org.fisco.bcos.web3j.rlp.RlpString Maven / Gradle / Ivy

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package org.fisco.bcos.web3j.rlp;

import java.math.BigInteger;
import java.util.Arrays;
import org.fisco.bcos.web3j.utils.Numeric;

/** RLP string type. */
public class RlpString implements RlpType {
  private static final byte[] EMPTY = new byte[] {};

  private final byte[] value;

  private RlpString(byte[] value) {
    this.value = value;
  }

  public byte[] getBytes() {
    return value;
  }

  public BigInteger asPositiveBigInteger() {
    if (value.length == 0) {
      return BigInteger.ZERO;
    }
    return new BigInteger(1, value);
  }

  public String asString() {
    return Numeric.toHexString(value);
  }

  public static RlpString create(byte[] value) {
    return new RlpString(value);
  }

  public static RlpString create(byte value) {
    return new RlpString(new byte[] {value});
  }

  public static RlpString create(BigInteger value) {
    // RLP encoding only supports positive integer values
    if (value.signum() < 1) {
      return new RlpString(EMPTY);
    } else {
      byte[] bytes = value.toByteArray();
      if (bytes[0] == 0) { // remove leading zero
        return new RlpString(Arrays.copyOfRange(bytes, 1, bytes.length));
      } else {
        return new RlpString(bytes);
      }
    }
  }

  public static RlpString create(long value) {
    return create(BigInteger.valueOf(value));
  }

  public static RlpString create(String value) {
    return new RlpString(value.getBytes());
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    RlpString rlpString = (RlpString) o;

    return Arrays.equals(value, rlpString.value);
  }

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