/*******************************************************************************
* Copyright (c) 2007 Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is 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:
* Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.model.ui.attribute.adapter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.ListIterator;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.CompletionProposal;
import org.eclipse.jdt.core.CompletionRequestor;
import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.search.IJavaSearchConstants;
import org.eclipse.jface.fieldassist.ContentProposalAdapter;
import org.eclipse.jface.fieldassist.IContentProposal;
import org.eclipse.jface.fieldassist.IContentProposalProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.pde.internal.ui.PDEPluginImages;
import org.eclipse.pde.internal.ui.editor.contentassist.TypeContentProposal;
import org.eclipse.pde.internal.ui.editor.contentassist.TypePackageCompletionProcessor;
import org.eclipse.swt.graphics.Image;
import org.jboss.tools.common.meta.XAttribute;
import org.jboss.tools.common.meta.action.XEntityData;
import org.jboss.tools.common.model.XModelObject;
import org.jboss.tools.common.model.ui.ModelUIPlugin;
import org.jboss.tools.common.model.ui.attribute.IAttributeContentProposalProvider;
import org.jboss.tools.common.model.ui.attribute.IValueFilter;
import org.jboss.tools.common.model.ui.attribute.editor.JavaHyperlinkCueLabelProvider;
import org.jboss.tools.common.model.util.ModelFeatureFactory;
public class JavaClassContentAssistProvider implements
IAttributeContentProposalProvider {
XModelObject object;
XAttribute attribute;
IValueFilter valueFilter = null;
public IContentProposalProvider getContentProposalProvider() {
IProject project = (IProject)object.getModel().getProperties().get("project"); //$NON-NLS-1$
return (project == null) ? null : new TypeContentProposalProvider(project, IJavaSearchConstants.TYPE, valueFilter);
}
public int getProposalAcceptanceStyle() {
return ContentProposalAdapter.PROPOSAL_REPLACE;
}
public void init(XModelObject object, XEntityData data, XAttribute attribute) {
this.object = object;
this.attribute = attribute;
createValueFilter();
}
void createValueFilter() {
if(attribute == null) return;
String cls = attribute.getProperty("valueFilter");
if(cls == null || cls.length() == 0) return;
try {
valueFilter = (IValueFilter)ModelFeatureFactory.getInstance().createFeatureInstance(cls);
} catch (ClassCastException exc) {
ModelUIPlugin.getPluginLog().logError(exc);
}
if(valueFilter != null) {
if(!valueFilter.init(object, attribute)) {
valueFilter = null;
}
}
}
public boolean isRelevant(XModelObject object, XAttribute attribute) {
if(object == null || attribute == null) return false;
String editorName = attribute.getEditor().getName();
return editorName != null && editorName.indexOf("AccessibleJava") >= 0; //$NON-NLS-1$
}
public LabelProvider getCustomLabelProbider() {
return JavaHyperlinkCueLabelProvider.INSTANCE;
}
public void dispose() {
this.object = null;
this.attribute = null;
}
}
class TypeContentProposalProvider extends TypePackageCompletionProcessor implements IContentProposalProvider {
public static final char F_DOT = '.';
private IProject fProject;
private int fTypeScope;
private ArrayList fInitialContentProposals;
private String fInitialContent;
private Comparator fComparator;
IValueFilter valueFilter;
/**
*
*/
public TypeContentProposalProvider(IProject project, int scope, IValueFilter valueFilter) {
fProject = project;
fTypeScope = scope;
fComparator = new TypeComparator();
this.valueFilter = valueFilter;
reset();
}
/**
* TypeComparator
*
*/
private static class TypeComparator implements Comparator {
/**
*
*/
public TypeComparator() {
// NO-OP
}
/* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(Object arg0, Object arg1) {
String proposalSortKey1 = ((IContentProposal) arg0).getLabel();
String proposalSortKey2 = ((IContentProposal) arg1).getLabel();
return proposalSortKey1.compareToIgnoreCase(proposalSortKey2);
}
}
/* (non-Javadoc)
* @see org.eclipse.jface.fieldassist.IContentProposalProvider#getProposals(java.lang.String, int)
*/
