001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2017 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.checks.header;
021
022import java.io.File;
023import java.util.Arrays;
024
025import com.puppycrawl.tools.checkstyle.StatelessCheck;
026import com.puppycrawl.tools.checkstyle.api.FileText;
027
028/**
029 * Checks the header of the source against a fixed header file.
030 * In default configuration,if header is not specified,
031 * the default value of header is set to null
032 * and the check does not rise any violations.
033 *
034 * @author Lars K├╝hne
035 */
036@StatelessCheck
037public class HeaderCheck extends AbstractHeaderCheck {
038
039    /**
040     * A key is pointing to the warning message text in "messages.properties"
041     * file.
042     */
043    public static final String MSG_MISSING = "header.missing";
044
045    /**
046     * A key is pointing to the warning message text in "messages.properties"
047     * file.
048     */
049    public static final String MSG_MISMATCH = "header.mismatch";
050
051    /** Empty array to avoid instantiations. */
052    private static final int[] EMPTY_INT_ARRAY = new int[0];
053
054    /** The header lines to ignore in the check, sorted. */
055    private int[] ignoreLines = EMPTY_INT_ARRAY;
056
057    /**
058     * Returns true if lineNo is header lines or false.
059     * @param lineNo a line number
060     * @return if {@code lineNo} is one of the ignored header lines.
061     */
062    private boolean isIgnoreLine(int lineNo) {
063        return Arrays.binarySearch(ignoreLines, lineNo) >= 0;
064    }
065
066    /**
067     * Checks if a code line matches the required header line.
068     * @param lineNumber the line number to check against the header
069     * @param line the line contents
070     * @return true if and only if the line matches the required header line
071     */
072    private boolean isMatch(int lineNumber, String line) {
073        // skip lines we are meant to ignore
074        return isIgnoreLine(lineNumber + 1)
075            || getHeaderLines().get(lineNumber).equals(line);
076    }
077
078    /**
079     * Set the lines numbers to ignore in the header check.
080     * @param list comma separated list of line numbers to ignore in header.
081     */
082    public void setIgnoreLines(int... list) {
083        if (list.length == 0) {
084            ignoreLines = EMPTY_INT_ARRAY;
085        }
086        else {
087            ignoreLines = new int[list.length];
088            System.arraycopy(list, 0, ignoreLines, 0, list.length);
089            Arrays.sort(ignoreLines);
090        }
091    }
092
093    @Override
094    protected void processFiltered(File file, FileText fileText) {
095        if (getHeaderLines().size() > fileText.size()) {
096            log(1, MSG_MISSING);
097        }
098        else {
099            for (int i = 0; i < getHeaderLines().size(); i++) {
100                if (!isMatch(i, fileText.get(i))) {
101                    log(i + 1, MSG_MISMATCH, getHeaderLines().get(i));
102                    break;
103                }
104            }
105        }
106    }
107
108    @Override
109    protected void postProcessHeaderLines() {
110        // no code
111    }
112}