com.feilong.lib.lang3.builder.EqualsBuilder Maven / Gradle / Ivy
Show all versions of feilong Show documentation
/*
* 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 com.feilong.lib.lang3.builder;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import com.feilong.lib.lang3.ArrayUtils;
import com.feilong.lib.lang3.ClassUtils;
import com.feilong.lib.lang3.tuple.Pair;
/**
*
* Assists in implementing {@link Object#equals(Object)} methods.
*
*
*
* This class provides methods to build a good equals method for any
* class. It follows rules laid out in
* Effective Java
* , by Joshua Bloch. In particular the rule for comparing {@code doubles},
* {@code floats}, and arrays can be tricky. Also, making sure that
* {@code equals()} and {@code hashCode()} are consistent can be
* difficult.
*
*
*
* Two Objects that compare as equals must generate the same hash code,
* but two Objects with the same hash code do not have to be equal.
*
*
*
* All relevant fields should be included in the calculation of equals.
* Derived fields may be ignored. In particular, any field used in
* generating a hash code must be used in the equals method, and vice
* versa.
*
*
*
* Typical use for the code is as follows:
*
*
*
*
* public boolean equals(Object obj){
* if (obj == null){
* return false;
* }
* if (obj == this){
* return true;
* }
* if (obj.getClass() != getClass()){
* return false;
* }
* MyClass rhs = (MyClass) obj;
* return new EqualsBuilder().appendSuper(super.equals(obj)).append(field1, rhs.field1).append(field2, rhs.field2)
* .append(field3, rhs.field3).isEquals();
* }
*
*
*
* Alternatively, there is a method that uses reflection to determine
* the fields to test. Because these fields are usually private, the method,
* {@code reflectionEquals}, uses {@code AccessibleObject.setAccessible} to
* change the visibility of the fields. This will fail under a security
* manager, unless the appropriate permissions are set up correctly. It is
* also slower than testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* A typical invocation for this method would look like:
*
*
*
*
* public boolean equals(Object obj){
* return EqualsBuilder.reflectionEquals(this, obj);
* }
*
*
*
* The {@link EqualsExclude} annotation can be used to exclude fields from being
* used by the {@code reflectionEquals} methods.
*
*
* @since 1.0
*/
public class EqualsBuilder implements Builder{
/**
*
* A registry of objects used by reflection methods to detect cyclical object references and avoid infinite loops.
*
*
* @since 3.0
*/
private static final ThreadLocal>> REGISTRY = new ThreadLocal<>();
/*
* NOTE: we cannot store the actual objects in a HashSet, as that would use the very hashCode()
* we are in the process of calculating.
*
* So we generate a one-to-one mapping from the original object to a new object.
*
* Now HashSet uses equals() to determine if two elements with the same hash code really
* are equal, so we also need to ensure that the replacement objects are only equal
* if the original objects are identical.
*
* The original implementation (2.4 and before) used the System.identityHashCode()
* method - however this is not guaranteed to generate unique ids (e.g. LANG-459)
*
* We now use the IDKey helper class (adapted from org.apache.axis.utils.IDKey)
* to disambiguate the duplicate ids.
*/
/**
*
* Returns the registry of object pairs being traversed by the reflection
* methods in the current thread.
*
*
* @return Set the registry of objects being traversed
* @since 3.0
*/
static Set> getRegistry(){
return REGISTRY.get();
}
/**
*
* Converters value pair into a register pair.
*
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
*
* @return the pair
*/
static Pair getRegisterPair(final Object lhs,final Object rhs){
final IDKey left = new IDKey(lhs);
final IDKey right = new IDKey(rhs);
return Pair.of(left, right);
}
/**
*
* Returns {@code true} if the registry contains the given object pair.
* Used by the reflection methods to avoid infinite loops.
* Objects might be swapped therefore a check is needed if the object pair
* is registered in given or swapped order.
*
*
* @param lhs
* {@code this} object to lookup in registry
* @param rhs
* the other object to lookup on registry
* @return boolean {@code true} if the registry contains the given object.
* @since 3.0
*/
static boolean isRegistered(final Object lhs,final Object rhs){
final Set> registry = getRegistry();
final Pair pair = getRegisterPair(lhs, rhs);
final Pair swappedPair = Pair.of(pair.getRight(), pair.getLeft());
return registry != null && (registry.contains(pair) || registry.contains(swappedPair));
}
/**
*
* Registers the given object pair.
