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org.glassfish.pfl.basic.algorithm.ObjectUtility Maven / Gradle / Ivy
/*
* Copyright (c) 2002, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.glassfish.pfl.basic.algorithm;
import org.glassfish.pfl.basic.contain.Pair;
import org.glassfish.pfl.basic.reflection.FieldValueHelper;
import javax.management.ObjectName;
import javax.management.openmbean.ArrayType;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.TabularData;
import javax.management.openmbean.TabularType;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* General object related utilities.
*/
public final class ObjectUtility {
interface ObjectPrinter {
void print(IdentityHashMap printed, ObjectWriter buff, Object obj);
// Returns true if this printer should ALWAYS print, even if
// the object has been visited before.
boolean alwaysPrint();
}
private static class ClassMap {
List, ObjectPrinter>> data;
public ClassMap() {
data = new ArrayList<>();
}
/**
* Return the first element of the ClassMap that is assignable to cls.
* The order is determined by the order in which the put method was
* called. Returns null if there is no match.
*/
public ObjectPrinter get(Class cls) {
for (Pair, ObjectPrinter> pair : data) {
if (pair.first().isAssignableFrom(cls)) {
return pair.second();
}
}
return null;
}
/**
* Add obj to the map with key cls. Note that order matters,
* as the first match is returned.
*/
public void put(Class cls, ObjectPrinter obj) {
Pair, ObjectPrinter> pair = new Pair, ObjectPrinter>(cls, obj);
data.add(pair);
}
}
private ObjectPrinter generalObjectPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff, java.lang.Object obj) {
handleObject(printed, buff, obj);
}
public boolean alwaysPrint() {
return false;
}
};
private ObjectPrinter arrayPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff, java.lang.Object obj) {
handleArray(printed, buff, obj);
}
public boolean alwaysPrint() {
return false;
}
};
private static ObjectPrinter propertiesPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff, java.lang.Object obj) {
if (!(obj instanceof Properties)) {
throw new Error();
}
Properties props = (Properties) obj;
Enumeration keys = props.propertyNames();
while (keys.hasMoreElements()) {
String key = (String) (keys.nextElement());
String value = props.getProperty(key);
buff.startElement();
buff.append(key);
buff.append("=");
buff.append(value);
buff.endElement();
}
}
public boolean alwaysPrint() {
return true;
}
};
private ObjectPrinter collectionPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff, java.lang.Object obj) {
if (!(obj instanceof Collection)) {
throw new Error();
}
Collection coll = (Collection) obj;
Iterator iter = coll.iterator();
while (iter.hasNext()) {
java.lang.Object element = iter.next();
buff.startElement();
objectToStringHelper(printed, buff, element);
buff.endElement();
}
}
public boolean alwaysPrint() {
return false;
}
};
private ObjectPrinter mapPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff, java.lang.Object obj) {
if (!(obj instanceof Map)) {
throw new Error();
}
Map map = (Map) obj;
Iterator iter = map.entrySet().iterator();
while (iter.hasNext()) {
Entry entry = (Entry) (iter.next());
buff.startElement();
objectToStringHelper(printed, buff, entry.getKey());
buff.append("=>");
objectToStringHelper(printed, buff, entry.getValue());
buff.endElement();
}
}
public boolean alwaysPrint() {
return false;
}
};
private static ObjectPrinter toStringPrinter = new ObjectPrinter() {
public void print(IdentityHashMap printed, ObjectWriter buff,
java.lang.Object obj) {
buff.append(obj.toString());
}
public boolean alwaysPrint() {
return true;
}
};
// Order matters here: subclasses must appear before superclasses!
private final Object[][] CLASS_MAP_DATA = {
{Integer.class, toStringPrinter},
{BigInteger.class, toStringPrinter},
{BigDecimal.class, toStringPrinter},
{String.class, toStringPrinter},
{StringBuffer.class, toStringPrinter},
{StringBuilder.class, toStringPrinter},
{Long.class, toStringPrinter},
{Short.class, toStringPrinter},
{Byte.class, toStringPrinter},
{Character.class, toStringPrinter},
{Float.class, toStringPrinter},
{Double.class, toStringPrinter},
{Boolean.class, toStringPrinter},
{Date.class, toStringPrinter},
{ObjectName.class, toStringPrinter},
{CompositeData.class, toStringPrinter},
{CompositeType.class, toStringPrinter},
{TabularData.class, toStringPrinter},
{TabularType.class, toStringPrinter},
{ArrayType.class, toStringPrinter},
{Class.class, toStringPrinter},
{Method.class, toStringPrinter},
{Thread.class, toStringPrinter},
{AtomicInteger.class, toStringPrinter},
{AtomicLong.class, toStringPrinter},
{AtomicBoolean.class, toStringPrinter},
{Properties.class, propertiesPrinter},
{Collection.class, collectionPrinter},
{Map.class, mapPrinter},
};
private ClassMap classMap;
private boolean isIndenting;
private int initialLevel;
private int increment;
private static ObjectUtility standard = new ObjectUtility(true, 0, 4);
private static ObjectUtility compact = new ObjectUtility(false, 0, 4);
public ObjectUtility(boolean isIndenting, int initialLevel, int increment) {
this.isIndenting = isIndenting;
this.initialLevel = initialLevel;
this.increment = increment;
this.classMap = new ClassMap();
for (Object[] pair : CLASS_MAP_DATA) {
Class key = (Class) pair[0];
ObjectPrinter value = (ObjectPrinter) pair[1];
classMap.put(key, value);
}
}
public ObjectUtility useToString(Class cls) {
classMap.put(cls, toStringPrinter);
return this;
}
/**
* A convenience method that gives the default behavior: use indenting
* to display the object's structure and do not use built-in toString
* methods.
