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#!/bin/bash

# MIT License

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all

# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

# SOFTWARE.

if [ `id -u` -ne 0 ]

then

echo "Permission denied. Please start with sudo."

exit 1

echo "Your current Java version: "

Java -version

echo "------------------------------------------------------"

echo "Select a Java version you want to use:"

# Collect the folders in the array $folders

folders=( /Library/Java/JavaVirtualMachines/* )

# Enable extended globbing. This lets us use @(foo|bar) to

# match either 'foo' or 'bar'.

shopt -s extglob

# Start building the string to match against.

string="@(${folders[0]}"

# Add the rest of the folders to the string

for((i=1;i<${#folders[@]};i++))

string+="|${folders[$i]}"

done

# Close the parenthesis. $string is now @(folder1|folder2|...|folderN)

string+=")"

# Show the menu. This will list all folders and the string "quit"

select selected_java_version in "${folders[@]}" "quit"

case $selected_java_version in

# If the choice is one of the folders (if it matches $string)

$string)

echo "Setting Java version from \"$selected_java_version\" as current version."

# Loop through java versions again

for java_version in ${folders[@]}

# If there's no info.plist or info.plist.disabled file, notify the user.

if [ ! -f "$java_version/Contents/Info.plist" ] &&

[ ! -f "$java_version/Contents/Info.plist.disabled" ]

then

echo "No Info.plist or Info.plist.disabled file found for $java_version. \n Please check this installation."

break

# When a java version does not match the selected version

# if there is an Info.plist file, rename -> Info.plist.disabled

if [ "$java_version" != "$selected_java_version" ] &&

[ -f "$java_version/Contents/Info.plist" ]

then

`mv $java_version/Contents/Info.plist $java_version/Contents/Info.plist.disabled`

# When a java version matches the selected version

# if there is no Info.plist file but there is an Info.plist.disabled, rename -> Info.plist

elif [ "$java_version" == "$selected_java_version" ] &&

[ ! -f "$selected_java_version/Contents/Info.plist" ] &&

[ -f "$selected_java_version/Contents/Info.plist.disabled" ]

then

`mv $java_version/Contents/Info.plist.disabled $java_version/Contents/Info.plist`

done

break;

;;

"quit")

# Exit

exit;;

selected_java_version=""

echo "Please choose a number from 1 to $((${#folders[@]}+1))";;

esac

done

echo "Done!"

echo "------------------------------------------------------"

echo "Your new Java version: "

Java -version

exit 0