* Used by the reflection methods to avoid infinite loops.
*
*
* @param lhs
* {@code this} object to register
* @param rhs
* the other object to register
*/
private static void register(final Object lhs,final Object rhs){
Set> registry = getRegistry();
if (registry == null){
registry = new HashSet<>();
REGISTRY.set(registry);
}
final Pair pair = getRegisterPair(lhs, rhs);
registry.add(pair);
}
/**
*
* Unregisters the given object pair.
*
*
*
* Used by the reflection methods to avoid infinite loops.
*
* @param lhs
* {@code this} object to unregister
* @param rhs
* the other object to unregister
* @since 3.0
*/
private static void unregister(final Object lhs,final Object rhs){
final Set> registry = getRegistry();
if (registry != null){
final Pair pair = getRegisterPair(lhs, rhs);
registry.remove(pair);
if (registry.isEmpty()){
REGISTRY.remove();
}
}
}
/**
* If the fields tested are equals.
* The default value is {@code true}.
*/
private boolean isEquals = true;
private boolean testTransients = false;
private boolean testRecursive = false;
private List> bypassReflectionClasses;
private Class reflectUpToClass = null;
private String[] excludeFields = null;
/**
*
* Constructor for EqualsBuilder.
*
*
*
* Starts off assuming that equals is {@code true}.
*
*
* @see Object#equals(Object)
*/
public EqualsBuilder(){
// set up default classes to bypass reflection for
bypassReflectionClasses = new ArrayList<>();
bypassReflectionClasses.add(String.class); //hashCode field being lazy but not transient
}
//-------------------------------------------------------------------------
/**
* Set whether to include transient fields when reflectively comparing objects.
*
* @param testTransients
* whether to test transient fields
* @return EqualsBuilder - used to chain calls.
* @since 3.6
*/
public EqualsBuilder setTestTransients(final boolean testTransients){
this.testTransients = testTransients;
return this;
}
/**
* Set whether to include transient fields when reflectively comparing objects.
*
* @param testRecursive
* whether to do a recursive test
* @return EqualsBuilder - used to chain calls.
* @since 3.6
*/
public EqualsBuilder setTestRecursive(final boolean testRecursive){
this.testRecursive = testRecursive;
return this;
}
/**
*
* Set {@code Class}es whose instances should be compared by calling their {@code equals}
* although being in recursive mode. So the fields of theses classes will not be compared recursively by reflection.
*
*
*
* Here you should name classes having non-transient fields which are cache fields being set lazily.
* Prominent example being {@link String} class with its hash code cache field. Due to the importance
* of the {@code String} class, it is included in the default bypasses classes. Usually, if you use
* your own set of classes here, remember to include {@code String} class, too.
*
*
* @param bypassReflectionClasses
* classes to bypass reflection test
* @return EqualsBuilder - used to chain calls.
* @since 3.8
*/
public EqualsBuilder setBypassReflectionClasses(final List> bypassReflectionClasses){
this.bypassReflectionClasses = bypassReflectionClasses;
return this;
}
/**
* Set the superclass to reflect up to at reflective tests.
*
* @param reflectUpToClass
* the super class to reflect up to
* @return EqualsBuilder - used to chain calls.
* @since 3.6
*/
public EqualsBuilder setReflectUpToClass(final Class reflectUpToClass){
this.reflectUpToClass = reflectUpToClass;
return this;
}
/**
* Set field names to be excluded by reflection tests.
*
* @param excludeFields
* the fields to exclude
* @return EqualsBuilder - used to chain calls.
* @since 3.6
*/
public EqualsBuilder setExcludeFields(final String...excludeFields){
this.excludeFields = excludeFields;
return this;
}
/**
*
* This method uses reflection to determine if the two {@code Object}s
* are equal.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* Transient members will be not be tested, as they are likely derived
* fields, and not part of the value of the Object.
*
*
*
* Static fields will not be tested. Superclass fields will be included.
*
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
* @param excludeFields
* Collection of String field names to exclude from testing
* @return {@code true} if the two Objects have tested equals.
