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build: Create script to build java library (w/ jni-utils-rs)
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‎scripts/build-java.sh‎

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#!/usr/bin/env bash
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#
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# Build the Java/Android portion of btleplug (src/droidplug/java).
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#
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# Checks for and installs Java (via Homebrew on macOS) if necessary,
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# locates the Android SDK, then runs the Gradle build.
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#
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
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JAVA_DIR="$PROJECT_ROOT/src/droidplug/java"
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# --- Colors (if terminal) ---------------------------------------------------
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if [ -t 1 ]; then
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RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[0;33m'; NC='\033[0m'
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else
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RED=''; GREEN=''; YELLOW=''; NC=''
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fi
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info() { echo -e "${GREEN}[INFO]${NC} $*"; }
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warn() { echo -e "${YELLOW}[WARN]${NC} $*"; }
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error() { echo -e "${RED}[ERROR]${NC} $*" >&2; }
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die() { error "$@"; exit 1; }
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# --- Detect OS ---------------------------------------------------------------
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OS="$(uname -s)"
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# --- Java --------------------------------------------------------------------
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ensure_java() {
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if command -v java &>/dev/null && java -version &>/dev/null 2>&1; then
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local ver
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ver="$(java -version 2>&1 | head -1 | sed -E 's/.*"([0-9]+).*/\1/')"
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if [ "$ver" -ge 11 ] 2>/dev/null; then
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info "Java $ver found: $(command -v java)"
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return 0
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else
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warn "Java $ver found but AGP 7.4 requires Java >= 11"
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fi
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fi
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info "Java not found or too old — attempting to install..."
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case "$OS" in
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Darwin)
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if ! command -v brew &>/dev/null; then
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die "Homebrew not found. Install it from https://brew.sh or install Java 11+ manually."
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fi
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info "Installing openjdk@17 via Homebrew..."
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brew install openjdk@17
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# Homebrew installs openjdk to its prefix; create the system symlink
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# so /usr/libexec/java_home can find it. This may fail without sudo
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# but we can still use it directly via JAVA_HOME.
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local jdk_path
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jdk_path="$(brew --prefix openjdk@17)/libexec/openjdk.jdk/Contents/Home"
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if [ -d "$jdk_path" ]; then
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export JAVA_HOME="$jdk_path"
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export PATH="$JAVA_HOME/bin:$PATH"
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else
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die "openjdk@17 installed but JDK home not found at expected path."
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fi
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;;
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Linux)
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if command -v apt-get &>/dev/null; then
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info "Installing openjdk-17-jdk via apt..."
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sudo apt-get update -qq && sudo apt-get install -y -qq openjdk-17-jdk
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elif command -v dnf &>/dev/null; then
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info "Installing java-17-openjdk-devel via dnf..."
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sudo dnf install -y java-17-openjdk-devel
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elif command -v pacman &>/dev/null; then
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info "Installing jdk17-openjdk via pacman..."
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sudo pacman -S --noconfirm jdk17-openjdk
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else
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die "Could not detect package manager. Install Java 11+ manually."
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fi
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;;
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*)
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die "Unsupported OS '$OS'. Install Java 11+ manually."
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;;
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esac
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# Verify
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if ! command -v java &>/dev/null || ! java -version &>/dev/null 2>&1; then
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die "Java installation failed or 'java' is not on PATH."
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fi
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info "Java installed successfully."
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}
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# --- JAVA_HOME ---------------------------------------------------------------
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ensure_java_home() {
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if [ -n "${JAVA_HOME:-}" ] && [ -d "$JAVA_HOME" ]; then
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return 0
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fi
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case "$OS" in
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Darwin)
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JAVA_HOME="$(/usr/libexec/java_home 2>/dev/null || true)"
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# Fallback: check Homebrew openjdk directly
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if [ -z "${JAVA_HOME:-}" ] || [ ! -d "${JAVA_HOME:-}" ]; then
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for v in 17 21 11; do
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local brew_jdk
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brew_jdk="$(brew --prefix "openjdk@$v" 2>/dev/null || true)"
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if [ -n "$brew_jdk" ] && [ -d "$brew_jdk/libexec/openjdk.jdk/Contents/Home" ]; then
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JAVA_HOME="$brew_jdk/libexec/openjdk.jdk/Contents/Home"
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break
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fi
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done
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fi
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;;
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Linux)
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# Common locations
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for candidate in \
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/usr/lib/jvm/java-17-openjdk-amd64 \
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/usr/lib/jvm/java-17-openjdk \
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/usr/lib/jvm/java-17 \
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/usr/lib/jvm/default-java; do
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if [ -d "$candidate" ]; then
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JAVA_HOME="$candidate"
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break
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fi
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done
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;;
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esac
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if [ -z "${JAVA_HOME:-}" ]; then
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die "Could not determine JAVA_HOME. Set it manually and re-run."
