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package org.glassfish.persistence.jpa;
import org.glassfish.internal.deployment.GenericSniffer;
import org.glassfish.api.container.Sniffer;
import org.glassfish.api.deployment.archive.ReadableArchive;
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.component.Singleton;
import java.util.Enumeration;
import java.io.IOException;
/**
* Implementation of the Sniffer for JPA.
*
* @author Mitesh Meswani
*/
@Service(name="jpa")
@Scoped(Singleton.class)
public class JPASniffer extends GenericSniffer implements Sniffer {
private static final String[] containers = { "org.glassfish.persistence.jpa.JPAContainer" };
public JPASniffer() {
// We do not haGenericSniffer(String containerName, String appStigma, String urlPattern
super("jpa", null /* appStigma */, null /* urlPattern */);
}
private static char SEPERATOR_CHAR = '/';
private static final String WEB_INF = "WEB-INF";
private static final String LIB = "lib";
private static final String WEB_INF_LIB = WEB_INF + SEPERATOR_CHAR + LIB;
private static final String WEB_INF_CLASSSES = WEB_INF + SEPERATOR_CHAR + "classes";
private static final String META_INF_PERSISTENCE_XML = "META-INF" + SEPERATOR_CHAR + "persistence.xml";
private static final String WEB_INF_CLASSSES_META_INF_PERSISTENCE_XML = WEB_INF_CLASSSES + SEPERATOR_CHAR + META_INF_PERSISTENCE_XML;
private static final String JAR_SUFFIX = ".jar";
/**
* Returns true if the archive contains persistence.xml as defined by packaging rules of JPA
* Tries to getResource("META-INF/persitsence.xml") on current classLoader. If it succeeds, current archive is a pu
* root.
* This method will be called for each bundle inside an application which would include
* .war (the resource can be present in WEB-INF/classes or WEB-INF/lib/pu.jar),
* ejb.jar (the resource can be present in root of the jar),
*/
public boolean handles(ReadableArchive location, ClassLoader loader) {
boolean isJPAArchive = false;
// scan for persistence.xml in expected locations. If at least one is found, this is
// a jpa archive
//Scan for the war case
if(isEntryPresent(location, WEB_INF)) {
// First check for "WEB-INF/classes/META-INF/persistence.xml"
isJPAArchive = isEntryPresent(location, WEB_INF_CLASSSES_META_INF_PERSISTENCE_XML);
if (!isJPAArchive) {
// Check in WEB-INF/lib dir
if (isEntryPresent(location, WEB_INF_LIB)) {
isJPAArchive = scanForPURootsInLibDir(location, WEB_INF_LIB);
} // if (isEntryPresent(location, WEB_INF_LIb))
} // if (!isJPAArchive)
} else {
//Check for ejb jar case
isJPAArchive = isEntryPresent(location, META_INF_PERSISTENCE_XML);
}
return isJPAArchive;
}
protected boolean scanForPURootsInLibDir(ReadableArchive parentArchive, String libLocation) {
boolean puRootPresent = false;
if (libLocation != null && !libLocation.isEmpty()) { // if an application disables lib dir by specifying <library-directory></library-directory>, do not attempt to scan lib dir
Enumeration<String> entries = parentArchive.entries(libLocation);
while (entries.hasMoreElements() && !puRootPresent) {
String entryName = entries.nextElement();
if (entryName.endsWith(JAR_SUFFIX) && // a jar in lib dir
entryName.indexOf(SEPERATOR_CHAR, libLocation.length() + 1 ) == -1 ) { // && not WEB-INf/lib/foo/bar.jar
try {
ReadableArchive jarInLib = parentArchive.getSubArchive(entryName);
puRootPresent = isEntryPresent(jarInLib, META_INF_PERSISTENCE_XML);
jarInLib.close();
} catch (IOException e) {
// Something went wrong while reading the jar. Do not attempt to scan it
} // catch
} // if (entryName.endsWith(JAR_SUFFIX))
} // while
}
return puRootPresent;
}
private boolean isEntryPresent(ReadableArchive location, String entry) {
boolean entryPresent = false;
try {
entryPresent = location.exists(entry);
} catch (IOException e) {
// ignore
}
return entryPresent;
}
public String[] getContainersNames() {
return containers;
}
}