/*
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.eclipse.flow.ruleflow.view.property.constraint;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import org.drools.compiler.lang.descr.GlobalDescr;
import org.drools.eclipse.DroolsEclipsePlugin;
import org.drools.eclipse.editors.completion.CompletionUtil;
import org.drools.eclipse.editors.completion.DefaultCompletionProcessor;
import org.drools.eclipse.editors.completion.RuleCompletionProcessor;
import org.drools.eclipse.editors.completion.RuleCompletionProposal;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
/**
* Completion for ruleflow constraints.
*/
public class ImportCompletionProcessor extends DefaultCompletionProcessor {
public ImportCompletionProcessor() {
super(null);
}
public IEditorPart getEditor() {
IWorkbench workbench = PlatformUI.getWorkbench();
if (workbench != null) {
IWorkbenchWindow workbenchWindow = workbench.getActiveWorkbenchWindow();
if (workbenchWindow != null) {
IWorkbenchPage workbenchPage = workbenchWindow.getActivePage();
if (workbenchPage != null) {
return workbenchPage.getActiveEditor();
}
}
}
return null;
}
protected List<ICompletionProposal> getCompletionProposals(ITextViewer viewer,
int documentOffset) {
try {
IDocument doc = viewer.getDocument();
String backText = readBackwards(documentOffset, doc);
String prefix = CompletionUtil.stripLastWord(backText);
List<ICompletionProposal> props = null;
Matcher matcher = IMPORT_PATTERN.matcher(backText);
if (matcher.matches()) {
String classNameStart = backText.substring(backText
.lastIndexOf("import") + 7);
props = getAllClassProposals(classNameStart, documentOffset,
prefix);
} else {
props = getPossibleProposals(viewer, documentOffset, backText, prefix);
}
return props;
} catch (Throwable t) {
DroolsEclipsePlugin.log(t);
}
return null;
}
public List<String> getImports() {
return Collections.emptyList();
}
public List<GlobalDescr> getGlobals() {
return Collections.emptyList();
}
protected IJavaProject getCurrentJavaProject() {
IEditorPart editor = getEditor();
if (editor != null && editor.getEditorInput() instanceof IFileEditorInput) {
IFile file = ((IFileEditorInput) editor.getEditorInput()).getFile();
try {
if (file.getProject().getNature("org.eclipse.jdt.core.javanature") != null) {
return JavaCore.create(file.getProject());
}
} catch (CoreException e) {
// do nothing
}
}
return null;
}
protected List<ICompletionProposal> getPossibleProposals(ITextViewer viewer,
int documentOffset,
String backText,
final String prefix) {
List<ICompletionProposal> list = new ArrayList<ICompletionProposal>();
list.add(new RuleCompletionProposal(documentOffset - prefix.length(), prefix.length(), "import", "import "));
DefaultCompletionProcessor.filterProposalsOnPrefix(prefix, list);
return list;
}
/**
* @return a list of "MVELified" RuleCompletionProposal. That list contains only unique proposal based on
* the overrriden equals in {@link RuleCompletionProposal} to avoid the situation when several
* accessors can exist for one property. for that case we want to keep only one proposal.
*/
protected Collection<ICompletionProposal> getJavaMvelCompletionProposals(final int documentOffset,
final String javaText,
final String prefix,
Map<String, String> params) {
final List<ICompletionProposal> list = new ArrayList<ICompletionProposal>();
requestJavaCompletionProposals( javaText,
prefix,
documentOffset,
params,
list );
Collection<ICompletionProposal> mvelList = RuleCompletionProcessor.mvelifyProposals( list, false );
return mvelList;
}
}