/*
    * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
   */
  
  package org.eclipse.jgit.revwalk.filter;
  
  import java.io.IOException;
  import java.util.Collection;
  
  import org.eclipse.jgit.errors.IncorrectObjectTypeException;
  import org.eclipse.jgit.errors.MissingObjectException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.revwalk.RevWalk;
  
  /**
   * Includes a commit if any subfilters include the same commit.
   * <p>
   * Classic shortcut behavior is used, so evaluation of the
   * {@link org.eclipse.jgit.revwalk.filter.RevFilter#include(RevWalk, RevCommit)}
   * method stops as soon as a true result is obtained. Applications can improve
   * filtering performance by placing faster filters that are more likely to
   * accept a result earlier in the list.
   */
  public abstract class OrRevFilter extends RevFilter {
  	/**
  	 * Create a filter with two filters, one of which must match.
  	 *
  	 * @param a
  	 *            first filter to test.
  	 * @param b
  	 *            second filter to test.
  	 * @return a filter that must match at least one input filter.
  	 */
  	public static RevFilteref="../../../../../org/eclipse/jgit/revwalk/filter/RevFilter.html#RevFilter">RevFilter../../../../../org/eclipse/jgit/revwalk/filter/RevFilter.html#RevFilter">RevFilter create(RevFilteref="../../../../../org/eclipse/jgit/revwalk/filter/RevFilter.html#RevFilter">RevFilter a, RevFilter b) {
  		if (a == ALL || b == ALL)
  			return ALL;
  		return new Binary(a, b);
  	}
  
  	/**
  	 * Create a filter around many filters, one of which must match.
  	 *
  	 * @param list
  	 *            list of filters to match against. Must contain at least 2
  	 *            filters.
  	 * @return a filter that must match at least one input filter.
  	 */
  	public static RevFilter../../../../../org/eclipse/jgit/revwalk/filter/RevFilter.html#RevFilter">RevFilter create(RevFilter[] list) {
  		if (list.length == 2)
  			return create(list[0], list[1]);
  		if (list.length < 2)
  			throw new IllegalArgumentException(JGitText.get().atLeastTwoFiltersNeeded);
  		final RevFiltervFilter.html#RevFilter">RevFilter[] subfilters = new RevFilter[list.length];
  		System.arraycopy(list, 0, subfilters, 0, list.length);
  		return new List(subfilters);
  	}
  
  	/**
  	 * Create a filter around many filters, one of which must match.
  	 *
  	 * @param list
  	 *            list of filters to match against. Must contain at least 2
  	 *            filters.
  	 * @return a filter that must match at least one input filter.
  	 */
  	public static RevFilter create(Collection<RevFilter> list) {
  		if (list.size() < 2)
  			throw new IllegalArgumentException(JGitText.get().atLeastTwoFiltersNeeded);
  		final RevFiltervFilter.html#RevFilter">RevFilter[] subfilters = new RevFilter[list.size()];
  		list.toArray(subfilters);
  		if (subfilters.length == 2)
  			return create(subfilters[0], subfilters[1]);
  		return new List(subfilters);
  	}
  
  	private static class Binary extends OrRevFilter {
  		private final RevFilter a;
  
  		private final RevFilter b;
  
  		private final boolean requiresCommitBody;
  
  		Binary(RevFilter="../../../../../org/eclipse/jgit/revwalk/filter/RevFilter.html#RevFilter">RevFilter one, RevFilter two) {
  			a = one;
  			b = two;
  			requiresCommitBody = a.requiresCommitBody()
  					|| b.requiresCommitBody();
  		}
  
  		@Override
  		public boolean include(RevWalk walker, RevCommit c)
 				throws MissingObjectException, IncorrectObjectTypeException,
 				IOException {
 			return a.include(walker, c) || b.include(walker, c);
 		}
 
 		@Override
 		public boolean requiresCommitBody() {
 			return requiresCommitBody;
 		}
 
 		@Override
 		public RevFilter clone() {
 			return new Binary(a.clone(), b.clone());
 		}
 
 		@SuppressWarnings("nls")
 		@Override
 		public String toString() {
 			return "(" + a.toString() + " OR " + b.toString() + ")";
 		}
 	}
 
 	private static class List extends OrRevFilter {
 		private final RevFilter[] subfilters;
 
 		private final boolean requiresCommitBody;
 
 		List(RevFilter[] list) {
 			subfilters = list;
 
 			boolean rcb = false;
 			for (RevFilter filter : subfilters)
 				rcb |= filter.requiresCommitBody();
 			requiresCommitBody = rcb;
 		}
 
 		@Override
 		public boolean include(RevWalk walker, RevCommit c)
 				throws MissingObjectException, IncorrectObjectTypeException,
 				IOException {
 			for (RevFilter f : subfilters) {
 				if (f.include(walker, c))
 					return true;
 			}
 			return false;
 		}
 
 		@Override
 		public boolean requiresCommitBody() {
 			return requiresCommitBody;
 		}
 
 		@Override
 		public RevFilter clone() {
 			final RevFilterfilter/RevFilter.html#RevFilter">RevFilter[] s = new RevFilter[subfilters.length];
 			for (int i = 0; i < s.length; i++)
 				s[i] = subfilters[i].clone();
 			return new List(s);
 		}
 
 		@Override
 		public String toString() {
 			final StringBuilder r = new StringBuilder();
 			r.append("("); //$NON-NLS-1$
 			for (int i = 0; i < subfilters.length; i++) {
 				if (i > 0)
 					r.append(" OR "); //$NON-NLS-1$
 				r.append(subfilters[i].toString());
 			}
 			r.append(")"); //$NON-NLS-1$
 			return r.toString();
 		}
 	}
 }