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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.reconciler;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.text.IRegion;
/**
* A reconcile step is one of several steps of a
* {@linkplain org.eclipse.jface.text.reconciler.IReconcilingStrategy reconcile strategy}
* that consists of several steps. This relationship is not coded into an interface but
* should be used by clients who's reconcile strategy consists of several steps.
* <p>
* If a reconcile step has an {@linkplain org.eclipse.jface.text.reconciler.IReconcilableModel input model}
* it will compute the correct model for the next step in the chain and set the next steps
* input model before <code>reconcile</code> gets called on that next step. After the last
* step has reconciled the {@linkplain org.eclipse.jface.text.reconciler.IReconcileResult reconcile result}
* array gets returned to the previous step. Each step in the chain adapts the result to its
* input model and returns it to its previous step.
* </p>
* <p>
* Example: Assume a strategy consists of steps A, B and C. And the main model is M.
* The strategy will set M to be A's input model. What will happen is:
* <ol>
* <li>A.setInputModel(M)</li>
* <li>A.reconcile: A reconciles M</li>
* <li>A computes the model for B => MB</li>
* <li>B.setInputModel(MB)</li>
* <li>B.reconcile: B reconciles MB</li>
* <li>B computes the model for C => MC</li>
* <li>C.setInputModel(MC)</li>
* <li>C.reconcile: C reconciles MC</li>
* <li>C returns result RC to step B</li>
* <li>B adapts the RC to MB and merges with its own results</li>
* <li>B returns result RB to step A</li>
* <li>A adapts the result to M and merges with its own results</li>
* <li>A returns the result to the reconcile strategy</li>
* </ol>
* </p>
* <p>
* This interface must be implemented by clients.
* </p>
* @since 3.0
*/
public interface IReconcileStep {
/**
* Returns whether this is the last reconcile step or not.
*
* @return <code>true</code> iff this is the last reconcile step
*/
boolean isLastStep();
/**
* Returns whether this is the first reconcile step or not.
*
* @return <code>true</code> iff this is the first reconcile step
*/
boolean isFirstStep();
/**
* Sets the step which is in front of this step in the pipe.
* <p>
* Note: This method must be called at most once per reconcile step.
* </p>
*
* @param step the previous step
* @throws RuntimeException if called more than once
*/
void setPreviousStep(IReconcileStep step);
/**
* Activates incremental reconciling of the specified dirty region.
* As a dirty region might span multiple content types, the segment of the
* dirty region which should be investigated is also provided to this
* reconciling strategy. The given regions refer to the document passed into
* the most recent call of {@link IReconcilingStrategy#setDocument(org.eclipse.jface.text.IDocument)}.
*
* @param dirtyRegion the document region which has been changed
* @param subRegion the sub region in the dirty region which should be reconciled
* @return an array with reconcile results
*/
IReconcileResult[] reconcile(DirtyRegion dirtyRegion, IRegion subRegion);
/**
* Activates non-incremental reconciling. The reconciling strategy is just told
* that there are changes and that it should reconcile the given partition of the
* document most recently passed into {@link IReconcilingStrategy#setDocument(org.eclipse.jface.text.IDocument)}.
*
* @param partition the document partition to be reconciled
* @return an array with reconcile results
*/
IReconcileResult[] reconcile(IRegion partition);
/**
* Sets the progress monitor for this reconcile step.
*
* @param monitor the progress monitor to be used
*/
void setProgressMonitor(IProgressMonitor monitor);
/**
* Returns the progress monitor used to report progress.
*
* @return a progress monitor or <code>null</code> if no progress monitor is available
*/
public IProgressMonitor getProgressMonitor();
/**
* Tells this reconcile step on which model it will
* work. This method will be called before any other method
* and can be called multiple times. The regions passed to the
* other methods always refer to the most recent model
* passed into this method.
*
* @param inputModel the model on which this step will work
*/
void setInputModel(IReconcilableModel inputModel);
}
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