sf.util.ObjectToString Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of schemacrawler Show documentation
Show all versions of schemacrawler Show documentation
SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.
/*
*
* SchemaCrawler
* http://sourceforge.net/projects/schemacrawler
* Copyright (c) 2000-2014, Sualeh Fatehi.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
package sf.util;
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.Comparator;
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;
public final class ObjectToString
{
public static String toString(final Object object)
{
if (object == null)
{
return "null";
}
final int indent = 0;
final StringBuilder buffer = new StringBuilder();
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(Utility.NEWLINE);
}
catch (final Exception e)
{
LOGGER.log(Level.FINER, "Could not access field, " + field, e);
}
}
}
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(Utility.NEWLINE);
}
}
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)
{
buffer.append(Utility.NEWLINE).append(indent(indent))
.append(mapEntry.getKey()).append(": ").append(mapEntry.getValue());
}
}
else if (Collection.class.isAssignableFrom(objectClass))
{
for (final Iterator iterator = ((Collection) object).iterator(); iterator
.hasNext();)
{
final Object item = iterator.next();
buffer.append(item);
if (iterator.hasNext())
{
buffer.append(", ");
}
}
}
else if (objectClass.isArray())
{
for (final Iterator iterator = Arrays.asList((Object[]) object)
.iterator(); iterator.hasNext();)
{
final Object item = iterator.next();
buffer.append(item);
if (iterator.hasNext())
{
buffer.append(", ");
}
}
}
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, new Comparator()
{
@Override
public int compare(final Field field1, final Field field2)
{
return 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 static final Logger LOGGER = Logger.getLogger(ObjectToString.class
.getName());
private ObjectToString()
{
}
}