300 lines
11 KiB
Java
300 lines
11 KiB
Java
/*
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Array;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.IdentityHashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Queue;
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import java.util.SortedMap;
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import java.util.SortedSet;
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final class BeanValidator {
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private final Map<Object, Object> cache = new IdentityHashMap<Object, Object>();
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public void validate(Object object1, Object object2) {
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// compare references
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if (object1 == object2) {
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return;
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}
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// check for null
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if ((object1 == null) || (object2 == null)) {
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throw new IllegalStateException("could not compare object with null");
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}
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// resolve self references
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if (isCyclic(object1, object2)) {
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return;
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}
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// resolve cross references
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if (isCyclic(object2, object1)) {
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return;
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}
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Class type = object1.getClass();
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if (!type.equals(object2.getClass())) {
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// resolve different implementations of the Map.Entry interface
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if ((object1 instanceof Map.Entry) && (object2 instanceof Map.Entry)) {
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log("!!! special case", "Map.Entry");
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Map.Entry entry1 = (Map.Entry) object1;
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Map.Entry entry2 = (Map.Entry) object2;
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validate(entry1.getKey(), entry2.getKey());
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validate(entry1.getValue(), entry2.getValue());
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return;
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}
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throw new IllegalStateException("could not compare objects with different types");
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}
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// validate elements of arrays
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if (type.isArray()) {
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int length = Array.getLength(object1);
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if (length != Array.getLength(object2)) {
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throw new IllegalStateException("could not compare arrays with different lengths");
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}
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try {
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this.cache.put(object1, object2);
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for (int i = 0; i < length; i++) {
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log("validate array element", Integer.valueOf(i));
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validate(Array.get(object1, i), Array.get(object2, i));
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}
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} finally {
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this.cache.remove(object1);
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}
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return;
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}
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// special case for collections: do not use equals
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boolean ignore = Collection.class.isAssignableFrom(type)
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|| Map.Entry.class.isAssignableFrom(type)
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|| Map.class.isAssignableFrom(type);
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// validate objects using equals()
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// we assume that the method equals(Object) can be called,
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// if the class declares such method
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if (!ignore && isDefined(type, "equals", Object.class)) {
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if (object1.equals(object2)) {
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return;
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}
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throw new IllegalStateException("the first object is not equal to the second one");
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}
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// validate comparable objects using compareTo()
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// we assume that the method compareTo(Object) can be called,
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// if the class declares such method and implements interface Comparable
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if (Comparable.class.isAssignableFrom(type) && isDefined(type, "compareTo", Object.class)) {
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Comparable cmp = (Comparable) object1;
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if (0 == cmp.compareTo(object2)) {
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return;
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}
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throw new IllegalStateException("the first comparable object is not equal to the second one");
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}
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try {
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this.cache.put(object1, object2);
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// validate values of public fields
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for (Field field : getFields(type)) {
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int mod = field.getModifiers();
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if (!Modifier.isStatic(mod)) {
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log("validate field", field.getName());
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validate(object1, object2, field);
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}
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}
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// validate values of properties
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for (PropertyDescriptor pd : getDescriptors(type)) {
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Method method = pd.getReadMethod();
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if (method != null) {
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log("validate property", pd.getName());
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validate(object1, object2, method);
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}
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}
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// validate contents of maps
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if (SortedMap.class.isAssignableFrom(type)) {
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validate((Map) object1, (Map) object2, true);
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} else if (Map.class.isAssignableFrom(type)) {
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validate((Map) object1, (Map) object2, false);
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}
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// validate contents of collections
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if (SortedSet.class.isAssignableFrom(type)) {
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validate((Collection) object1, (Collection) object2, true);
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} else if (List.class.isAssignableFrom(type)) {
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validate((Collection) object1, (Collection) object2, true);
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} else if (Queue.class.isAssignableFrom(type)) {
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validate((Collection) object1, (Collection) object2, true);
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} else if (Collection.class.isAssignableFrom(type)) {
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validate((Collection) object1, (Collection) object2, false);
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}
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} finally {
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this.cache.remove(object1);
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}
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}
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private void validate(Object object1, Object object2, Field field) {
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try {
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object1 = field.get(object1);