*
* @param object Object to print.
* @return the String representation of obj.
*/
public static String defaultObjectToString(java.lang.Object object) {
return standard.objectToString(object);
}
/**
* A convenience method that gives the default behavior: do not use
* indenting to display the object's structure.
*
* @param object Object to print.
* @return the String representation of obj.
*/
public static String compactObjectToString(java.lang.Object object) {
return compact.objectToString(object);
}
/**
* objectToString handles display of arbitrary objects. It correctly
* handles objects whose elements form an arbitrary graph. It uses
* reflection to display the contents of any kind of object.
* An object's toString() method may optionally be used, but the default
* is to ignore all toString() methods except for those defined for
* primitive types, primitive type wrappers, and strings.
*/
public String objectToString(java.lang.Object obj) {
IdentityHashMap printed = new IdentityHashMap();
ObjectWriter result = ObjectWriter.make(isIndenting, initialLevel, increment);
objectToStringHelper(printed, result, obj);
return result.toString();
}
//===========================================================================
// Implementation
//===========================================================================
ObjectPrinter classify(Class cls) {
if (cls.isEnum()) {
return toStringPrinter;
} else if (cls.isArray()) {
return arrayPrinter;
} else {
ObjectPrinter result = classMap.get(cls);
if (result == null) {
return generalObjectPrinter;
} else {
return result;
}
}
}
@SuppressWarnings("unchecked")
private void objectToStringHelper(IdentityHashMap printed,
ObjectWriter result, java.lang.Object obj) {
if (obj == null) {
result.append("null");
result.endElement();
} else {
Class cls = obj.getClass();
ObjectPrinter opr = classify(cls);
result.startObject(obj);
try {
if (opr.alwaysPrint()) {
opr.print(printed, result, obj);
} else {
if (printed.keySet().contains(obj)) {
result.append("*VISITED*");
} else {
printed.put(obj, null);
opr.print(printed, result, obj);
}
}
} finally {
result.endObject();
}
}
}
// Determine whether or not the package of class cls is
// accessible. Handles arrays as well as normal classes.
private void checkPackageAccess(Class cls) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
String cname = cls.getName().replace('/', '.');
if (cname.startsWith("[")) {
final int lastBracket = cname.lastIndexOf("[") + 2;
if (lastBracket > 1 && lastBracket < cname.length()) {
cname = cname.substring(lastBracket);
}
final int lastDot = cname.lastIndexOf('.');
if (lastDot != -1) {
final String pname = cname.substring(0, lastDot);
sm.checkPackageAccess(pname);
}
}
}
}
private Field[] getDeclaredFields(Class cls) {
checkPackageAccess(cls);
return cls.getDeclaredFields();
}
@SuppressWarnings("unchecked")
private void handleObject(IdentityHashMap printed, ObjectWriter result,
java.lang.Object obj) {
Class cls = obj.getClass();
try {
SecurityManager security = System.getSecurityManager();
List allFields = new ArrayList();
Class current = cls;
while (!current.equals(Object.class)) {
Field[] fields;
// If the security manager is not null, throw a security exception
// if current is NOT accessible from the caller.
if (security != null && !Modifier.isPublic(current.getModifiers())) {
fields = new Field[0];
} else {
fields = getDeclaredFields(current);
}
for (Field fld : fields) {
allFields.add(fld);
}
current = current.getSuperclass();
}
for (final Field fld : allFields) {
int modifiers = fld.getModifiers();
if (fld.isAnnotationPresent(DumpIgnore.class)) {
continue;
}
// Do not display field if it is static, since these fields
// are always the same for every instances. This could
// be made configurable, but I don't think it is
// useful to do so.
if (!Modifier.isStatic(modifiers)) {
if (security != null) {
if (!Modifier.isPublic(modifiers)) {
continue;
}
}
result.startElement();
result.append(fld.getName());
result.append("=");
Object value = FieldValueHelper.getFieldValue(obj, fld);
if (fld.isAnnotationPresent(DumpToString.class)) {
toStringPrinter.print(printed, result, value);
} else {
objectToStringHelper(printed, result, value);
}
result.endElement();
}
}
} catch (IllegalArgumentException | IllegalAccessException ex) {
// Just ignore the exception here
result.append(obj.toString());
}
}
private void handleArray(IdentityHashMap printed, ObjectWriter result,
java.lang.Object obj) {
Class compClass = obj.getClass().getComponentType();
if (compClass == boolean.class) {
boolean[] arr = (boolean[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == byte.class) {
byte[] arr = (byte[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == short.class) {
short[] arr = (short[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == int.class) {
int[] arr = (int[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == long.class) {
long[] arr = (long[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == char.class) {
char[] arr = (char[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == float.class) {
float[] arr = (float[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else if (compClass == double.class) {
double[] arr = (double[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
result.append(arr[ctr]);
result.endElement();
}
} else { // array of object
java.lang.Object[] arr = (java.lang.Object[]) obj;
for (int ctr = 0; ctr < arr.length; ctr++) {
result.startElement();
objectToStringHelper(printed, result, arr[ctr]);
result.endElement();
}
}
}
}
