package cn.home1.oss.lib.common.crypto;
   
   import static org.apache.commons.lang3.StringUtils.isBlank;
   import static org.apache.commons.lang3.StringUtils.isNotBlank;
   
   import com.fasterxml.jackson.annotation.JsonInclude;
   
   import lombok.EqualsAndHashCode;
   import lombok.Getter;
  import lombok.NoArgsConstructor;
  import lombok.Setter;
  import lombok.extern.slf4j.Slf4j;
  
  import org.codehaus.jackson.map.annotate.JsonSerialize;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlRootElement;
  
  /**
   * Created by zhanghaolun on 16/11/16.
   */
  @XmlRootElement(name = "key") // Jaxb2RootElementHttpMessageConverter
  @XmlAccessorType(XmlAccessType.FIELD)
  @JsonInclude(JsonInclude.Include.NON_EMPTY) // for Jackson 2.x
  @JsonSerialize(include = JsonSerialize.Inclusion.NON_EMPTY) // for Jackson 1.x
  @EqualsAndHashCode
  @NoArgsConstructor
  @Setter
  @Getter
  @Slf4j
  public class KeyExpression {
  
    private static final String KEY_SPEC_NOT_PRESENT = "key spec not present, use our keygen to generate valid keys";
  
    private String spec;
    private String value;
  
    KeyExpression(final String spec, final String value) {
      if (isBlank(spec)) {
        log.error(KEY_SPEC_NOT_PRESENT);
        throw new IllegalArgumentException(KEY_SPEC_NOT_PRESENT);
      }
      this.spec = spec;
      this.value = value;
    }
  
    public KeyExpression(final String expression) {
      if (isNotBlank(expression)) {
        final int index = expression.indexOf(CryptoConstants.COLON);
        if (index <= 0) {
          log.error(KEY_SPEC_NOT_PRESENT);
          throw new IllegalArgumentException(KEY_SPEC_NOT_PRESENT);
        }
        this.spec = expression.substring(0, index);
        this.value = expression.substring(index + 1);
      }
    }
  
    @Override
    public String toString() {
      return "" + this.spec + CryptoConstants.COLON + this.value;
    }
  
    public Boolean isPresent() {
      return isNotBlank(this.spec) && isNotBlank(this.value);
    }
  }