public IContentProposal[] getProposals(String contents, int position) {
// Generate a list of proposals based on the current contents
ArrayList currentContentProposals = null;
// Determine method to obtain proposals based on current field contents
if (position == 0) {
// If the document offset is at the 0 position (i.e. no input entered),
// do not perform content assist. The operation is too expensive
// because all classes and interfaces (depending on the specified scope)
// will need to be resolved as proposals
currentContentProposals = null;
} else if ((fInitialContentProposals == null) || (!contents.startsWith(fInitialContent)) || (endsWithDot(contents))) {
// Generate new proposals if the content assist session was just
// started
// Or generate new proposals if the current contents of the field
// is less than the initial contents of the field used to
// generate the original proposals; thus, widening the search
// scope. This can occur when the user types backspace
// Or generate new proposals if the current contents ends with a
// dot
currentContentProposals = generateContentProposals(contents.substring(0, position));
} else {
// Filter existing proposals from a prevous search; thus, narrowing
// the search scope. This can occur when the user types additional
// characters in the field causing new characters to be appended to
// the initial field contents
currentContentProposals = filterContentProposals(contents);
}
currentContentProposals = filterContentProposalsByValueFilter(currentContentProposals);
return convertResultsToSortedProposals(currentContentProposals);
}
/**
*
*/
public void reset() {
fInitialContentProposals = null;
}
/* (non-Javadoc)
* @see org.eclipse.pde.internal.ui.editor.contentassist.TypePackageCompletionProcessor#addProposalToCollection(java.util.Collection, int, int, java.lang.String, java.lang.String, org.eclipse.swt.graphics.Image)
*/
protected void addProposalToCollection(Collection collection, int startOffset, int length, String label, String content, Image image) {
// Create content proposals for field assist
// start offset and length not required
IContentProposal proposal = new TypeContentProposal(label, content, null, image);
// Add the proposal to the list of proposals
collection.add(proposal);
}
/**
* @param string
* @return
*/
private boolean endsWithDot(String string) {
int index = string.lastIndexOf(F_DOT);
if ((index + 1) == string.length()) {
return true;
}
return false;
}
/**
* @param currentContent
* @return
*/
private ArrayList generateContentProposals(String currentContent) {
fInitialContentProposals = new ArrayList();
// Store the initial field contents to determine if we need to
// widen the scope later
fInitialContent = currentContent;
generateTypePackageProposals(currentContent, fProject, fInitialContentProposals, 0, fTypeScope, true);
return fInitialContentProposals;
}
/**
* @param list
* @return
*/
private IContentProposal[] convertResultsToSortedProposals(ArrayList list) {
IContentProposal[] proposals = null;
if ((list != null) && (list.size() != 0)) {
// Convert the results array list into an array of completion
// proposals
proposals = (IContentProposal[]) list.toArray(new IContentProposal[list.size()]);
// Sort the proposals alphabetically
Arrays.sort(proposals, fComparator);
} else {
proposals = new IContentProposal[0];
}
return proposals;
}
/**
* @param currentContent
* @return
*/
private ArrayList filterContentProposals(String currentContent) {
String lowerCaseCurrentContent = currentContent.toLowerCase();
ListIterator iterator = fInitialContentProposals.listIterator();
// Maintain a list of filtered search results
ArrayList filteredContentProposals = new ArrayList();
// Iterate over the initial search results
while (iterator.hasNext()) {
Object object = iterator.next();
IContentProposal proposal = (IContentProposal) object;
String compareString = null;
if (lowerCaseCurrentContent.indexOf(F_DOT) == -1) {
// Use only the type name
compareString = proposal.getLabel().toLowerCase();
} else {
// Use the fully qualified type name
compareString = proposal.getContent().toLowerCase();
}
// Filter out any proposal not matching the current contents
