org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/Openable.java - objectteams/org.eclipse.objectteams - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2013 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.jdt.internal.core;

 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;

 import org.eclipse.core.resources.*;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.PerformanceStats;
 import org.eclipse.jdt.core.*;
 import org.eclipse.jdt.internal.codeassist.CompletionEngine;
 import org.eclipse.jdt.internal.codeassist.SelectionEngine;
 import org.eclipse.jdt.internal.core.util.Util;


 /**
  * Abstract class for implementations of java elements which are IOpenable.
  *
  * @see IJavaElement
  * @see IOpenable
  */
 @SuppressWarnings({"rawtypes"})
 public abstract class Openable extends JavaElement implements IOpenable, IBufferChangedListener {

 protected Openable(JavaElement parent) {
 	super(parent);
 }
 /**
  * The buffer associated with this element has changed. Registers
  * this element as being out of synch with its buffer's contents.
  * If the buffer has been closed, this element is set as NOT out of
  * synch with the contents.
  *
  * @see IBufferChangedListener
  */
 public void bufferChanged(BufferChangedEvent event) {
 	if (event.getBuffer().isClosed()) {
 		JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().remove(this);
 		getBufferManager().removeBuffer(event.getBuffer());
 	} else {
 		JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().add(this);
 	}
 }
 /**
  * Builds this element's structure and properties in the given
  * info object, based on this element's current contents (reuse buffer
  * contents if this element has an open buffer, or resource contents
  * if this element does not have an open buffer). Children
  * are placed in the given newElements table (note, this element
  * has already been placed in the newElements table). Returns true
  * if successful, or false if an error is encountered while determining
  * the structure of this element.
  */
 protected abstract boolean buildStructure(OpenableElementInfo info, IProgressMonitor pm, Map newElements, IResource underlyingResource) throws JavaModelException;
 /*
  * Returns whether this element can be removed from the Java model cache to make space.
  */
 public boolean canBeRemovedFromCache() {
 	try {
 		return !hasUnsavedChanges();
 	} catch (JavaModelException e) {
 		return false;
 	}
 }
 /*
  * Returns whether the buffer of this element can be removed from the Java model cache to make space.
  */
 public boolean canBufferBeRemovedFromCache(IBuffer buffer) {
 	return !buffer.hasUnsavedChanges();
 }
 /**
  * Close the buffer associated with this element, if any.
  */
 protected void closeBuffer() {
 	if (!hasBuffer()) return; // nothing to do
 	IBuffer buffer = getBufferManager().getBuffer(this);
 	if (buffer != null) {
 		buffer.close();
 		buffer.removeBufferChangedListener(this);
 	}
 }
 /**
  * This element is being closed.  Do any necessary cleanup.
  */
 protected void closing(Object info) {
 	closeBuffer();
 }
 protected void codeComplete(
 		org.eclipse.jdt.internal.compiler.env.ICompilationUnit cu,
 		org.eclipse.jdt.internal.compiler.env.ICompilationUnit unitToSkip,
 		int position, CompletionRequestor requestor,
 		WorkingCopyOwner owner,
 		ITypeRoot typeRoot,
 		IProgressMonitor monitor) throws JavaModelException {
 	if (requestor == null) {
 		throw new IllegalArgumentException("Completion requestor cannot be null"); //$NON-NLS-1$
 	}
 	PerformanceStats performanceStats = CompletionEngine.PERF
 		? PerformanceStats.getStats(JavaModelManager.COMPLETION_PERF, this)
 		: null;
 	if(performanceStats != null) {
 		performanceStats.startRun(new String(cu.getFileName()) + " at " + position); //$NON-NLS-1$
 	}
 	IBuffer buffer = getBuffer();
 	if (buffer == null) {
 		return;
 	}
 	if (position < -1 || position > buffer.getLength()) {
 		throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INDEX_OUT_OF_BOUNDS));
 	}
 	JavaProject project = (JavaProject) getJavaProject();
 	SearchableEnvironment environment = project.newSearchableNameEnvironment(owner);

 	// set unit to skip
 	environment.unitToSkip = unitToSkip;

