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/*
* Artifactural
* Copyright (c) 2018-2021.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.artifactural.base.artifact;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedList;
import java.util.List;
import java.util.stream.Collectors;
import net.minecraftforge.artifactural.api.artifact.ArtifactMetadata;
public class SimpleArtifactMetadata implements ArtifactMetadata {
private final List<Entry> entries = new LinkedList<>();
private String hash = null;
public SimpleArtifactMetadata() {
}
private SimpleArtifactMetadata(SimpleArtifactMetadata parent, Entry entry) {
this.entries.addAll(parent.entries);
this.entries.add(entry);
}
@Override
public ArtifactMetadata with(String key, String value) {
return new SimpleArtifactMetadata(this, new Entry(key, value));
}
@Override
public String getHash() {
if (hash != null) return hash;
try {
String str = entries.stream().map(Entry::toString).collect(Collectors.joining("\n"));
MessageDigest digest = MessageDigest.getInstance("SHA-1");
byte[] hashBytes = digest.digest(str.getBytes());
StringBuilder hashBuilder = new StringBuilder();
for (byte b : hashBytes) {
hashBuilder.append(String.format("%02x", b));
}
return hash = hashBuilder.toString();
} catch (NoSuchAlgorithmException ex) {
throw new RuntimeException(ex);
}
}
@Override
public String toString() {
return "SimpleArtifactMetadata(" + entries.toString() + ", " + getHash() + ")";
}
private static class Entry {
private final String key, value;
private Entry(String key, String value) {
this.key = key;
this.value = value;
}
@Override
public String toString() {
return '[' + key + ',' + value + ']';
}
}
}
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