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+/* java.beans.beancontext.BeanContextServiceProvider
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.beans.beancontext;
+
+import java.util.Iterator;
+
+/**
+ * An actual factory for services.
+ * <P>
+ *
+ * It is the <code>BeanContextServiceProvider</code>'s responsibility to
+ * register itself with whatever <code>BeanContextServices</code> object
+ * it wishes to provide services through using the
+ * <code>addService()</code> method.
+ * <P>
+ *
+ * If for some reason it can no longer provide services for a particular
+ * class, this class must invoke
+ * <code>BeanContextServices.revokeService(serviceClass,this,true)</code>
+ * for all the places it has registered the service.
+ *
+ * @author John Keiser
+ * @since JDK1.2
+ */
+
+public interface BeanContextServiceProvider {
+	/**
+	 * Get a service.
+	 * Called from <code>BeanContextServices.getService()</code>.
+	 *
+	 * <p>If the requested service class is not available, or if this
+	 * <code>BeanContextServiceProvider</code> chooses not honor the
+	 * request for some reason, then this method will return
+	 * <code>null</code>.</p>
+	 *
+	 * This method may throw unchecked exceptions, so watch out.
+	 *
+	 * @param services the <code>BeanContextServices</code> that wants
+	 *        to get the service.  Only weak references to this will
+	 *        be retained, and it will never be changed, only queried
+	 *        in a read-only manner.
+	 * @param requestor the actual requestor of the service.  Only
+	 *        weak references to this will be retained, and it will
+	 *        never be changed, only queried in a read-only manner.
+	 * @param serviceClass the <code>Class</code> of the service being
+	 *        requested.
+	 * @param serviceSelector a parameter to customize the service
+	 *        returned with.
+	 * @return an instance of <code>serviceClass</code> (such that
+	 *        <code>instanceof</code> serviceClass is true), or
+	 *        <code>null</code>.
+	 * @see java.beans.beancontext.BeanContextServices#getService(java.beans.beancontext.BeanContextChild,java.lang.Object,java.lang.Class,java.lang.Object,java.beans.beancontext.BeanContextServiceRevokedListener)
+	 */
+	Object getService(BeanContextServices services, Object requestor, Class serviceClass, Object serviceSelector);
+
+	/**
+	 * Release the service.
+	 * <P>
+	 *
+	 * Called by <code>BeanContextServices.releaseService()</code>.
+	 * <P>
+	 *
+	 * Most <code>BeanContextServiceProvider</code>s won't have to do
+	 * anything here.
+	 *
+	 * @param services the <code>BeanContextServices</code> that wants
+	 *        to release the service.  Only weak references to this will
+	 *        be retained, and it will never be changed, only queried
+	 *        in a read-only manner.
+	 * @param requestor the original requestor of the service.
+	 * @param service the service to relinquish
+	 * @see java.beans.beancontext.BeanContextServices#releaseService(java.beans.beancontext.BeanContextChild,java.lang.Object,java.lang.Object)
+	 */
+	void releaseService(BeanContextServices services, Object requestor, Object service);
+
+	/**
+	 * Get a list of valid service selectors for the specified service class.
+	 * This method is called from
+	 * <code>BeanContextServices.getCurrentServiceSelectors()</code>.
+	 * <P>
+	 *
+	 * If the specified service class does not have a finite number of
+	 * valid service selectors, it should return <code>null</code>.
+	 * If it takes a general <code>Integer</code> parameter, for
+	 * example, you may as well return <code>null</code> or the poor
+	 * soul who called this method will be iterating all day.
+	 * <P>
+	 *
+	 * If it has no valid service selectors, it should still return an empty
+	 * <code>Iterator</code>.
+	 *
+	 * @param services the <code>BeanContextServices</code> that wants
+	 *        to get the service selectors.  Only weak references to this will
+	 *        be retained, and it will never be changed, only queried
+	 *        in a read-only manner.
+	 * @param serviceClass the service class to get selectors for.
+	 * @return a list of valid service selectors for the service
+	 *         class, or <code>null</code>.
+	 * @see java.beans.beancontext.BeanContextServices#getCurrentServiceSelectors(java.lang.Class)
+	 */
+	Iterator getCurrentServiceSelectors(BeanContextServices services, Class serviceClass);
+}