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ManagedProperties (Commons Discovery (Version 0.5-SNAPSHOT))
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org.apache.commons.discovery.tools</FONT>
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Class ManagedProperties</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.commons.discovery.tools.ManagedProperties</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>ManagedProperties</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
<p>This class may disappear in the future, or be moved to another project..
</p>
<p>Extend the concept of System properties to a hierarchical scheme
based around class loaders. System properties are global in nature,
so using them easily violates sound architectural and design principles
for maintaining separation between components and runtime environments.
Nevertheless, there is a need for properties broader in scope than
class or class instance scope.
</p>
<p>This class is one solution.
</p>
<p>Manage properties according to a secure
scheme similar to that used by classloaders:
<ul>
<li><code>ClassLoader</code>s are organized in a tree hierarchy.</li>
<li>each <code>ClassLoader</code> has a reference
to a parent <code>ClassLoader</code>.</li>
<li>the root of the tree is the bootstrap <code>ClassLoader</code>er.</li>
<li>the youngest decendent is the thread context class loader.</li>
<li>properties are bound to a <code>ClassLoader</code> instance
<ul>
<li><i>non-default</i> properties bound to a parent <code>ClassLoader</code>
instance take precedence over all properties of the same name bound
to any decendent.
Just to confuse the issue, this is the default case.</li>
<li><i>default</i> properties bound to a parent <code>ClassLoader</code>
instance may be overriden by (default or non-default) properties of
the same name bound to any decendent.
</li>
</ul>
</li>
<li>System properties take precedence over all other properties</li>
</ul>
</p>
<p>This is not a perfect solution, as it is possible that
different <code>ClassLoader</code>s load different instances of
<code>ScopedProperties</code>. The 'higher' this class is loaded
within the <code>ClassLoader</code> hierarchy, the more usefull
it will be.
</p>
<P>
<P>
<HR>
<P>
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<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#ManagedProperties()">ManagedProperties</A></B>()</CODE>
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<B>Method Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.util.Properties</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#getProperties()">getProperties</A></B>()</CODE>
<BR>
This is an expensive operation.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#getProperty(java.lang.ClassLoader, java.lang.String)">getProperty</A></B>(java.lang.ClassLoader classLoader,
java.lang.String propertyName)</CODE>
<BR>
Get value for property bound to the class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#getProperty(java.lang.ClassLoader, java.lang.String, java.lang.String)">getProperty</A></B>(java.lang.ClassLoader classLoader,
java.lang.String propertyName,
java.lang.String dephault)</CODE>
<BR>
Get value for property bound to the class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#getProperty(java.lang.String)">getProperty</A></B>(java.lang.String propertyName)</CODE>
<BR>
Get value for property bound to the current thread context class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#getProperty(java.lang.String, java.lang.String)">getProperty</A></B>(java.lang.String propertyName,
java.lang.String dephault)</CODE>
<BR>
Get value for property bound to the current thread context class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.util.Enumeration<java.lang.String></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#propertyNames()">propertyNames</A></B>()</CODE>
<BR>
Return list of all property names.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#setLog(org.apache.commons.logging.Log)">setLog</A></B>(org.apache.commons.logging.Log _log)</CODE>
<BR>
<B>Deprecated.</B> <I>This method is not thread-safe</I></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#setProperties(java.util.Map)">setProperties</A></B>(java.util.Map<?,?> newProperties)</CODE>
<BR>
Set property values for <code>Properties</code> bound to the
current thread context class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#setProperties(java.util.Map, boolean)">setProperties</A></B>(java.util.Map<?,?> newProperties,
boolean isDefault)</CODE>
<BR>
Set property values for <code>Properties</code> bound to the
current thread context class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#setProperty(java.lang.String, java.lang.String)">setProperty</A></B>(java.lang.String propertyName,
java.lang.String value)</CODE>
<BR>
Set value for property bound to the current thread context class loader.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html#setProperty(java.lang.String, java.lang.String, boolean)">setProperty</A></B>(java.lang.String propertyName,
java.lang.String value,
boolean isDefault)</CODE>
<BR>
Set value for property bound to the current thread context class loader.</TD>
</TR>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
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<P>
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<A NAME="ManagedProperties()"><!-- --></A><H3>
ManagedProperties</H3>
<PRE>
public <B>ManagedProperties</B>()</PRE>
<DL>
</DL>
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<A NAME="setLog(org.apache.commons.logging.Log)"><!-- --></A><H3>
setLog</H3>
<PRE>
<FONT SIZE="-1">@Deprecated
</FONT>public static void <B>setLog</B>(org.apache.commons.logging.Log _log)</PRE>
<DL>
<DD><B>Deprecated.</B> <I>This method is not thread-safe</I>
<P>
<DD>Sets the <code>Log</code> for this class.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>_log</CODE> - This class <code>Log</code></DL>
</DD>
</DL>
<HR>
<A NAME="getProperty(java.lang.String)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public static java.lang.String <B>getProperty</B>(java.lang.String propertyName)</PRE>
<DL>
<DD>Get value for property bound to the current thread context class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>propertyName</CODE> - property name.
