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package org.netbeans.modules.scala.stdplatform.libraries;
import java.io.DataInputStream;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import org.netbeans.api.java.classpath.ClassPath;
import org.netbeans.api.project.libraries.Library;
import org.netbeans.api.project.libraries.LibraryManager;
import org.netbeans.spi.java.classpath.support.ClassPathSupport;
import org.netbeans.spi.java.queries.SourceLevelQueryImplementation;
import org.openide.filesystems.FileObject;
import org.openide.filesystems.FileUtil;
import org.openide.filesystems.URLMapper;
public class J2SELibrarySourceLevelQueryImpl implements SourceLevelQueryImplementation {
private static final String JDK_12 = "1.2"; //NOI18N
private static final String JDK_13 = "1.3"; //NOI18N
private static final String JDK_14 = "1.4"; //NOI18N
private static final String JDK_15 = "1.5"; //NOI18N
private static final String JDK_UNKNOWN = ""; //NOI18N
private static final String CLASS = "class"; //NOI18N
private static final int CF_MAGIC = 0xCAFEBABE;
private static final int CF_INVALID = -1;
private static final int CF_11 = 0x2d;
private static final int CF_12 = 0x2e;
private static final int CF_13 = 0x2f;
private static final int CF_14 = 0x30;
private static final int CF_15 = 0x31;
//Cache for source level
private Map<Library,String> sourceLevelCache = new WeakHashMap<Library,String>();
//Cache for last used library, helps since queries are sequential
private /*Soft*/Reference<FileObject> lastUsedRoot;
private /*Weak*/Reference<Library> lastUsedLibrary;
/** Creates a new instance of J2SELibrarySourceLevelQueryImpl */
public J2SELibrarySourceLevelQueryImpl() {
}
public String getSourceLevel(org.openide.filesystems.FileObject javaFile) {
Library ll = this.isLastUsed (javaFile);
if (ll != null) {
return getSourceLevel (ll);
}
for (LibraryManager mgr : LibraryManager.getOpenManagers()) {
for (Library lib : mgr.getLibraries()) {
if (!lib.getType().equals(J2SELibraryTypeProvider.LIBRARY_TYPE)) {
continue;
}
List<URL> sourceRoots = lib.getContent(J2SELibraryTypeProvider.VOLUME_TYPE_SRC);
if (sourceRoots.isEmpty()) {
continue;
}
ClassPath cp = ClassPathSupport.createClassPath(sourceRoots.toArray(new URL[sourceRoots.size()]));
FileObject root = cp.findOwnerRoot(javaFile);
if (root != null) {
setLastUsedRoot(root, lib);
return getSourceLevel(lib);
}
}
}
return null;
}
private String getSourceLevel (Library lib) {
String slevel = sourceLevelCache.get(lib);
if (slevel == null) {
slevel = getSourceLevel(lib.getContent(J2SELibraryTypeProvider.VOLUME_TYPE_CLASSPATH));
this.sourceLevelCache.put (lib,slevel);
}
return slevel == JDK_UNKNOWN ? null : slevel;
}
private String getSourceLevel (List cpRoots) {
FileObject classFile = getClassFile (cpRoots);
if (classFile == null) {
return JDK_UNKNOWN;
}
int version = getClassFileMajorVersion (classFile);
if (version == CF_11 || version == CF_12) {
return JDK_12;
}
else if (version == CF_13) {
return JDK_13;
}
else if (version == CF_14) {
return JDK_14;
}
else if (version >= CF_15) {
return JDK_15;
}
return JDK_UNKNOWN;
}
private FileObject getClassFile (List cpRoots) {
for (Iterator it = cpRoots.iterator(); it.hasNext();) {
FileObject root = URLMapper.findFileObject((URL)it.next());
if (root == null) {
continue;
}
FileObject cf = findClassFile (root);
if (cf != null) {
return cf;
}
}
return null;
}
private FileObject findClassFile (FileObject root) {
if (root.isData()) {
if (CLASS.equals(root.getExt())) {
return root;
}
else {
return null;
}
}
else {
FileObject[] children = root.getChildren();
for (int i=0; i<children.length; i++) {
FileObject result = findClassFile(children[i]);
if (result != null) {
return result;
}
}
return null;
}
}
private int getClassFileMajorVersion (FileObject classFile) {
DataInputStream in = null;
try {
in = new DataInputStream (classFile.getInputStream());
int magic = in.readInt();
if (CF_MAGIC != magic) {
return CF_INVALID;
}
short minor = in.readShort(); //Ignore it
short major = in.readShort();
return major;
} catch (IOException e) {
return CF_INVALID;
} finally {
if (in != null) {
try {
in.close ();
} catch (IOException e) {
//Ignore it, can not recover
}
}
}
}
private synchronized void setLastUsedRoot (FileObject root, Library lib) {
lastUsedRoot = new SoftReference<FileObject>(root);
lastUsedLibrary = new WeakReference<Library>(lib);
}
private synchronized Library isLastUsed (FileObject javaFile) {
if (lastUsedRoot == null) {
return null;
}
FileObject root = lastUsedRoot.get();
if (root == null) {
return null;
}
if (root.equals(javaFile) || FileUtil.isParentOf(root,javaFile)) {
return lastUsedLibrary.get();
}
return null;
}
}