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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.binding.erlang.impl.types;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.sca.binding.erlang.impl.TypeMismatchException;
import com.ericsson.otp.erlang.OtpErlangList;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangTuple;
/**
* @version $Rev$ $Date$
*/
public class TypeHelpersProxy {
private static Map<Class<?>, TypeHelper> primitiveTypes = null;
static {
// initiate type helpers
primitiveTypes = new HashMap<Class<?>, TypeHelper>();
primitiveTypes.put(boolean.class, new BooleanTypeHelper());
primitiveTypes.put(short.class, new ShortTypeHelper());
primitiveTypes.put(byte.class, new ByteTypeHelper());
primitiveTypes.put(char.class, new CharTypeHelper());
primitiveTypes.put(int.class, new IntTypeHelper());
primitiveTypes.put(long.class, new LongTypeHelper());
primitiveTypes.put(float.class, new FloatTypeHelper());
primitiveTypes.put(double.class, new DoubleTypeHelper());
primitiveTypes.put(String.class, new StringTypeHelper());
primitiveTypes.put(Boolean.class, primitiveTypes.get(boolean.class));
primitiveTypes.put(Character.class, primitiveTypes.get(char.class));
primitiveTypes.put(Short.class, primitiveTypes.get(char.class));
primitiveTypes.put(Byte.class, primitiveTypes.get(byte.class));
primitiveTypes.put(Short.class, primitiveTypes.get(short.class));
primitiveTypes.put(Integer.class, primitiveTypes.get(int.class));
primitiveTypes.put(Long.class, primitiveTypes.get(long.class));
primitiveTypes.put(Float.class, primitiveTypes.get(float.class));
primitiveTypes.put(Double.class, primitiveTypes.get(double.class));
primitiveTypes.put(byte[].class, new BinaryTypeHelper());
}
private static TypeHelper getTypeHelper(Class<?> forClass) {
TypeHelper typeHelper = primitiveTypes.get(forClass);
if (typeHelper == null && forClass.isArray()) {
typeHelper = new ListTypeHelper();
}
if (typeHelper == null) {
typeHelper = new TupleTypeHelper();
}
return typeHelper;
}
/**
* Converts Java objects arrays to Erlang: 1. single object (if array arity
* == 1) or 2. tuple (if array arity > 1)
*
* @param objects
* @return
*/
public static OtpErlangObject toErlang(Object[] objects) {
OtpErlangObject result = null;
if (objects != null) {
TypeHelper helper = null;
switch (objects.length) {
case 0:
result = new OtpErlangList();
break;
case 1:
helper = getTypeHelper(objects[0].getClass());
result = helper.toErlang(objects[0]);
break;
default:
OtpErlangObject[] erlObjects = new OtpErlangObject[objects.length];
for (int i = 0; i < objects.length; i++) {
helper = getTypeHelper(objects[i].getClass());
erlObjects[i] = helper.toErlang(objects[i]);
}
result = new OtpErlangTuple(erlObjects);
break;
}
}
return result;
}
/**
* Creates Erlang list basing on unknown Java arrays
*
* @param array
* @return
*/
public static OtpErlangList toErlangAsList(Object array) {
OtpErlangList result = null;
if (array != null) {
List<OtpErlangObject> attrsList = new ArrayList<OtpErlangObject>();
int i = 0;
while (true) {
try {
TypeHelper helper = getTypeHelper(Array.get(array, i)
.getClass());
attrsList.add(helper.toErlang(Array.get(array, i)));
i++;
} catch (ArrayIndexOutOfBoundsException e) {
break;
}
}
result = new OtpErlangList(attrsList
.toArray(new OtpErlangObject[attrsList.size()]));
} else {
result = new OtpErlangList();
}
return result;
}
/**
* Converts single Erlang object to Java
*
* @param object
* @param forClass
* @return
* @throws Exception
*/
public static Object toJava(OtpErlangObject object, Class<?> forClass)
throws Exception {
try {
TypeHelper helper = getTypeHelper(forClass);
return helper.toJava(object, forClass);
} catch (ClassCastException e) {
throw new TypeMismatchException(forClass, object.getClass());
}
}
/**
* Creates array of Java objects from Erlang list
*
* @param objects
* @param forClass
* @return
* @throws Exception
*/
public static Object[] toJavaFromList(OtpErlangList objects,
Class<?>[] forClass) throws Exception {
Object[] result = new Object[objects.arity()];
try {
for (int i = 0; i < objects.arity(); i++) {
TypeHelper helper = getTypeHelper(forClass[i]);
result[i] = helper.toJava(objects.elementAt(i), forClass[i]);
}
} catch (Exception e) {
// type mismatch as mismatch of parameters count or parameters type
if (e.getClass().equals(ClassCastException.class)
|| e.getClass()
.equals(ArrayIndexOutOfBoundsException.class))
throw new TypeMismatchException();
}
return result;
}
/**
* Converts incoming Erlang message to operation arguments
*
* @param objects
* @param forClass
* @return
* @throws Exception
*/
public static Object[] toJavaAsArgs(OtpErlangObject objects,
Class<?>[] forClass) throws Exception {
OtpErlangObject[] args = null;
// normalize input
if (objects.getClass().equals(OtpErlangTuple.class)) {
args = new OtpErlangObject[((OtpErlangTuple) objects).arity()];
for (int i = 0; i < ((OtpErlangTuple) objects).arity(); i++) {
args[i] = ((OtpErlangTuple) objects).elementAt(i);
}
} else {
args = new OtpErlangObject[1];
args[0] = objects;
}
Object[] result = new Object[args.length];
try {
for (int i = 0; i < args.length; i++) {
TypeHelper helper = getTypeHelper(forClass[i]);
result[i] = helper.toJava(args[i], forClass[i]);
}
} catch (Exception e) {
// type mismatch as mismatch of parameters count or parameters type
if (e.getClass().equals(ClassCastException.class)
|| e.getClass()
.equals(ArrayIndexOutOfBoundsException.class))
throw new TypeMismatchException();
}
return result;
}
}
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