/**
 * This module source stores information about the original
 * descriptor.
 */
public class DefaultMetadataFileSource implements MetadataFileSource {
    private final ModuleComponentArtifactIdentifier artifactId;
    private final File artifactFile;
    private final HashCode sha1;

    public DefaultMetadataFileSource(ModuleComponentArtifactIdentifier artifactId, File artifactFile, HashCode sha1) {
        this.artifactId = artifactId;

        String version = decoder.readString();
        String name = decoder.readString();
        byte[] sha1 = decoder.readBinary();
        DefaultMetadataFileSource source = createSource(sha1, group, module, version, name);
        return source;
    }

    private DefaultMetadataFileSource createSource(byte[] sha1, String group, String module, String version, String name) {

import org.gradle.api.internal.artifacts.ivyservice.ivyresolve.strategy.VersionSelector;
import org.gradle.api.internal.artifacts.repositories.metadata.DefaultMetadataFileSource;
import org.gradle.api.internal.component.ArtifactType;
import org.gradle.internal.component.external.model.ModuleComponentArtifactIdentifier;
import org.gradle.internal.component.external.model.ModuleDependencyMetadata;

import org.gradle.api.internal.artifacts.ivyservice.resolveengine.artifact.ResolvableArtifact;
import org.gradle.api.internal.artifacts.repositories.metadata.DefaultMetadataFileSource;
import org.gradle.api.internal.artifacts.repositories.resolver.MetadataFetchingCost;
import org.gradle.api.internal.component.ArtifactType;
import org.gradle.api.internal.tasks.DefaultTaskDependency;

        File file = gradleMetadataArtifact.getFile();
        sources.add(new ModuleDescriptorHashModuleSource(checksumService.md5(file), metaDataFromResource.isChanging()));
        sources.add(new DefaultMetadataFileSource(artifactId.getId(), file, findSha1(gradleMetadataArtifact.getMetaData(), file)));
    }

    private HashCode findSha1(ExternalResourceMetaData metaData, File artifact) {
        HashCode sha1 = metaData.getSha1();

                ExternalResourceMetaData metaData = metadataArtifact.getMetaData();
                MutableModuleSources sources = metadata.getSources();
                sources.add(new DefaultMetadataFileSource(artifact.getId(), metadataArtifactFile, findSha1(metaData, metadataArtifactFile)));
                context.appendSources(sources);
                return metadata;
            }
        }
        return null;