org.flywaydb.core.internal.util.FeatureDetector Maven / Gradle / Ivy
/**
* Copyright 2010-2016 Boxfuse GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.flywaydb.core.internal.util;
import org.flywaydb.core.internal.util.logging.Log;
import org.flywaydb.core.internal.util.logging.LogFactory;
/**
* Detects whether certain features are available or not.
*/
public final class FeatureDetector {
private static final Log LOG = LogFactory.getLog(FeatureDetector.class);
/**
* The ClassLoader to use.
*/
private ClassLoader classLoader;
/**
* Creates a new FeatureDetector.
*
* @param classLoader The ClassLoader to use.
*/
public FeatureDetector(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Flag indicating availability of the Apache Commons Logging.
*/
private Boolean apacheCommonsLoggingAvailable;
/**
* Flag indicating availability of the Slf4j.
*/
private Boolean slf4jAvailable;
/**
* Flag indicating availability of Spring JDBC.
*/
private Boolean springJdbcAvailable;
/**
* Flag indicating availability of JBoss VFS v2.
*/
private Boolean jbossVFSv2Available;
/**
* Flag indicating availability of JBoss VFS v3.
*/
private Boolean jbossVFSv3Available;
/**
* Flag indicating availability of the OSGi framework classes.
*/
private Boolean osgiFrameworkAvailable;
/**
* Flag indicating availability of the Android classes.
*/
private Boolean androidAvailable;
/**
* Checks whether Apache Commons Logging is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isApacheCommonsLoggingAvailable() {
if (apacheCommonsLoggingAvailable == null) {
apacheCommonsLoggingAvailable = ClassUtils.isPresent("org.apache.commons.logging.Log", classLoader);
}
return apacheCommonsLoggingAvailable;
}
/**
* Checks whether Slf4j is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isSlf4jAvailable() {
if (slf4jAvailable == null) {
slf4jAvailable = ClassUtils.isPresent("org.slf4j.Logger", classLoader);
}
return slf4jAvailable;
}
/**
* Checks whether Spring Jdbc is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isSpringJdbcAvailable() {
if (springJdbcAvailable == null) {
springJdbcAvailable = ClassUtils.isPresent("org.springframework.jdbc.core.JdbcTemplate", classLoader);
LOG.debug("Spring Jdbc available: " + springJdbcAvailable);
}
return springJdbcAvailable;
}
/**
* Checks whether JBoss VFS v2 is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isJBossVFSv2Available() {
if (jbossVFSv2Available == null) {
jbossVFSv2Available = ClassUtils.isPresent("org.jboss.virtual.VFS", classLoader);
LOG.debug("JBoss VFS v2 available: " + jbossVFSv2Available);
}
return jbossVFSv2Available;
}
/**
* Checks whether JBoss VFS is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isJBossVFSv3Available() {
if (jbossVFSv3Available == null) {
jbossVFSv3Available = ClassUtils.isPresent("org.jboss.vfs.VFS", classLoader);
LOG.debug("JBoss VFS v3 available: " + jbossVFSv3Available);
}
return jbossVFSv3Available;
}
/**
* Checks if OSGi framework is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isOsgiFrameworkAvailable() {
if (osgiFrameworkAvailable == null) {
osgiFrameworkAvailable = ClassUtils.isPresent("org.osgi.framework.Bundle", FeatureDetector.class.getClassLoader());
LOG.debug("OSGi framework available: " + osgiFrameworkAvailable);
}
return osgiFrameworkAvailable;
}
/**
* Checks if Android is available.
*
* @return {@code true} if it is, {@code false if it is not}
*/
public boolean isAndroidAvailable() {
if (androidAvailable == null) {
androidAvailable = "Android Runtime".equals(System.getProperty("java.runtime.name"));
}
return androidAvailable;
}
}