ca.uhn.fhir.util.XmlDetectionUtil Maven / Gradle / Ivy
/*-
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2024 Smile CDR, Inc.
* %%
* 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.
* #L%
*/
package ca.uhn.fhir.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Reader;
import java.io.StringReader;
public class XmlDetectionUtil {
private static final Logger ourLog = LoggerFactory.getLogger(XmlDetectionUtil.class);
private static Boolean ourStaxPresent;
/**
* This method will return true if a StAX XML parsing library is present
* on the classpath
*/
public static boolean isStaxPresent() {
Boolean retVal = ourStaxPresent;
if (retVal == null) {
try {
Class.forName("javax.xml.stream.events.XMLEvent");
Class xmlUtilClazz = Class.forName("ca.uhn.fhir.util.XmlUtil");
xmlUtilClazz.getMethod("createXmlReader", Reader.class).invoke(xmlUtilClazz, new StringReader(""));
ourStaxPresent = Boolean.TRUE;
retVal = Boolean.TRUE;
} catch (Throwable t) {
ourLog.info("StAX not detected on classpath, XML processing will be disabled");
ourStaxPresent = Boolean.FALSE;
retVal = Boolean.FALSE;
}
}
return retVal;
}
}