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/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2021, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------
SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.
You may elect to redistribute this code under any of these licenses.
The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html
The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/
========================================================================
*/
package us.fatehi.utility;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import us.fatehi.utility.string.StringFormat;
public final class ObjectToString {
private static final Logger LOGGER = Logger.getLogger(ObjectToString.class.getName());
public static String toString(final Object object) {
if (object == null) {
return "null";
}
final int indent = 0;
final StringBuilder buffer = new StringBuilder(1024);
appendObject(object, indent, buffer);
return buffer.toString();
}
private static void appendFields(
final Object object, final int indent, final StringBuilder buffer) {
if (object == null) {
return;
}
for (final Field field : getFields(object)) {
try {
final String fieldName = field.getName();
Object fieldValue = field.get(object);
final Class fieldType = field.getType();
if (fieldValue != null) {
if (fieldType.isArray()) {
fieldValue = Arrays.toString((Object[]) fieldValue);
}
}
buffer.append(indent(indent)).append(" ").append(fieldName).append(": ");
if (fieldType.isPrimitive()
|| fieldType.isEnum()
|| fieldValue instanceof String
|| fieldValue == null
|| definesToString(fieldValue)) {
buffer.append(fieldValue);
} else {
appendObject(fieldValue, indent + 1, buffer);
}
buffer.append(System.lineSeparator());
} catch (final Exception e) {
LOGGER.log(Level.FINER, e, new StringFormat("Could not access field <%s>", field));
}
}
}
private static void appendFooter(final int indent, final StringBuilder buffer) {
buffer.append(indent(indent)).append(']');
}
private static void appendHeader(
final Object object, final int indent, final StringBuilder buffer) {
if (object != null) {
buffer
.append(indent(indent))
.append(object.getClass().getName())
.append('@')
.append(Integer.toHexString(System.identityHashCode(object)))
.append('[')
.append(System.lineSeparator());
}
}
private static void appendIterable(
final Iterator iterator, final String delimiter, final StringBuilder buffer) {
while (iterator.hasNext()) {
final Object item = iterator.next();
buffer.append(item);
if (iterator.hasNext()) {
buffer.append(delimiter);
}
}
}
private static void appendObject(
final Object object, final int indent, final StringBuilder buffer) {
final Class objectClass = object.getClass();
if (Map.class.isAssignableFrom(objectClass)) {
final Set> mapEntries = new TreeMap((Map) object).entrySet();
for (final Map.Entry mapEntry : mapEntries) {
final Object key = mapEntry.getKey();
final Object value;
if (key != null && String.valueOf(key).equals("password")) {
value = "*****";
} else {
value = mapEntry.getValue();
}
buffer
.append(System.lineSeparator())
.append(indent(indent))
.append(key)
.append(": ")
.append(value);
}
} else if (Collection.class.isAssignableFrom(objectClass)) {
appendIterable(((Collection) object).iterator(), ", ", buffer);
} else if (objectClass.isArray()) {
appendIterable(Arrays.asList((Object[]) object).iterator(), ", ", buffer);
} else if (objectClass.isEnum()) {
buffer.append(object.toString());
} else if (Arrays.asList(
Integer.class,
Long.class,
Double.class,
Float.class,
Boolean.class,
Character.class,
Byte.class,
Void.class,
Short.class,
String.class)
.contains(objectClass)) {
buffer.append(object.toString());
} else {
appendHeader(object, 0, buffer);
appendFields(object, indent, buffer);
appendFooter(indent, buffer);
}
}
private static boolean definesToString(final Object object) {
boolean definesToString = false;
final Class[] classes = getClassHierarchy(object);
if (classes.length > 0) {
for (final Class clazz : classes) {
try {
definesToString = clazz.getDeclaredMethod("toString") != null;
if (definesToString) {
break;
}
} catch (final SecurityException | NoSuchMethodException e) {
// continue
}
}
}
return definesToString;
}
private static Class[] getClassHierarchy(final Object object) {
final List> classHierarchy = new ArrayList<>();
if (object != null) {
Class clazz = object.getClass();
classHierarchy.add(clazz);
while (clazz.getSuperclass() != null) {
clazz = clazz.getSuperclass();
if (clazz.getSuperclass() != null) {
classHierarchy.add(clazz);
}
}
}
return classHierarchy.toArray(new Class[classHierarchy.size()]);
}
private static Field[] getFields(final Object object) {
final Class[] classes = getClassHierarchy(object);
final List allFields = new ArrayList<>();
if (classes != null && classes.length > 0) {
for (final Class clazz : classes) {
if (clazz.isArray()
|| clazz.isPrimitive()
|| clazz.isEnum()
|| String.class.isAssignableFrom(clazz)) {
break;
}
final Field[] fields = clazz.getDeclaredFields();
AccessibleObject.setAccessible(fields, true);
allFields.addAll(Arrays.asList(fields));
}
}
// Remove static and transient fields
for (final Iterator iterator = allFields.iterator(); iterator.hasNext(); ) {
final Field field = iterator.next();
final int modifiers = field.getModifiers();
if (Modifier.isTransient(modifiers)
|| Modifier.isStatic(modifiers)
|| Modifier.isVolatile(modifiers)) {
iterator.remove();
}
}
// Sort fields
Collections.sort(allFields, (field1, field2) -> field1.getName().compareTo(field2.getName()));
return allFields.toArray(new Field[allFields.size()]);
}
private static char[] indent(final int indent) {
if (indent >= 0) {
final char[] indentChars = new char[indent * 2];
Arrays.fill(indentChars, ' ');
return indentChars;
} else {
return new char[0];
}
}
private ObjectToString() {}
}
