[EGIT PATCH 07/11] Allow WorkingTreeIterator to track last modified time for entries

["Shawn O. Pearce" <spearce@spearce.org>]

We need this last modified time to compare against the index to decide
if a file is dirty or not.  Its computed on demand only for the items
we actually care about, as we don't need the last modified time for a
directory.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../spearce/jgit/treewalk/FileTreeIterator.java    |    9 +++++++++
 .../spearce/jgit/treewalk/WorkingTreeIterator.java |   13 +++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/org.spearce.jgit/src/org/spearce/jgit/treewalk/FileTreeIterator.java b/org.spearce.jgit/src/org/spearce/jgit/treewalk/FileTreeIterator.java
index 331f153..25425dd 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/treewalk/FileTreeIterator.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/treewalk/FileTreeIterator.java
@@ -106,6 +106,8 @@ public class FileTreeIterator extends WorkingTreeIterator {
 
 		private long length = -1;
 
+		private long lastModified;
+
 		FileEntry(final File f) {
 			file = f;
 
@@ -138,6 +140,13 @@ public class FileTreeIterator extends WorkingTreeIterator {
 		}
 
 		@Override
+		public long getLastModified() {
+			if (lastModified == 0)
+				lastModified = file.lastModified();
+			return lastModified;
+		}
+
+		@Override
 		public InputStream openInputStream() throws IOException {
 			return new FileInputStream(file);
 		}
diff --git a/org.spearce.jgit/src/org/spearce/jgit/treewalk/WorkingTreeIterator.java b/org.spearce.jgit/src/org/spearce/jgit/treewalk/WorkingTreeIterator.java
index afac77b..cb4a089 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/treewalk/WorkingTreeIterator.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/treewalk/WorkingTreeIterator.java
@@ -433,6 +433,19 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		public abstract long getLength();
 
 		/**
+		 * Get the last modified time of this entry.
+		 * <p>
+		 * <b>Note: Efficient implementation required.</b>
+		 * <p>
+		 * The implementation of this method must be efficient. If a subclass
+		 * needs to compute the value they should cache the reference within an
+		 * instance member instead.
+		 * 
+		 * @return time since the epoch (in ms) of the last change.
+		 */
+		public abstract long getLastModified();
+
+		/**
 		 * Get the name of this entry within its directory.
 		 * <p>
 		 * Efficient implementations are not required. The caller will obtain
-- 
1.6.0.rc2.219.g1250ab