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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.assembly.builder.impl;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.w3c.dom.Node;
/**
* A simple print utility class to help print model instances.
*
* @version $Rev$ $Date$
*/
class PrintUtil {
private boolean useGetters = false;
private PrintWriter out;
private int indent;
public PrintUtil(PrintWriter out, boolean useGetters) {
this.out = out;
this.useGetters = useGetters;
}
public PrintUtil(OutputStream out) {
this.out = new PrintWriter(new OutputStreamWriter(out), true);
}
void indent() {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
}
/**
* Print an object.
*
* @param object
*/
public void print(Object object) {
Set<Integer> objects = new HashSet<Integer>();
print(object, objects);
}
/**
* Print an object.
*
* @param object
*/
private void print(Object object, Set<Integer> printed) {
if (object == null) {
return;
}
int id = System.identityHashCode(object);
if (printed.contains(id)) {
// If we've already printed an object, print just it's HashCode
indent();
out.println(object.getClass().getName() + "@" + id);
} else {
printed.add(id);
try {
// Print the object class name
indent();
out.println(object.getClass().getSimpleName() + " {");
// Get the object's properties
ValueAccessor accessor = useGetters ? new PropertyAccessor(object) : new FieldAccessor(object);
for (int i = 0; i < accessor.size(); i++) {
try {
// Get the value of each property
Object value = accessor.getValue(i);
if (value != null) {
// Convert array value into a list
if (value.getClass().isArray()) {
value = Arrays.asList((Object[])value);
}
// Print elements in a list
if (value instanceof List) {
if (!((List<?>)value).isEmpty()) {
indent++;
indent();
out.println(accessor.getName(i) + "= [");
// Print each element, recursively
for (Object element : (List<?>)value) {
indent++;
print(element, printed);
indent--;
}
indent();
out.println(" ]");
indent--;
}
} else {
Class<?> valueClass = value.getClass();
// Print a primitive, java built in type or
// enum, using toString()
if (valueClass.isPrimitive() || valueClass.getName().startsWith("java.")
|| valueClass.getName().startsWith("javax.")
|| valueClass.isEnum()) {
if (!accessor.getName(i).equals("class")) {
if (!(Boolean.FALSE.equals(value))) {
indent++;
indent();
out.println(accessor.getName(i) + "=" + value.toString());
indent--;
}
}
} else if (value instanceof Node) {
indent++;
indent();
out.println(accessor.getName(i) + "=" + value.toString());
indent--;
} else {
// Print an object, recursively
indent++;
indent();
out.println(accessor.getName(i) + "= {");
indent++;
print(value, printed);
indent--;
indent();
out.println("}");
indent--;
}
}
}
} catch (Exception e) {
}
}
indent();
out.println("}");
} catch (Exception e) {
indent();
out.println(e);
}
}
}
public static interface ValueAccessor {
int size();
String getName(int i);
Object getValue(int i) throws Exception;
}
/**
* Java field reflection based value accessor
*/
private static class FieldAccessor implements ValueAccessor {
private Object object;
private List<Field> fields;
public FieldAccessor(Object object) {
this.fields = getAllFields(object.getClass());
this.object = object;
}
public String getName(int i) {
return fields.get(i).getName();
}
public Object getValue(int i) throws Exception {
return fields.get(i).get(object);
}
public int size() {
return fields.size();
}
}
/**
* JavaBean-based value accessor
*/
private static class PropertyAccessor implements ValueAccessor {
private Object object;
private PropertyDescriptor[] fields;
public PropertyAccessor(Object object) throws IntrospectionException {
BeanInfo beanInfo = Introspector.getBeanInfo(object.getClass());
this.fields = beanInfo.getPropertyDescriptors();
this.object = object;
}
public String getName(int i) {
return fields[i].getName();
}
public Object getValue(int i) throws Exception {
Method getter = fields[i].getReadMethod();
if (getter != null) {
return getter.invoke(object);
}
return null;
}
public int size() {
return fields.length;
}
}
/**
* Returns a collection of fields declared by a class
* or one of its supertypes
*/
private static List<Field> getAllFields(Class<?> clazz) {
return getAllFields(clazz, new ArrayList<Field>());
}
/**
* Recursively evaluates the type hierarchy to return all fields
*/
private static List<Field> getAllFields(Class<?> clazz, List<Field> fields) {
if (clazz == null || clazz.isArray() || Object.class.equals(clazz)) {
return fields;
}
fields = getAllFields(clazz.getSuperclass(), fields);
Field[] declaredFields = clazz.getDeclaredFields();
for (final Field field : declaredFields) {
AccessController.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
field.setAccessible(true); // ignore Java accessibility
return null;
}
});
fields.add(field);
}
return fields;
}
}
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