*
* @see EqualsExclude
*/
public static boolean reflectionEquals(final Object lhs,final Object rhs,final Collection excludeFields){
return reflectionEquals(lhs, rhs, ReflectionToStringBuilder.toNoNullStringArray(excludeFields));
}
/**
*
* This method uses reflection to determine if the two {@code Object}s
* are equal.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* Transient members will be not be tested, as they are likely derived
* fields, and not part of the value of the Object.
*
*
*
* Static fields will not be tested. Superclass fields will be included.
*
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
* @param excludeFields
* array of field names to exclude from testing
* @return {@code true} if the two Objects have tested equals.
*
* @see EqualsExclude
*/
public static boolean reflectionEquals(final Object lhs,final Object rhs,final String...excludeFields){
return reflectionEquals(lhs, rhs, false, null, excludeFields);
}
/**
*
* This method uses reflection to determine if the two {@code Object}s
* are equal.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* If the TestTransients parameter is set to {@code true}, transient
* members will be tested, otherwise they are ignored, as they are likely
* derived fields, and not part of the value of the {@code Object}.
*
*
*
* Static fields will not be tested. Superclass fields will be included.
*
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
* @param testTransients
* whether to include transient fields
* @return {@code true} if the two Objects have tested equals.
*
* @see EqualsExclude
*/
public static boolean reflectionEquals(final Object lhs,final Object rhs,final boolean testTransients){
return reflectionEquals(lhs, rhs, testTransients, null);
}
/**
*
* This method uses reflection to determine if the two {@code Object}s
* are equal.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* If the testTransients parameter is set to {@code true}, transient
* members will be tested, otherwise they are ignored, as they are likely
* derived fields, and not part of the value of the {@code Object}.
*
*
*
* Static fields will not be included. Superclass fields will be appended
* up to and including the specified superclass. A null superclass is treated
* as java.lang.Object.
*
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
* @param testTransients
* whether to include transient fields
* @param reflectUpToClass
* the superclass to reflect up to (inclusive),
* may be {@code null}
* @param excludeFields
* array of field names to exclude from testing
* @return {@code true} if the two Objects have tested equals.
*
* @see EqualsExclude
* @since 2.0
*/
public static boolean reflectionEquals(
final Object lhs,
final Object rhs,
final boolean testTransients,
final Class reflectUpToClass,
final String...excludeFields){
return reflectionEquals(lhs, rhs, testTransients, reflectUpToClass, false, excludeFields);
}
/**
*
* This method uses reflection to determine if the two {@code Object}s
* are equal.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* If the testTransients parameter is set to {@code true}, transient
* members will be tested, otherwise they are ignored, as they are likely
* derived fields, and not part of the value of the {@code Object}.
*
*
*
* Static fields will not be included. Superclass fields will be appended
* up to and including the specified superclass. A null superclass is treated
* as java.lang.Object.
*
*
*
* If the testRecursive parameter is set to {@code true}, non primitive
* (and non primitive wrapper) field types will be compared by
* {@code EqualsBuilder} recursively instead of invoking their
* {@code equals()} method. Leading to a deep reflection equals test.
*
* @param lhs
* {@code this} object
* @param rhs
* the other object
* @param testTransients
* whether to include transient fields
* @param reflectUpToClass
* the superclass to reflect up to (inclusive),
* may be {@code null}
* @param testRecursive
* whether to call reflection equals on non primitive
* fields recursively.
* @param excludeFields
* array of field names to exclude from testing
* @return {@code true} if the two Objects have tested equals.
*
* @see EqualsExclude
* @since 3.6
*/
public static boolean reflectionEquals(
final Object lhs,
final Object rhs,
final boolean testTransients,
final Class reflectUpToClass,
final boolean testRecursive,
final String...excludeFields){
if (lhs == rhs){
return true;
}
if (lhs == null || rhs == null){
return false;
}
return new EqualsBuilder().setExcludeFields(excludeFields).setReflectUpToClass(reflectUpToClass).setTestTransients(testTransients)
.setTestRecursive(testRecursive).reflectionAppend(lhs, rhs).isEquals();
}
/**
*
* Tests if two {@code objects} by using reflection.
*
*
*
* It uses {@code AccessibleObject.setAccessible} to gain access to private
* fields. This means that it will throw a security exception if run under
* a security manager, if the permissions are not set up correctly. It is also
* not as efficient as testing explicitly. Non-primitive fields are compared using
* {@code equals()}.
