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/*****************************************************************************
* Copyright (c) 2015, 2016 Christian W. Damus 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.commands.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CompoundCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.ICompositeCommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.CommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.papyrus.commands.wrappers.EMFtoGEFCommandWrapper;
import org.eclipse.papyrus.commands.wrappers.GEFtoEMFCommandWrapper;
import org.eclipse.papyrus.commands.wrappers.GMFtoGEFCommandWrapper;
import org.eclipse.papyrus.commands.wrappers.OperationToGEFCommandWrapper;
import org.eclipse.papyrus.infra.emf.gmf.command.EMFtoGMFCommandWrapper;
import org.eclipse.papyrus.infra.emf.gmf.command.GMFtoEMFCommandWrapper;
/**
* An iterator over the tree structure of EMF, GEF, and GMF commands that returns leaf commands of one or all of these kinds,
* with accounting for the various kinds of wrappers employed to intermix them. This iterator does not support the
* optional {@link Iterator#remove()} operation.
*
* @deprecated Use the {@link org.eclipse.papyrus.infra.emf.gmf.util.CommandTreeIterator} API, instead.
*/
@Deprecated
public class CommandTreeIterator<C> implements Iterator<C> {
private final Class<C> type;
private Iterator<?> current;
private List<Iterator<?>> iterators = new ArrayList<Iterator<?>>();
private C preparedNext;
private CommandTreeIterator(Object root, Class<C> type) {
super();
this.type = type;
root = unwrap(root);
if (isCompound(root)) {
pushIterator(root);
} else {
prepareNext(root);
}
}
public static CommandTreeIterator<Command> iterateEMF(Object command) {
return iterate(command, Command.class);
}
public static CommandTreeIterator<org.eclipse.gef.commands.Command> iterateGEF(Object command) {
return iterate(command, org.eclipse.gef.commands.Command.class);
}
public static CommandTreeIterator<ICommand> iterateGMF(Object command) {
return iterate(command, ICommand.class);
}
public static CommandTreeIterator<?> iterate(Object command) {
return iterate(command, Object.class);
}
public static <C> CommandTreeIterator<C> iterate(Object command, Class<C> leafCommandType) {
return new CommandTreeIterator<C>(command, leafCommandType);
}
private boolean prepareNext(Object command) {
if (type.isInstance(command)) {
preparedNext = type.cast(command);
}
return preparedNext != null;
}
private Iterator<?> pushIterator(Object compoundCommand) {
if (current != null) {
iterators.add(current);
}
current = iterator(compoundCommand);
return current;
}
private Iterator<?> popIterator() {
if (iterators.isEmpty()) {
current = null;
} else {
current = iterators.remove(iterators.size() - 1);
}
return current;
}
private Object internalNext() {
Object result = null;
while ((result == null) && (current != null)) {
if (current.hasNext()) {
Object next = unwrap(current.next());
if (isCompound(next)) {
// Dive into it
pushIterator(next);
} else {
// We have the next leaf
result = next;
}
} else {
popIterator();
}
}
return result;
}
boolean isDone() {
return (current == null) && iterators.isEmpty();
}
@Override
public boolean hasNext() {
while (!isDone() && (preparedNext == null)) {
Object next = internalNext();
if (type.isInstance(next)) {
preparedNext = type.cast(next);
}
}
return preparedNext != null;
}
@Override
public C next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
C result = preparedNext;
preparedNext = null;
return result;
}
/**
* Remove is not supported.
*/
@Override
public void remove() {
throw new UnsupportedOperationException("remove"); //$NON-NLS-1$
}
private Object unwrap(Object command) {
Object result = command;
if (command instanceof ICommandProxy) {
result = ((ICommandProxy) command).getICommand();
} else if (command instanceof CommandProxy) {
result = ((CommandProxy) command).getCommand();
} else if (result instanceof EMFtoGEFCommandWrapper) {
result = ((EMFtoGEFCommandWrapper) result).getEMFCommand();
} else if (result instanceof EMFtoGMFCommandWrapper) {
result = ((EMFtoGMFCommandWrapper) command).getEMFCommand();
} else if (result instanceof GEFtoEMFCommandWrapper) {
result = ((GEFtoEMFCommandWrapper) command).getGEFCommand();
} else if (result instanceof GMFtoEMFCommandWrapper) {
result = ((GMFtoEMFCommandWrapper) command).getGMFCommand();
} else if (result instanceof GMFtoGEFCommandWrapper) {
result = ((GMFtoGEFCommandWrapper) command).getGMFCommand();
} else if (result instanceof OperationToGEFCommandWrapper) {
result = ((OperationToGEFCommandWrapper) command).getOperation();
}
if (result != command) {
// Could be turtles all the way down
result = unwrap(result);
}
return result;
}
private boolean isCompound(Object command) {
return ((command instanceof CompoundCommand) || (command instanceof org.eclipse.gef.commands.CompoundCommand) || (command instanceof ICompositeCommand));
}
private Iterator<?> iterator(Object compoundCommand) {
if (compoundCommand instanceof CompoundCommand) {
return ((CompoundCommand) compoundCommand).getCommandList().iterator();
} else if (compoundCommand instanceof org.eclipse.gef.commands.CompoundCommand) {
return ((org.eclipse.gef.commands.CompoundCommand) compoundCommand).getCommands().iterator();
} else if (compoundCommand instanceof ICompositeCommand) {
return ((ICompositeCommand) compoundCommand).iterator();
} else {
return Collections.emptyList().iterator();
}
}
}
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