import MessagePack for Java implementation plan 3

java-plan3/src/org/msgpack/schema/SpecificClassSchema.java

@@ -0,0 +1,122 @@
+//
+// MessagePack for Java
+//
+// Copyright (C) 2009 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+package org.msgpack.schema;
+
+import java.util.Collection;
+import java.util.List;
+import java.lang.reflect.*;
+import java.io.IOException;
+import org.msgpack.*;
+
+public class SpecificClassSchema extends ClassSchema {
+	private Class classCache;
+	private Method factoryCache;
+	private Constructor constructorCache;
+
+	public SpecificClassSchema(
+			String name, String namespace,
+			List<String> imports, List<FieldSchema> fields) {
+		super(name, namespace, imports, fields);
+	}
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public void pack(Packer pk, Object obj) throws IOException {
+		if(obj == null) {
+			pk.packNil();
+			return;
+		}
+		if(classCache == null) {
+			cacheFactory();
+		}
+		if(classCache.isInstance(obj)) {
+			((MessagePackable)obj).messagePack(pk);
+		} else {
+			// FIXME Map<String,Object>
+			throw MessageTypeException.invalidConvert(obj, this);
+		}
+	}
+
+	@Override
+	public Object convert(Object obj) throws MessageTypeException {
+		if(obj instanceof Collection) {
+			if(constructorCache == null) {
+				cacheConstructor();
+			}
+			try {
+				MessageMergeable o = (MessageMergeable)constructorCache.newInstance((Object[])null);
+				o.messageMerge(obj);
+				return o;
+			} catch (InvocationTargetException e) {
+				throw new RuntimeException("can't instantiate "+fqdn+": "+e.getMessage());
+			} catch (InstantiationException e) {
+				throw new RuntimeException("can't instantiate "+fqdn+": "+e.getMessage());
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("can't instantiate "+fqdn+": "+e.getMessage());
+			}
+
+		} else {
+			throw MessageTypeException.invalidConvert(obj, this);
+		}
+	}
+
+	public Schema getElementSchema(int index) {
+		// FIXME check index < fields.length
+		return fields[index].getSchema();
+	}
+
+	public Object createFromArray(Object[] obj) {
+		if(factoryCache == null) {
+			cacheFactory();
+		}
+		try {
+			return factoryCache.invoke(null, new Object[]{obj});
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("can't instantiate "+fqdn+": "+e.getCause());
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("can't instantiate "+fqdn+": "+e.getMessage());
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	private void cacheFactory() {
+		try {
+			classCache = Class.forName(fqdn);
+			factoryCache = classCache.getDeclaredMethod("createFromMessage", new Class[]{Object[].class});
+			factoryCache.setAccessible(true);
+		} catch(ClassNotFoundException e) {
+			throw new RuntimeException("class not found: "+fqdn);
+		} catch (NoSuchMethodException e) {
+			throw new RuntimeException("class not found: "+fqdn+": "+e.getMessage());
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	private void cacheConstructor() {
+		try {
+			classCache = Class.forName(fqdn);
+			constructorCache = classCache.getDeclaredConstructor((Class[])null);
+			constructorCache.setAccessible(true);
+		} catch(ClassNotFoundException e) {
+			throw new RuntimeException("class not found: "+fqdn);
+		} catch (NoSuchMethodException e) {
+			throw new RuntimeException("class not found: "+fqdn+": "+e.getMessage());
+		}
+	}
+}
+