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<div class="subTitle">org.osgi.service.cm</div>
<h2 title="Interface ConfigurationAdmin" class="title">Interface ConfigurationAdmin</h2>
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<pre>public interface <span class="typeNameLabel">ConfigurationAdmin</span></pre>
<div class="block">Service for administering configuration data.
<p>
The main purpose of this interface is to store bundle configuration data
persistently. This information is represented in <code>Configuration</code>
objects. The actual configuration data is a <code>Dictionary</code> of properties
inside a <code>Configuration</code> object.
<p>
There are two principally different ways to manage configurations. First
there is the concept of a Managed Service, where configuration data is
uniquely associated with an object registered with the service registry.
<p>
Next, there is the concept of a factory where the Configuration Admin service
will maintain 0 or more <code>Configuration</code> objects for a Managed Service
Factory that is registered with the Framework.
<p>
The first concept is intended for configuration data about "things/services"
whose existence is defined externally, e.g. a specific printer. Factories are
intended for "things/services" that can be created any number of times, e.g.
a configuration for a DHCP server for different networks.
<p>
Bundles that require configuration should register a Managed Service or a
Managed Service Factory in the service registry. A registration property
named <code>service.pid</code> (persistent identifier or PID) must be used to
identify this Managed Service or Managed Service Factory to the Configuration
Admin service.
<p>
When the ConfigurationAdmin detects the registration of a Managed Service, it
checks its persistent storage for a configuration object whose
<code>service.pid</code> property matches the PID service property (
<code>service.pid</code>) of the Managed Service. If found, it calls
<a href="../../../../org/osgi/service/cm/ManagedService.html#updated-java.util.Dictionary-"><code>ManagedService.updated(Dictionary)</code></a> method with the new properties.
The implementation of a Configuration Admin service must run these call-backs
asynchronously to allow proper synchronization.
<p>
When the Configuration Admin service detects a Managed Service Factory
registration, it checks its storage for configuration objects whose
<code>service.factoryPid</code> property matches the PID service property of the
Managed Service Factory. For each such <code>Configuration</code> objects, it
calls the <code>ManagedServiceFactory.updated</code> method asynchronously with
the new properties. The calls to the <code>updated</code> method of a
<code>ManagedServiceFactory</code> must be executed sequentially and not overlap
in time.
<p>
In general, bundles having permission to use the Configuration Admin service
can only access and modify their own configuration information. Accessing or
modifying the configuration of other bundles requires
<code>ConfigurationPermission[location,CONFIGURE]</code>, where location is the
configuration location.
<p>
<code>Configuration</code> objects can be <i>bound</i> to a specified bundle
location or to a region (configuration location starts with <code>?</code>). If a
location is not set, it will be learned the first time a target is
registered. If the location is learned this way, the Configuration Admin
service must detect if the bundle corresponding to the location is
uninstalled. If this occurs, the <code>Configuration</code> object must be
unbound, that is its location field is set back to <code>null</code>.
<p>
If target's bundle location matches the configuration location it is always
updated.
<p>
If the configuration location starts with <code>?</code>, that is, the location is
a region, then the configuration must be delivered to all targets registered
with the given PID. If security is on, the target bundle must have
Configuration Permission[location,TARGET], where location matches given the
configuration location with wildcards as in the Filter substring match. The
security must be verified using the
<code>Bundle.hasPermission(Object)</code> method on the target
bundle.
<p>
If a target cannot be updated because the location does not match or it has
no permission and security is active then the Configuration Admin service
must not do the normal callback.
