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PortletPreferences (Java Portlet Specification V2.0 1.0 API)
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javax.portlet</FONT>
<BR>
Interface PortletPreferences</H2>
<HR>
<DL>
<DT><PRE>public interface <B>PortletPreferences</B></DL>
</PRE>
<P>
The <CODE>PortletPreferences</CODE> interface allows the portlet to store
configuration data. It is not the
purpose of this interface to replace general purpose databases.
<p>
There are two different types of preferences:
<ul>
<li>modifiable preferences - these preferences can be changed by the
portlet in any standard portlet mode (<code>EDIT, HELP, VIEW</code>).
Per default every preference is modifiable.
<li>read-only preferences - these preferences cannot be changed by the
portlet in any standard portlet mode, but may be changed by administrative modes.
Preferences are read-only, if the are defined in the
deployment descriptor with <code>read-only</code> set to <code>true</code>,
or if the portlet container restricts write access.
</ul>
<p>
Changes are persisted when the <code>store</code> method is called. The <code>store</code> method
can only be invoked within the scope of a <code>processAction</code> call.
Changes that are not persisted are discarded when the
<code>processAction</code> or <code>render</code> method ends.
<P>
<P>
<HR>
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<CODE> java.util.Map<java.lang.String,java.lang.String[]></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#getMap()">getMap</A></B>()</CODE>
<BR>
Returns a <code>Map</code> of the preferences.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Enumeration<java.lang.String></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#getNames()">getNames</A></B>()</CODE>
<BR>
Returns all of the keys that have an associated value,
or an empty <code>Enumeration</code> if no keys are
available.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#getValue(java.lang.String, java.lang.String)">getValue</A></B>(java.lang.String key,
java.lang.String def)</CODE>
<BR>
Returns the first String value associated with the specified key of this preference.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#getValues(java.lang.String, java.lang.String[])">getValues</A></B>(java.lang.String key,
java.lang.String[] def)</CODE>
<BR>
Returns the String array value associated with the specified key in this preference.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#isReadOnly(java.lang.String)">isReadOnly</A></B>(java.lang.String key)</CODE>
<BR>
Returns true, if the value of this key is defined as read-only and thus
cannot be modified by the user.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#reset(java.lang.String)">reset</A></B>(java.lang.String key)</CODE>
<BR>
Resets or removes the value associated with the specified key.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#setValue(java.lang.String, java.lang.String)">setValue</A></B>(java.lang.String key,
java.lang.String value)</CODE>
<BR>
Associates the specified String value with the specified key in this
preference.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#setValues(java.lang.String, java.lang.String[])">setValues</A></B>(java.lang.String key,
java.lang.String[] values)</CODE>
<BR>
Associates the specified String array value with the specified key in this
preference.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/portlet/PortletPreferences.html#store()">store</A></B>()</CODE>
<BR>
Commits all changes made to the preferences via the
<code>set</code> methods in the persistent store.</TD>
</TR>
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<A NAME="isReadOnly(java.lang.String)"><!-- --></A><H3>
isReadOnly</H3>
<PRE>
boolean <B>isReadOnly</B>(java.lang.String key)</PRE>
<DL>
<DD>Returns true, if the value of this key is defined as read-only and thus
cannot be modified by the user.
<p>
Modifiable preferences can be changed by the
portlet in any standard portlet mode (<code>EDIT, HELP, VIEW</code>).
Per default every preference is modifiable.
<p>
Read-only preferences cannot be changed by the
portlet in any standard portlet mode, but inside of custom modes,
like the <code>CONFIG</code> mode, it may be allowed changing them.
<p>
Preferences are read-only, if they are defined in the
deployment descriptor with <code>read-only</code> set to <code>true</code>,
or if the portlet container restricts write access.
<p>
Note that even if this call returns <code>false</code> and the
preference key is modifiable in general it does not mean that it
is modifiable in the scope of the current request, e.g. if this
request is a render request.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>false, if the value of this key can be changed, or
if the key is not known
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>key</code> is <code>null</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="getValue(java.lang.String, java.lang.String)"><!-- --></A><H3>
getValue</H3>
<PRE>
java.lang.String <B>getValue</B>(java.lang.String key,
java.lang.String def)</PRE>
<DL>
<DD>Returns the first String value associated with the specified key of this preference.
If there is one or more preference values associated with the given key
it returns the first associated value.
If there are no preference values associated with the given key, or the
backing preference database is unavailable, it returns the given
default value.
A <code>null</code> value is treated as a non-existent value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key for which the associated value is to be returned<DD><CODE>def</CODE> - the value to be returned in the event that there is no
value available associated with this <code>key</code>.
<DT><B>Returns:</B><DD>the value associated with <code>key</code>, or <code>def</code>
if no value is associated with <code>key</code>, or the backing
store is inaccessible.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>key</code> is <code>null</code>. (A
<code>null</code> value for <code>def</code> <i>is</i> permitted.)<DT><B>See Also:</B><DD><A HREF="../../javax/portlet/PortletPreferences.html#getValues(java.lang.String, java.lang.String[])"><CODE>getValues(String, String[])</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getValues(java.lang.String, java.lang.String[])"><!-- --></A><H3>
getValues</H3>
<PRE>
java.lang.String[] <B>getValues</B>(java.lang.String key,
java.lang.String[] def)</PRE>
<DL>
<DD>Returns the String array value associated with the specified key in this preference.
<p>Returns the specified default if there is no value
associated with the key, or if the backing store is inaccessible.
A <code>null</code> value is treated as a non-existent value.
