# HG changeset patch
# User Artem Tikhomirov <tikhomirov.artem@gmail.com>
# Date 1314237459 -7200
# Node ID 9fb50c04f03c297e43df013a8c789e9eefc827dc
# Parent  8f872bd7ddd254b4fa6e1d4ecf0c122f9c48ae61
Use Nodeid.isNull check instead of NULL.equals

diff -r 8f872bd7ddd2 -r 9fb50c04f03c cmdline/org/tmatesoft/hg/console/ChangesetDumpHandler.java
--- a/cmdline/org/tmatesoft/hg/console/ChangesetDumpHandler.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/cmdline/org/tmatesoft/hg/console/ChangesetDumpHandler.java	Thu Aug 25 03:57:39 2011 +0200
@@ -104,8 +104,8 @@
 		if (complete) {
 			Nodeid p1 = cset.getFirstParentRevision();
 			Nodeid p2 = cset.getSecondParentRevision();
-			int p1x = p1 == Nodeid.NULL ? -1 : repo.getChangelog().getLocalRevision(p1);
-			int p2x = p2 == Nodeid.NULL ? -1 : repo.getChangelog().getLocalRevision(p2);
+			int p1x = p1.isNull() ? -1 : repo.getChangelog().getLocalRevision(p1);
+			int p2x = p2.isNull() ? -1 : repo.getChangelog().getLocalRevision(p2);
 			int mx = repo.getManifest().getLocalRevision(cset.getManifestRevision());
 			f.format("parent:      %d:%s\nparent:      %d:%s\nmanifest:    %d:%s\n", p1x, p1, p2x, p2, mx, cset.getManifestRevision());
 		}
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/core/HgChangeset.java
--- a/src/org/tmatesoft/hg/core/HgChangeset.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/core/HgChangeset.java	Thu Aug 25 03:57:39 2011 +0200
@@ -16,8 +16,6 @@
  */
 package org.tmatesoft.hg.core;
 
-import static org.tmatesoft.hg.core.Nodeid.NULL;
-
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -140,9 +138,12 @@
 
 	public boolean isMerge() {
 		// p1 == -1 and p2 != -1 is legitimate case
-		return !NULL.equals(getFirstParentRevision()) && !NULL.equals(getSecondParentRevision()); 
+		return !(getFirstParentRevision().isNull() || getSecondParentRevision().isNull()); 
 	}
 	
+	/**
+	 * @return never <code>null</code>
+	 */
 	public Nodeid getFirstParentRevision() {
 		if (parentHelper != null) {
 			return parentHelper.safeFirstParent(nodeid);
@@ -156,6 +157,9 @@
 		return Nodeid.fromBinary(parent1, 0);
 	}
 	
+	/**
+	 * @return never <code>null</code>
+	 */
 	public Nodeid getSecondParentRevision() {
 		if (parentHelper != null) {
 			return parentHelper.safeSecondParent(nodeid);
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/core/HgCloneCommand.java
--- a/src/org/tmatesoft/hg/core/HgCloneCommand.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/core/HgCloneCommand.java	Thu Aug 25 03:57:39 2011 +0200
@@ -232,7 +232,7 @@
 		}
 
