source: trunk/in-the-cloud/findjava.sh

# Need to be in the folder containing a compiled-up search4j
# If a search4j executable is not there, then it means this is an SVN checkout. 
# In such a case, it's up to the user checking things out to ensure JAVA_HOME
# is set and that it moreover points to the correct version of the Java.

# Function to check if any JAVA_HOME is set and if so, try using that
function try_java {
    MIN_DISPLAY_VERSION=${1};

    if [ "x$JAVA_HOME" = "x" -o ! -f "$JAVA_HOME/bin/java" ]; then
        no_java "$MIN_DISPLAY_VERSION"
        return $?
    else
        # There is a JAVA_HOME already set, we're going to try using that
        javapath="$JAVA_HOME/bin/java"
        javahome="$JAVA_HOME"
        # Print a warning that we're going to use whatever JAVA_HOME is set (fingers crossed)
        if [ "x$exp_lang" = "x" -o "$exp_lang" = "en" ]; then
            echo
            echo "***************************************************************************"
            echo "WARNING: "
            echo "Java Runtime not bundled with this $PROGNAME installation."
            echo "Using JAVA_HOME: $JAVA_HOME"
            echo "(NOTE: this needs to be $MIN_DISPLAY_VERSION or higher.)"
            echo "***************************************************************************"
            echo
        fi
        echo "Java:"
        echo $javapath
        echo
        return 0
    fi
}

function no_java {
    MIN_DISPLAY_VERSION=${1};

    echo
    if [ "x$exp_lang" = "x" -o "$exp_lang" = "en" ]; then
        echo "Failed to locate an appropriate version of Java. You must install a"
        echo "Java Runtime Environment (version $MIN_DISPLAY_VERSION or greater) before running the"
        echo "$PROGNAME."
        echo "If you have Java installed on your machine please set the environment variable JAVA_HOME."
    fi
    return 1
}

function set_java_exec {        
    SEARCH4J_EXECUTABLE=${1};
    MINIMUM_JAVA_VERSION=${2};
    MIN_DISPLAY_VERSION=${3};

    # Give search4j a hint to find Java depending on the platform
    if [ "$EXPEDITEE_OS" = "linux" ]; then
        HINT=`cd "$EXPEDITEE_HOME";pwd`/packages/jre
    elif [ "$EXPEDITEE_OS" = "darwin" ]; then
        HINT=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
        #/System/Library/Frameworks/JavaVM.framework/Home
    fi  
    
    javapath="`"$SEARCH4J_EXECUTABLE" -e -p "$HINT" -m $MINIMUM_JAVA_VERSION`"
    javahome="`"$SEARCH4J_EXECUTABLE" -p "$HINT" -m $MINIMUM_JAVA_VERSION`"

    if [ "$?" != "0" ]; then
        
        OLDVER="`"$SEARCH4J_EXECUTABLE" -v -p "$HINT"`"
        
        if [ "$?" = "0" ]; then
            
            if [ "x$exp_lang" = "x" -o "$exp_lang" = "en" ]; then
                echo "The version of the Java Runtime Environment you have installed ($OLDVER)"
                echo "is too old to run the $PROGNAME. Please install a new"
                echo "version of the JRE (version $MIN_DISPLAY_VERSION or newer) and rerun this script."
            fi
            return 1
            
        else
            no_java "$MIN_DISPLAY_VERSION"
            return $?
        fi
        
    fi
    echo "Java:"
    echo $javapath
    echo
    return 0
}


## ---- Check Java ----
# Some users may set this line manually
javahome=
exp_lang=$1
PROGNAME=$2
MINIMUM_JAVA_VERSION=1.8.0_00
MIN_DISPLAY_VERSION=1.8
if [ "x$javahome" != "x" ]; then
    JAVA_HOME=$javahome;
    try_java "$MIN_DISPLAY_VERSION"
    retval=$?
    return $retval
fi

# sus out search4j
# first look for compiled search4j executable inside the current folder
if [ -x "search4j" ]; then
    SEARCH4J_EXECUTABLE="./search4j"
elif [ -x "$EXPEDITEE_HOME/bin/search4j" ]; then
    SEARCH4J_EXECUTABLE="$EXPEDITEE_HOME/bin/search4j"
else
    echo "Couldn't determine the location of the search4j executable"
    echo "If you are running Expeditee"
    echo "   * check EXPEDITEE_HOME is set"
    echo "   * check bin/search4j exists"
    echo "   * check bin/search4j is executable"
fi

# Now run set_java_exec with search4j if we found one, else try javahome
if [ "x$SEARCH4J_EXECUTABLE" != "x" ]; then
    set_java_exec "$SEARCH4J_EXECUTABLE" "$MINIMUM_JAVA_VERSION" "$MIN_DISPLAY_VERSION"
    retval=$?
else
    try_java "$MIN_DISPLAY_VERSION"
    retval=$?
fi
return $retval