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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.core.loader;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import javax.xml.stream.XMLStreamException;
import org.apache.tuscany.spi.ObjectFactory;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.loader.PropertyObjectFactory;
import org.apache.tuscany.spi.model.Property;
import org.apache.tuscany.spi.model.PropertyValue;
import org.apache.tuscany.core.injection.SingletonObjectFactory;
/**
* Implementation of StAXPropertyFactory that interprets the XML as
*
* @version $Rev$ $Date$
*/
public class StringParserPropertyFactory implements PropertyObjectFactory {
public <T> ObjectFactory<T> createObjectFactory(Property<T> property, PropertyValue<T> value)
throws LoaderException {
String text = value.getValue().getDocumentElement().getTextContent();
return new SingletonObjectFactory<T>(createInstance(text, property.getJavaType()));
}
@SuppressWarnings("unchecked")
public <T> T createInstance(String text, Class<T> type) throws LoaderException {
// Class<T> type = property.getJavaType();
assert type != null : "property type is null";
// degenerate case where property type is a String
if (String.class.equals(type)) {
return type.cast(text);
}
// special handler to convert hexBinary to a byte[]
if (byte[].class.equals(type)) {
byte[] instance = new byte[text.length() >> 1];
for (int i = 0; i < instance.length; i++) {
instance[i] =
(byte) (Character.digit(text.charAt(i << 1), 16) << 4 | Character.digit(text
.charAt((i << 1) + 1), 16));
}
return type.cast(instance);
}
// does this type have a static valueOf(String) method?
try {
Method valueOf = type.getMethod("valueOf", String.class);
if (Modifier.isStatic(valueOf.getModifiers())) {
try {
return type.cast(valueOf.invoke(null, text));
} catch (IllegalAccessException e) {
throw new AssertionError("getMethod returned an inaccessible method");
} catch (InvocationTargetException e) {
// FIXME we should throw something better
throw new LoaderException(e.getCause());
}
}
} catch (NoSuchMethodException e) {
// try something else
}
// does this type have a constructor that takes a String?
try {
Constructor<T> ctr = type.getConstructor(String.class);
return ctr.newInstance(text);
} catch (NoSuchMethodException e) {
// try something else
} catch (IllegalAccessException e) {
throw new AssertionError("getConstructor returned an inaccessible method");
} catch (InstantiationException e) {
throw new LoaderException("Property type cannot be instantiated: " + type.getName());
} catch (InvocationTargetException e) {
// FIXME we should throw something better
throw new LoaderException(e.getCause());
}
// do we have a property editor for it?
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor != null) {
try {
editor.setAsText(text);
return (T) editor.getValue();
} catch (IllegalArgumentException e) {
// FIXME we should throw something better
throw new LoaderException(e);
}
}
// FIXME we should throw something better
throw new LoaderException("Do not have a way to parse a String into a " + type.getName());
}
@SuppressWarnings("unchecked")
public <T> ObjectFactory<T> createObjectFactory(String text, Property<T> property)
throws XMLStreamException, LoaderException {
Class<T> type = property.getJavaType();
assert type != null : "property type is null";
// degenerate case where property type is a String
if (String.class.equals(type)) {
return new SingletonObjectFactory<T>(type.cast(text));
}
// special handler to convert hexBinary to a byte[]
if (byte[].class.equals(type)) {
byte[] instance = new byte[text.length() >> 1];
for (int i = 0; i < instance.length; i++) {
instance[i] =
(byte) (Character.digit(text.charAt(i << 1), 16) << 4 | Character.digit(text
.charAt((i << 1) + 1), 16));
}
return new SingletonObjectFactory<T>(type.cast(instance));
}
// does this type have a static valueOf(String) method?
try {
Method valueOf = type.getMethod("valueOf", String.class);
if (Modifier.isStatic(valueOf.getModifiers())) {
try {
return new SingletonObjectFactory<T>(type.cast(valueOf.invoke(null, text)));
} catch (IllegalAccessException e) {
throw new AssertionError("getMethod returned an inaccessible method");
} catch (InvocationTargetException e) {
// FIXME we should throw something better
throw new LoaderException(e.getCause());
}
}
} catch (NoSuchMethodException e) {
// try something else
}
// does this type have a constructor that takes a String?
try {
Constructor<T> ctr = type.getConstructor(String.class);
return new SingletonObjectFactory<T>(ctr.newInstance(text));
} catch (NoSuchMethodException e) {
// try something else
} catch (IllegalAccessException e) {
throw new AssertionError("getConstructor returned an inaccessible method");
} catch (InstantiationException e) {
throw new LoaderException("Property type cannot be instantiated: " + type.getName());
} catch (InvocationTargetException e) {
// FIXME we should throw something better
throw new LoaderException(e.getCause());
}
// do we have a property editor for it?
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor != null) {
try {
editor.setAsText(text);
return new SingletonObjectFactory<T>((T) editor.getValue());
} catch (IllegalArgumentException e) {
// FIXME we should throw something better
throw new LoaderException(e);
}
}
// FIXME we should throw something better
throw new LoaderException("Do not have a way to parse a String into a " + type.getName());
}
}
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