=`cd "$bin">/dev/null; pwd`
+
+if [ -e "$bin/gradle/wrapper/gradle-wrapper.properties" ]; then
+  . "$bin/gradle/wrapper/gradle-wrapper.properties"
+else
+  # the location that the wrapper is at doesn't have a properties
+  # check PWD, gradlew may be shared
+  if [ -e "$PWD/gradle/wrapper/gradle-wrapper.properties" ]; then
+    . "$PWD/gradle/wrapper/gradle-wrapper.properties"
+  else
+    echo "Unable to locate gradle-wrapper.properties.  Not at $PWD/gradle/wrapper/gradle-wrapper.properties or $bin/gradle/wrapper/gradle-wrapper.properties" 1>&2
+    exit 1
+  fi
+fi
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+darwin=false
+case "`uname`" in
+  Darwin* )
+    darwin=true
+    ;;
+esac
 
 # Attempt to set APP_HOME
 # Resolve links: $0 may be a link
@@ -34,49 +84,9 @@
     fi
 done
 SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
+cd "`dirname \"$PRG\"`/" >&-
 APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
-
-APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
-
-# Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
-
-warn ( ) {
-    echo "$*"
-}
-
-die ( ) {
-    echo
-    echo "$*"
-    echo
-    exit 1
-}
-
-# OS specific support (must be 'true' or 'false').
-cygwin=false
-msys=false
-darwin=false
-nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
-esac
+cd "$SAVED" >&-
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
@@ -103,7 +113,7 @@
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+if [ "$darwin" = "false" ] ; then
     MAX_FD_LIMIT=`ulimit -H -n`
     if [ $? -eq 0 ] ; then
         if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
@@ -123,61 +133,88 @@
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
+# does not match gradle's hash
+# waiting for http://stackoverflow.com/questions/26642077/java-biginteger-in-bash-rewrite-gradlew
+hash() {
+  local input="$1"
+  if $darwin; then
+    md5 -q -s "$1"
+  else
+    echo -n "$1" | md5sum  | cut -d" " -f1
+  fi
+}
 
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+dist_path() {
+  local dir=$(basename $distributionUrl | sed 's;.zip;;g')
+  local id=$(hash "$distributionUrl")
 
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=$((i+1))
-    done
-    case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
-    esac
-fi
+  echo "$HOME/.gradle/${distributionPath:-wrapper/dists}/$dir/$id"
+}
+
+zip_path() {
+  local dir=$(basename $distributionUrl | sed 's;.zip;;g')
+  local id=$(hash "$distributionUrl")
+
+  echo "$HOME/.gradle/${zipStorePath:-wrapper/dists}/$dir/$id"
+}
+
+download() {
+  local base_path=$(dist_path)
+  local file_name=$(basename $distributionUrl)
+  local dir_name=$(echo "$file_name" | sed 's;-bin.zip;;g' | sed 's;-src.zip;;g' |sed 's;-all.zip;;g')
+
+  if [ ! -d "$base_path" ]; then
+    mkdir -p "$base_path"
+  else
+    # if data already exists, it means we failed to do this before
+    # so cleanup last run and try again
+    rm -rf $base_path/*
+  fi
+
+  # download dist. curl on mac doesn't like the cert provided...
+  local zip_path=$(zip_path)
+  curl --insecure -L -o "$zip_path/$file_name" "$distributionUrl"
+
+  pushd "$base_path"
+    touch "$file_name.lck"
+    unzip "$zip_path/$file_name" 1> /dev/null
+    touch "$file_name.ok"
+  popd
+}
+
+is_cached() {
+  local file_name=$(basename $distributionUrl)
+
+  [ -e "$(dist_path)/$file_name.ok" ]
+}
+
+lib_path() {
+  local base_path=$(dist_path)
+  local file_name=$(basename $distributionUrl | sed 's;-bin.zip;;g' | sed 's;-src.zip;;g' |sed 's;-all.zip;;g')
+
+  echo "$base_path/$file_name/lib"
+}
+
+classpath() {
+  local dir=$(lib_path)
+  local cp=$(ls -1 $dir/*.jar | tr '\n' ':')
+  echo "$dir:$cp"
+}
 
 # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
 function splitJvmOpts() {
     JVM_OPTS=("$@")
 }
-eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
-JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]]; then
-  cd "$(dirname "$0")"
-fi
+main() {
+  if ! is_cached; then
+    download
+  fi
 
-exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
+  eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+  JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+  $JAVACMD "${JVM_OPTS[@]}" -cp $(classpath) org.gradle.launcher.GradleMain "$@"
+}
+
+main "$@"
diff --git a/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/rest/VersionResource.java b/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/rest/VersionResource.java
index 32779d8..c9f4d20 100644
--- a/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/rest/VersionResource.java
+++ b/pxf/pxf-service/src/main/java/org/apache/hawq/pxf/service/rest/VersionResource.java
@@ -39,7 +39,7 @@
      * actual value on build stage, using pxfProtocolVersion parameter from
      * gradle.properties
      */
-    final static String PXF_PROTOCOL_VERSION = "v15";
+    final static String PXF_PROTOCOL_VERSION = "@pxfProtocolVersion@";
 
     public Version() {
     }
diff --git a/pxf/pxf-service/src/main/webapp/WEB-INF/web.xml b/pxf/pxf-service/src/main/webapp/WEB-INF/web.xml
index 4719f78..8d033e1 100644
--- a/pxf/pxf-service/src/main/webapp/WEB-INF/web.xml
+++ b/pxf/pxf-service/src/main/webapp/WEB-INF/web.xml
@@ -67,7 +67,7 @@
     </filter>
     <filter-mapping>
         <filter-name>PXF Security Filter</filter-name>
-        <url-pattern>/v15/*</url-pattern>
+        <url-pattern>/@pxfProtocolVersion@/*</url-pattern>
     </filter-mapping>
 
     <!-- log4j configuration