1 files changed, 378 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-jaxb/src/main/java/org/apache/tuscany/sca/databinding/jaxb/DataConverter.java b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-jaxb/src/main/java/org/apache/tuscany/sca/databinding/jaxb/DataConverter.java
new file mode 100644
index 0000000000..35adffe23b
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/databinding-jaxb/src/main/java/org/apache/tuscany/sca/databinding/jaxb/DataConverter.java
@@ -0,0 +1,378 @@
+/*
+ * 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.databinding.jaxb;
+
+import java.awt.Image;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Hashtable;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import javax.activation.DataHandler;
+import javax.imageio.ImageIO;
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+import org.oasisopen.sca.ServiceRuntimeException;
+
+/**
+ * Provides utilities to convert an object into a different kind of Object. For example, convert a
+ * String[] into a List<String>
+ */
+public class DataConverter {
+
+    /**
+     * This method should return true if the convert method will succeed.
+     * <p/>
+     * Note that any changes to isConvertable() must also be accompanied by similar changes to
+     * convert()
+     *
+     * @param obj  source object or class
+     * @param dest destination class
+     * @return boolean true if convert(..) can convert obj to the destination class
+     */
+    public static boolean isConvertable(Object obj, Class dest) {
+        Class src = null;
+
+        if (obj != null) {
+            if (obj instanceof Class) {
+                src = (Class)obj;
+            } else {
+                src = obj.getClass();
+            }
+        }
+
+        if (dest == null) {
+            return false;
+        }
+
+        if (src == null) {
+            return true;
+        }
+
+        // If we're directly assignable, we're good.
+        if (dest.isAssignableFrom(src)) {
+            return true;
+        }
+
+        // If it's a wrapping conversion, we're good.
+        if (getWrapperClass(src) == dest) {
+            return true;
+        }
+        if (getWrapperClass(dest) == src) {
+            return true;
+        }
+
+        // If it's List -> Array or vice versa, we're good.
+        if ((Collection.class.isAssignableFrom(src) || src.isArray()) && (Collection.class.isAssignableFrom(dest) || dest
+            .isArray())) {
+
+            // TODO this should consider the component types instead of returning true.
+            return true;
+        }
+
+        // Allow mapping of HashMaps to Hashtables
+        if (src == HashMap.class && dest == Hashtable.class)
+            return true;
+
+        // Allow mapping of Calendar to Date
+        if (Calendar.class.isAssignableFrom(src) && dest == Date.class) {
+            return true;
+        }
+
+        if (src.isPrimitive()) {
+            return isConvertable(getWrapperClass(src), dest);
+        }
+
+        if (InputStream.class.isAssignableFrom(src) && dest == byte[].class) {
+            return true;
+        }
+
+        if (Source.class.isAssignableFrom(src) && dest == byte[].class) {
+            return true;
+        }
+
+        if (DataHandler.class.isAssignableFrom(src) && isConvertable(byte[].class, dest)) {
+            return true;
+        }
+
+        if (DataHandler.class.isAssignableFrom(src) && dest == Image.class) {
+            return true;
+        }
+
+        if (DataHandler.class.isAssignableFrom(src) && dest == Source.class) {
+            return true;
+        }
+
+        if (byte[].class.isAssignableFrom(src) && dest == String.class) {
+            return true;
+        }
+
+        // If it's a MIME type mapping and we want a DataHandler,
+        // then we're good.
+        // REVIEW Do we want to support this
+        /*
+        if (dest.getName().equals("javax.activation.DataHandler")) {
+            String name = src.getName();
+            if (src == String.class
+                    || src == java.awt.Image.class
+                    || name.equals("javax.mail.internet.MimeMultipart")
+                    || name.equals("javax.xml.transform.Source"))
+                return true;
+        }
+        */
+
+        return false;
+    }
+
+    /**
+     * Utility function to convert an Object to some desired Class.
+     * <p/>
+     * Normally this is used for T[] to List<T> processing. Other conversions are also done (i.e.
+     * HashMap <->Hashtable, etc.)
+     * <p/>
+     * Use the isConvertable() method to determine if conversion is possible. Note that any changes
+     * to convert() must also be accompanied by similar changes to isConvertable()
+     *
+     * @param arg       the array to convert
+     * @param destClass the actual class we want
+     * @return object of destClass if conversion possible, otherwise returns arg
+     */
+    public static Object convert(Object arg, Class<?> destClass) {
+        if (destClass == null) {
+            return arg;
+        }
+
+        if (arg != null && destClass.isAssignableFrom(arg.getClass())) {
+            return arg;
+        }
+
+        // Convert between Calendar and Date
+        if (arg instanceof Calendar && destClass == Date.class) {
+            return ((Calendar)arg).getTime();
+        }
+
+        // Convert between HashMap and Hashtable
+        if (arg instanceof HashMap && destClass == Hashtable.class) {
+            return new Hashtable((HashMap)arg);
+        }
+
+        if (arg instanceof InputStream && destClass == byte[].class) {
+
+            try {
+                InputStream is = (InputStream)arg;
+                return getBytesFromStream(is);
+            } catch (IOException e) {
+                throw new ServiceRuntimeException(e);
+            }
+        }
+
+        if (arg instanceof Source && destClass == byte[].class) {
+            try {
+                if (arg instanceof StreamSource) {
+                    InputStream is = ((StreamSource)arg).getInputStream();
+                    if (is != null) {
+                        return getBytesFromStream(is);
+                    }
+                }
+                ByteArrayOutputStream out = new ByteArrayOutputStream();
+                Result result = new StreamResult(out);
+                Transformer transformer = TransformerFactory.newInstance().newTransformer();
+                transformer.transform((Source)arg, result);
+                byte[] bytes = out.toByteArray();
+                return bytes;
+
+            } catch (Exception e) {
+                throw new ServiceRuntimeException(e);
+            }
+        }
+
+        if (arg instanceof DataHandler) {
+            try {
+                InputStream is = ((DataHandler)arg).getInputStream();
+                if (destClass == Image.class) {
+                    return ImageIO.read(is);
+                } else if (destClass == Source.class) {
+                    return new StreamSource(is);
+                }
+                byte[] bytes = getBytesFromStream(is);
+                return convert(bytes, destClass);
+            } catch (Exception e) {
+                throw new ServiceRuntimeException(e);
+            }
+        }
+
+        if (arg instanceof byte[] && destClass == String.class) {
+            return new String((byte[])arg);
+        }
+
+        // If the destination is an array and the source
+        // is a suitable component, return an array with 
+        // the single item.
