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Add support for listing Dbi flags #146

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Merged
bp-alex merged 1 commit into from
Apr 15, 2020
Merged

Add support for listing Dbi flags #146

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28 changes: 28 additions & 0 deletions src/main/java/org/lmdbjava/Dbi.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,10 +20,15 @@

package org.lmdbjava;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

import static java.util.Objects.requireNonNull;
import static jnr.ffi.Memory.allocateDirect;

import jnr.ffi.NativeType;
import static jnr.ffi.NativeType.ADDRESS;
import jnr.ffi.Pointer;
import jnr.ffi.byref.PointerByReference;
Expand Down Expand Up @@ -489,6 +494,29 @@ public Stat stat(final Txn<T> txn) {
stat.f5_ms_entries.longValue());
}

/*
* Return DbiFlags for this Dbi.
*
* @param txn transaction handle (not null; not committed)
* @return the list of flags this Dbi was created with
*/
public List<DbiFlags> listFlags(final Txn<T> txn) {
final Pointer resultPtr = allocateDirect(RUNTIME, NativeType.UINT);
checkRc(LIB.mdb_dbi_flags(txn.pointer(), ptr, resultPtr));

final int flags = resultPtr.getInt(0);

final List<DbiFlags> result = new ArrayList<>();

for (final DbiFlags flag : DbiFlags.values()) {
if (MaskedFlag.isSet(flags, flag)) {
result.add(flag);
}
}

return result;
}

private void clean() {
if (cleaned) {
return;
Expand Down
2 changes: 1 addition & 1 deletion src/main/java/org/lmdbjava/Library.java
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Expand Up @@ -222,7 +222,7 @@ int mdb_cursor_put(@In Pointer cursor, @In Pointer key, @In Pointer data,

void mdb_dbi_close(@In Pointer env, @In Pointer dbi);

int mdb_dbi_flags(@In Pointer txn, @In Pointer dbi, int flags);
int mdb_dbi_flags(@In Pointer txn, @In Pointer dbi, @Out Pointer flags);

int mdb_dbi_open(@In Pointer txn, @In byte[] name, int flags,
@In Pointer dbiPtr);
Expand Down
12 changes: 12 additions & 0 deletions src/test/java/org/lmdbjava/DbiTest.java
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Expand Up @@ -49,6 +49,7 @@
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.MatcherAssert.assertThat;
import org.hamcrest.Matchers;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.collection.IsEmptyCollection.empty;
import org.junit.After;
Expand All @@ -62,6 +63,7 @@
import org.lmdbjava.Dbi.DbFullException;
import static org.lmdbjava.DbiFlags.MDB_CREATE;
import static org.lmdbjava.DbiFlags.MDB_DUPSORT;
import static org.lmdbjava.DbiFlags.MDB_REVERSEKEY;
import org.lmdbjava.Env.MapFullException;
import static org.lmdbjava.Env.create;
import static org.lmdbjava.EnvFlags.MDB_NOSUBDIR;
Expand Down Expand Up @@ -474,4 +476,14 @@ public void testParallelWritesStress() {
}
});
}

@Test
public void listsFlags() {
final Dbi<ByteBuffer> dbi = env.openDbi(DB_1, MDB_CREATE, MDB_DUPSORT, MDB_REVERSEKEY);

try (Txn<ByteBuffer> txn = env.txnRead()) {
final List<DbiFlags> flags = dbi.listFlags(txn);
assertThat(flags, containsInAnyOrder(MDB_DUPSORT, MDB_REVERSEKEY));
}
}
}