PgpKeyId.java

package org.springframework.roo.felix.pgp;

import org.apache.commons.lang3.Validate;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPSignature;

/**
 * Represents a 10 digit hexadecimal key ID (always starts with 0x, and the rest
 * of the ID is uppercase).
 * 
 * @author Ben Alex
 * @since 1.1
 */
public class PgpKeyId implements Comparable<PgpKeyId> {
  private static final long MASK = 0xFFFFFFFFL;
  private String id;

  public PgpKeyId(final long keyId) {
    id = "0x" + String.format("%08X", MASK & keyId);
  }

  public PgpKeyId(final PGPPublicKey keyId) {
    Validate.notNull(keyId, "Key ID required");
    id = "0x" + String.format("%08X", MASK & keyId.getKeyID());
  }

  public PgpKeyId(final PGPSignature signature) {
    Validate.notNull(signature, "Signautre required");
    id = "0x" + String.format("%08X", MASK & signature.getKeyID());
  }

  public PgpKeyId(String keyId) {
    Validate.notBlank(keyId, "A key ID is required (eg 00B5050F or 0x00B5050F)");
    if (keyId.length() == 10) {
      Validate.isTrue(keyId.toLowerCase().startsWith("0x"),
          "10 character key IDs must start with 0x");
      keyId = keyId.toUpperCase(); // NB: the 0x will become uppercase,
                                   // which it shouldn't
      id = "0x" + keyId.substring(2);
    } else if (keyId.length() == 8) {
      Validate.isTrue(!keyId.toLowerCase().startsWith("0x"),
          "8 character key IDs must not start with 0x");
      keyId = keyId.toUpperCase();
      id = "0x" + keyId;
    } else {
      throw new IllegalStateException(
          "The key ID must be in a valid form (eg 00B5050F or 0x00B5050F)");
    }
  }

  public int compareTo(final PgpKeyId o) {
    if (o == null) {
      return -1;
    }
    return id.compareTo(o.id);
  }

  @Override
  public boolean equals(final Object obj) {
    if (obj instanceof PgpKeyId) {
      return id.equals(((PgpKeyId) obj).id);
    }
    return false;
  }

  public String getId() {
    return id;
  }

  @Override
  public int hashCode() {
    return id.hashCode();
  }

  @Override
  public String toString() {
    return id.toString();
  }
}