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When getting a key that does not exist then return an empty Optional

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This commit is contained in:
Paul Campbell 2018-06-07 22:25:47 +01:00
parent a0fc7c28c5
commit 265bd61a11
2 changed files with 30 additions and 0 deletions
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14
src/main/java/net/kemitix/gitdb/GitDBBranch.java
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@ -25,6 +25,8 @@ import lombok.AccessLevel;
import lombok.RequiredArgsConstructor;
import org.eclipse.jgit.lib.Ref;
import java.util.Optional;
/**
* API for interacting with a branch in a GirDB.
*
@ -44,4 +46,16 @@ public class GitDBBranch {
public static GitDBBranch withRef(final Ref ref) {
return new GitDBBranch(ref);
}
/**
* Lookup a value for the key.
*
* @param key the key to lookup
* @param valueClass the expected class of the value
* @param <T> the Class of the value
* @return an Optional containing the value, if it exists, or empty if not
*/
public <T> Optional<T> get(final String key, final Class<T> valueClass) {
return Optional.empty();
}
}

16
src/test/java/net/kemitix/gitdb/GitDBTest.java
View file

@ -1,5 +1,6 @@
package net.kemitix.gitdb;
import org.assertj.core.api.Assumptions;
import org.assertj.core.api.WithAssertions;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
@ -13,6 +14,8 @@ import java.io.*;
import java.nio.file.*;
import java.util.Optional;
import static org.assertj.core.api.Assumptions.assumeThat;
@ExtendWith(MockitoExtension.class)
class GitDBTest implements WithAssertions {
@ -193,6 +196,19 @@ class GitDBTest implements WithAssertions {
// Given a valid GitDbBranch handle
// When getting a key that does not exist then return an empty Optional
@Test
void getKey_whenKeyNotExist_thenReturnEmptyOptional() throws IOException {
//given
final GitDB gitDB = newGitDBRepo(dirDoesNotExist());
final Optional<GitDBBranch> branchOptional = gitDB.branch("master");
assumeThat(branchOptional).isNotEmpty();
final GitDBBranch master = branchOptional.get();
//when
final Optional<String> value = master.get("unknown", String.class);
//then
assertThat(value).isEmpty();
}
// When putting a key/value pair then a GitDbBranch is returned
// When getting a key that does exist then the value is returned inside an Optional
// When removing a key that does not exist then the GitDbBranch is returned