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/*******************************************************************************
* Copyright (c) 2011, 2014 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.runtime.persistence.services;
import java.io.IOException;
import java.net.URI;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.Platform;
import org.eclipse.tcf.te.runtime.persistence.PersistenceManager;
import org.eclipse.tcf.te.runtime.persistence.interfaces.IPersistableURIProvider;
import org.eclipse.tcf.te.runtime.persistence.interfaces.IPersistenceDelegate;
import org.eclipse.tcf.te.runtime.persistence.interfaces.IURIPersistenceService;
import org.eclipse.tcf.te.runtime.services.AbstractService;
/**
* Persistence service implementation.
*/
public class URIPersistenceService extends AbstractService implements IURIPersistenceService {
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.persistence.interfaces.IURIPersistenceService#write(java.lang.Object, java.net.URI)
*/
@Override
public void write(Object context, URI uri) throws IOException {
Assert.isNotNull(context);
uri = uri != null ? uri : getURI(context);
// Determine the persistence delegate
IPersistenceDelegate delegate = PersistenceManager.getInstance().getDelegate(context, uri);
// If the persistence delegate could not be determined, throw an IOException
if (delegate == null) {
throw new IOException("The persistence delegate for context '" + context.getClass().getName() + "' cannot be determined."); //$NON-NLS-1$ //$NON-NLS-2$
}
// Pass on to the delegate for writing
delegate.write(context, uri);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.persistence.interfaces.IURIPersistenceService#read(java.lang.Object, java.net.URI)
*/
@Override
public Object read(Object context, URI uri) throws IOException {
Assert.isNotNull(context);
uri = uri != null ? uri : getURI(context);
// Determine the persistence delegate
IPersistenceDelegate delegate = PersistenceManager.getInstance().getDelegate(context, uri);
// If the persistence delegate could not be determined, throw an IOException
if (delegate == null) {
throw new IOException("The persistence delegate for context '" + context.getClass().getName() + "' cannot be determined."); //$NON-NLS-1$ //$NON-NLS-2$
}
// Pass on to the delegate for reading
return delegate.read(context, uri);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.persistence.interfaces.IURIPersistenceService#delete(java.lang.Object, java.net.URI)
*/
@Override
public boolean delete(Object context, URI uri) throws IOException {
Assert.isNotNull(context);
uri = uri != null ? uri : getURI(context);
// Determine the persistence delegate
IPersistenceDelegate delegate = PersistenceManager.getInstance().getDelegate(context, uri);
// If the persistence delegate could not be determined, throw an IOException
if (delegate == null) {
throw new IOException("The persistence delegate for context '" + context.getClass().getName() + "' cannot be determined."); //$NON-NLS-1$ //$NON-NLS-2$
}
return delegate.delete(context, uri);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.persistence.interfaces.IURIPersistenceService#getURI(java.lang.Object)
*/
@Override
public URI getURI(Object context) throws IOException {
Assert.isNotNull(context);
// Determine the persistable element for the given data object
IPersistableURIProvider persistableURIProvider = context instanceof IPersistableURIProvider ? (IPersistableURIProvider)context : null;
// If the element isn't a persistable by itself, try to adapt the element
if (persistableURIProvider == null) {
persistableURIProvider = context instanceof IAdaptable ? (IPersistableURIProvider) ((IAdaptable)context).getAdapter(IPersistableURIProvider.class) : null;
}
if (persistableURIProvider == null) {
persistableURIProvider = (IPersistableURIProvider) Platform.getAdapterManager().getAdapter(context, IPersistableURIProvider.class);
}
// If the persistable could be still not determined, throw an IOException
if (persistableURIProvider == null) {
throw new IOException("'context' must be adaptable to IPersistableURIProvider."); //$NON-NLS-1$
}
URI uri = persistableURIProvider.getURI(context);
if (uri == null) {
throw new IOException("The URI cannot be determined for context '" + context.getClass().getName() + "'."); //$NON-NLS-1$ //$NON-NLS-2$
}
// Determine the URI
return uri;
}
}
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