// Compress adjacent spaces (a space is determined by
	// unicode.IsSpace() internally here) to one space and return
	return strings.Join(strings.Fields(input), " ")
}

// checkMetaHeaders will check if the metadata from header/url is the same with the one from signed headers
func checkMetaHeaders(signedHeadersMap http.Header, r *http.Request) APIErrorCode {
	// check values from http header
	for k, val := range r.Header {

		},
		{
			name:    "incorrect X-Amz-Credential",
			fv:      defaultFormVals.Clone().Set(xhttp.AmzCredential, "incorrect"),
			wantErr: policyCondFailedErr,
		},
		{
			name:    "incorrect metadata uuid",
			fv:      defaultFormVals.Clone().Set(xhttp.AmzMetaUUID, "151274"),
			wantErr: "Invalid according to Policy: Policy Condition failed: [eq, $x-amz-meta-uuid, 14365123651274]",
		},
		{

      - tutorial/security/oauth2-jwt.md
    - tutorial/middleware.md
    - tutorial/cors.md
    - tutorial/sql-databases.md
    - tutorial/bigger-applications.md
    - tutorial/background-tasks.md
    - tutorial/metadata.md
    - tutorial/static-files.md
    - tutorial/testing.md
    - tutorial/debugging.md
  - Advanced User Guide:
    - advanced/index.md
    - advanced/path-operation-advanced-configuration.md

import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.ArtifactUtils;
import org.apache.maven.artifact.metadata.ResolutionGroup;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;

/**
 * DefaultMavenMetadataCache
 */
@Named
@Singleton

     * or greater, otherwise build will fail. How the number to be obtained is left to user (ie by inspecting
     * snapshot repository metadata or alike).
     *
     * Note: this feature is present in Maven 3.9.7 but with different key: <code>maven.buildNumber</code>. In Maven 4
     * as part of cleanup effort this key was renamed to properly reflect its purpose.

func Test_metaCacheEntries_merge(t *testing.T) {
	org := loadMetacacheSampleEntries(t)
	a, b := org.shallowClone(), org.shallowClone()
	be := b.entries()
	for i := range be {
		//  Modify b so it isn't deduplicated.
		be[i].metadata = []byte("something-else")
	}
	// Merge b into a
	a.merge(b, -1)
	//nolint:gocritic
	want := append(loadMetacacheSampleNames, loadMetacacheSampleNames...)
	sort.Strings(want)
	got := a.entries().names()

		// Bucket migration operations
		// ExportBucketMetaHandler
		adminRouter.Methods(http.MethodGet).Path(adminVersion + "/export-bucket-metadata").HandlerFunc(
			adminMiddleware(adminAPI.ExportBucketMetadataHandler))
		// ImportBucketMetaHandler
		adminRouter.Methods(http.MethodPut).Path(adminVersion + "/import-bucket-metadata").HandlerFunc(
			adminMiddleware(adminAPI.ImportBucketMetadataHandler))

		// Remote Tier management operations

	if len(newKeys) == 0 {
		*x = nil
		return true
	}

	// Reserialize...
	x.serialize(plSize, newKeys, newVals)
	return true
}

// xlMetaV2TrimData will trim any data from the metadata without unmarshalling it.
// If any error occurs the unmodified data is returned.
func xlMetaV2TrimData(buf []byte) []byte {
	metaBuf, maj, minor, err := checkXL2V1(buf)
	if err != nil {
		return buf
	}

          val clean = entry.cleanFiles[i]
          fileSystem.atomicMove(dirty, clean)
          val oldLength = entry.lengths[i]
          // TODO check null behaviour
          val newLength = fileSystem.metadata(clean).size ?: 0
          entry.lengths[i] = newLength
          size = size - oldLength + newLength
        }
      } else {
        fileSystem.deleteIfExists(dirty)
      }
    }

     *
     * @param item the item to delete
     */
    public abstract void delete(T item);

    /**
     * A paginated list implementation that wraps another list and provides
     * pagination metadata and functionality.
     *
     * @param <E> the type of elements in this list
     */
    public static class PagingList<E> implements List<E> {
        /** The underlying list containing the actual data. */