Java Properties Get getProperty(Properties props, String propname)

Description

Check first for a particular property in the System Properties, so that the -Dprop="value" command line arg mechanism can be used to override values defined in the passed in property file.

License

Open Source License

Parameter

Parameter	Description
props	- property set in which to look.
propname	- name of the property to lookup.

Declaration

public static String getProperty(Properties props, String propname)

Method Source Code

//package com.java2s;

import java.util.*;

public class Main {
    /**/*from  w ww. j a  v  a 2 s. c  om*/
     * Check first for a particular property in the System Properties, so that the -Dprop="value" command line arg
     * mechanism can be used to override values defined in the passed in property file.  This is especially useful
     * for defining the marc.source property to define which file to operate on, in a shell script loop.
     *
     * @param props    - property set in which to look.
     * @param propname - name of the property to lookup.
     * @returns String - value stored for that property (or null if it doesn't exist)
     */
    public static String getProperty(Properties props, String propname) {
        return getProperty(props, propname, null);
    }

    /**
     * Check first for a particular property in the System Properties, so that the -Dprop="value" command line arg
     * mechanism can be used to override values defined in the passed in property file.  This is especially useful
     * for defining the marc.source property to define which file to operate on, in a shell script loop.
     *
     * @param props    - property set in which to look.
     * @param propname - name of the property to lookup.
     * @param defVal   - the default value to use if property is not defined
     * @returns String - value stored for that property (or the  if it doesn't exist)
     */
    public static String getProperty(Properties props, String propname, String defVal) {
        String prop;
        if ((prop = System.getProperty(propname)) != null) {
            return (prop);
        }
        if (props != null && (prop = props.getProperty(propname)) != null) {
            return (prop);
        }
        return defVal;
    }
}