/****************************************************************************
 ** @license
 ** This demo file is part of yFiles for HTML 2.6.
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 ** 72070 Tuebingen, Germany. All rights reserved.
 **
 ** yFiles demo files exhibit yFiles for HTML functionalities. Any redistribution
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 ** demo is shipped with are allowed to use the demo source code as basis
 ** for their own yFiles for HTML powered applications. Use of such programs is
 ** governed by the rights and conditions as set out in the yFiles for HTML
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 ** THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY EXPRESS OR IMPLIED
 ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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import {
  DefaultPortCandidate,
  FreeNodePortLocationModel,
  IEnumerable,
  IInputModeContext,
  INode,
  IPortCandidate,
  List,
  PortCandidateProviderBase,
  PortCandidateValidity
} from 'yfiles'

/**
 * This port candidate provider does not allow edges to start/end at a particular node.
 */
export default class RedPortCandidateProvider extends PortCandidateProviderBase {
  node

  /**
   * Creates a new instance of {@link BluePortCandidateProvider}.
   * @param {!INode} node The given node.
   */
  constructor(node) {
    super()
    this.node = node
  }

  /**
   * Returns a list with a single invalid port candidate. This candidate is
   * located in the center of the node to display the invalid port
   * highlight at that location.
   * Note that the various variants of getPortCandidates of
   * {@link PortCandidateProviderBase} delegate to this method.
   * This can be used to provide the same candidates for all use-cases.
   * @param {!IInputModeContext} context The context for which the candidates should be provided
   * @see Overrides {@link PortCandidateProviderBase.getPortCandidates}
   * @returns {!IEnumerable.<IPortCandidate>}
   */
  getPortCandidates(context) {
    const candidates = new List()
    const portCandidate = new DefaultPortCandidate(
      this.node,
      FreeNodePortLocationModel.NODE_CENTER_ANCHORED
    )
    portCandidate.validity = PortCandidateValidity.INVALID
    candidates.add(portCandidate)
    return candidates
  }
}