<DT><B>Returns:</B><DD>property value if found, otherwise default.</DL>
</DD>
</DL>
<HR>
<A NAME="getProperty(java.lang.String, java.lang.String)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public static java.lang.String <B>getProperty</B>(java.lang.String propertyName,
java.lang.String dephault)</PRE>
<DL>
<DD>Get value for property bound to the current thread context class loader.
If not found, then return default.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>propertyName</CODE> - property name.<DD><CODE>dephault</CODE> - default value.
<DT><B>Returns:</B><DD>property value if found, otherwise default.</DL>
</DD>
</DL>
<HR>
<A NAME="getProperty(java.lang.ClassLoader, java.lang.String)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public static java.lang.String <B>getProperty</B>(java.lang.ClassLoader classLoader,
java.lang.String propertyName)</PRE>
<DL>
<DD>Get value for property bound to the class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classLoader</CODE> - The classloader used to load resources.<DD><CODE>propertyName</CODE> - property name.
<DT><B>Returns:</B><DD>property value if found, otherwise default.</DL>
</DD>
</DL>
<HR>
<A NAME="getProperty(java.lang.ClassLoader, java.lang.String, java.lang.String)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public static java.lang.String <B>getProperty</B>(java.lang.ClassLoader classLoader,
java.lang.String propertyName,
java.lang.String dephault)</PRE>
<DL>
<DD>Get value for property bound to the class loader.
If not found, then return default.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classLoader</CODE> - The classloader used to load resources.<DD><CODE>propertyName</CODE> - property name.<DD><CODE>dephault</CODE> - default value.
<DT><B>Returns:</B><DD>property value if found, otherwise default.</DL>
</DD>
</DL>
<HR>
<A NAME="setProperty(java.lang.String, java.lang.String)"><!-- --></A><H3>
setProperty</H3>
<PRE>
public static void <B>setProperty</B>(java.lang.String propertyName,
java.lang.String value)</PRE>
<DL>
<DD>Set value for property bound to the current thread context class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>propertyName</CODE> - property name<DD><CODE>value</CODE> - property value (non-default) If null, remove the property.</DL>
</DD>
</DL>
<HR>
<A NAME="setProperty(java.lang.String, java.lang.String, boolean)"><!-- --></A><H3>
setProperty</H3>
<PRE>
public static void <B>setProperty</B>(java.lang.String propertyName,
java.lang.String value,
boolean isDefault)</PRE>
<DL>
<DD>Set value for property bound to the current thread context class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>propertyName</CODE> - property name<DD><CODE>value</CODE> - property value. If null, remove the property.<DD><CODE>isDefault</CODE> - determines if property is default or not.
A non-default property cannot be overriden.
A default property can be overriden by a property
(default or non-default) of the same name bound to
a decendent class loader.</DL>
</DD>
</DL>
<HR>
<A NAME="setProperties(java.util.Map)"><!-- --></A><H3>
setProperties</H3>
<PRE>
public static void <B>setProperties</B>(java.util.Map<?,?> newProperties)</PRE>
<DL>
<DD>Set property values for <code>Properties</code> bound to the
current thread context class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newProperties</CODE> - name/value pairs to be bound</DL>
</DD>
</DL>
<HR>
<A NAME="setProperties(java.util.Map, boolean)"><!-- --></A><H3>
setProperties</H3>
<PRE>
public static void <B>setProperties</B>(java.util.Map<?,?> newProperties,
boolean isDefault)</PRE>
<DL>
<DD>Set property values for <code>Properties</code> bound to the
current thread context class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newProperties</CODE> - name/value pairs to be bound<DD><CODE>isDefault</CODE> - determines if properties are default or not.
A non-default property cannot be overriden.
A default property can be overriden by a property
(default or non-default) of the same name bound to
a decendent class loader.</DL>
</DD>
</DL>
<HR>
<A NAME="propertyNames()"><!-- --></A><H3>
propertyNames</H3>
<PRE>
public static java.util.Enumeration<java.lang.String> <B>propertyNames</B>()</PRE>
<DL>
<DD>Return list of all property names. This is an expensive
operation: ON EACH CALL it walks through all property lists
associated with the current context class loader upto
and including the bootstrap class loader.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The list of all property names</DL>
</DD>
</DL>
<HR>
<A NAME="getProperties()"><!-- --></A><H3>
getProperties</H3>
<PRE>
public static java.util.Properties <B>getProperties</B>()</PRE>
<DL>
<DD>This is an expensive operation.
ON EACH CALL it walks through all property lists
associated with the current context class loader upto
and including the bootstrap class loader.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>Returns a <code>java.util.Properties</code> instance
that is equivalent to the current state of the scoped
properties, in that getProperty() will return the same value.
However, this is a copy, so setProperty on the
returned value will not effect the scoped properties.</DL>
</DD>
</DL>
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