 	// code complete
 	CompletionEngine engine = new CompletionEngine(environment, requestor, project.getOptions(true), project, owner, monitor);
 	engine.complete(cu, position, 0, typeRoot);
 	if(performanceStats != null) {
 		performanceStats.endRun();
 	}
 	if (NameLookup.VERBOSE) {
 		System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInSourcePackage: " + environment.nameLookup.timeSpentInSeekTypesInSourcePackage + "ms");  //$NON-NLS-1$ //$NON-NLS-2$
 		System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInBinaryPackage: " + environment.nameLookup.timeSpentInSeekTypesInBinaryPackage + "ms");  //$NON-NLS-1$ //$NON-NLS-2$
 	}
 }
 protected IJavaElement[] codeSelect(org.eclipse.jdt.internal.compiler.env.ICompilationUnit cu, int offset, int length, WorkingCopyOwner owner) throws JavaModelException {
 	PerformanceStats performanceStats = SelectionEngine.PERF
 		? PerformanceStats.getStats(JavaModelManager.SELECTION_PERF, this)
 		: null;
 	if(performanceStats != null) {
 		performanceStats.startRun(new String(cu.getFileName()) + " at [" + offset + "," + length + "]"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 	}

 	JavaProject project = (JavaProject)getJavaProject();
 	SearchableEnvironment environment = project.newSearchableNameEnvironment(owner);

 	SelectionRequestor requestor= new SelectionRequestor(environment.nameLookup, this);
 	IBuffer buffer = getBuffer();
 	if (buffer == null) {
 		return requestor.getElements();
 	}
 	int end= buffer.getLength();
 	if (offset < 0 || length < 0 || offset + length > end ) {
 		throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INDEX_OUT_OF_BOUNDS));
 	}

 	// fix for 1FVXGDK
 	SelectionEngine engine = new SelectionEngine(environment, requestor, project.getOptions(true), owner);
 	engine.select(cu, offset, offset + length - 1);

 	if(performanceStats != null) {
 		performanceStats.endRun();
 	}
 	if (NameLookup.VERBOSE) {
 		System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInSourcePackage: " + environment.nameLookup.timeSpentInSeekTypesInSourcePackage + "ms");  //$NON-NLS-1$ //$NON-NLS-2$
 		System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInBinaryPackage: " + environment.nameLookup.timeSpentInSeekTypesInBinaryPackage + "ms");  //$NON-NLS-1$ //$NON-NLS-2$
 	}
 	return requestor.getElements();
 }
 /*
  * Returns a new element info for this element.
  */
 protected Object createElementInfo() {
 	return new OpenableElementInfo();
 }
 /**
  * @see IJavaElement
  */
 public boolean exists() {
 	if (JavaModelManager.getJavaModelManager().getInfo(this) != null)
 		return true;
 	switch (getElementType()) {
 		case IJavaElement.PACKAGE_FRAGMENT:
 			PackageFragmentRoot root = getPackageFragmentRoot();
 			if (root.isArchive()) {
 				// pkg in a jar -> need to open root to know if this pkg exists
 				JarPackageFragmentRootInfo rootInfo;
 				try {
 					rootInfo = (JarPackageFragmentRootInfo) root.getElementInfo();
 				} catch (JavaModelException e) {
 					return false;
 				}
 				return rootInfo.rawPackageInfo.containsKey(((PackageFragment) this).names);
 			}
 			break;
 		case IJavaElement.CLASS_FILE:
 			if (getPackageFragmentRoot().isArchive()) {
 				// class file in a jar -> need to open this class file to know if it exists
 				return super.exists();
 			}
 			break;
 	}
 	return validateExistence(resource()).isOK();
 }
 public String findRecommendedLineSeparator() throws JavaModelException {
 	IBuffer buffer = getBuffer();
 	String source = buffer == null ? null : buffer.getContents();
 	return Util.getLineSeparator(source, getJavaProject());
 }
 protected void generateInfos(Object info, HashMap newElements, IProgressMonitor monitor) throws JavaModelException {

 	if (JavaModelCache.VERBOSE){
 		String element;
 		switch (getElementType()) {
 			case JAVA_PROJECT:
 				element = "project"; //$NON-NLS-1$
 				break;
 			case PACKAGE_FRAGMENT_ROOT:
 				element = "root"; //$NON-NLS-1$
 				break;
 			case PACKAGE_FRAGMENT:
 				element = "package"; //$NON-NLS-1$
 				break;
 			case CLASS_FILE:
 				element = "class file"; //$NON-NLS-1$
 				break;
 			case COMPILATION_UNIT:
 				element = "compilation unit"; //$NON-NLS-1$
 				break;
 			default:
 				element = "element"; //$NON-NLS-1$
 		}
 		System.out.println(Thread.currentThread() +" OPENING " + element + " " + this.toStringWithAncestors()); //$NON-NLS-1$//$NON-NLS-2$
 	}