<p>
The method descriptions of this class refer to a concept of "the calling
bundle". This is a loose way of referring to the bundle which obtained the
Configuration Admin service from the service registry. Implementations of
<code>ConfigurationAdmin</code> must use a
<code>ServiceFactory</code> to support this concept.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#SERVICE_BUNDLELOCATION">SERVICE_BUNDLELOCATION</a></span></code>
<div class="block">Configuration property naming the location of the bundle that is
associated with a a <code>Configuration</code> object.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#SERVICE_FACTORYPID">SERVICE_FACTORYPID</a></span></code>
<div class="block">Configuration property naming the Factory PID in the configuration
dictionary.</div>
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<td class="colFirst"><code><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#createFactoryConfiguration-java.lang.String-">createFactoryConfiguration</a></span>(java.lang.String factoryPid)</code>
<div class="block">Create a new factory <code>Configuration</code> object with a new PID.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#createFactoryConfiguration-java.lang.String-java.lang.String-">createFactoryConfiguration</a></span>(java.lang.String factoryPid,
java.lang.String location)</code>
<div class="block">Create a new factory <code>Configuration</code> object with a new PID.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#getConfiguration-java.lang.String-">getConfiguration</a></span>(java.lang.String pid)</code>
<div class="block">Get an existing or new <code>Configuration</code> object from the persistent
store.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#getConfiguration-java.lang.String-java.lang.String-">getConfiguration</a></span>(java.lang.String pid,
java.lang.String location)</code>
<div class="block">Get an existing <code>Configuration</code> object from the persistent store,
or create a new <code>Configuration</code> object.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/cm/ConfigurationAdmin.html#listConfigurations-java.lang.String-">listConfigurations</a></span>(java.lang.String filter)</code>
<div class="block">List the current <code>Configuration</code> objects which match the filter.</div>
</td>
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<h4>SERVICE_FACTORYPID</h4>
<pre>static final java.lang.String SERVICE_FACTORYPID</pre>
<div class="block">Configuration property naming the Factory PID in the configuration
dictionary. The property's value is of type <code>String</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.1</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.cm.ConfigurationAdmin.SERVICE_FACTORYPID">Constant Field Values</a></dd>
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<h4>SERVICE_BUNDLELOCATION</h4>
<pre>static final java.lang.String SERVICE_BUNDLELOCATION</pre>
<div class="block">Configuration property naming the location of the bundle that is
associated with a a <code>Configuration</code> object. This property can be
searched for but must not appear in the configuration dictionary for
security reason. The property's value is of type <code>String</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.1</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.osgi.service.cm.ConfigurationAdmin.SERVICE_BUNDLELOCATION">Constant Field Values</a></dd>
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<h4>createFactoryConfiguration</h4>
<pre><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a> createFactoryConfiguration(java.lang.String factoryPid)
throws java.io.IOException</pre>
<div class="block">Create a new factory <code>Configuration</code> object with a new PID.
The properties of the new <code>Configuration</code> object are <code>null</code>
until the first time that its <a href="../../../../org/osgi/service/cm/Configuration.html#update-java.util.Dictionary-"><code>Configuration.update(Dictionary)</code></a>
method is called.
<p>
It is not required that the <code>factoryPid</code> maps to a registered
Managed Service Factory.
<p>
The <code>Configuration</code> object is bound to the location of the calling
bundle. It is possible that the same factoryPid has associated
configurations that are bound to different bundles. Bundles should only
see the factory configurations that they are bound to or have the proper
permission.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>factoryPid</code> - PID of factory (not <code>null</code>).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A new <code>Configuration</code> object.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if access to persistent storage fails.</dd>
</dl>
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<h4>createFactoryConfiguration</h4>
<pre><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a> createFactoryConfiguration(java.lang.String factoryPid,
java.lang.String location)
throws java.io.IOException</pre>
<div class="block">Create a new factory <code>Configuration</code> object with a new PID.
The properties of the new <code>Configuration</code> object are <code>null</code>
until the first time that its <a href="../../../../org/osgi/service/cm/Configuration.html#update-java.util.Dictionary-"><code>Configuration.update(Dictionary)</code></a>
method is called.
<p>
It is not required that the <code>factoryPid</code> maps to a registered
Managed Service Factory.
<p>
The <code>Configuration</code> is bound to the location specified. If this
location is <code>null</code> it will be bound to the location of the first
bundle that registers a Managed Service Factory with a corresponding PID.
