/*=============================================================================#
# Copyright (c) 2015-2016 Stephan Wahlbrink (WalWare.de) 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:
# Stephan Wahlbrink - initial API and implementation
#=============================================================================*/
package de.walware.docmlet.base.internal.ui.processing;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.osgi.util.NLS;
import de.walware.ecommons.IDisposable;
import de.walware.docmlet.base.internal.ui.DocBaseUIPlugin;
import de.walware.docmlet.base.ui.DocBaseUI;
import de.walware.docmlet.base.ui.processing.DocProcessingManager;
public class DocProcessingRegistry implements IDisposable {
private static final String EXTENSION_POINT_ID= "de.walware.docmlet.base.docProcessing"; //$NON-NLS-1$
private static final String PROCESSING_TYPE_ELEMENT_NAME= "processingType"; //$NON-NLS-1$
private static final String CONTENT_TYPE_ID_ATTR_NAME= "contentTypeId"; //$NON-NLS-1$
private static final String CONFIG_TYPE_ID_ATTR_NAME= "configTypeId"; //$NON-NLS-1$
private static final String MANAGER_CLASS_ATTR_NAME= "managerClass"; //$NON-NLS-1$
public static abstract class TypeElement {
protected abstract void init(String contentTypeId, String configTypeId);
}
private static class TypeEntry {
private static final byte S_MANAGER_FAILED= 0b0_00000001;
private static final byte S_DISPOSED= (byte) 0b0_10000000;
private final String contentTypeId;
private final IConfigurationElement element;
private byte state;
private DocProcessingManager manager;
public TypeEntry(final String contentTypeId, final IConfigurationElement element) {
this.contentTypeId= contentTypeId.intern();
this.element= element;
}
public String getContentTypeId() {
return this.contentTypeId;
}
public DocProcessingManager getManager() {
DocProcessingManager manager= this.manager;
if (manager == null) {
synchronized (this) {
manager= this.manager;
if (manager == null && (this.state & (S_MANAGER_FAILED | S_DISPOSED)) == 0) {
try {
final String configTypeId= this.element.getAttribute(CONFIG_TYPE_ID_ATTR_NAME);
manager= (DocProcessingManager)
this.element.createExecutableExtension(MANAGER_CLASS_ATTR_NAME);
((TypeElement) manager).init(getContentTypeId(), configTypeId);
this.manager= manager;
}
catch (final CoreException e) {
this.state|= S_MANAGER_FAILED;
DocBaseUIPlugin.log(new Status(IStatus.ERROR, DocBaseUI.PLUGIN_ID, 0,
NLS.bind("An error occurred when loading document processing type ''{0}''.", getContentTypeId()),
e ));
return null;
}
}
}
}
return manager;
}
public void dispose() {
synchronized (this) {
this.state|= S_DISPOSED;
final DocProcessingManager manager= this.manager;
if (manager != null) {
manager.dispose();
this.manager= null;
}
}
}
}
private Map<String, TypeEntry> entries;
public DocProcessingRegistry() {
loadContributions();
}
private void loadContributions() {
final Map<String, TypeEntry> entries= new HashMap<>();
final IConfigurationElement[] elements= Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID);
for (final IConfigurationElement element : elements) {
if (element.getName().equals(PROCESSING_TYPE_ELEMENT_NAME)) {
final String contentTypeId= element.getAttribute(CONTENT_TYPE_ID_ATTR_NAME);
if (contentTypeId != null && !contentTypeId.isEmpty()) {
final TypeEntry item= new TypeEntry(contentTypeId, element);
entries.put(item.getContentTypeId(), item);
}
}
}
this.entries= entries;
}
public DocProcessingManager getDocProcessingManager(final String contentTypeId) {
final TypeEntry item= this.entries.get(contentTypeId);
return (item != null) ? item.getManager() : null;
}
@Override
public void dispose() {
for (final TypeEntry entry : this.entries.values()) {
entry.dispose();
}
}
}