 	// open its ancestors if needed
 	openAncestors(newElements, monitor);

 	// validate existence
 	IResource underlResource = resource();
 	IStatus status = validateExistence(underlResource);
 	if (!status.isOK())
 		throw newJavaModelException(status);

 	if (monitor != null && monitor.isCanceled())
 		throw new OperationCanceledException();

 	 // puts the info before building the structure so that questions to the handle behave as if the element existed
 	 // (case of compilation units becoming working copies)
 	newElements.put(this, info);

 	// build the structure of the openable (this will open the buffer if needed)
 	try {
 		OpenableElementInfo openableElementInfo = (OpenableElementInfo)info;
 		boolean isStructureKnown = buildStructure(openableElementInfo, monitor, newElements, underlResource);
 		openableElementInfo.setIsStructureKnown(isStructureKnown);
 	} catch (JavaModelException e) {
 		newElements.remove(this);
 		throw e;
 	}

 	// remove out of sync buffer for this element
 	JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().remove(this);

 	if (JavaModelCache.VERBOSE) {
 		System.out.println(JavaModelManager.getJavaModelManager().cacheToString("-> ")); //$NON-NLS-1$
 	}
 }
 /**
  * Note: a buffer with no unsaved changes can be closed by the Java Model
  * since it has a finite number of buffers allowed open at one time. If this
  * is the first time a request is being made for the buffer, an attempt is
  * made to create and fill this element's buffer. If the buffer has been
  * closed since it was first opened, the buffer is re-created.
  *
  * @see IOpenable
  */
 public IBuffer getBuffer() throws JavaModelException {
 	if (hasBuffer()) {
 		// ensure element is open
 		Object info = getElementInfo();
 		IBuffer buffer = getBufferManager().getBuffer(this);
 		if (buffer == null) {
 			// try to (re)open a buffer
 			buffer = openBuffer(null, info);
 		}
 		if (buffer instanceof NullBuffer) {
 			return null;
 		}
 		return buffer;
 	} else {
 		return null;
 	}
 }
 /**
  * Answers the buffer factory to use for creating new buffers
  * @deprecated
  */
 public IBufferFactory getBufferFactory(){
 	return getBufferManager().getDefaultBufferFactory();
 }

 /**
  * Returns the buffer manager for this element.
  */
 protected BufferManager getBufferManager() {
 	return BufferManager.getDefaultBufferManager();
 }
 /**
  * Return my underlying resource. Elements that may not have a
  * corresponding resource must override this method.
  *
  * @see IJavaElement
  */
 public IResource getCorrespondingResource() throws JavaModelException {
 	return getUnderlyingResource();
 }
 /*
  * @see IJavaElement
  */
 public IOpenable getOpenable() {
 	return this;
 }


 /**
  * @see IJavaElement
  */
 public IResource getUnderlyingResource() throws JavaModelException {
 	IResource parentResource = this.parent.getUnderlyingResource();
 	if (parentResource == null) {
 		return null;
 	}
 	int type = parentResource.getType();
 	if (type == IResource.FOLDER || type == IResource.PROJECT) {
 		IContainer folder = (IContainer) parentResource;
 		IResource resource = folder.findMember(getElementName());
 		if (resource == null) {
 			throw newNotPresentException();
 		} else {
 			return resource;
 		}
 	} else {
 		return parentResource;
 	}
 }

