/**
* Copyright 2010 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.rulebuilder.editors;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.drools.compiler.DrlParser;
import org.drools.eclipse.DroolsEclipsePlugin;
import org.drools.eclipse.dsl.editor.DSLAdapter;
import org.drools.eclipse.editors.DRLDocumentProvider;
import org.drools.eclipse.editors.DRLRuleEditor;
import org.drools.eclipse.util.ProjectClassLoader;
import org.drools.ide.common.client.modeldriven.SuggestionCompletionEngine;
import org.drools.ide.common.server.rules.SuggestionCompletionLoader;
import org.drools.ide.common.server.util.BRDRLPersistence;
import org.drools.ide.common.server.util.BRXMLPersistence;
import org.drools.lang.dsl.DSLTokenizedMappingFile;
import org.eclipse.core.internal.resources.Container;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.editors.text.TextEditor;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.ide.ResourceUtil;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.texteditor.DocumentProviderRegistry;
import org.eclipse.ui.texteditor.IDocumentProvider;
public class RuleEditor extends FormEditor
implements
IResourceChangeListener {
private BrlPage guidedEditor;
private TextEditor xmlEditor = new TextEditor();
private SuggestionCompletionEngine completion;
private SuggestionCompletionLoader loader;
private FileEditorInput packageEditorInput;
private final Document drlDocument;
private IResourceChangeListener packageFileTracker = new IResourceChangeListener() {
public void resourceChanged(IResourceChangeEvent event) {
if (packageEditorInput != null) {
IResourceDelta delta = getRootDelta( event.getDelta() );
IPath p1 = delta.getFullPath();
IPath p2 = packageEditorInput.getFile().getFullPath();
if ( p1.equals( p2 ) ) {
reloadCompletionEngine();
}
} }
};
public RuleEditor() {
super();
ResourcesPlugin.getWorkspace().addResourceChangeListener( this );
ResourcesPlugin.getWorkspace().addResourceChangeListener( packageFileTracker,
IResourceChangeEvent.POST_CHANGE );
drlDocument = new Document();
}
protected FormToolkit createToolkit(Display display) {
// Create a toolkit that shares colors between editors.
return new FormToolkit( DroolsEclipsePlugin.getDefault().getRuleBuilderFormColors( display ) );
}
protected void addPages() {
guidedEditor = new BrlPage( this );
try {
addPage( guidedEditor );
addPage( xmlEditor,
getEditorInput() );
DRLRuleEditor drlEditor = new DRLRuleEditor() {
protected IDocumentProvider createDocumentProvider() {
return new DRLDocumentProvider() {
public boolean isReadOnly(Object element) {
return true;
}
public boolean isModifiable(Object element) {
return false;
}
protected IDocument getParentDocument(Object element) {
return drlDocument;
}
};
}
};
addPage( drlEditor,
xmlEditor.getEditorInput() );
IPath packagePath = getCurrentDirectoryPath( getEditorInput() );
if (packagePath != null) {
packagePath = packagePath.append( "drools.package" );
IFile file = ResourcesPlugin.getWorkspace().getRoot().getFile( packagePath );
IJavaProject javaProject = JavaCore.create( file.getProject() );
ClassLoader classLoader = ProjectClassLoader.getProjectClassLoader( javaProject );
loader = new SuggestionCompletionLoader( classLoader );
if ( !file.exists() ) {
String defaultHeader = "//This is a package configuration file";
defaultHeader += "\n//Add imports, globals etc here which will be used by all the rule assets in this folder.";
InputStream is = new ByteArrayInputStream( defaultHeader.getBytes() );
try {
file.create( is,
true,
null );
} catch ( CoreException e ) {
DroolsEclipsePlugin.log( e );
}
}
packageEditorInput = new FileEditorInput( file );
}
reloadCompletionEngine();
setPageText( 1,
"BRL Source" );
setPageText( 2,
"Generated DRL (read-only)" );
updateName( false );
} catch ( PartInitException e ) {
DroolsEclipsePlugin.log( e );
}
}
private void updateName(boolean forced) {
String name = xmlEditor.getTitle();
setPartName( name );
//TODO Add support for other than .brl extensions
if ( guidedEditor.getModeller() != null && guidedEditor.getModeller().getModel() != null && (guidedEditor.getModeller().getModel().name == null || forced) ) {
String shortName = name.substring( 0,
name.length() - ".brl".length() );
guidedEditor.getModeller().getModel().name = shortName;
}
updateDRLPage();
}
private IPath getCurrentDirectoryPath(IEditorInput editorInput) {
if (editorInput instanceof FileEditorInput) {
return ((FileEditorInput) editorInput).getFile().getFullPath().removeLastSegments( 1 ).addTrailingSeparator();
}
return null;
}
private void reloadCompletionEngine() {
if (packageEditorInput == null) {
completion = new SuggestionCompletionLoader( null ).getSuggestionEngine( "",
new ArrayList(),
new ArrayList() );
return;
}
try {
// Load all .dsl files from current dir
IPath p = (packageEditorInput).getFile().getFullPath().removeLastSegments( 1 );
Container folder = (Container) ResourcesPlugin.getWorkspace().getRoot().findMember( p, false );
