[ci] Add travis build on windows

* New parallel build for windows
* New before_install.sh script that prepares java, maven, ruby

.travis.yml

@@ -37,16 +37,15 @@ matrix:
     - name: "macosx - mvn verify"
       os: osx
       env: BUILD=deploy
+    - name: "windows - mvn verify"
+      os: windows
+      env: BUILD=deploy
+      language: shell
 
 before_install:
-  - bash .travis/setup-secrets.sh
-  - bash .travis/configure-maven.sh
-  - rvm install 2.4.1
-  - rvm use 2.4.1
-install:
-  - . .travis/install-openjdk.sh
-  - gem install bundler
-  - bundle install --with=release_notes_preprocessing --path=vendor/bundle
+  - bash .travis/before_install.sh
+  - source ${HOME}/java.env
+install: true
 before_script: true
 script: source .travis/build-$BUILD.sh
 after_success: true

.travis/before_install.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+source .travis/logger.sh
+source .travis/common-functions.sh
+
+travis_debug
+
+bash .travis/setup-secrets.sh
+bash .travis/configure-maven.sh
+bash .travis/install-openjdk.sh
+
+
+if travis_isLinux; then
+    rvm install 2.4.1
+    rvm use 2.4.1
+    gem install bundler
+    bundle install --with=release_notes_preprocessing --path=vendor/bundle
+else
+    log_info "Not setting up ruby for ${TRAVIS_OS_NAME}."
+    exit 0
+fi

.travis/build-deploy.sh

@@ -55,6 +55,11 @@ if travis_isOSX; then
     log_info "The build is running on OSX"
     ./mvnw verify $MVN_BUILD_FLAGS
 
+elif travis_isWindows; then
+
+    log_info "The build is running on Windows"
+    ./mvnw verify $MVN_BUILD_FLAGS
+
 elif travis_isPullRequest; then
 
     log_info "This is a pull-request build"

.travis/common-functions.sh

@@ -2,15 +2,17 @@
 set -e
 
 
-echo "TRAVIS_REPO_SLUG: ${TRAVIS_REPO_SLUG}"
-echo "TRAVIS_PULL_REQUEST_SLUG: ${TRAVIS_PULL_REQUEST_SLUG}"
-echo "TRAVIS_PULL_REQUEST_BRANCH: ${TRAVIS_PULL_REQUEST_BRANCH}"
-echo "TRAVIS_PULL_REQUEST: ${TRAVIS_PULL_REQUEST}"
-echo "TRAVIS_SECURE_ENV_VARS: ${TRAVIS_SECURE_ENV_VARS}"
-echo "TRAVIS_BRANCH: ${TRAVIS_BRANCH}"
-echo "TRAVIS_TAG: ${TRAVIS_TAG}"
-echo "TRAVIS_ALLOW_FAILURE: ${TRAVIS_ALLOW_FAILURE}"
-echo "TRAVIS_OS_NAME: ${TRAVIS_OS_NAME}"
+function travis_debug() {
+    echo "TRAVIS_REPO_SLUG: ${TRAVIS_REPO_SLUG}"
+    echo "TRAVIS_PULL_REQUEST_SLUG: ${TRAVIS_PULL_REQUEST_SLUG}"
+    echo "TRAVIS_PULL_REQUEST_BRANCH: ${TRAVIS_PULL_REQUEST_BRANCH}"
+    echo "TRAVIS_PULL_REQUEST: ${TRAVIS_PULL_REQUEST}"
+    echo "TRAVIS_SECURE_ENV_VARS: ${TRAVIS_SECURE_ENV_VARS}"
+    echo "TRAVIS_BRANCH: ${TRAVIS_BRANCH}"
+    echo "TRAVIS_TAG: ${TRAVIS_TAG}"
+    echo "TRAVIS_ALLOW_FAILURE: ${TRAVIS_ALLOW_FAILURE}"
+    echo "TRAVIS_OS_NAME: ${TRAVIS_OS_NAME}"
+}
 
 function travis_isPullRequest() {
     if [ "${TRAVIS_REPO_SLUG}" != "pmd/pmd" ] || [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then
@@ -36,6 +38,23 @@ function travis_isOSX() {
     fi
 }
 
