Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.property;

import ch.qos.logback.core.PropertyDefinerBase;
import ch.qos.logback.core.util.OptionHelper;

import java.io.File;

In conjunction with PropertyAction sets the named variable to "true" if the file specified by path property exists, to "false" otherwise. 
Author:
Ceki Gülcü
See Also:
getPropertyValue()/**
 * In conjunction with {@link ch.qos.logback.core.joran.action.PropertyAction} sets
 * the named variable to "true" if the file specified by {@link #setPath(String) path}
 * property exists, to "false" otherwise.
 *
 * @see #getPropertyValue()
 *
 * @author Ceki Gülcü
 */
public class FileExistsPropertyDefiner extends PropertyDefinerBase {

    String path;

    public String getPath() {
        return path;
    }

    
The path for the file to search for.
Params:
path – /**
     * The path for the file to search for.
     *
     * @param path
     */
    public void setPath(String path) {
        this.path = path;
    }

    
Returns "true" if the file specified by path property exists. Returns "false" otherwise. 
Returns:
"true"|"false" depending on the existence of file/**
     * Returns "true" if the file specified by {@link #setPath(String) path} property exists.
     * Returns "false" otherwise.
     *
     * @return "true"|"false" depending on the existence of file
     */
    public String getPropertyValue() {
        if (OptionHelper.isEmpty(path)) {
            addError("The \"path\" property must be set.");
            return null;
        }

        File file = new File(path);
        return booleanAsStr(file.exists());
    }
}