--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/reconciler/AbstractReconcileStep.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,190 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.reconciler.AbstractReconcileStep;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+
+import dwtx.core.runtime.Assert;
+import dwtx.core.runtime.IProgressMonitor;
+import dwtx.jface.text.IRegion;
+
+
+/**
+ * Abstract implementation of a reconcile step.
+ *
+ * @since 3.0
+ */
+public abstract class AbstractReconcileStep : IReconcileStep {
+
+    private IReconcileStep fNextStep;
+    private IReconcileStep fPreviousStep;
+    private IProgressMonitor fProgressMonitor;
+    protected IReconcilableModel fInputModel;
+
+    /**
+     * Creates an intermediate reconcile step which adds
+     * the given step to the pipe.
+     *
+     * @param step the reconcile step
+     */
+    public AbstractReconcileStep(IReconcileStep step) {
+        Assert.isNotNull(step);
+        fNextStep= step;
+        fNextStep.setPreviousStep(this);
+    }
+
+    /**
+     * Creates the last reconcile step of the pipe.
+     */
+    public AbstractReconcileStep() {
+    }
+
+    public bool isLastStep() {
+        return fNextStep is null;
+    }
+
+    public bool isFirstStep() {
+        return fPreviousStep is null;
+    }
+
+    /*
+     * @see dwtx.text.reconcilerpipe.IReconcilerResultCollector#setProgressMonitor(dwtx.core.runtime.IProgressMonitor)
+     */
+    public void setProgressMonitor(IProgressMonitor monitor) {
+        fProgressMonitor= monitor;
+
+        if (!isLastStep())
+            fNextStep.setProgressMonitor(monitor);
+    }
+
+    /*
+     * @see dwtx.jface.text.reconciler.IReconcileStep#getProgressMonitor()
+     */
+    public IProgressMonitor getProgressMonitor() {
+        return fProgressMonitor;
+    }
+
+    /*
+     * @see IReconcileStep#reconcile(IRegion)
+     */
+    public final IReconcileResult[] reconcile(IRegion partition) {
+        IReconcileResult[] result= reconcileModel(null, partition);
+        if (!isLastStep()) {
+            fNextStep.setInputModel(getModel());
+            IReconcileResult[] nextResult= fNextStep.reconcile(partition);
+            return merge(result, convertToInputModel(nextResult));
+        }
+        return result;
+    }
+
+    /*
+     * @see IReconcileStep#reconcile(dwtx.jface.text.reconciler.DirtyRegion, dwtx.jface.text.IRegion)
+     */
+    public final IReconcileResult[] reconcile(DirtyRegion dirtyRegion, IRegion subRegion) {
+        IReconcileResult[] result= reconcileModel(dirtyRegion, subRegion);
+        if (!isLastStep()) {
+            fNextStep.setInputModel(getModel());
+            IReconcileResult[] nextResult= fNextStep.reconcile(dirtyRegion, subRegion);
+            return merge(result, convertToInputModel(nextResult));
+        }
+        return result;
+    }
+
+
+    /**
+     * Reconciles the model of this reconcile step. The
+     * result is based on the input model.
+     *
+     * @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
+     */
+    abstract protected IReconcileResult[] reconcileModel(DirtyRegion dirtyRegion, IRegion subRegion);
+
+    /**
+     * Adapts the given an array with reconcile results to
+     * this step's input model and returns it.
+     *
+     * @param inputResults an array with reconcile results
+     * @return an array with the reconcile results adapted to the input model
+     */
+    protected IReconcileResult[] convertToInputModel(IReconcileResult[] inputResults) {
+        return inputResults;
+    }
+
+    /**
+     * Merges the two reconcile result arrays.
+     *
+     * @param results1 an array with reconcile results
+     * @param results2 an array with reconcile results
+     * @return an array with the merged reconcile results
+     */
+    private IReconcileResult[] merge(IReconcileResult[] results1, IReconcileResult[] results2) {
+        if (results1 is null)
+            return results2;
+
+        if (results2 is null)
+            return results1;
+
+        // XXX: not yet performance optimized
+        Collection collection= new ArrayList(Arrays.asList(results1));
+        collection.addAll(Arrays.asList(results2));
+        return (IReconcileResult[])collection.toArray(new IReconcileResult[collection.size()]);
+    }
+
+    /*
+     * @see IProgressMonitor#isCanceled()
+     */
+    protected final bool isCanceled() {
+        return fProgressMonitor !is null && fProgressMonitor.isCanceled();
+    }
+
+    /*
+     * @see IReconcileStep#setPreviousStep(IReconcileStep)
+     */
+    public void setPreviousStep(IReconcileStep step) {
+        Assert.isNotNull(step);
+        Assert.isTrue(fPreviousStep is null);
+        fPreviousStep= step;
+    }
+
+    /*
+     * @see IReconcileStep#setInputModel(Object)
+     */
+    public void setInputModel(IReconcilableModel inputModel) {
+        fInputModel= inputModel;
+
+        if (!isLastStep())
+            fNextStep.setInputModel(getModel());
+    }
+
+    /**
+     * Returns the reconcilable input model.
+     *
+     * @return the reconcilable input model.
+     */
+    public IReconcilableModel getInputModel() {
+        return fInputModel;
+    }
+
+    /**
+     * Returns the reconcilable model.
+     *
+     * @return the reconcilable model
+     */
+    abstract public IReconcilableModel getModel();
+}