introduce new Expression methods to enhance the api #207

	# This workflow will build a Java project with Maven
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven

	name: Java CI with Maven

	on:
	[push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up JDK 17
	uses: actions/setup-java@v4
	with:
	java-version: 17
	distribution: 'adopt'
	server-id: ossrh
	server-username: OSSRH_USERNAME
	server-password: OSSRH_PASSWORD
	gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
	gpg-passphrase: MAVEN_GPG_PASSPHRASE
	- name: Build with Maven
	run: mvn -B compile --file pom.xml

	- name: Test with Maven
	run: mvn -B test --file pom.xml

	- name: Submit code coverage
	run: bash <(curl -s https://codecov.io/bash) -t ${{ secrets.CODECOV_SECRET }}

	- name: Publish to Apache Maven Central
	if: ${{ startsWith(github.ref, 'refs/tags/v') }}
	run: cat ~/.m2/settings.xml && mvn -DskipTests deploy -Dgpg.passphrase=${{ secrets.MAVEN_GPG_PASSPHRASE }}
	env:
	OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
	OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
	MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}

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