reftable: resolve symbolic references
resolve(Ref) helps callers recursively chase symbolic references and is a useful function when wrapping a Reftable inside a RefDatabase, as RefCursor does not resolve symbolic references during iteration. Change-Id: I1ba143f403773497972e225dc92c35ecb989e154
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@ -52,6 +52,7 @@
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertSame;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.fail;
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@ -239,6 +240,42 @@ public void oneSymbolicRef() throws IOException {
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}
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}
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@Test
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public void resolveSymbolicRef() throws IOException {
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Reftable t = read(write(
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sym(HEAD, "refs/heads/tmp"),
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sym("refs/heads/tmp", MASTER),
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ref(MASTER, 1)));
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Ref head = t.exactRef(HEAD);
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assertNull(head.getObjectId());
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assertEquals("refs/heads/tmp", head.getTarget().getName());
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head = t.resolve(head);
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assertNotNull(head);
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assertEquals(id(1), head.getObjectId());
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Ref master = t.exactRef(MASTER);
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assertNotNull(master);
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assertSame(master, t.resolve(master));
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}
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@Test
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public void failDeepChainOfSymbolicRef() throws IOException {
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Reftable t = read(write(
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sym(HEAD, "refs/heads/1"),
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sym("refs/heads/1", "refs/heads/2"),
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sym("refs/heads/2", "refs/heads/3"),
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sym("refs/heads/3", "refs/heads/4"),
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sym("refs/heads/4", "refs/heads/5"),
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sym("refs/heads/5", MASTER),
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ref(MASTER, 1)));
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Ref head = t.exactRef(HEAD);
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assertNull(head.getObjectId());
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assertNull(t.resolve(head));
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}
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@Test
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public void oneDeletedRef() throws IOException {
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String name = "refs/heads/gone";
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@ -43,6 +43,8 @@
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package org.eclipse.jgit.internal.storage.reftable;
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import static org.eclipse.jgit.lib.RefDatabase.MAX_SYMBOLIC_REF_DEPTH;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Collection;
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@ -51,6 +53,7 @@
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import org.eclipse.jgit.internal.storage.io.BlockSource;
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import org.eclipse.jgit.lib.AnyObjectId;
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import org.eclipse.jgit.lib.Ref;
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import org.eclipse.jgit.lib.SymbolicRef;
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/** Abstract table of references. */
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public abstract class Reftable implements AutoCloseable {
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@ -218,6 +221,42 @@ public boolean hasId(AnyObjectId id) throws IOException {
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}
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}
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/**
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* Resolve a symbolic reference to populate its value.
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*
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* @param symref
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* reference to resolve.
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* @return resolved {@code symref}, or {@code null}.
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* @throws IOException
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* if references cannot be read.
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*/
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@Nullable
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public Ref resolve(Ref symref) throws IOException {
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return resolve(symref, 0);
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}
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private Ref resolve(Ref ref, int depth) throws IOException {
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if (!ref.isSymbolic()) {
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return ref;
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}
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Ref dst = ref.getTarget();
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if (MAX_SYMBOLIC_REF_DEPTH <= depth) {
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return null; // claim it doesn't exist
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}
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dst = exactRef(dst.getName());
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if (dst == null) {
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return ref;
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}
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dst = resolve(dst, depth + 1);
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if (dst == null) {
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return null; // claim it doesn't exist
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}
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return new SymbolicRef(ref.getName(), dst);
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}
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@Override
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public abstract void close() throws IOException;
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}
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