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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java | |
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Diffstat (limited to 'libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java')
-rw-r--r-- | libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java b/libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java new file mode 100644 index 000000000..7475a61bd --- /dev/null +++ b/libjava/classpath/java/beans/beancontext/BeanContextServiceProvider.java @@ -0,0 +1,138 @@ +/* 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); +} |