*
*
*
* If the testTransients field is set to {@code true}, transient
* members will be tested, otherwise they are ignored, as they are likely
* derived fields, and not part of the value of the {@code Object}.
*
*
*
* Static fields will not be included. Superclass fields will be appended
* up to and including the specified superclass in field {@code reflectUpToClass}.
* A null superclass is treated as java.lang.Object.
*
*
*
* Field names listed in field {@code excludeFields} will be ignored.
*
*
*
* If either class of the compared objects is contained in
* {@code bypassReflectionClasses}, both objects are compared by calling
* the equals method of the left hand object with the right hand object as an argument.
*
*
* @param lhs
* the left hand object
* @param rhs
* the left hand object
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder reflectionAppend(final Object lhs,final Object rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
isEquals = false;
return this;
}
// Find the leaf class since there may be transients in the leaf
// class or in classes between the leaf and root.
// If we are not testing transients or a subclass has no ivars,
// then a subclass can test equals to a superclass.
final Class lhsClass = lhs.getClass();
final Class rhsClass = rhs.getClass();
Class testClass;
if (lhsClass.isInstance(rhs)){
testClass = lhsClass;
if (!rhsClass.isInstance(lhs)){
// rhsClass is a subclass of lhsClass
testClass = rhsClass;
}
}else if (rhsClass.isInstance(lhs)){
testClass = rhsClass;
if (!lhsClass.isInstance(rhs)){
// lhsClass is a subclass of rhsClass
testClass = lhsClass;
}
}else{
// The two classes are not related.
isEquals = false;
return this;
}
try{
if (testClass.isArray()){
append(lhs, rhs);
}else{
//If either class is being excluded, call normal object equals method on lhsClass.
if (bypassReflectionClasses != null
&& (bypassReflectionClasses.contains(lhsClass) || bypassReflectionClasses.contains(rhsClass))){
isEquals = lhs.equals(rhs);
}else{
reflectionAppend(lhs, rhs, testClass);
while (testClass.getSuperclass() != null && testClass != reflectUpToClass){
testClass = testClass.getSuperclass();
reflectionAppend(lhs, rhs, testClass);
}
}
}
}catch (final IllegalArgumentException e){
// In this case, we tried to test a subclass vs. a superclass and
// the subclass has ivars or the ivars are transient and
// we are testing transients.
// If a subclass has ivars that we are trying to test them, we get an
// exception and we know that the objects are not equal.
isEquals = false;
return this;
}
return this;
}
/**
*
* Appends the fields and values defined by the given object of the
* given Class.
*
*
* @param lhs
* the left hand object
* @param rhs
* the right hand object
* @param clazz
* the class to append details of
*/
private void reflectionAppend(final Object lhs,final Object rhs,final Class clazz){
if (isRegistered(lhs, rhs)){
return;
}
try{
register(lhs, rhs);
final Field[] fields = clazz.getDeclaredFields();
AccessibleObject.setAccessible(fields, true);
for (int i = 0; i < fields.length && isEquals; i++){
final Field f = fields[i];
if (!ArrayUtils.contains(excludeFields, f.getName()) && !f.getName().contains("$")
&& (testTransients || !Modifier.isTransient(f.getModifiers())) && !Modifier.isStatic(f.getModifiers())
&& !f.isAnnotationPresent(EqualsExclude.class)){
try{
append(f.get(lhs), f.get(rhs));
}catch (final IllegalAccessException e){
//this can't happen. Would get a Security exception instead
//throw a runtime exception in case the impossible happens.
throw new InternalError("Unexpected IllegalAccessException");
}
}
}
}finally{
unregister(lhs, rhs);
}
}
//-------------------------------------------------------------------------
/**
*
* Adds the result of {@code super.equals()} to this builder.
*
*
* @param superEquals
* the result of calling {@code super.equals()}
* @return EqualsBuilder - used to chain calls.
* @since 2.0
*/
public EqualsBuilder appendSuper(final boolean superEquals){
if (!isEquals){
return this;
}
isEquals = superEquals;
return this;
}
//-------------------------------------------------------------------------
/**
*
* Test if two {@code Object}s are equal using either
* #{@link #reflectionAppend(Object, Object)}, if object are non
* primitives (or wrapper of primitives) or if field {@code testRecursive}
* is set to {@code false}. Otherwise, using their
* {@code equals} method.
