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/*******************************************************************************
* Copyright (c) 2001, 2004 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
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.tasks;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.core.runtime.content.IContentTypeManager;
import org.eclipse.wst.sse.core.internal.Logger;
import org.eclipse.wst.sse.core.internal.SSECorePlugin;
import org.eclipse.wst.sse.core.internal.provisional.tasks.IFileTaskScanner;
import org.eclipse.wst.sse.core.internal.util.StringUtils;
public class FileTaskScannerRegistryReader {
private class ScannerInfo {
String fId;
IFileTaskScanner fScanner;
ScannerInfo(String id, IFileTaskScanner scanner) {
super();
fId = id;
fScanner = scanner;
}
public boolean equals(Object obj) {
return obj instanceof ScannerInfo && fId.equals(((ScannerInfo) obj).fId);
}
public String getId() {
return fId;
}
public IFileTaskScanner getScanner() {
return fScanner;
}
}
private static FileTaskScannerRegistryReader _instance = null;
public static FileTaskScannerRegistryReader getInstance() {
if (_instance == null) {
_instance = new FileTaskScannerRegistryReader();
}
return _instance;
}
private String ATT_CLASS = "class"; //$NON-NLS-1$
private String ATT_CONTENT_TYPES = "contentTypeIds"; //$NON-NLS-1$
private String ATT_ID = "id"; //$NON-NLS-1$
private IConfigurationElement[] fScannerElements;
// a mapping from content types to ScannerInfo instances
private Map fScannerInfos = null;
private String NAME_SCANNER = "scanner"; //$NON-NLS-1$
private String SCANNER_EXTENSION_POINT_ID = SSECorePlugin.ID + ".taskscanner"; //$NON-NLS-1$
private FileTaskScannerRegistryReader() {
super();
}
IFileTaskScanner[] getFileTaskScanners(IContentType[] contentTypes) {
if (fScannerElements == null) {
readRegistry();
}
List scannerInfos = new ArrayList(1);
for (int i = 0; i < contentTypes.length; i++) {
ScannerInfo[] scannerInfosForContentType = (ScannerInfo[]) fScannerInfos.get(contentTypes[i].getId());
if (scannerInfosForContentType == null) {
scannerInfosForContentType = loadScanners(contentTypes[i]);
}
// only add non-duplicate scanners
for (int j = 0; j < scannerInfosForContentType.length; j++) {
if (!scannerInfos.contains(scannerInfosForContentType[j])) {
scannerInfos.add(scannerInfosForContentType[j]);
}
}
}
IFileTaskScanner[] scanners = new IFileTaskScanner[scannerInfos.size()];
for (int i = 0; i < scanners.length; i++) {
scanners[i] = ((ScannerInfo) scannerInfos.get(i)).getScanner();
}
return scanners;
}
public String[] getSupportedContentTypeIds() {
if (fScannerElements == null) {
readRegistry();
}
// find the relevant extensions
List types = new ArrayList(0);
IConfigurationElement[] scannerElements = fScannerElements;
for (int j = 0; j < scannerElements.length; j++) {
if (!scannerElements[j].getName().equals(NAME_SCANNER))
continue;
String[] contentTypeIds = StringUtils.unpack(scannerElements[j].getAttribute(ATT_CONTENT_TYPES));
for (int i = 0; i < contentTypeIds.length; i++) {
if (!types.contains(contentTypeIds[i])) {
types.add(contentTypeIds[i]);
}
}
}
return (String[]) types.toArray(new String[types.size()]);
}
private ScannerInfo[] loadScanners(IContentType contentType) {
List elements = new ArrayList(0);
ScannerInfo[] scannerInfos = null;
IConfigurationElement[] delegateElements = fScannerElements;
if (contentType != null) {
IContentTypeManager contentTypeManager = Platform.getContentTypeManager();
for (int j = 0; j < delegateElements.length; j++) {
if (!delegateElements[j].getName().equals(NAME_SCANNER))
continue;
String[] supportedContentTypeIds = StringUtils.unpack(delegateElements[j].getAttribute(ATT_CONTENT_TYPES));
IContentType[] supportedContentTypes = new IContentType[supportedContentTypeIds.length];
for (int k = 0; k < supportedContentTypeIds.length; k++) {
supportedContentTypes[k] = contentTypeManager.getContentType(supportedContentTypeIds[k].trim());
}
for (int k = 0; k < supportedContentTypeIds.length; k++) {
// allow subtypes to be returned as well
if (supportedContentTypes[k] != null && contentType.isKindOf(supportedContentTypes[k])) {
elements.add(delegateElements[j]);
}
}
}
// instantiate and save the scanners
List scannerInfoList = new ArrayList(elements.size());
for (int i = 0; i < elements.size(); i++) {
try {
IFileTaskScanner scanner = (IFileTaskScanner) ((IConfigurationElement) elements.get(i)).createExecutableExtension(ATT_CLASS);
if (scanner != null) {
scannerInfoList.add(new ScannerInfo(((IConfigurationElement) elements.get(i)).getAttribute(ATT_ID), scanner));
}
}
catch (CoreException e) {
Logger.logException("Non-fatal exception creating task scanner for " + contentType.getId(), e); //$NON-NLS-1$
}
}
scannerInfos = (ScannerInfo[]) scannerInfoList.toArray(new ScannerInfo[scannerInfoList.size()]);
fScannerInfos.put(contentType.getId(), scannerInfos);
if (Logger.DEBUG_TASKSREGISTRY) {
System.out.println("Created " + scannerInfos.length + " task scanner for " + contentType.getId()); //$NON-NLS-1$ //$NON-NLS-2$
}
}
return scannerInfos;
}
private void readRegistry() {
fScannerInfos = new HashMap();
// Just remember the elements, so plugins don't have to be activated,
// unless extension attributes match those of interest
IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(SCANNER_EXTENSION_POINT_ID);
if (point != null) {
fScannerElements = point.getConfigurationElements();
}
}
}
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