+        /* REVIEW do we need to support atomic to array conversion ?
+        if (arg != null &&
+            destClass.isArray() &&
+            !destClass.getComponentType().equals(Object.class) &&
+            destClass.getComponentType().isAssignableFrom(arg.getClass())) {
+            Object array = 
+                Array.newInstance(destClass.getComponentType(), 1);
+            Array.set(array, 0, arg);
+            return array;
+        }
+        */
+
+        // Return if no conversion is available
+        if (!(arg instanceof Collection || (arg != null && arg.getClass().isArray()))) {
+            return arg;
+        }
+
+        if (arg == null) {
+            return null;
+        }
+
+        // The arg may be an array or List 
+        Object destValue = null;
+        int length = 0;
+        if (arg.getClass().isArray()) {
+            length = Array.getLength(arg);
+        } else {
+            length = ((Collection)arg).size();
+        }
+
+        try {
+            if (destClass.isArray()) {
+                if (destClass.getComponentType().isPrimitive()) {
+
+                    Object array = Array.newInstance(destClass.getComponentType(), length);
+                    // Assign array elements
+                    if (arg.getClass().isArray()) {
+                        for (int i = 0; i < length; i++) {
+                            Array.set(array, i, Array.get(arg, i));
+                        }
+                    } else {
+                        int idx = 0;
+                        for (Iterator i = ((Collection)arg).iterator(); i.hasNext();) {
+                            Array.set(array, idx++, i.next());
+                        }
+                    }
+                    destValue = array;
+
+                } else {
+                    Object[] array;
+                    try {
+                        array = (Object[])Array.newInstance(destClass.getComponentType(), length);
+                    } catch (Exception e) {
+                        return arg;
+                    }
+
+                    // Use convert to assign array elements.
+                    if (arg.getClass().isArray()) {
+                        for (int i = 0; i < length; i++) {
+                            array[i] = convert(Array.get(arg, i), destClass.getComponentType());
+                        }
+                    } else {
+                        int idx = 0;
+                        for (Iterator i = ((Collection)arg).iterator(); i.hasNext();) {
+                            array[idx++] = convert(i.next(), destClass.getComponentType());
+                        }
+                    }
+                    destValue = array;
+                }
+            } else if (Collection.class.isAssignableFrom(destClass)) {
+                Collection newList = null;
+                try {
+                    // if we are trying to create an interface, build something
+                    // that implements the interface
+                    if (destClass == Collection.class || destClass == List.class) {
+                        newList = new ArrayList();
+                    } else if (destClass == Set.class) {
+                        newList = new HashSet();
+                    } else {
+                        newList = (Collection)destClass.newInstance();
+                    }
+                } catch (Exception e) {
+                    // No FFDC code needed
+                    // Couldn't build one for some reason... so forget it.
+                    return arg;
+                }
+
+                if (arg.getClass().isArray()) {
+                    for (int j = 0; j < length; j++) {
+                        newList.add(Array.get(arg, j));
+                    }
+                } else {
+                    for (Iterator j = ((Collection)arg).iterator(); j.hasNext();) {
+                        newList.add(j.next());
+                    }
+                }
+                destValue = newList;
+            } else {
+                destValue = arg;
+            }
+        } catch (Throwable t) {
+            throw new ServiceRuntimeException(t);
+        }
+
+        return destValue;
+    }
+
+    private static byte[] getBytesFromStream(InputStream is) throws IOException {
+        // TODO This code assumes that available is the length of the stream.
+        byte[] bytes = new byte[is.available()];
+        is.read(bytes);
+        return bytes;
+    }
+
+    public static Class getWrapperClass(Class primitive) {
+        if (primitive == int.class) {
+            return java.lang.Integer.class;
+        } else if (primitive == short.class) {
+            return java.lang.Short.class;
+        } else if (primitive == boolean.class) {
+            return java.lang.Boolean.class;
+        } else if (primitive == byte.class) {
+            return java.lang.Byte.class;
+        } else if (primitive == long.class) {
+            return java.lang.Long.class;
+        } else if (primitive == double.class) {
+            return java.lang.Double.class;
+        } else if (primitive == float.class) {
+            return java.lang.Float.class;
+        } else if (primitive == char.class) {
+            return java.lang.Character.class;
+        }
+
+        return null;
+    }
+}