 /**
  * Returns true if this element may have an associated source buffer,
  * otherwise false. Subclasses must override as required.
  */
 protected boolean hasBuffer() {
 	return false;
 }
 /**
  * @see IOpenable
  */
 public boolean hasUnsavedChanges() throws JavaModelException{

 	if (isReadOnly() || !isOpen()) {
 		return false;
 	}
 	IBuffer buf = getBuffer();
 	if (buf != null && buf.hasUnsavedChanges()) {
 		return true;
 	}
 	// for package fragments, package fragment roots, and projects must check open buffers
 	// to see if they have an child with unsaved changes
 	int elementType = getElementType();
 	if (elementType == PACKAGE_FRAGMENT ||
 		elementType == PACKAGE_FRAGMENT_ROOT ||
 		elementType == JAVA_PROJECT ||
 		elementType == JAVA_MODEL) { // fix for 1FWNMHH
 		Enumeration openBuffers= getBufferManager().getOpenBuffers();
 		while (openBuffers.hasMoreElements()) {
 			IBuffer buffer= (IBuffer)openBuffers.nextElement();
 			if (buffer.hasUnsavedChanges()) {
 				IJavaElement owner= (IJavaElement)buffer.getOwner();
 				if (isAncestorOf(owner)) {
 					return true;
 				}
 			}
 		}
 	}

 	return false;
 }
 /**
  * Subclasses must override as required.
  *
  * @see IOpenable
  */
 public boolean isConsistent() {
 	return true;
 }
 /**
  *
  * @see IOpenable
  */
 public boolean isOpen() {
 	return JavaModelManager.getJavaModelManager().getInfo(this) != null;
 }
 /**
  * Returns true if this represents a source element.
  * Openable source elements have an associated buffer created
  * when they are opened.
  */
 protected boolean isSourceElement() {
 	return false;
 }
 /**
  * @see IJavaElement
  */
 public boolean isStructureKnown() throws JavaModelException {
 	return ((OpenableElementInfo)getElementInfo()).isStructureKnown();
 }
 /**
  * @see IOpenable
  */
 public void makeConsistent(IProgressMonitor monitor) throws JavaModelException {
 	// only compilation units can be inconsistent
 	// other openables cannot be inconsistent so default is to do nothing
 }
 /**
  * @see IOpenable
  */
 public void open(IProgressMonitor pm) throws JavaModelException {
 	getElementInfo(pm);
 }

 /**
  * Opens a buffer on the contents of this element, and returns
  * the buffer, or returns <code>null</code> if opening fails.
  * By default, do nothing - subclasses that have buffers
  * must override as required.
  */
 protected IBuffer openBuffer(IProgressMonitor pm, Object info) throws JavaModelException {
 	return null;
 }

 public IResource getResource() {
 	PackageFragmentRoot root = getPackageFragmentRoot();
 	if (root != null) {
 		if (root.isExternal())
 			return null;
 		if (root.isArchive())
 			return root.resource(root);
 	}
 	return resource(root);
 }

 public IResource resource() {
 	PackageFragmentRoot root = getPackageFragmentRoot();
 	if (root != null && root.isArchive())
 		return root.resource(root);
 	return resource(root);
 }

 protected abstract IResource resource(PackageFragmentRoot root);

 /**
  * Returns whether the corresponding resource or associated file exists
  */
 protected boolean resourceExists(IResource underlyingResource) {
 	return underlyingResource.isAccessible();
 }

 /**
  * @see IOpenable
  */
 public void save(IProgressMonitor pm, boolean force) throws JavaModelException {
 	if (isReadOnly()) {
 		throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.READ_ONLY, this));
 	}
 	IBuffer buf = getBuffer();
 	if (buf != null) { // some Openables (like a JavaProject) don't have a buffer
 		buf.save(pm, force);
 		makeConsistent(pm); // update the element info of this element
 	}
 }

 /**
  * Find enclosing package fragment root if any
  */
 public PackageFragmentRoot getPackageFragmentRoot() {
 	return (PackageFragmentRoot) getAncestor(IJavaElement.PACKAGE_FRAGMENT_ROOT);
 }

 /*
  * Validates the existence of this openable. Returns a non ok status if it doesn't exist.
  */
 abstract protected IStatus validateExistence(IResource underlyingResource);

 /*
  * Opens the ancestors of this openable that are not yet opened, validating their existence.
  */
 protected void openAncestors(HashMap newElements, IProgressMonitor monitor) throws JavaModelException {
 	Openable openableParent = (Openable)getOpenableParent();
 	if (openableParent != null && !openableParent.isOpen()) {
 		openableParent.generateInfos(openableParent.createElementInfo(), newElements, monitor);
 	}
 }

