ndn-js
Version:
A JavaScript client library for Named Data Networking
158 lines (143 loc) • 5.98 kB
JavaScript
/**
* Copyright (C) 2016-2019 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* A copy of the GNU Lesser General Public License is in the file COPYING.
*/
/** @ignore */
var LOG = require('../log.js').Log.LOG;
/**
* A RegisteredPrefixTable is an internal class to hold a list of registered
* prefixes with information necessary to remove the registration later.
* @param {InterestFilterTable} interestFilterTable See removeRegisteredPrefix(),
* which may call interestFilterTable.unsetInterestFilter().
* @constructor
*/
var RegisteredPrefixTable = function RegisteredPrefixTable(interestFilterTable)
{
this.interestFilterTable_ = interestFilterTable;
this.table_ = []; // of Entry
this.removeRequests_ = []; // of number
};
exports.RegisteredPrefixTable = RegisteredPrefixTable;
/**
* Add a new entry to the table. However, if removeRegisteredPrefix was already
* called with the registeredPrefixId, don't add an entry and return false.
* @param {number} registeredPrefixId The ID from Node.getNextEntryId().
* @param {Name} prefix The name prefix.
* @param {number} relatedInterestFilterId (optional) The related
* interestFilterId for the filter set in the same registerPrefix operation. If
* omitted, set to 0.
* return {boolean} True if added an entry, false if removeRegisteredPrefix was
* already called with the registeredPrefixId.
*/
RegisteredPrefixTable.prototype.add = function
(registeredPrefixId, prefix, relatedInterestFilterId)
{
var removeRequestIndex = this.removeRequests_.indexOf(registeredPrefixId);
if (removeRequestIndex >= 0) {
// removeRegisteredPrefix was called with the registeredPrefixId returned by
// registerPrefix before we got here, so don't add a registered prefix
// table entry.
this.removeRequests_.splice(removeRequestIndex, 1);
return false;
}
this.table_.push(new RegisteredPrefixTable._Entry
(registeredPrefixId, prefix, relatedInterestFilterId));
return true;
};
/**
* Remove the registered prefix entry with the registeredPrefixId from the
* registered prefix table. This does not affect another registered prefix with
* a different registeredPrefixId, even if it has the same prefix name. If an
* interest filter was automatically created by registerPrefix, also call
* interestFilterTable_.unsetInterestFilter to remove it.
* If there is no entry with the registeredPrefixId, do nothing.
* @param {number} registeredPrefixId The ID returned from registerPrefix.
*/
RegisteredPrefixTable.prototype.removeRegisteredPrefix = function
(registeredPrefixId)
{
// Go backwards through the list so we can erase entries.
// Remove all entries even though registeredPrefixId should be unique.
var count = 0;
for (var i = this.table_.length - 1; i >= 0; --i) {
var entry = this.table_[i];
if (entry.getRegisteredPrefixId() == registeredPrefixId) {
++count;
if (entry.getRelatedInterestFilterId() > 0)
// Remove the related interest filter.
this.interestFilterTable_.unsetInterestFilter
(entry.getRelatedInterestFilterId());
this.table_.splice(i, 1);
}
}
if (count === 0)
if (LOG > 0) console.log
("removeRegisteredPrefix: Didn't find registeredPrefixId " + registeredPrefixId);
if (count === 0) {
// The registeredPrefixId was not found. Perhaps this has been called before
// the callback in registerPrefix can add to the registered prefix table.
// Add this removal request which will be checked before adding to the
// registered prefix table.
if (this.removeRequests_.indexOf(registeredPrefixId) < 0)
// Not already requested, so add the request.
this.removeRequests_.push(registeredPrefixId);
}
};
/**
* RegisteredPrefixTable._Entry holds a registeredPrefixId and information
* necessary to remove the registration later. It optionally holds a related
* interestFilterId if the InterestFilter was set in the same registerPrefix
* operation.
* Create a RegisteredPrefixTable.Entry with the given values.
* @param {number} registeredPrefixId The ID from Node.getNextEntryId().
* @param {Name} prefix The name prefix.
* @param {number} relatedInterestFilterId (optional) The related
* interestFilterId for the filter set in the same registerPrefix operation. If
* omitted, set to 0.
* @constructor
*/
RegisteredPrefixTable._Entry = function RegisteredPrefixTableEntry
(registeredPrefixId, prefix, relatedInterestFilterId)
{
this.registeredPrefixId_ = registeredPrefixId;
this.prefix_ = prefix;
this.relatedInterestFilterId_ = relatedInterestFilterId;
};
/**
* Get the registeredPrefixId given to the constructor.
* @return {number} The registeredPrefixId.
*/
RegisteredPrefixTable._Entry.prototype.getRegisteredPrefixId = function()
{
return this.registeredPrefixId_;
};
/**
* Get the name prefix given to the constructor.
* @return {Name} The name prefix.
*/
RegisteredPrefixTable._Entry.prototype.getPrefix = function()
{
return this.prefix_;
};
/**
* Get the related interestFilterId given to the constructor.
* @return {number} The related interestFilterId.
*/
RegisteredPrefixTable._Entry.prototype.getRelatedInterestFilterId = function()
{
return this.relatedInterestFilterId_;
};