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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/gnu/java/beans/decoder/ObjectHandler.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java')
-rw-r--r-- | libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java b/libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java new file mode 100644 index 000000000..ececfbbe2 --- /dev/null +++ b/libjava/classpath/gnu/java/beans/decoder/ObjectHandler.java @@ -0,0 +1,169 @@ +/* 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 <object> 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.")); + } +} |