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/*******************************************************************************
* Copyright (c) 2008, 2014 THALES GLOBAL SERVICES and others.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.tools.api.command;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Stack;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.sirius.business.api.logger.RuntimeLoggerInterpreter;
import org.eclipse.sirius.business.api.logger.RuntimeLoggerManager;
import org.eclipse.sirius.common.tools.api.interpreter.IInterpreter;
import org.eclipse.sirius.tools.api.interpreter.InterpreterUtil;
import org.eclipse.sirius.viewpoint.DRepresentation;
import org.eclipse.sirius.viewpoint.description.tool.For;
import org.eclipse.sirius.viewpoint.description.tool.ToolPackage;
/**
* This class keeps the trace of all contexts.
*
* @author cbrun
*/
public class CommandContext {
/** The stack of all context. */
private Stack<EObject> targetStack = new Stack<EObject>();
/** The initial push. */
private EObject nextPushEObject;
private DRepresentation representation;
/**
* Create a new {@link CommandContext}.
*
* @param target
* the first context.
* @param representation
* the current representation
* @since 0.9.0
*/
public CommandContext(final EObject target, final DRepresentation representation) {
this.nextPushEObject = target;
this.representation = representation;
}
/**
* Get the current representation.
*
* @return the representation currently edited
* @since 0.9.0
*/
public DRepresentation getRepresentation() {
return this.representation;
}
/**
* Return the current context.
*
* @return the current context.
*/
public EObject getCurrentTarget() {
if (this.targetStack.isEmpty()) {
return nextPushEObject;
}
return this.targetStack.peek();
}
/**
* Return the next element to push.
*
* @return the next element to push.
*/
public EObject getNextPush() {
return this.nextPushEObject != null ? this.nextPushEObject : this.getCurrentTarget();
}
/**
* Clear the next push.
*/
public void clearNextPush() {
this.nextPushEObject = null;
}
/**
* Define the next push.
*
* @param nextPushEObject
* the next push.
*/
public void setNextPushEObject(final EObject nextPushEObject) {
this.nextPushEObject = nextPushEObject;
}
/**
* Push the specified object.
*
* @param newTarget
* the object to push.
*/
public void pushTarget(final EObject newTarget) {
targetStack.push(newTarget);
}
/**
* Pop and return the popped context. Return <code>null</code> if the is no
* available context.
*
* @return the popped context.
*/
public EObject popTarget() {
EObject result = null;
if (!targetStack.isEmpty()) {
result = targetStack.pop();
}
return result;
}
/**
* Push the context of the specified command context.
*
* @param context
* the command context.
*/
public static void pushContext(final CommandContext context) {
context.pushTarget(context.getNextPush());
context.clearNextPush();
}
/**
* Pop the context of the specified command context.
*
* @param context
* the command context.
*/
public static void popContext(final CommandContext context) {
context.popTarget();
}
/**
* Load the list of contexts.
*
* @param forOp
* the expression that gets the list of contexts.
* @param context
* the current context.
* @return the list of contexts.
*/
public static List<Object> getContextTargets(final For forOp, final CommandContext context) {
List<Object> contextTargets = null;
final IInterpreter inter = InterpreterUtil.getInterpreter(context.getCurrentTarget());
final RuntimeLoggerInterpreter safeInterpreter = RuntimeLoggerManager.INSTANCE.decorate(inter);
final Object result = safeInterpreter.evaluate(context.getCurrentTarget(), forOp, ToolPackage.eINSTANCE.getFor_Expression());
if (result == null) {
contextTargets = new ArrayList<>();
} else if (result instanceof Collection) {
contextTargets = new ArrayList<Object>((Collection<?>) result);
} else if (result.getClass().isArray()) {
contextTargets = new ArrayList<Object>(Arrays.asList((Object[]) result));
} else {
contextTargets = new ArrayList<Object>(Arrays.asList(result));
}
return contextTargets;
}
}
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