It is possible that the same factoryPid has associated configurations
that are bound to different bundles. Bundles should only see the factory
configurations that they are bound to or have the proper permission.
<p>
If the location starts with <code>?</code> then the configuration must be
delivered to all targets with the corresponding PID.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>factoryPid</code> - PID of factory (not <code>null</code>).</dd>
<dd><code>location</code> - A bundle location string, or <code>null</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new <code>Configuration</code> object.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if access to persistent storage fails.</dd>
<dd><code>java.lang.SecurityException</code> - when the require permissions are not available</dd>
</dl>
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<h4>getConfiguration</h4>
<pre><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a> getConfiguration(java.lang.String pid,
java.lang.String location)
throws java.io.IOException</pre>
<div class="block">Get an existing <code>Configuration</code> object from the persistent store,
or create a new <code>Configuration</code> object.
<p>
If a <code>Configuration</code> with this PID already exists in Configuration
Admin service return it. The location parameter is ignored in this case
though it is still used for a security check.
<p>
Else, return a new <code>Configuration</code> object. This new object is bound
to the location and the properties are set to <code>null</code>. If the
location parameter is <code>null</code>, it will be set when a Managed Service
with the corresponding PID is registered for the first time. If the
location starts with <code>?</code> then the configuration is bound to all
targets that are registered with the corresponding PID.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>pid</code> - Persistent identifier.</dd>
<dd><code>location</code> - The bundle location string, or <code>null</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An existing or new <code>Configuration</code> object.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if access to persistent storage fails.</dd>
<dd><code>java.lang.SecurityException</code> - when the require permissions are not available</dd>
</dl>
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<h4>getConfiguration</h4>
<pre><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a> getConfiguration(java.lang.String pid)
throws java.io.IOException</pre>
<div class="block">Get an existing or new <code>Configuration</code> object from the persistent
store.
If the <code>Configuration</code> object for this PID does not exist, create a
new <code>Configuration</code> object for that PID, where properties are
<code>null</code>. Bind its location to the calling bundle's location.
<p>
Otherwise, if the location of the existing <code>Configuration</code> object
is <code>null</code>, set it to the calling bundle's location.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>pid</code> - persistent identifier.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an existing or new <code>Configuration</code> matching the PID.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if access to persistent storage fails.</dd>
<dd><code>java.lang.SecurityException</code> - when the required permission is not available</dd>
</dl>
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<h4>listConfigurations</h4>
<pre><a href="../../../../org/osgi/service/cm/Configuration.html" title="interface in org.osgi.service.cm">Configuration</a>[] listConfigurations(java.lang.String filter)
throws java.io.IOException,
org.osgi.framework.InvalidSyntaxException</pre>
<div class="block">List the current <code>Configuration</code> objects which match the filter.
<p>
Only <code>Configuration</code> objects with non- <code>null</code> properties are
considered current. That is, <code>Configuration.getProperties()</code> is
guaranteed not to return <code>null</code> for each of the returned
<code>Configuration</code> objects.
<p>
When there is no security on then all configurations can be returned. If
security is on, the caller must have
ConfigurationPermission[location,CONFIGURE].
<p>
The syntax of the filter string is as defined in the <code>Filter</code>
class. The filter can test any configuration properties including the
following:
<ul>
<li><code>service.pid</code> - the persistent identity</li>
<li><code>service.factoryPid</code> - the factory PID, if applicable</li>
<li><code>service.bundleLocation</code> - the bundle location</li>
</ul>
The filter can also be <code>null</code>, meaning that all
<code>Configuration</code> objects should be returned.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>filter</code> - A filter string, or <code>null</code> to retrieve all
<code>Configuration</code> objects.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>All matching <code>Configuration</code> objects, or <code>null</code> if
there aren't any.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if access to persistent storage fails</dd>
<dd><code>org.osgi.framework.InvalidSyntaxException</code> - if the filter string is invalid</dd>
</dl>
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