[gnome-subtitles] Operator that allows to merge subtitles.

[Pedro Daniel da Rocha Melo e Castro <pcastro src gnome org>]

commit 3656b4d555331e7da67e04968c935376ec168aa8
Author: Pedro Castro <mail pedrocastro org>
Date:   Sat Jun 11 19:41:42 2011 +0100

    Operator that allows to merge subtitles.

 src/SubLib/Core/Timing/MergeOperator.cs |   78 +++++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)
---
diff --git a/src/SubLib/Core/Timing/MergeOperator.cs b/src/SubLib/Core/Timing/MergeOperator.cs
new file mode 100644
index 0000000..ff0b4d8
--- /dev/null
+++ b/src/SubLib/Core/Timing/MergeOperator.cs
@@ -0,0 +1,78 @@
+/*
+ * This file is part of SubLib.
+ * Copyright (C) 2011 Pedro Castro
+ *
+ * SubLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * SubLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+using SubLib.Core.Domain;
+using System;
+
+namespace SubLib.Core.Timing {
+
+/// <summary>Performs merge operations.</summary>
+public class MergeOperator {
+	private Subtitles subtitles = null;
+	
+	public MergeOperator (Subtitles subtitles) {
+		this.subtitles = subtitles;
+	}
+
+	/* Public members */
+	
+	public bool Merge (int firstSubtitleNumber, int lastSubtitleNumber) {
+		if (!isOperationValid(firstSubtitleNumber, lastSubtitleNumber))
+			return false;
+		else {
+			Merge(this.subtitles, firstSubtitleNumber, lastSubtitleNumber);
+			return true;
+		}
+	}
+	
+	
+	/* Private members */
+	
+	/// <summary>Splits a subtitle in two halves. The subtitle passed as parameter is turned into the first half and the second half is returned.</summary>
+	/// <param name="subtitles">The subtitle to split</param>
+	/// <param name="subtitleProperties">The subtitle properties</param>
+	/// <param name="timeBetweenSubtitles">Time between the 2 subtitles, in milliseconds</param>
+	private void Merge (Subtitles subtitles, int firstSubtitleNumber, int lastSubtitleNumber) {
+		Subtitle firstSubtitle = subtitles.Collection[firstSubtitleNumber];
+		
+		/* Add lines */
+		for (int currentSubtitleNumber = firstSubtitleNumber + 1 ; currentSubtitleNumber <= lastSubtitleNumber ; currentSubtitleNumber++) {
+			Subtitle currentSubtitle = subtitles.Collection[currentSubtitleNumber];
+			firstSubtitle.Text.Add(currentSubtitle.Text.GetLines());
+			if (currentSubtitle.HasTranslation) {
+				firstSubtitle.Translation.Add(currentSubtitle.Translation.GetLines());
+			}
+		}
+		
+		/* Set times */
+		Subtitle lastSubtitle = subtitles.Collection[lastSubtitleNumber];
+		firstSubtitle.Times.End = lastSubtitle.Times.End;
+	}
+	
+	bool isOperationValid (int firstSubtitleNumber, int lastSubtitleNumber) {
+		if (firstSubtitleNumber > lastSubtitleNumber)
+			return false;
+			
+		Subtitle firstSubtitle = subtitles.Collection[firstSubtitleNumber];
+		Subtitle lastSubtitle = subtitles.Collection[lastSubtitleNumber];
+		return (firstSubtitle != null) && (lastSubtitle != null) && (firstSubtitle.Times.Start <= lastSubtitle.Times.End);
+	}
+}
+
+}