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2013 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.jdt.internal.core;

	import java.util.Enumeration;
	import java.util.HashMap;
	import java.util.Map;

	import org.eclipse.core.resources.*;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.PerformanceStats;
	import org.eclipse.jdt.core.*;
	import org.eclipse.jdt.internal.codeassist.CompletionEngine;
	import org.eclipse.jdt.internal.codeassist.SelectionEngine;
	import org.eclipse.jdt.internal.core.util.Util;


	/**
	* Abstract class for implementations of java elements which are IOpenable.
	*
	* @see IJavaElement
	* @see IOpenable
	*/
	@SuppressWarnings({"rawtypes"})
	public abstract class Openable extends JavaElement implements IOpenable, IBufferChangedListener {

	protected Openable(JavaElement parent) {
	super(parent);
	}
	/**
	* The buffer associated with this element has changed. Registers
	* this element as being out of synch with its buffer's contents.
	* If the buffer has been closed, this element is set as NOT out of
	* synch with the contents.
	*
	* @see IBufferChangedListener
	*/
	public void bufferChanged(BufferChangedEvent event) {
	if (event.getBuffer().isClosed()) {
	JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().remove(this);
	getBufferManager().removeBuffer(event.getBuffer());
	} else {
	JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().add(this);
	}
	}
	/**
	* Builds this element's structure and properties in the given
	* info object, based on this element's current contents (reuse buffer
	* contents if this element has an open buffer, or resource contents
	* if this element does not have an open buffer). Children
	* are placed in the given newElements table (note, this element
	* has already been placed in the newElements table). Returns true
	* if successful, or false if an error is encountered while determining
	* the structure of this element.
	*/
	protected abstract boolean buildStructure(OpenableElementInfo info, IProgressMonitor pm, Map newElements, IResource underlyingResource) throws JavaModelException;
	/*
	* Returns whether this element can be removed from the Java model cache to make space.
	*/
	public boolean canBeRemovedFromCache() {
	try {
	return !hasUnsavedChanges();
	} catch (JavaModelException e) {
	return false;
	}
	}
	/*
	* Returns whether the buffer of this element can be removed from the Java model cache to make space.
	*/
	public boolean canBufferBeRemovedFromCache(IBuffer buffer) {
	return !buffer.hasUnsavedChanges();
	}
	/**
	* Close the buffer associated with this element, if any.
	*/
	protected void closeBuffer() {
	if (!hasBuffer()) return; // nothing to do
	IBuffer buffer = getBufferManager().getBuffer(this);
	if (buffer != null) {
	buffer.close();
	buffer.removeBufferChangedListener(this);
	}
	}
	/**
	* This element is being closed. Do any necessary cleanup.
	*/
	protected void closing(Object info) {
	closeBuffer();
	}
	protected void codeComplete(
	org.eclipse.jdt.internal.compiler.env.ICompilationUnit cu,
	org.eclipse.jdt.internal.compiler.env.ICompilationUnit unitToSkip,
	int position, CompletionRequestor requestor,
	WorkingCopyOwner owner,
	ITypeRoot typeRoot,
	IProgressMonitor monitor) throws JavaModelException {
	if (requestor == null) {
	throw new IllegalArgumentException("Completion requestor cannot be null"); //$NON-NLS-1$
	}
	PerformanceStats performanceStats = CompletionEngine.PERF
	? PerformanceStats.getStats(JavaModelManager.COMPLETION_PERF, this)
	: null;
	if(performanceStats != null) {
	performanceStats.startRun(new String(cu.getFileName()) + " at " + position); //$NON-NLS-1$
	}
	IBuffer buffer = getBuffer();
	if (buffer == null) {
	return;
	}
	if (position < -1 \|\| position > buffer.getLength()) {
	throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INDEX_OUT_OF_BOUNDS));
	}
	JavaProject project = (JavaProject) getJavaProject();
	SearchableEnvironment environment = project.newSearchableNameEnvironment(owner);

	// set unit to skip
	environment.unitToSkip = unitToSkip;

