/*******************************************************************************
 * Copyright (c) 2001, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jem.internal.adapters.jdom;
/*
 *  $RCSfile: JavaReflectionSynchronizer.java,v $
 *  $Revision: 1.19 $  $Date: 2006/09/18 22:18:02 $ 
 */

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;

import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.jdt.core.*;

import org.eclipse.jem.internal.plugin.JavaPlugin;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jem.workbench.utility.JavaModelListener;

/**
 * Insert the type's description here.
 * Creation date: (11/1/2000 11:42:05 AM)
 * @author: Administrator
 */
public class JavaReflectionSynchronizer extends JavaModelListener {
	
	protected JavaJDOMAdapterFactory fAdapterFactory;

	protected boolean flushedAll = false;
	protected List flushTypes = new ArrayList();
	protected List flushTypePlusInner = new ArrayList();
	protected List notifications = new ArrayList();
	/**
	 * JavaReflectionSynchronizer constructor comment.
	 */
	public JavaReflectionSynchronizer(JavaJDOMAdapterFactory synchronizee) {
		super();
		fAdapterFactory = synchronizee;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jem.internal.adapters.jdom.JavaModelListener#getJavaProject()
	 */
	protected IJavaProject getJavaProject() {
		return getAdapterFactory().getJavaProject();
	}	
	/**
	 * Tell the reflection factory to flush the passed IType
	 */
	protected Notification doFlush(IType element) {
		return getAdapterFactory().flushReflectionNoNotification(element.getFullyQualifiedName());
	}
	
	/*
	 * Flush the compilation unit and any inner classes since we don't if they may or may not of changed.
	 */
	protected Notification doFlush(ICompilationUnit element) {
		return getAdapterFactory().flushReflectionPlusInnerNoNotification(getFullNameFromElement(element));
	}
	
	protected void flush(IType element) {
		if (!flushTypes.contains(element))
			flushTypes.add(element);
	}
	/*
	 * flush the compilation unit. Since we don't know if inner classes may also
	 * of been affected, they to will be flushed.
	 */
	protected void flush(ICompilationUnit element) {
		if (!flushTypePlusInner.contains(element))
			flushTypePlusInner.add(element);		
	}
	protected void flushPackage(String packageName, boolean noFlushIfSourceFound) {
		notifications.addAll(getAdapterFactory().flushPackageNoNotification(packageName, noFlushIfSourceFound));
	}
	protected JavaJDOMAdapterFactory getAdapterFactory() {
		return fAdapterFactory;
	}
	
	/**
	 * Handle the change for a single element, children will be handled separately.
	 *
	 */
	protected void processJavaElementChanged(ICompilationUnit element, IJavaElementDelta delta) {
		switch (delta.getKind()) {
			case IJavaElementDelta.CHANGED : {
				// A file save had occurred. It doesn't matter if currently working copy or not.
				// It means something has changed to the file on disk, but don't know what.
				if ((delta.getFlags() & IJavaElementDelta.F_PRIMARY_RESOURCE) != 0) {
					flush(element);	// Flush everything, including inner classes.					
				} else if ((delta.getFlags() & IJavaElementDelta.F_CONTENT) == 0 && 
						(delta.getFlags() & IJavaElementDelta.F_CHILDREN) != 0)  //A type may have been added or removed.
					processChildren(element, delta);
				break;
			}
			case IJavaElementDelta.REMOVED :
			case IJavaElementDelta.ADDED :
				if (!element.isWorkingCopy())
					disAssociateSourcePlusInner(getFullNameFromElement(element));
				break;
		}
	}
	