+function travis_isLinux() {
+    if [[ $TRAVIS_OS_NAME == 'linux' ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+function travis_isWindows() {
+    if [[ $TRAVIS_OS_NAME == 'windows' ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+
 function has_docs_change() {
     if [[ $(git diff --name-only ${TRAVIS_COMMIT_RANGE}) = *"docs/"* ]]; then
         log_info "Checking for changes in docs/ (TRAVIS_COMMIT_RANGE=${TRAVIS_COMMIT_RANGE}): changes found"

.travis/install-openjdk.sh

@@ -1,13 +1,25 @@
+#!/bin/bash
+set -e
+
 #
 # AdoptOpenJDK Builds from:
 # https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/tag/jdk-11.0.4%2B11
 #
 
-if [[ "$OSTYPE" == "darwin"* ]]; then
-    DOWNLOAD_URL=https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.4%2B11/OpenJDK11U-jdk_x64_mac_hotspot_11.0.4_11.tar.gz
+source .travis/logger.sh
+source .travis/common-functions.sh
+
+VERSION_TAG="11.0.4+11"
+
+log_info "Installing OpenJDK ${VERSION_TAG} for ${TRAVIS_OS_NAME}"
+
+if travis_isOSX; then
+    DOWNLOAD_URL=https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-${VERSION_TAG/+/%2B}/OpenJDK11U-jdk_x64_mac_hotspot_${VERSION_TAG/+/_}.tar.gz
     COMPONENTS_TO_STRIP=3 # e.g. jdk-11.0.3+7/Contents/Home/bin/java
+elif travis_isWindows; then
+    DOWNLOAD_URL=https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-${VERSION_TAG/+/%2B}/OpenJDK11U-jdk_x64_windows_hotspot_${VERSION_TAG/+/_}.zip
 else
-    DOWNLOAD_URL=https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.4%2B11/OpenJDK11U-jdk_x64_linux_hotspot_11.0.4_11.tar.gz
+    DOWNLOAD_URL=https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-${VERSION_TAG/+/%2B}/OpenJDK11U-jdk_x64_linux_hotspot_${VERSION_TAG/+/_}.tar.gz
     COMPONENTS_TO_STRIP=1 # e.g. openjdk-11.0.3+7/bin/java
 fi
 
@@ -18,10 +30,24 @@ TARGET_DIR=${HOME}/openjdk11
 
 mkdir -p ${LOCAL_DIR}
 mkdir -p ${TARGET_DIR}
-wget --quiet --directory-prefix ${LOCAL_DIR} --timestamping --continue ${DOWNLOAD_URL}
-tar --extract --file ${LOCAL_DIR}/${OPENJDK_ARCHIVE} -C ${TARGET_DIR} --strip-components=${COMPONENTS_TO_STRIP}
+log_info "Downloading from ${DOWNLOAD_URL} to ${LOCAL_DIR}"
+wget --directory-prefix ${LOCAL_DIR} --timestamping --continue ${DOWNLOAD_URL}
 
-export JAVA_HOME=${TARGET_DIR}
-export PATH=${JAVA_HOME}/bin:$PATH
+log_info "Extracting to ${TARGET_DIR}"
+if travis_isWindows; then
+    7z x ${LOCAL_DIR}/${OPENJDK_ARCHIVE} -o${TARGET_DIR}
+    mv ${TARGET_DIR}/*/* ${TARGET_DIR}/
+else
+    tar --extract --file ${LOCAL_DIR}/${OPENJDK_ARCHIVE} -C ${TARGET_DIR} --strip-components=${COMPONENTS_TO_STRIP}
+fi
+
+cat > ${HOME}/java.env <<EOF
+export JAVA_HOME="${TARGET_DIR}"
+export PATH="${TARGET_DIR}/bin:${PATH}"
+EOF
+
+log_info "OpenJDK can be used via ${HOME}/java.env"
+cat ${HOME}/java.env
+source ${HOME}/java.env
 
 java -version