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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java
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+/* gnu.java.beans.decoder.ObjectHandler
+ Copyright (C) 2004 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 gnu.java.beans.decoder;
+
+import java.beans.ExceptionListener;
+
+import org.xml.sax.Attributes;
+
+/** An ObjectHandler parses the &lt;object&gt; tag and thereby creates various
+ * Context implementations.
+ *
+ * @author Robert Schuster
+ *
+ */
+public class ObjectHandler extends AbstractElementHandler
+{
+ /**
+ * XXX: Can all results be stored with an object id?
+ *
+ *
+ * @param PersistenceParser
+ */
+ ObjectHandler(ElementHandler parent)
+ {
+ super(parent, true);
+ }
+
+ protected Context startElement(Attributes attributes, ExceptionListener exceptionListener)
+ throws AssemblyException
+ {
+ String className = attributes.getValue("class");
+ String methodName = attributes.getValue("method");
+ String fieldName = attributes.getValue("field");
+ String index = attributes.getValue("index");
+ String propertyName = attributes.getValue("property");
+ String id = attributes.getValue("id");
+ String idRef = attributes.getValue("idref");
+
+ /* first check if we just want to access an existing object (idref present)
+ *
+ * note: <object idref="foo" method="bar"/> is not valid to call method "bar"
+ * on the object with id "foo". Instead this should return the object "foo"
+ * itself. The right way to this is:
+ * <object idref="foo">
+ * <object method="bar"/>
+ * </object>
+ *
+ * This means that if idref is present class, method, field, index and
+ * property are obsolete.
+ */
+ if (idRef != null)
+ // reactivates an existing object and giving it another name if id exists
+ return new ObjectContext(id, getObject(idRef));
+
+ // decides whether we are in a static (className present) or dynamic context
+ if (className != null)
+ {
+ try
+ {
+ Class klass = instantiateClass(className);
+
+ // class name exists which means that we are in a static context.
+ // so we may want to ...
+ // access a static field if the fieldName exists
+ if (fieldName != null)
+ {
+ try
+ {
+ return new ObjectContext(id,
+ klass.getField(fieldName).get(null));
+ }
+ catch (NoSuchFieldException nsfe)
+ {
+ throw new AssemblyException(nsfe);
+ }
+ catch (IllegalAccessException iae)
+ {
+ throw new AssemblyException(iae);
+ }
+ }
+
+ // (falling through is important!)
+ // run a constructor if methodName is "new" or null
+ if (methodName == null || methodName.equals("new"))
+ return new ConstructorContext(id, klass);
+
+ // (falling through is important!)
+ // run a static method on the given class (if methodName exists, which is implied already)
+ return new StaticMethodContext(id, klass, methodName);
+ // XXX: should fail if unexpected attributes are present?
+ }
+ catch (ClassNotFoundException cnfe)
+ {
+ throw new AssemblyException(cnfe);
+ }
+ }
+ else
+ {
+ // className does not exist which means we are in the context of
+ // some object and want to ...
+ // access the get(int index) method if index != null
+ if (index != null)
+ {
+ try
+ {
+ // Note: http://java.sun.com/products/jfc/tsc/articles/persistence3/ says
+ // that <void index="4"/> will make up a get()-call. But this is wrong because
+ // <void/> tags never return values (to the surrounding context)
+ return new IndexContext(id, Integer.parseInt(index));
+ }
+ catch (NumberFormatException nfe)
+ {
+ throw new AssemblyException(nfe);
+ }
+ }
+
+ // access a method if methodName exists
+ if (methodName != null)
+ return new MethodContext(id, methodName);
+
+ // (falling through is important!)
+ // access a property if a propertyName exists
+ if (propertyName != null && propertyName.length() > 0)
+ // this is reported as an ordinary method access where the propertyName is
+ // converted into a 'getter'-method name: convert first character of property name
+ // to upper case and prepend 'get'
+ // Note: This will be a getter-method because the <object> tag implies that a return
+ // value is expected.
+ return new PropertyContext(id, propertyName);
+ }
+
+ throw new AssemblyException(new IllegalArgumentException("Wrong or missing attributes for <object> tag."));
+ }
+}