	/**
	 * Handle the change for a single element, children will be handled separately.
	 *
	 */
	protected void processJavaElementChanged(IJavaProject element, IJavaElementDelta delta) {
		if (isInClasspath(element)) {
			if (delta.getKind() == IJavaElementDelta.REMOVED || (delta.getKind() == IJavaElementDelta.CHANGED && (delta.getFlags() & IJavaElementDelta.F_CLOSED) != 0)) {
				if (element.equals(getAdapterFactory().getJavaProject()))
					stopSynchronizer();
				else
					flushAll(); //another dependent project has changed so flush all to be safe
				return;
			} else if (delta.getKind() == IJavaElementDelta.ADDED || isClasspathResourceChange(delta)) {
				flushAll();
				return;
			}
			processChildren(element, delta);
		}
	}
	/**
	 * Handle the change for a single element, children will be handled separately.
	 */
	protected void processJavaElementChanged(IClassFile element, IJavaElementDelta delta) {
		int kind = delta.getKind();
		if (kind == IJavaElementDelta.REMOVED || kind == IJavaElementDelta.ADDED) {
			// It doesn't matter if totally removed or just moved somewhere else, we will clear out and remove the
			// adapter because there could be a rename which would be a different class.
			// Currently the element is already deleted and there is no way to find the types in the unit to remove.
			// So instead we ask factory to remove all it any that start with it plus for inner classes.
			disAssociateSourcePlusInner(getFullNameFromElement(element));
			return; // Since the classfile was removed we don't need to process the children (actually the children list will be empty
		}
		IJavaElementDelta[] children = delta.getAffectedChildren();
		for (int ii = 0; ii < children.length; ii++) {
			processDelta(children[ii]);
		}
	}
	/**
	 * Handle the change for a single element, children will be handled separately.
	 *
	 */
	protected void processJavaElementChanged(IPackageFragmentRoot element, IJavaElementDelta delta) {
		if (flushedAll)
			return;
		if (isClassPathChange(delta))
			flushAll();
		else
			super.processJavaElementChanged(element, delta);
	}
	
	/* 
	 * We will force the flushing of all adaptors for the given package name.
	 * This is necessary if a type was reflected prior to the package existing or
	 * if the package is deleted.
	 * @see org.eclipse.jem.internal.adapters.jdom.JavaModelListener#processJavaElementChanged(org.eclipse.jdt.core.IPackageFragment, org.eclipse.jdt.core.IJavaElementDelta)
	 */
	protected void processJavaElementChanged(IPackageFragment element, IJavaElementDelta delta) {
		switch (delta.getKind()) {
			case IJavaElementDelta.ADDED : 
				// Even though added there is possibility that package exists in other root but this
				// one may now take priority, so we will clear the package anyway.
				flushPackage(delta.getElement().getElementName(), false);
				break;
			case IJavaElementDelta.REMOVED :
				getAdapterFactory().flushPackage(delta.getElement().getElementName(), false);
				break;
			default :
				super.processJavaElementChanged(element, delta);
		}
	}

	/**
	 * Handle the change for a single element, children will be handled separately.
	 *
	 */
	protected void processJavaElementChanged(IType element, IJavaElementDelta delta) {
		int kind = delta.getKind();
		if (kind == IJavaElementDelta.REMOVED || kind == IJavaElementDelta.ADDED) {
			disAssociateSourcePlusInner(element.getFullyQualifiedName());
		} else {
			flush(element);
			processChildren(element, delta);
			// Note, if a method element or a field was changed, there may be delta.getAffectedChildren()
			//       that will have to be processed if we are to update the JavaMethod/JavaField JDOMAdaptor s.	
		}
	}
	/**
	 * Given that an IType does not exists anymore, assume
	 * that the type's name is package.filename (without the .java)
	 * If we are wrong (if, then a rare case),  we will flush.
	 * Next access will induce a reflection attempt.
	 * @deprecated This doesn't look like it is ever called. It someone else calls it, please contact development to see if right method to be called.
	 */
	protected void processRemoveOrAdd(ICompilationUnit element) {
		disAssociateSource(getFullNameFromElement(element));
	}
	
	protected String getFullNameFromElement(ICompilationUnit cu) {
		IType primary = cu.findPrimaryType();
		if (primary != null)
			return primary.getFullyQualifiedName();
		else {
			String filename = cu.getElementName();
			// Just strip off extension. There is actually a more complicated test for "java like extenstions" but JDT has that hidden\
			// so we will just guess and take off the extension.
			int idx = filename.lastIndexOf('.');
			if (idx != -1)
				filename = filename.substring(0, idx);
			return ((IPackageFragment) cu.getParent()).getElementName()+'.'+filename;
		}
	}
	
