src/main/java/com/puppycrawl/tools/checkstyle/checks/sizes/FileLengthCheck.java

////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2017 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

package com.puppycrawl.tools.checkstyle.checks.sizes;

import java.io.File;

import com.puppycrawl.tools.checkstyle.StatelessCheck;
import com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck;
import com.puppycrawl.tools.checkstyle.api.FileText;

/**
 * <p>
 * Checks for long source files.
 * </p>
 * <p>
 * Rationale: If a source file becomes very long it is hard to understand.
 * Therefore long classes should usually be refactored into several
 * individual classes that focus on a specific task.
 * </p>
 * <p>
 * The default maximum file length is 2000 lines. To change the maximum
 * number of lines, set property max.
 * </p>
 * <p>
 * An example of how to configure the check is:
 * </p>
 * <pre>
 * &lt;module name="FileLength"/&gt;
 * </pre>
 * <p>
 * An example of how to configure the check so that it accepts files with at
 * most 1500 lines is:
 * </p>
 * <pre>
 * &lt;module name="FileLength"&gt;
 *    &lt;property name="max" value="1500"/&gt;
 * &lt;/module&gt;
 * </pre>
 * @author Lars Kühne
 */
@StatelessCheck
public class FileLengthCheck extends AbstractFileSetCheck {

    /**
     * A key is pointing to the warning message text in "messages.properties"
     * file.
     */
    public static final String MSG_KEY = "maxLen.file";

    /** Default maximum number of lines. */
    private static final int DEFAULT_MAX_LINES = 2000;

    /** The maximum number of lines. */
    private int max = DEFAULT_MAX_LINES;

    @Override
    protected void processFiltered(File file, FileText fileText) {
        if (fileText.size() > max) {
            log(1, MSG_KEY, fileText.size(), max);
        }
    }

    /**
     * Sets the maximum length of a Java source file.
     * @param length the maximum length of a Java source file
     */
    public void setMax(int length) {
        max = length;
    }

}