hydra.langs.tinkerpop.mappings.ValueSpec Maven / Gradle / Ivy

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package hydra.langs.tinkerpop.mappings;

import java.io.Serializable;

/**
 * A mapping specification producing values (usually literal values) whose type is understood in context
 */
public abstract class ValueSpec implements Serializable {
  public static final hydra.core.Name NAME = new hydra.core.Name("hydra/langs/tinkerpop/mappings.ValueSpec");
  
  private ValueSpec () {
  
  }
  
  public abstract  R accept(Visitor visitor) ;
  
  public interface Visitor {
    R visit(Value instance) ;
    
    R visit(Pattern instance) ;
  }
  
  public interface PartialVisitor extends Visitor {
    default R otherwise(ValueSpec instance) {
      throw new IllegalStateException("Non-exhaustive patterns when matching: " + (instance));
    }
    
    default R visit(Value instance) {
      return otherwise((instance));
    }
    
    default R visit(Pattern instance) {
      return otherwise((instance));
    }
  }
  
  /**
   * A trivial no-op specification which passes the entire value
   */
  public static final class Value extends hydra.langs.tinkerpop.mappings.ValueSpec implements Serializable {
    public Value () {
    
    }
    
    @Override
    public boolean equals(Object other) {
      if (!(other instanceof Value)) {
        return false;
      }
      Value o = (Value) (other);
      return true;
    }
    
    @Override
    public int hashCode() {
      return 0;
    }
    
    @Override
    public  R accept(Visitor visitor) {
      return visitor.visit(this);
    }
  }
  
  /**
   * A compact path representing the function, e.g. engine-${engineInfo/model/name}
   */
  public static final class Pattern extends hydra.langs.tinkerpop.mappings.ValueSpec implements Serializable {
    /**
     * A compact path representing the function, e.g. engine-${engineInfo/model/name}
     */
    public final String value;
    
    public Pattern (String value) {
      this.value = value;
    }
    
    @Override
    public boolean equals(Object other) {
      if (!(other instanceof Pattern)) {
        return false;
      }
      Pattern o = (Pattern) (other);
      return value.equals(o.value);
    }
    
    @Override
    public int hashCode() {
      return 2 * value.hashCode();
    }
    
    @Override
    public  R accept(Visitor visitor) {
      return visitor.visit(this);
    }
  }
}