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#!/bin/sh
#
#   Checkstyle execution script
#   This script checks and only runs for java 8.  In addition, the scrip
#   assumes that the checkstyle-8.27-all.jar is in the same directory.
#
#   Usage: checkstyle.sh -c  
#   Configured Errors: 
#   * java in path and JAVA_HOME java is not version 1.8
#   * java command is not executable
#   * check-style violations
#

isJavaVersionValid () {
    JAVAVERSION=`$JAVACMD -version 2>&1 >/dev/null | grep 'java version' | awk '{ print $3 }'`
    JAVAVERSION=`echo ${JAVAVERSION//\"/}`
    case $JAVAVERSION in
        1.8*)
        exitValue="0";;
       *)
        exitValue="1";;
    esac
    echo "$exitValue"
}

SCRIPTDIR=$(cd `dirname $0`;pwd)
# Check for java for runtime only
# use java in path
JAVACMD=`which java`
if [ "$?" -eq "0" ]; then
	exitValue=$(isJavaVersionValid $JAVACMD)
fi
if [ "$exitValue" -ne "0" ]; then
    # version not valid, so check JAVA_HOME 
    if [ ! -z $JAVA_HOME ]; then
        JAVACMD="$JAVA_HOME/bin/java"
        if [ -e $JAVACMD ]; then
            exitValue=$(isJavaVersionValid $JAVACMD)
            if [ "$exitValue" != "0" ]; then
                exit 1;
            fi
        fi
    else
        echo "ERROR JAVA_HOME not defined"
        exit 1
    fi
fi