/*
* 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.Collections;
import java.util.List;
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.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 GlobalCompletionProcessor extends DefaultCompletionProcessor {
public GlobalCompletionProcessor() {
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);
return getPossibleProposals(viewer, documentOffset, backText, prefix);
} 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(), "global", "global "));
DefaultCompletionProcessor.filterProposalsOnPrefix(prefix, list);
return list;
}
}