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object2 = field.get(object2);
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validate(object1, object2);
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}
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catch (IllegalAccessException exception) {
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log(exception);
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}
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}
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private void validate(Object object1, Object object2, Method method) {
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try {
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object1 = method.invoke(object1);
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object2 = method.invoke(object2);
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validate(object1, object2);
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}
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catch (IllegalAccessException exception) {
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log(exception);
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}
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catch (InvocationTargetException exception) {
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log(exception.getCause());
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}
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}
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private void validate(Collection c1, Collection c2, boolean sorted) {
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if (c1.size() != c2.size()) {
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throw new IllegalStateException("could not compare collections with different sizes");
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}
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if (sorted) {
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Iterator first = c1.iterator();
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Iterator second = c2.iterator();
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for (int i = 0; first.hasNext() && second.hasNext(); i++) {
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log("validate collection element", Integer.valueOf(i));
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validate(first.next(), second.next());
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}
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if (first.hasNext() || second.hasNext()) {
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throw new IllegalStateException("one collection contains more elements than another one");
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}
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} else {
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List list = new ArrayList(c2);
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Iterator first = c1.iterator();
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for (int i = 0; first.hasNext(); i++) {
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Object value = first.next();
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log("validate collection element", Integer.valueOf(i));
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Iterator second = list.iterator();
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for (int j = 0; second.hasNext(); j++) {
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log("validate collection element against", Integer.valueOf(j));
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try {
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validate(value, second.next());
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second.remove();
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break;
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} catch (IllegalStateException exception) {
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if (!second.hasNext()) {
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throw new IllegalStateException("one collection does not contain some elements from another one", exception);
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}
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}
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}
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}
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}
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}
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private void validate(Map map1, Map map2, boolean sorted) {
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validate(map1.entrySet(), map2.entrySet(), sorted);
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}
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private boolean isCyclic(Object object1, Object object2) {
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Object object = this.cache.get(object1);
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if (object == null) {
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return false;
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}
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if (object == object2) {
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return true;
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}
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throw new IllegalStateException("could not resolve cyclic reference");
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}
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private boolean isDefined(Class type, String name, Class... params) {
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try {
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return type.equals(type.getMethod(name, params).getDeclaringClass());
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}
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catch (NoSuchMethodException exception) {
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log(exception);
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}
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catch (SecurityException exception) {
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log(exception);
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}
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return false;
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}
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private static final Field[] FIELDS = {};
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private Field[] getFields(Class type) {
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try {
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return type.getFields();
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}
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catch (SecurityException exception) {
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log(exception);
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}
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return FIELDS;
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}
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private static final PropertyDescriptor[] DESCRIPTORS = {};
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private PropertyDescriptor[] getDescriptors(Class type) {
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try {
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return Introspector.getBeanInfo(type, Object.class).getPropertyDescriptors();
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}
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catch (IntrospectionException exception) {
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log(exception);
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}
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return DESCRIPTORS;
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}
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private final StringBuilder sb = new StringBuilder(1024);
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private void log(String message, Object value) {
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this.sb.setLength(0);
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int size = this.cache.size();
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while (0 < size--) {
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this.sb.append(" ");
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}
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this.sb.append(" - ");
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this.sb.append(message);
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if (value != null) {
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this.sb.append(": ");
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this.sb.append(value);
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}
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System.out.println(this.sb.toString());
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}
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private void log(Throwable throwable) {
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this.sb.setLength(0);
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int size = this.cache.size();
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while (0 < size--) {
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this.sb.append(" ");
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}
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this.sb.append(" ? ");
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this.sb.append(throwable);
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System.out.println(this.sb.toString());
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}
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}
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