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Widening.

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git-svn-id: https://samskivert.googlecode.com/svn/trunk@2971 6335cc39-0255-0410-8fd6-9bcaacd3b74c
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samskivert
2010-12-19 18:58:04 +00:00
parent cb82f080d6
commit df7df145e6
1 changed files with 19 additions and 28 deletions
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src/main/java/com/samskivert/util/PropertiesUtil.java
+19 -28
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@@ -36,12 +36,11 @@ import com.samskivert.io.StreamUtil;
public class PropertiesUtil
{
/**
* Extracts all properties from the supplied properties object with
* the specified prefix, removes the prefix from the key for those
* properties and inserts them into a new properties object which is
* then returned. This is useful for extracting properties from a
* global configuration object that must be passed to a service that
* expects it's own private properties (JDBC for example).
* Extracts all properties from the supplied properties object with the specified prefix,
* removes the prefix from the key for those properties and inserts them into a new properties
* object which is then returned. This is useful for extracting properties from a global
* configuration object that must be passed to a service that expects it's own private
* properties (JDBC for example).
*
* The property file might look like so:
*
@@ -56,9 +55,8 @@ public class PropertiesUtil
* my_happy_other_param=my_happy_other_value
* </pre>
*
* This can be supplied to <code>getSubProperties()</code> with a
* prefix of <code>"jdbc"</code> and the following properties would be
* returned:
* This can be supplied to <code>getSubProperties()</code> with a prefix of <code>"jdbc"</code>
* and the following properties would be returned:
*
* <pre>
* driver=foo.bar.Driver
@@ -67,8 +65,7 @@ public class PropertiesUtil
* password=is your uncle
* </pre>
*/
public static Properties getSubProperties (
Properties source, String prefix)
public static Properties getSubProperties (Properties source, String prefix)
{
Properties dest = new Properties();
extractSubProperties(source, dest, prefix);
@@ -76,9 +73,8 @@ public class PropertiesUtil
}
/**
* Like {@link #getSubProperties(Properties,String)} with the
* additional functionality of loading up defaults for the
* sub-properties which are identified by the
* Like {@link #getSubProperties(Properties,String)} with the additional functionality of
* loading up defaults for the sub-properties which are identified by the
* <code>defaultsPrefix</code> string.
*/
public static Properties getSubProperties (
@@ -96,24 +92,21 @@ public class PropertiesUtil
}
/**
* Returns a filtered version of the specified properties that first
* looks for a property starting with the given prefix, then looks for
* a property without the prefix. For example, passing the prefix "alt"
* and using the following properties:
* Returns a filtered version of the specified properties that first looks for a property
* starting with the given prefix, then looks for a property without the prefix. For example,
* passing the prefix "alt" and using the following properties:
*
* <pre>
* alt.texture = sand.png
* lighting = off
* </pre>
*
* ...would return "sand.png" for the property "texture" and "off" for
* the property "lighting". Unlike {@link #getSubProperties}, the object
* returned by this method references, rather than copies, the underlying
* properties. Only the {@link Properties#getProperty} methods are
* ...would return "sand.png" for the property "texture" and "off" for the property "lighting".
* Unlike {@link #getSubProperties}, the object returned by this method references, rather than
* copies, the underlying properties. Only the {@link Properties#getProperty} methods are
* guaranteed to work correctly on the returned object.
*/
public static Properties getFilteredProperties (
final Properties source, String prefix)
public static Properties getFilteredProperties (final Properties source, String prefix)
{
final String dprefix = prefix + ".";
return new Properties() {
@@ -121,8 +114,7 @@ public class PropertiesUtil
return getProperty(key, null);
}
@Override public String getProperty (String key, String defaultValue) {
return source.getProperty(dprefix + key,
source.getProperty(key, defaultValue));
return source.getProperty(dprefix + key, source.getProperty(key, defaultValue));
}
@Override public Enumeration<?> propertyNames () {
return new Enumeration<Object>() {
@@ -157,8 +149,7 @@ public class PropertiesUtil
/**
* A helper function used by the {@link #getSubProperties} methods.
*/
protected static void extractSubProperties (
Properties source, Properties dest, String prefix)
protected static void extractSubProperties (Properties source, Properties dest, String prefix)
{
// extend the prefix to contain a dot
prefix = prefix + ".";