com.sap.cloud.security.ams.dcn.engine.AttributeNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jakarta-ams Show documentation

Client Library for integrating Jakarta EE applications with SAP Authorization Management Service (AMS)

The newest version!

/************************************************************************
 * © 2019-2024 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cloud.security.ams.dcn.engine;

import com.sap.cloud.security.ams.dcl.client.el.AttributeName;
import com.sap.cloud.security.ams.dcl.client.pdp.Attributes;
import java.util.Objects;

/** Leaf {@link EvaluationNode} representing an unresolved attribute. */
public class AttributeNode extends EvaluationNode {

  private final AttributeName path;

  /**
   * Creates a new instance representing the attribute with the given {@link AttributeName}.
   *
   * @param path the path of the attribute
   */
  AttributeNode(AttributeName path) {
    this.path = path;
  }

  /**
   * If this node represents an attribute for which a value other than {@link
   * Attributes.SpecialValue#UNKNOWN} is provided by the given {@link ValueAccessor}, then this
   * method returns a new {@link ValueNode} instance created from that value. Otherwise, this method
   * returns this node, i.e. the unresolved attribute is kept in the evaluation tree.
   *
   * @param valueAccessor accessor for attribute values
   * @return resolved {@link ValueNode} or this {@link AttributeNode}
   */
  @Override
  public EvaluationNode evaluate(ValueAccessor valueAccessor) {
    Object value = valueAccessor.attributeValue(path);
    if (Attributes.SpecialValue.UNKNOWN.equals(value)) {
      return this;
    }
    return ValueNode.create(value);
  }

  /**
   * Converts this node to a condition object by returning its {@link AttributeName}.
   *
   * @return the path of the attribute
   */
  @Override
  public Object toCondition() {
    return path;
  }

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

    AttributeNode that = (AttributeNode) o;
    return Objects.equals(path, that.path);
  }

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

  @Override
  public String toString() {
    return "Attr{" + path + '}';
  }
}