BootClassPathProvider.java

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package org.netbeans.modules.ruby.rubyproject;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.WeakHashMap;
import org.netbeans.api.java.classpath.ClassPath;
import org.netbeans.api.ruby.platform.RubyPlatform;
import org.netbeans.api.ruby.platform.RubyPlatformManager;
import org.netbeans.modules.ruby.RubyLanguage;
import org.netbeans.spi.java.classpath.ClassPathProvider;
import org.netbeans.spi.java.classpath.support.ClassPathSupport;
import org.openide.filesystems.FileObject;

/**
 * Supplies classpath information for Ruby installation files such as
 * gems, the standard library, corelibrary stubs, etc.  Based on the
 * Default provider in j2seplatform.
 * 
 * @author Tor Norbye
 */
@org.openide.util.lookup.ServiceProvider(service=org.netbeans.spi.java.classpath.ClassPathProvider.class, position=10005)
public class BootClassPathProvider implements ClassPathProvider {
    
    private Map<FileObject, WeakReference<ClassPath>> sourceClassPathsCache =
            new WeakHashMap<FileObject, WeakReference<ClassPath>>();
    
    //private /*WeakHash*/Map/*<FileObject,WeakReference<FileObject>>*/ sourceRootsCache = new WeakHashMap ();
    //private Reference/*<ClassPath>*/ compiledClassPath;
    
    /** Default constructor for lookup. */
    public BootClassPathProvider() {}
    
    public ClassPath findClassPath(FileObject file, String type) {
        if (type.equals(RubyLanguage.BOOT)) {
            // See if the file is under the Ruby libraries
            for (RubyPlatform platform : RubyPlatformManager.getPlatforms()) {
                if (!platform.isValid()) {
                    continue;
                }
                FileObject systemRoot = platform.getSystemRoot(file);
                if (systemRoot != null) {
                    return getRubyClassPaths(file, type, systemRoot);
                }
            }
        }
        return null;
    }
    
    private ClassPath getRubyClassPaths(FileObject file, String type, FileObject systemRoot) {
        // Default provider - do this for things like Ruby library files
        synchronized (this) {
            ClassPath cp = null;
            if (!file.isFolder()) {
                file = systemRoot;
            }
            if (file.isFolder()) {
                Reference ref = (Reference) this.sourceClassPathsCache.get (file);
                if (ref == null || (cp = (ClassPath)ref.get()) == null ) {
                    cp = ClassPathSupport.createClassPath(new FileObject[] {file});
                    this.sourceClassPathsCache.put(file, new WeakReference<ClassPath>(cp));
                }
            }
            return cp;                                        
        }
    }
}