	// code complete
	CompletionEngine engine = new CompletionEngine(environment, requestor, project.getOptions(true), project, owner, monitor);
	engine.complete(cu, position, 0, typeRoot);
	if(performanceStats != null) {
	performanceStats.endRun();
	}
	if (NameLookup.VERBOSE) {
	System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInSourcePackage: " + environment.nameLookup.timeSpentInSeekTypesInSourcePackage + "ms"); //$NON-NLS-1$ //$NON-NLS-2$
	System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInBinaryPackage: " + environment.nameLookup.timeSpentInSeekTypesInBinaryPackage + "ms"); //$NON-NLS-1$ //$NON-NLS-2$
	}
	}
	protected IJavaElement[] codeSelect(org.eclipse.jdt.internal.compiler.env.ICompilationUnit cu, int offset, int length, WorkingCopyOwner owner) throws JavaModelException {
	PerformanceStats performanceStats = SelectionEngine.PERF
	? PerformanceStats.getStats(JavaModelManager.SELECTION_PERF, this)
	: null;
	if(performanceStats != null) {
	performanceStats.startRun(new String(cu.getFileName()) + " at [" + offset + "," + length + "]"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	}

	JavaProject project = (JavaProject)getJavaProject();
	SearchableEnvironment environment = project.newSearchableNameEnvironment(owner);

	SelectionRequestor requestor= new SelectionRequestor(environment.nameLookup, this);
	IBuffer buffer = getBuffer();
	if (buffer == null) {
	return requestor.getElements();
	}
	int end= buffer.getLength();
	if (offset < 0 \|\| length < 0 \|\| offset + length > end ) {
	throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INDEX_OUT_OF_BOUNDS));
	}

	// fix for 1FVXGDK
	SelectionEngine engine = new SelectionEngine(environment, requestor, project.getOptions(true), owner);
	engine.select(cu, offset, offset + length - 1);

	if(performanceStats != null) {
	performanceStats.endRun();
	}
	if (NameLookup.VERBOSE) {
	System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInSourcePackage: " + environment.nameLookup.timeSpentInSeekTypesInSourcePackage + "ms"); //$NON-NLS-1$ //$NON-NLS-2$
	System.out.println(Thread.currentThread() + " TIME SPENT in NameLoopkup#seekTypesInBinaryPackage: " + environment.nameLookup.timeSpentInSeekTypesInBinaryPackage + "ms"); //$NON-NLS-1$ //$NON-NLS-2$
	}
	return requestor.getElements();
	}
	/*
	* Returns a new element info for this element.
	*/
	protected Object createElementInfo() {
	return new OpenableElementInfo();
	}
	/**
	* @see IJavaElement
	*/
	public boolean exists() {
	if (JavaModelManager.getJavaModelManager().getInfo(this) != null)
	return true;
	switch (getElementType()) {
	case IJavaElement.PACKAGE_FRAGMENT:
	PackageFragmentRoot root = getPackageFragmentRoot();
	if (root.isArchive()) {
	// pkg in a jar -> need to open root to know if this pkg exists
	JarPackageFragmentRootInfo rootInfo;
	try {
	rootInfo = (JarPackageFragmentRootInfo) root.getElementInfo();
	} catch (JavaModelException e) {
	return false;
	}
	return rootInfo.rawPackageInfo.containsKey(((PackageFragment) this).names);
	}
	break;
	case IJavaElement.CLASS_FILE:
	if (getPackageFragmentRoot().isArchive()) {
	// class file in a jar -> need to open this class file to know if it exists
	return super.exists();
	}
	break;
	}
	return validateExistence(resource()).isOK();
	}
	public String findRecommendedLineSeparator() throws JavaModelException {
	IBuffer buffer = getBuffer();
	String source = buffer == null ? null : buffer.getContents();
	return Util.getLineSeparator(source, getJavaProject());
	}
	protected void generateInfos(Object info, HashMap newElements, IProgressMonitor monitor) throws JavaModelException {

	if (JavaModelCache.VERBOSE){
	String element;
	switch (getElementType()) {
	case JAVA_PROJECT:
	element = "project"; //$NON-NLS-1$
	break;
	case PACKAGE_FRAGMENT_ROOT:
	element = "root"; //$NON-NLS-1$
	break;
	case PACKAGE_FRAGMENT:
	element = "package"; //$NON-NLS-1$
	break;
	case CLASS_FILE:
	element = "class file"; //$NON-NLS-1$
	break;
	case COMPILATION_UNIT:
	element = "compilation unit"; //$NON-NLS-1$
	break;
	default:
	element = "element"; //$NON-NLS-1$
	}
	System.out.println(Thread.currentThread() +" OPENING " + element + " " + this.toStringWithAncestors()); //$NON-NLS-1$//$NON-NLS-2$
	}