// except for the edge case where the proposal is identical to the
// current contents
if (compareString.startsWith(lowerCaseCurrentContent, 0)) {
filteredContentProposals.add(proposal);
}
}
return filteredContentProposals;
}
private ArrayList filterContentProposalsByValueFilter(ArrayList filteredContentProposals) {
if(valueFilter != null && filteredContentProposals != null /*&& filteredContentProposals.size() < 200*/) {
ArrayList filteredContentProposals2 = new ArrayList();
ListIterator iterator = filteredContentProposals.listIterator();
while (iterator.hasNext()) {
Object object = iterator.next();
IContentProposal proposal = (IContentProposal) object;
String value = proposal.getContent();
if(valueFilter.accept(value)) {
filteredContentProposals2.add(proposal);
}
}
filteredContentProposals = filteredContentProposals2;
}
return filteredContentProposals;
}
protected void generateTypePackageProposals(String currentContent, IProject project, Collection c, int startOffset, int typeScope, boolean replaceEntireContents) {
currentContent = removeLeadingSpaces(currentContent);
if (c == null || currentContent.length() == 0)
return;
int length = (replaceEntireContents) ? -1 : currentContent.length();
generateProposals(currentContent, project, c, startOffset, length, typeScope);
}
private void generateProposals(String currentContent, IProject project, final Collection c, final int startOffset, final int length, final int typeScope) {
class TypePackageCompletionRequestor extends CompletionRequestor {
public TypePackageCompletionRequestor() {
super(true);
setIgnored(CompletionProposal.PACKAGE_REF, false);
setIgnored(CompletionProposal.TYPE_REF, false);
}
public void accept(CompletionProposal proposal) {
if (proposal.getKind() == CompletionProposal.PACKAGE_REF) {
String pkgName = new String(proposal.getCompletion());
addProposalToCollection(c, startOffset, length, pkgName, pkgName, PDEPluginImages.get(PDEPluginImages.OBJ_DESC_PACKAGE));
} else {
boolean isInterface = Flags.isInterface(proposal.getFlags());
String completion = new String(proposal.getCompletion());
if (isInterface && typeScope == IJavaSearchConstants.CLASS || (!isInterface && typeScope == IJavaSearchConstants.INTERFACE) || completion.equals("Dummy2")) //$NON-NLS-1$
// don't want Dummy class showing up as option.
return;
int period = completion.lastIndexOf('.');
String cName = null, pName = null;
if (period == -1) {
cName = completion;
} else {
cName = completion.substring(period + 1);
pName = completion.substring(0, period);
}
if(pName == null) {
char[] declaration = proposal.getDeclarationSignature();
pName = declaration == null || declaration.length == 0 ? "(default)" : new String(declaration);
}
Image image = isInterface ? PDEPluginImages.get(PDEPluginImages.OBJ_DESC_GENERATE_INTERFACE) : PDEPluginImages.get(PDEPluginImages.OBJ_DESC_GENERATE_CLASS);
addProposalToCollection(c, startOffset, length, cName + " - " + pName, //$NON-NLS-1$
completion, image);
}
}
}
try {
ICompilationUnit unit = getWorkingCopy(project);
if (unit == null) {
generateTypeProposals(currentContent, project, c, startOffset, length, 1);
return;
}
IBuffer buff = unit.getBuffer();
buff.setContents("class Dummy2 { " + currentContent); //$NON-NLS-1$
CompletionRequestor req = new TypePackageCompletionRequestor();
unit.codeComplete(15 + currentContent.length(), req);
unit.discardWorkingCopy();
} catch (JavaModelException e) {
ModelUIPlugin.getPluginLog().logError(e);
}
}
private ICompilationUnit getWorkingCopy(IProject project) throws JavaModelException {
IPackageFragmentRoot[] roots = JavaCore.create(project).getPackageFragmentRoots();
if (roots.length > 0) {
IPackageFragment frag = null;
for (int i = 0; i < roots.length; i++)
if (roots[i].getKind() == IPackageFragmentRoot.K_SOURCE || project.equals(roots[i].getCorrespondingResource()) || (roots[i].isArchive() && !roots[i].isExternal())) {
IJavaElement[] elems = roots[i].getChildren();
if ((elems.length > 0) && (i < elems.length) && (elems[i] instanceof IPackageFragment)) {
frag = (IPackageFragment) elems[i];
break;
}
}
if (frag != null)
return frag.getCompilationUnit("Dummy2.java").getWorkingCopy(new NullProgressMonitor()); //$NON-NLS-1$
}
return null;
}
}