001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2018 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 */
035@StatelessCheck
036public class HeaderCheck extends AbstractHeaderCheck {
037
038    /**
039     * A key is pointing to the warning message text in "messages.properties"
040     * file.
041     */
042    public static final String MSG_MISSING = "header.missing";
043
044    /**
045     * A key is pointing to the warning message text in "messages.properties"
046     * file.
047     */
048    public static final String MSG_MISMATCH = "header.mismatch";
049
050    /** Empty array to avoid instantiations. */
051    private static final int[] EMPTY_INT_ARRAY = new int[0];
052
053    /** The header lines to ignore in the check, sorted. */
054    private int[] ignoreLines = EMPTY_INT_ARRAY;
055
056    /**
057     * Returns true if lineNo is header lines or false.
058     * @param lineNo a line number
059     * @return if {@code lineNo} is one of the ignored header lines.
060     */
061    private boolean isIgnoreLine(int lineNo) {
062        return Arrays.binarySearch(ignoreLines, lineNo) >= 0;
063    }
064
065    /**
066     * Checks if a code line matches the required header line.
067     * @param lineNumber the line number to check against the header
068     * @param line the line contents
069     * @return true if and only if the line matches the required header line
070     */
071    private boolean isMatch(int lineNumber, String line) {
072        // skip lines we are meant to ignore
073        return isIgnoreLine(lineNumber + 1)
074            || getHeaderLines().get(lineNumber).equals(line);
075    }
076
077    /**
078     * Set the lines numbers to ignore in the header check.
079     * @param list comma separated list of line numbers to ignore in header.
080     */
081    public void setIgnoreLines(int... list) {
082        if (list.length == 0) {
083            ignoreLines = EMPTY_INT_ARRAY;
084        }
085        else {
086            ignoreLines = new int[list.length];
087            System.arraycopy(list, 0, ignoreLines, 0, list.length);
088            Arrays.sort(ignoreLines);
089        }
090    }
091
092    @Override
093    protected void processFiltered(File file, FileText fileText) {
094        if (getHeaderLines().size() > fileText.size()) {
095            log(1, MSG_MISSING);
096        }
097        else {
098            for (int i = 0; i < getHeaderLines().size(); i++) {
099                if (!isMatch(i, fileText.get(i))) {
100                    log(i + 1, MSG_MISMATCH, getHeaderLines().get(i));
101                    break;
102                }
103            }
104        }
105    }
106
107    @Override
108    protected void postProcessHeaderLines() {
109        // no code
110    }
111
112}