	// open its ancestors if needed
	openAncestors(newElements, monitor);

	// validate existence
	IResource underlResource = resource();
	IStatus status = validateExistence(underlResource);
	if (!status.isOK())
	throw newJavaModelException(status);

	if (monitor != null && monitor.isCanceled())
	throw new OperationCanceledException();

	// puts the info before building the structure so that questions to the handle behave as if the element existed
	// (case of compilation units becoming working copies)
	newElements.put(this, info);

	// build the structure of the openable (this will open the buffer if needed)
	try {
	OpenableElementInfo openableElementInfo = (OpenableElementInfo)info;
	boolean isStructureKnown = buildStructure(openableElementInfo, monitor, newElements, underlResource);
	openableElementInfo.setIsStructureKnown(isStructureKnown);
	} catch (JavaModelException e) {
	newElements.remove(this);
	throw e;
	}

	// remove out of sync buffer for this element
	JavaModelManager.getJavaModelManager().getElementsOutOfSynchWithBuffers().remove(this);

	if (JavaModelCache.VERBOSE) {
	System.out.println(JavaModelManager.getJavaModelManager().cacheToString("-> ")); //$NON-NLS-1$
	}
	}
	/**
	* Note: a buffer with no unsaved changes can be closed by the Java Model
	* since it has a finite number of buffers allowed open at one time. If this
	* is the first time a request is being made for the buffer, an attempt is
	* made to create and fill this element's buffer. If the buffer has been
	* closed since it was first opened, the buffer is re-created.
	*
	* @see IOpenable
	*/
	public IBuffer getBuffer() throws JavaModelException {
	if (hasBuffer()) {
	// ensure element is open
	Object info = getElementInfo();
	IBuffer buffer = getBufferManager().getBuffer(this);
	if (buffer == null) {
	// try to (re)open a buffer
	buffer = openBuffer(null, info);
	}
	if (buffer instanceof NullBuffer) {
	return null;
	}
	return buffer;
	} else {
	return null;
	}
	}
	/**
	* Answers the buffer factory to use for creating new buffers
	* @deprecated
	*/
	public IBufferFactory getBufferFactory(){
	return getBufferManager().getDefaultBufferFactory();
	}

	/**
	* Returns the buffer manager for this element.
	*/
	protected BufferManager getBufferManager() {
	return BufferManager.getDefaultBufferManager();
	}
	/**
	* Return my underlying resource. Elements that may not have a
	* corresponding resource must override this method.
	*
	* @see IJavaElement
	*/
	public IResource getCorrespondingResource() throws JavaModelException {
	return getUnderlyingResource();
	}
	/*
	* @see IJavaElement
	*/
	public IOpenable getOpenable() {
	return this;
	}



	/**
	* @see IJavaElement
	*/
	public IResource getUnderlyingResource() throws JavaModelException {
	IResource parentResource = this.parent.getUnderlyingResource();
	if (parentResource == null) {
	return null;
	}
	int type = parentResource.getType();
	if (type == IResource.FOLDER \|\| type == IResource.PROJECT) {
	IContainer folder = (IContainer) parentResource;
	IResource resource = folder.findMember(getElementName());
	if (resource == null) {
	throw newNotPresentException();
	} else {
	return resource;
	}
	} else {
	return parentResource;
	}
	}