<p>If the implementation supports <i>stored defaults</i> and such a
default exists and is accessible, it is used in favor of the
specified default.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key for which associated value is to be returned.<DD><CODE>def</CODE> - the value to be returned in the event that this
preference node has no value associated with <code>key</code>
or the associated value cannot be interpreted as a String array,
or the backing store is inaccessible.
<DT><B>Returns:</B><DD>the String array value associated with
<code>key</code>, or <code>def</code> if the
associated value does not exist.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>key</code> is <code>null</code>. (A
<code>null</code> value for <code>def</code> <i>is</i> permitted.)<DT><B>See Also:</B><DD><A HREF="../../javax/portlet/PortletPreferences.html#getValue(java.lang.String, java.lang.String)"><CODE>getValue(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setValue(java.lang.String, java.lang.String)"><!-- --></A><H3>
setValue</H3>
<PRE>
void <B>setValue</B>(java.lang.String key,
java.lang.String value)
throws <A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></PRE>
<DL>
<DD>Associates the specified String value with the specified key in this
preference.
<p>
The key cannot be <code>null</code>, but <code>null</code> values
for the value parameter are allowed.
<p>
If the same key contained already a <code>String</code> or <code>String[]</code>
value it must be replaced by the new value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the specified value is to be associated.<DD><CODE>value</CODE> - value to be associated with the specified key.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></CODE> - if this preference cannot be modified for this request
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if key is <code>null</code>,
or <code>key.length()</code>
or <code>value.length</code> are to long. The maximum length
for key and value are implementation specific.<DT><B>See Also:</B><DD><A HREF="../../javax/portlet/PortletPreferences.html#setValues(java.lang.String, java.lang.String[])"><CODE>setValues(String, String[])</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setValues(java.lang.String, java.lang.String[])"><!-- --></A><H3>
setValues</H3>
<PRE>
void <B>setValues</B>(java.lang.String key,
java.lang.String[] values)
throws <A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></PRE>
<DL>
<DD>Associates the specified String array value with the specified key in this
preference.
<p>
The key cannot be <code>null</code>, but <code>null</code> values
in the values parameter are allowed.
<p>
If the same key contained already a <code>String</code> or <code>String[]</code>
value it must be replaced by the new value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the value is to be associated<DD><CODE>values</CODE> - values to be associated with key
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if key is <code>null</code>, or
<code>key.length()</code>
is to long or <code>value.size</code> is to large. The maximum
length for key and maximum size for value are implementation specific.
<DD><CODE><A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></CODE> - if this preference cannot be modified for this request<DT><B>See Also:</B><DD><A HREF="../../javax/portlet/PortletPreferences.html#setValue(java.lang.String, java.lang.String)"><CODE>setValue(String,String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getNames()"><!-- --></A><H3>
getNames</H3>
<PRE>
java.util.Enumeration<java.lang.String> <B>getNames</B>()</PRE>
<DL>
<DD>Returns all of the keys that have an associated value,
or an empty <code>Enumeration</code> if no keys are
available.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an Enumeration of the keys that have an associated value,
or an empty <code>Enumeration</code> if no keys are
available.</DL>
</DD>
</DL>
<HR>
<A NAME="getMap()"><!-- --></A><H3>
getMap</H3>
<PRE>
java.util.Map<java.lang.String,java.lang.String[]> <B>getMap</B>()</PRE>
<DL>
<DD>Returns a <code>Map</code> of the preferences.
<p>
The values in the returned <code>Map</code> are from type
String array (<code>String[]</code>).
<p>
If no preferences exist this method returns an empty <code>Map</code>.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an immutable <code>Map</code> containing preference names as
keys and preference values as map values, or an empty <code>Map</code>
if no preference exist. The keys in the preference
map are of type String. The values in the preference map are of type
String array (<code>String[]</code>).</DL>
</DD>
</DL>
<HR>
<A NAME="reset(java.lang.String)"><!-- --></A><H3>
reset</H3>
<PRE>
void <B>reset</B>(java.lang.String key)
throws <A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></PRE>
<DL>
<DD>Resets or removes the value associated with the specified key.
<p>
If this implementation supports stored defaults, and there is such
a default for the specified preference, the given key will be
reset to the stored default.
<p>
If there is no default available the key will be removed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - to reset
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if key is <code>null</code>.
<DD><CODE><A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></CODE> - if this preference cannot be modified for this request</DL>
</DD>
</DL>
<HR>
<A NAME="store()"><!-- --></A><H3>
store</H3>
<PRE>
void <B>store</B>()
throws java.io.IOException,
<A HREF="../../javax/portlet/ValidatorException.html" title="class in javax.portlet">ValidatorException</A></PRE>
<DL>
<DD>Commits all changes made to the preferences via the
<code>set</code> methods in the persistent store.
<P>
If this call returns successful, all changes are made
persistent. If this call fails, no changes are made
in the persistent store. This call is an atomic operation
regardless of how many preference attributes have been modified.
<P>
All changes made to preferences not followed by a call
to the <code>store</code> method are discarded when the
portlet finishes the <code>processAction</code> method.
<P>
If a validator is defined for this preferences in the
deployment descriptor, this validator is called before
the actual store is performed to check whether the given
preferences are valid. If this check fails a
<code>ValidatorException</code> is thrown.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if changes cannot be written into
the backend store
<DD><CODE><A HREF="../../javax/portlet/ValidatorException.html" title="class in javax.portlet">ValidatorException</A></CODE> - if the validation performed by the
associated validator fails
<DD><CODE>java.lang.IllegalStateException</CODE> - if this method is called inside a render call<DT><B>See Also:</B><DD><A HREF="../../javax/portlet/PreferencesValidator.html" title="interface in javax.portlet"><CODE>PreferencesValidator</CODE></A></DL>
</DD>
</DL>
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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