 		private int knownRevision(Nodeid p) {
-			if (NULL.equals(p)) {
+			if (p.isNull()) {
 				return -1;
 			} else {
 				for (int i = revisionSequence.size() - 1; i >= 0; i--) {
@@ -250,7 +250,7 @@
 				boolean writeComplete = false;
 				Nodeid p1 = ge.firstParent();
 				Nodeid p2 = ge.secondParent();
-				if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
+				if (p1.isNull() && p2.isNull() /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
 					prevRevContent = new ByteArrayDataAccess(new byte[0]);
 					writeComplete = true;
 				}
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/core/HgFileInformer.java
--- a/src/org/tmatesoft/hg/core/HgFileInformer.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/core/HgFileInformer.java	Thu Aug 25 03:57:39 2011 +0200
@@ -58,7 +58,7 @@
 	 * @return <code>this</code> for convenience
 	 */
 	public HgFileInformer changeset(Nodeid nid) {
-		if (nid == null || Nodeid.NULL.equals(nid)) {
+		if (nid == null || nid.isNull()) {
 			throw new IllegalArgumentException(); 
 		}
 		cset = nid;
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/internal/RepositoryComparator.java
--- a/src/org/tmatesoft/hg/internal/RepositoryComparator.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/internal/RepositoryComparator.java	Thu Aug 25 03:57:39 2011 +0200
@@ -155,10 +155,10 @@
 					checkUp2Head.add(rb);
 				} else {
 					// dig deeper in the history, if necessary
-					if (!NULL.equals(rb.p1) && !localRepo.knownNode(rb.p1)) {
+					if (!rb.p1.isNull() && !localRepo.knownNode(rb.p1)) {
 						toQuery.add(rb.p1);
 					}
-					if (!NULL.equals(rb.p2) && !localRepo.knownNode(rb.p2)) {
+					if (!rb.p2.isNull() && !localRepo.knownNode(rb.p2)) {
 						toQuery.add(rb.p2);
 					}
 				}
@@ -245,7 +245,7 @@
 				} else {
 					chainElement.branchRoot = rb.root;
 					// dig deeper in the history, if necessary
-					boolean hasP1 = !NULL.equals(rb.p1), hasP2 = !NULL.equals(rb.p2);  
+					boolean hasP1 = !rb.p1.isNull(), hasP2 = !rb.p2.isNull();  
 					if (hasP1 && !localRepo.knownNode(rb.p1)) {
 						toQuery.add(rb.p1);
 						// we might have seen parent node already, and recorded it as a branch chain
@@ -356,7 +356,7 @@
 		// true when this BranchChain is a branch that spans up to very start of the repository
 		// Thus, the only common revision is NULL, recorded in a fake BranchChain object shared between p1 and p2
 		/*package-local*/ boolean isRepoStart() {
-			return p1 == p2 && p1 != null && p1.branchHead == p1.branchRoot && NULL.equals(p1.branchHead);
+			return p1 == p2 && p1 != null && p1.branchHead == p1.branchRoot && p1.branchHead.isNull();
 		}
 
 		@Override
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/repo/HgBundle.java
--- a/src/org/tmatesoft/hg/repo/HgBundle.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/repo/HgBundle.java	Thu Aug 25 03:57:39 2011 +0200
@@ -16,8 +16,6 @@
  */
 package org.tmatesoft.hg.repo;
 
-import static org.tmatesoft.hg.core.Nodeid.NULL;
-
 import java.io.File;
 import java.io.IOException;
 import java.util.LinkedList;
@@ -141,7 +139,7 @@
 				HgChangelog changelog = hgRepo.getChangelog();
 				try {
 					if (prevRevContent == null) { 
-						if (NULL.equals(ge.firstParent()) && NULL.equals(ge.secondParent())) {
+						if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
 							prevRevContent = new ByteArrayDataAccess(new byte[0]);
 						} else {
 							final Nodeid base = ge.firstParent();
@@ -389,18 +387,22 @@
 			dataAccess = rawDataAccess;
 		}
 
+		// non-null
 		public Nodeid node() {
 			return Nodeid.fromBinary(header, 0);
 		}
 
+		// non-null
 		public Nodeid firstParent() {
 			return Nodeid.fromBinary(header, 20);
 		}
 
+		// non-null
 		public Nodeid secondParent() {
 			return Nodeid.fromBinary(header, 40);
 		}
 
+		// non-null
 		public Nodeid cset() { // cs seems to be changeset
 			return Nodeid.fromBinary(header, 60);
 		}
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/repo/HgRemoteRepository.java
--- a/src/org/tmatesoft/hg/repo/HgRemoteRepository.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/repo/HgRemoteRepository.java	Thu Aug 25 03:57:39 2011 +0200
@@ -442,6 +442,7 @@
 				return false;
 			}
 			RemoteBranch o = (RemoteBranch) obj;
+			// in fact, p1 and p2 are not supposed to be null, ever (at least for RemoteBranch created from server output)
 			return head.equals(o.head) && root.equals(o.root) && (p1 == null && o.p1 == null || p1.equals(o.p1)) && (p2 == null && o.p2 == null || p2.equals(o.p2));
 		}
 	}
diff -r 8f872bd7ddd2 -r 9fb50c04f03c src/org/tmatesoft/hg/repo/Revlog.java
--- a/src/org/tmatesoft/hg/repo/Revlog.java	Thu Aug 25 03:56:27 2011 +0200
+++ b/src/org/tmatesoft/hg/repo/Revlog.java	Thu Aug 25 03:57:39 2011 +0200
@@ -16,7 +16,6 @@
  */
 package org.tmatesoft.hg.repo;
 
-import static org.tmatesoft.hg.core.Nodeid.NULL;
 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
 import static org.tmatesoft.hg.repo.HgRepository.TIP;
 
@@ -439,7 +438,7 @@
 			return sequential[localRevision];
 		}
 		public int localRevision(Nodeid revision) {
-			if (revision == null || NULL.equals(revision)) {
+			if (revision == null || revision.isNull()) {
 				return BAD_REVISION;
 			}
 			int x = Arrays.binarySearch(sorted, revision);