	/**
	* Returns true if this element may have an associated source buffer,
	* otherwise false. Subclasses must override as required.
	*/
	protected boolean hasBuffer() {
	return false;
	}
	/**
	* @see IOpenable
	*/
	public boolean hasUnsavedChanges() throws JavaModelException{

	if (isReadOnly() \|\| !isOpen()) {
	return false;
	}
	IBuffer buf = getBuffer();
	if (buf != null && buf.hasUnsavedChanges()) {
	return true;
	}
	// for package fragments, package fragment roots, and projects must check open buffers
	// to see if they have an child with unsaved changes
	int elementType = getElementType();
	if (elementType == PACKAGE_FRAGMENT \|\|
	elementType == PACKAGE_FRAGMENT_ROOT \|\|
	elementType == JAVA_PROJECT \|\|
	elementType == JAVA_MODEL) { // fix for 1FWNMHH
	Enumeration openBuffers= getBufferManager().getOpenBuffers();
	while (openBuffers.hasMoreElements()) {
	IBuffer buffer= (IBuffer)openBuffers.nextElement();
	if (buffer.hasUnsavedChanges()) {
	IJavaElement owner= (IJavaElement)buffer.getOwner();
	if (isAncestorOf(owner)) {
	return true;
	}
	}
	}
	}

	return false;
	}
	/**
	* Subclasses must override as required.
	*
	* @see IOpenable
	*/
	public boolean isConsistent() {
	return true;
	}
	/**
	*
	* @see IOpenable
	*/
	public boolean isOpen() {
	return JavaModelManager.getJavaModelManager().getInfo(this) != null;
	}
	/**
	* Returns true if this represents a source element.
	* Openable source elements have an associated buffer created
	* when they are opened.
	*/
	protected boolean isSourceElement() {
	return false;
	}
	/**
	* @see IJavaElement
	*/
	public boolean isStructureKnown() throws JavaModelException {
	return ((OpenableElementInfo)getElementInfo()).isStructureKnown();
	}
	/**
	* @see IOpenable
	*/
	public void makeConsistent(IProgressMonitor monitor) throws JavaModelException {
	// only compilation units can be inconsistent
	// other openables cannot be inconsistent so default is to do nothing
	}
	/**
	* @see IOpenable
	*/
	public void open(IProgressMonitor pm) throws JavaModelException {
	getElementInfo(pm);
	}

	/**
	* Opens a buffer on the contents of this element, and returns
	* the buffer, or returns <code>null</code> if opening fails.
	* By default, do nothing - subclasses that have buffers
	* must override as required.
	*/
	protected IBuffer openBuffer(IProgressMonitor pm, Object info) throws JavaModelException {
	return null;
	}

	public IResource getResource() {
	PackageFragmentRoot root = getPackageFragmentRoot();
	if (root != null) {
	if (root.isExternal())
	return null;
	if (root.isArchive())
	return root.resource(root);
	}
	return resource(root);
	}

	public IResource resource() {
	PackageFragmentRoot root = getPackageFragmentRoot();
	if (root != null && root.isArchive())
	return root.resource(root);
	return resource(root);
	}

	protected abstract IResource resource(PackageFragmentRoot root);

	/**
	* Returns whether the corresponding resource or associated file exists
	*/
	protected boolean resourceExists(IResource underlyingResource) {
	return underlyingResource.isAccessible();
	}

	/**
	* @see IOpenable
	*/
	public void save(IProgressMonitor pm, boolean force) throws JavaModelException {
	if (isReadOnly()) {
	throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.READ_ONLY, this));
	}
	IBuffer buf = getBuffer();
	if (buf != null) { // some Openables (like a JavaProject) don't have a buffer
	buf.save(pm, force);
	makeConsistent(pm); // update the element info of this element
	}
	}

	/**
	* Find enclosing package fragment root if any
	*/
	public PackageFragmentRoot getPackageFragmentRoot() {
	return (PackageFragmentRoot) getAncestor(IJavaElement.PACKAGE_FRAGMENT_ROOT);
	}

	/*
	* Validates the existence of this openable. Returns a non ok status if it doesn't exist.
	*/
	abstract protected IStatus validateExistence(IResource underlyingResource);

	/*
	* Opens the ancestors of this openable that are not yet opened, validating their existence.
	*/
	protected void openAncestors(HashMap newElements, IProgressMonitor monitor) throws JavaModelException {
	Openable openableParent = (Openable)getOpenableParent();
	if (openableParent != null && !openableParent.isOpen()) {
	openableParent.generateInfos(openableParent.createElementInfo(), newElements, monitor);
	}
	}

	}