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fi
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export JAVA_HOME
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info "JAVA_HOME=$JAVA_HOME"
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}
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# --- Android SDK -------------------------------------------------------------
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ensure_android_sdk() {
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if [ -n "${ANDROID_HOME:-}" ] && [ -d "$ANDROID_HOME" ]; then
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info "ANDROID_HOME=$ANDROID_HOME"
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return 0
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fi
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# Check ANDROID_SDK_ROOT (older env var)
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if [ -n "${ANDROID_SDK_ROOT:-}" ] && [ -d "$ANDROID_SDK_ROOT" ]; then
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export ANDROID_HOME="$ANDROID_SDK_ROOT"
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info "ANDROID_HOME=$ANDROID_HOME (from ANDROID_SDK_ROOT)"
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return 0
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fi
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# Common default locations
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local candidates=()
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case "$OS" in
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Darwin) candidates=("$HOME/Library/Android/sdk") ;;
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Linux) candidates=("$HOME/Android/Sdk" "$HOME/android-sdk") ;;
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esac
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for candidate in "${candidates[@]}"; do
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if [ -d "$candidate" ]; then
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export ANDROID_HOME="$candidate"
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info "ANDROID_HOME=$ANDROID_HOME (auto-detected)"
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return 0
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fi
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done
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die "Android SDK not found. Set ANDROID_HOME and re-run, or install via Android Studio / sdkmanager."
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}
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# --- Write local.properties --------------------------------------------------
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write_local_properties() {
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local props="$JAVA_DIR/local.properties"
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# Gradle Android plugin requires sdk.dir in local.properties
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echo "sdk.dir=$ANDROID_HOME" > "$props"
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info "Wrote $props"
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}
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# --- jni-utils SNAPSHOT dependency -------------------------------------------
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JNI_UTILS_DIR="$PROJECT_ROOT/../jni-utils-rs"
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build_jni_utils() {
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if [ ! -d "$JNI_UTILS_DIR/java" ]; then
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die "jni-utils-rs not found at $JNI_UTILS_DIR" \
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"Clone it with: git clone https://github.com/nickelc/jni-utils-rs $JNI_UTILS_DIR"
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fi
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local jni_java_dir
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jni_java_dir="$(cd "$JNI_UTILS_DIR/java" && pwd)"
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info "Building jni-utils Java library from $jni_java_dir ..."
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if [ ! -x "$jni_java_dir/gradlew" ]; then
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chmod +x "$jni_java_dir/gradlew"
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fi
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(cd "$jni_java_dir" && ./gradlew publishToMavenLocal -q)
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# Verify it landed
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local snapshot_dir="$HOME/.m2/repository/io/github/gedgygedgy/rust/jni-utils/0.1.1-SNAPSHOT"
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if [ ! -d "$snapshot_dir" ]; then
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die "jni-utils publishToMavenLocal succeeded but artifact not found in $snapshot_dir"
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fi
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info "jni-utils 0.1.1-SNAPSHOT published to mavenLocal."
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}
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# --- Build -------------------------------------------------------------------
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run_gradle_build() {
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info "Running Gradle build in $JAVA_DIR ..."
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cd "$JAVA_DIR"
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if [ ! -x ./gradlew ]; then
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chmod +x ./gradlew
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fi
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./gradlew assembleDebug "$@"
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info "Java build completed successfully."
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}
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# --- Main --------------------------------------------------------------------
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main() {
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info "btleplug Java/Android build"
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echo
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ensure_java
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ensure_java_home
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ensure_android_sdk
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write_local_properties
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build_jni_utils
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echo
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run_gradle_build "$@"
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}
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main "$@"

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