	protected String getFullNameFromElement(IClassFile cf) {
		try {
			return cf.getType().getFullyQualifiedName();
		} catch (JavaModelException e) {
			JavaPlugin.getDefault().getLogger().log(e, Level.WARNING);
			String cfName = cf.getElementName();
			return cfName.substring(0, cfName.length()-(".class".length()));
		}
	}
	
	protected String getFullNameFromElement(IJavaElement element) {
		String name = element.getElementName();
		if (element == null || name.length() <= 5 || !name.substring(name.length() - 5).equals(".java")) { //$NON-NLS-1$
			// Should not be here, 
			Logger logger = JavaPlugin.getDefault().getLogger();
			if (logger.isLoggingLevel(Level.FINE))
				logger.log("Invalid .java file: " + name, Level.FINE); //$NON-NLS-1$
			// Make a guess, at worst case, nothing will come out of this.
			int index = name.lastIndexOf("."); //$NON-NLS-1$
			if (index >= 0)
				name = name.substring(0, index) + ".java"; // rename the extension to .java //$NON-NLS-1$
			else
				name = name + ".java"; //$NON-NLS-1$
		}
		if (element.getParent().getElementName() == null || element.getParent().getElementName().length() == 0)
			return name.substring(0, name.length() - 5);
		else
			return element.getParent().getElementName() + "." + name.substring(0, name.length() - 5); //$NON-NLS-1$
	}
	/**
	 * Stop the synchronizer from listening to any more changes.
	 */
	public void stopSynchronizer() {
		JavaCore.removeElementChangedListener(this);
	}
	/**
	 * @see org.eclipse.jem.internal.adapters.jdom.JavaModelListener#elementChanged(ElementChangedEvent)
	 */
	public void elementChanged(ElementChangedEvent event) {
		try {
			flushTypes.clear();
			flushTypePlusInner.clear();
			notifications.clear();
			super.elementChanged(event);
			flushTypes();
			processNotifications();
		} finally {
			flushedAll = false;
			flushTypes.clear();
			flushTypePlusInner.clear();
			notifications.clear();
		}
	}
	/**
	 * 
	 */
	private void flushTypes() {
		if (!flushTypes.isEmpty()) {
			IType type = null;
			Notification not;
			for (int i = 0; i < flushTypes.size(); i++) {
				type = (IType) flushTypes.get(i);
				not = doFlush(type);
				if (not != null)
					notifications.add(not);
			}
		}
		if (!flushTypePlusInner.isEmpty()) {
			ICompilationUnit unit = null;
			Notification not;
			for (int i = 0; i < flushTypePlusInner.size(); i++) {
				unit = (ICompilationUnit) flushTypePlusInner.get(i);
				not = doFlush(unit);
				if (not != null)
					notifications.add(not);
			}
		}		
	}
	/**
	 * @param notifications
	 */
	private void processNotifications() {
		Notifier notifier;
		Notification not;
		for (int i = 0; i < notifications.size(); i++) {
			not = (Notification) notifications.get(i);
			notifier = (Notifier) not.getNotifier();
			if (notifier != null)
				try {
					notifier.eNotify(not);
				} catch (Exception e) {
					JavaPlugin.getDefault().getLogger().log(e); //catch exceptions so all notifications are processed
				} 
		}
	}
	protected void disAssociateSource(String qualifiedName) {
		Notification not = getAdapterFactory().disAssociateSource(qualifiedName, false);
		if (not != null)
			notifications.add(not);
	}
	protected void disAssociateSourcePlusInner(String qualifiedName) {
		Notification not = getAdapterFactory().disAssociateSourcePlusInner(qualifiedName, false);
		if (not != null)
			notifications.add(not);
	}
	protected void flushAll() {
		notifications.addAll(getAdapterFactory().flushAllNoNotification());
		flushedAll = true;
	}
	/**
	 * @see org.eclipse.jem.internal.adapters.jdom.JavaModelListener#processChildren(IJavaElement, IJavaElementDelta)
	 */
	protected void processChildren(IJavaElement element, IJavaElementDelta delta) {
		if (!flushedAll)
			super.processChildren(element, delta);
	}
	/**
	 * @see org.eclipse.jem.internal.adapters.jdom.JavaModelListener#processDelta(IJavaElementDelta)
	 */
	public void processDelta(IJavaElementDelta delta) {
		if (!flushedAll)
			super.processDelta(delta);
	}
}