/*
    * Copyright (C) 2011, 2021 IBM Corporation 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.api;
  
  import java.io.File;
  import java.io.InputStream;
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.patch.PatchApplier;
  import org.eclipse.jgit.patch.PatchApplier.Result;
  
  /**
   * Apply a patch to files and/or to the index.
   *
   * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-apply.html"
   *      >Git documentation about apply</a>
   * @since 2.0
   */
  public class ApplyCommand extends GitCommand<ApplyResult> {
  
  	private InputStream in;
  
  	/**
  	 * Constructs the command.
  	 *
  	 * @param local
  	 */
  	ApplyCommand(Repository local) {
  		super(local);
  		if (local == null) {
  			throw new NullPointerException(JGitText.get().repositoryIsRequired);
  		}
  	}
  
  	/**
  	 * Set patch
  	 *
  	 * @param in
  	 *            the patch to apply
  	 * @return this instance
  	 */
  	public ApplyCommand setPatch(InputStream in) {
  		checkCallable();
  		this.in = in;
  		return this;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 *
  	 * <p>
  	 * Executes the {@code ApplyCommand} command with all the options and
  	 * parameters collected by the setter methods (e.g.
  	 * {@link #setPatch(InputStream)} of this class. Each instance of this class
  	 * should only be used for one invocation of the command. Don't call this
  	 * method twice on an instance.
  	 */
  	@Override
  	public ApplyResult call() throws GitAPIException {
  		checkCallable();
  		setCallable(false);
  		ApplyResult r = new ApplyResult();
  		PatchApplier patchApplier = new PatchApplier(repo);
  		Result applyResult = patchApplier.applyPatch(in);
  		for (String p : applyResult.getPaths()) {
  			r.addUpdatedFile(new File(repo.getWorkTree(), p));
  		}
  		return r;
  	}
  }