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package org.netbeans.modules.java.debug;

import java.util.Collections;
import java.util.List;
import org.netbeans.api.java.source.CancellableTask;
import org.netbeans.api.java.source.CompilationInfo;
import org.netbeans.api.java.source.JavaSource;
import org.netbeans.api.java.source.JavaSource.Phase;
import org.netbeans.api.java.source.JavaSource.Priority;
import org.netbeans.api.java.source.JavaSourceTaskFactory;
import org.netbeans.api.java.source.support.LookupBasedJavaSourceTaskFactory;
import org.netbeans.modules.java.debug.TreeNavigatorJavaSourceFactory.WrapperTask;
import org.netbeans.modules.parsing.spi.TaskIndexingMode;
import org.openide.filesystems.FileObject;
import org.openide.util.Lookup;

/**
 *
 * @author Jan Lahoda
 */
@org.openide.util.lookup.ServiceProvider(service=org.netbeans.api.java.source.JavaSourceTaskFactory.class)
public final class ElementNavigatorJavaSourceFactory extends LookupBasedJavaSourceTaskFactory {

    private CancellableTask<CompilationInfo> task;

    static ElementNavigatorJavaSourceFactory getInstance() {
        for (JavaSourceTaskFactory tf : Lookup.getDefault().lookupAll(JavaSourceTaskFactory.class)) {
            if (tf instanceof ElementNavigatorJavaSourceFactory) {
                return (ElementNavigatorJavaSourceFactory) tf;
            }
        }
        return null;
    }

    public ElementNavigatorJavaSourceFactory() {
        super(Phase.UP_TO_DATE, Priority.NORMAL, TaskIndexingMode.ALLOWED_DURING_SCAN);
    }

    public synchronized CancellableTask<CompilationInfo> createTask(FileObject file) {
        //XXX: should not be necessary to do the wrapper task, but for some reason it is necessary:
        return new WrapperTask(task);
    }

    public List<FileObject> getFileObjects() {
        List<FileObject> result = super.getFileObjects();

        if (result.size() == 1)
            return result;

        return Collections.emptyList();
    }

    public FileObject getFile() {
        List<FileObject> result = super.getFileObjects();
        
        if (result.size() == 1)
            return result.get(0);
        
        return null;
    }

    public synchronized void setLookup(Lookup l, CancellableTask<CompilationInfo> task) {
        this.task = task;
        super.setLookup(l);
    }

}