IResource[] files = folder.members( false );
List dslList = new ArrayList();
List enumList = new ArrayList();
for ( int i = 0; i < files.length; i++ ) {
String fn = files[i].getName();
if ( fn.endsWith( ".dsl" ) ) {
String contents = getFileContents( (IFile) files[i] );
DSLTokenizedMappingFile dsl = new DSLTokenizedMappingFile();
if ( dsl.parseAndLoad( new StringReader( contents ) ) ) {
dslList.add( dsl );
} else {
//TODO report dsl parse error
}
} else if ( fn.endsWith( ".enumeration" ) ) {
String contents = getFileContents( (IFile) files[i] );
enumList.add(contents);
}
}
// Load suggestion engine
String str = getFileContents( packageEditorInput.getFile() );
completion = loader.getSuggestionEngine( str,
Collections.EMPTY_LIST,
dslList,
enumList);
} catch ( Exception e ) {
DroolsEclipsePlugin.log( e );
}
}
private String getFileContents(IFile file) {
InputStream is;
try {
is = file.getContents();
StringBuffer out = new StringBuffer();
byte[] b = new byte[4096];
for ( int n; (n = is.read( b )) != -1; ) {
out.append( new String( b,
0,
n ) );
}
return out.toString();
} catch ( CoreException e ) {
//TODO Report problem with the file loading
return "";
} catch ( IOException e ) {
//TODO Report problem with the file loading
return "";
}
}
public boolean isDirty() {
return xmlEditor.isDirty() || guidedEditor.isDirty();
}
protected void pageChange(int newPageIndex) {
super.pageChange( newPageIndex );
IDocument document = getInputDocument();
if ( newPageIndex == 0 ) {
boolean newModel = guidedEditor.getModeller().getModel() == null;
if ( xmlEditor.isDirty() || newModel ) {
guidedEditor.setModelXML( document.get() );
if ( newModel ) {
guidedEditor.getModeller().setDirty( false );
}
updateName( false );
}
guidedEditor.refresh();
} else if ( newPageIndex == 1 ) {
if ( guidedEditor.isDirty() ) {
document.set( BRXMLPersistence.getInstance().marshal( guidedEditor.getRuleModel() ) );
}
} else if ( newPageIndex == 2 ) {
//Updating main document for proper workflow when page is switched back to "0"
if ( guidedEditor.isDirty() ) {
document.set( BRXMLPersistence.getInstance().marshal( guidedEditor.getRuleModel() ) );
} else if ( xmlEditor.isDirty() ) {
guidedEditor.setModelXML( document.get() );
}
updateDRLPage();
updateName( false );
}
}
private void updateDRLPage() {
String drl = "";
try {
drl = BRDRLPersistence.getInstance().marshal( guidedEditor.getRuleModel() );
IResource resource = ResourceUtil.getResource( xmlEditor.getEditorInput() );
Reader reader = DSLAdapter.getDSLContent( drl,
resource );
DrlParser parser = new DrlParser();
if ( reader != null ) {
drl = parser.getExpandedDRL( drl,
reader );
}
} catch ( Throwable t ) {
StringWriter strwriter = new StringWriter();
t.printStackTrace( new PrintWriter( strwriter ) );
drl = "\nPROBLEM WITH THE DRL CONVERSION!\n\n\nDRL:\n" + drl + "\n\nSTACKTRACE:\n" + strwriter.toString();
}
drlDocument.set( drl );
}
public void doSave(IProgressMonitor monitor) {
IDocument document = getInputDocument();
if ( xmlEditor.isDirty() ) {
guidedEditor.setModelXML( document.get() );
} else if ( guidedEditor.isDirty() ) {
document.set( BRXMLPersistence.getInstance().marshal( guidedEditor.getRuleModel() ) );
}
xmlEditor.doSave( monitor );
guidedEditor.getModeller().setDirty( false );
guidedEditor.refresh();
}
private IDocument getInputDocument() {
IEditorInput input = getEditorInput();
IDocumentProvider docProvider = DocumentProviderRegistry.getDefault().getDocumentProvider( input );
IDocument document = docProvider.getDocument( input );
return document;
}
public void doSaveAs() {
xmlEditor.doSaveAs();
guidedEditor.getModeller().setDirty( false );
updateName( true );
setInput( xmlEditor.getEditorInput() );
guidedEditor.refresh();
}
public boolean isSaveAsAllowed() {
return true;
}
public void resourceChanged(final IResourceChangeEvent event) {
if ( event.getType() == IResourceChangeEvent.PRE_CLOSE ) {
Display.getDefault().asyncExec( new Runnable() {
public void run() {
IWorkbenchPage[] pages = getSite().getWorkbenchWindow().getPages();
for ( int i = 0; i < pages.length; i++ ) {
if ( ((FileEditorInput) xmlEditor.getEditorInput()).getFile().getProject().equals( event.getResource() ) ) {
IEditorPart editorPart = pages[i].findEditor( xmlEditor.getEditorInput() );
pages[i].closeEditor( editorPart,
true );
}
}
}
} );
}
}
public void dispose() {
ResourcesPlugin.getWorkspace().removeResourceChangeListener( this );
ResourcesPlugin.getWorkspace().removeResourceChangeListener( packageFileTracker );
super.dispose();
}
public void dirtyPropertyChanged() {
firePropertyChange( IEditorPart.PROP_DIRTY );
guidedEditor.refresh();
}
public SuggestionCompletionEngine getCompletionEngine() {
return completion;
}
private IResourceDelta getRootDelta(IResourceDelta delta) {
if ( delta.getAffectedChildren().length > 0 ) {
return getRootDelta( delta.getAffectedChildren()[0] );
}
return delta;
}
}