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executable file 106 lines (94 sloc) 2.702 kb
#!/bin/bash
#
# Provides a function that allows you to choose a JDK. Just set the environment
# variable JDKS_ROOT to the directory containing multiple versions of the JDK
# and the function will prompt you to select one. JAVA_HOME and PATH will be cleaned
# up and set appropriately.
#
# Adapted from a Gist by headius / nicksieger: http://gist.github.com/143128
# With a few modifications inspired by:
# http://confluence.concord.org/display/CCTR/Build+OpenJDK+Java+1.7.0+on+Mac+OS+X+10.5
#
# sudo mkdir -p /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0-openjdk
# sudo ln -s /opt/local/share/java/openjdk6 /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0-openjdk/Home
_macosx()
{
if [ $(uname -s) = Darwin ]; then
return 0
else
return 1
fi
}
JDKS_ROOT=
if _macosx; then
JDKS_ROOT=/System/Library/Frameworks/JavaVM.framework/Versions
fi
pickjdk()
{
if [ -z "$JDKS_ROOT" ]; then
return 1
fi
declare -a JDKS
local n=1 jdk total_jdks choice=0 currjdk=$JAVA_HOME explicit_jdk
for jdk in $JDKS_ROOT/[0-9osdM]*; do
if [ -d $jdk -a ! -L $jdk ]; then
JDKNAMES[$n]="$(basename $jdk)"
if _macosx; then
jdk=$jdk/Home
fi
if [ -z "$1" ]; then
echo -n " $n) ${JDKNAMES[$n]}"
if [ $jdk = "$currjdk" ]; then
echo " < CURRENT"
else
echo
fi
fi
JDKS[$n]=$jdk
total_jdks=$n
n=$[ $n + 1 ]
fi
done
if [ -z "$1" ]; then
echo " $n) None"
fi
JDKS[$n]=None
total_jdks=$n
if [ $total_jdks -gt 1 ]; then
if [ -z "$1" ]; then
while [ -z "${JDKS[$choice]}" ]; do
echo -n "Choose one of the above [1-$total_jdks]: "
read choice
done
else
choice=$1
fi
fi
if [ -z "$currjdk" ]; then
currjdk=$(dirname $(dirname $(type -path java)))
fi
if [ ${JDKS[$choice]} != None ]; then
export JAVA_HOME=${JDKS[$choice]}
else
unset JAVA_HOME
fi
explicit_jdk=
for jdk in ${JDKS[*]}; do
if [ "$currjdk" = "$jdk" ]; then
explicit_jdk=$jdk
break
fi
done
if [ "$explicit_jdk" ]; then
if [ -z "$JAVA_HOME" ]; then
PATH=$(echo $PATH | sed "s|$explicit_jdk/bin:*||g")
else
PATH=$(echo $PATH | sed "s|$explicit_jdk|$JAVA_HOME|g")
fi
elif [ "$JAVA_HOME" ]; then
PATH="$JAVA_HOME/bin:$PATH"
fi
echo "New JDK: ${JDKNAMES[$choice]}"
hash -r
unset JDKS
}
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