001    /*
002     * SonarQube, open source software quality management tool.
003     * Copyright (C) 2008-2014 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * SonarQube is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * SonarQube is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public License
017     * along with this program; if not, write to the Free Software Foundation,
018     * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019     */
020    package org.sonar.api.issue.batch;
021    
022    import org.sonar.api.BatchExtension;
023    import org.sonar.api.issue.Issue;
024    
025    /**
026     * <p>An issue filter is an object that allows filtering of {@link Issue}s on batch side, preventing them from being persisted.</p>
027     * @since 4.0
028     *
029     */
030    public interface IssueFilter extends BatchExtension {
031    
032      /**
033       * The <code>accept</code> method is called for each {@link Issue} created during analysis, to check if it has to be persisted. Examples of use cases are:
034       * <ul>
035       *  <li>Ignoring or enforcing rules on specific resources</li>
036       *  <li>Switching-off an issue based on its context (<code>//NOSONAR</code> comments, semantic annotations)</li>
037       * </ul>
038       * The <code>chain</code> parameter allows for fine control of the filtering logic: it is each filter's duty to either pass the issue to the next filter, by calling
039       * the {@link IssueFilterChain#accept(org.sonar.api.issue.Issue)} method, or return directly if the issue has to be accepted or not
040       * @param issue the issue being filtered
041       * @param chain the rest of the filters
042       * @return <code>true</code> to accept the issue, <code>false</code> to reject it, {@link IssueFilterChain#accept(org.sonar.api.issue.Issue)} to let the other filters decide.
043       */
044      boolean accept(Issue issue, IssueFilterChain chain);
045    }