*
*
* @param lhs
* the left hand object
* @param rhs
* the right hand object
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final Object lhs,final Object rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
final Class lhsClass = lhs.getClass();
if (lhsClass.isArray()){
// factor out array case in order to keep method small enough
// to be inlined
appendArray(lhs, rhs);
}else{
// The simple case, not an array, just test the element
if (testRecursive && !ClassUtils.isPrimitiveOrWrapper(lhsClass)){
reflectionAppend(lhs, rhs);
}else{
isEquals = lhs.equals(rhs);
}
}
return this;
}
/**
*
* Test if an {@code Object} is equal to an array.
*
*
* @param lhs
* the left hand object, an array
* @param rhs
* the right hand object
*/
private void appendArray(final Object lhs,final Object rhs){
// First we compare different dimensions, for example: a boolean[][] to a boolean[]
// then we 'Switch' on type of array, to dispatch to the correct handler
// This handles multi dimensional arrays of the same depth
if (lhs.getClass() != rhs.getClass()){
this.setEquals(false);
}else if (lhs instanceof long[]){
append((long[]) lhs, (long[]) rhs);
}else if (lhs instanceof int[]){
append((int[]) lhs, (int[]) rhs);
}else if (lhs instanceof short[]){
append((short[]) lhs, (short[]) rhs);
}else if (lhs instanceof char[]){
append((char[]) lhs, (char[]) rhs);
}else if (lhs instanceof byte[]){
append((byte[]) lhs, (byte[]) rhs);
}else if (lhs instanceof double[]){
append((double[]) lhs, (double[]) rhs);
}else if (lhs instanceof float[]){
append((float[]) lhs, (float[]) rhs);
}else if (lhs instanceof boolean[]){
append((boolean[]) lhs, (boolean[]) rhs);
}else{
// Not an array of primitives
append((Object[]) lhs, (Object[]) rhs);
}
}
/**
*
* Test if two {@code long} s are equal.
*
*
* @param lhs
* the left hand {@code long}
* @param rhs
* the right hand {@code long}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final long lhs,final long rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Test if two {@code int}s are equal.
*
*
* @param lhs
* the left hand {@code int}
* @param rhs
* the right hand {@code int}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final int lhs,final int rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Test if two {@code short}s are equal.
*
*
* @param lhs
* the left hand {@code short}
* @param rhs
* the right hand {@code short}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final short lhs,final short rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Test if two {@code char}s are equal.
*
*
* @param lhs
* the left hand {@code char}
* @param rhs
* the right hand {@code char}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final char lhs,final char rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Test if two {@code byte}s are equal.
*
*
* @param lhs
* the left hand {@code byte}
* @param rhs
* the right hand {@code byte}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final byte lhs,final byte rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Test if two {@code double}s are equal by testing that the
* pattern of bits returned by {@code doubleToLong} are equal.
*
*
*
* This handles NaNs, Infinities, and {@code -0.0}.
*
*
*
* It is compatible with the hash code generated by
* {@code HashCodeBuilder}.
*
*
* @param lhs
* the left hand {@code double}
* @param rhs
* the right hand {@code double}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final double lhs,final double rhs){
if (!isEquals){
return this;
}
return append(Double.doubleToLongBits(lhs), Double.doubleToLongBits(rhs));
}
/**
*
* Test if two {@code float}s are equal by testing that the
* pattern of bits returned by doubleToLong are equal.
*
*
*
* This handles NaNs, Infinities, and {@code -0.0}.
*
*
*
* It is compatible with the hash code generated by
* {@code HashCodeBuilder}.
*
*
* @param lhs
* the left hand {@code float}
* @param rhs
* the right hand {@code float}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final float lhs,final float rhs){
if (!isEquals){
return this;
}
return append(Float.floatToIntBits(lhs), Float.floatToIntBits(rhs));
}
/**
*
* Test if two {@code booleans}s are equal.
*
*
* @param lhs
* the left hand {@code boolean}
* @param rhs
* the right hand {@code boolean}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final boolean lhs,final boolean rhs){
if (!isEquals){
return this;
}
isEquals = lhs == rhs;
return this;
}
/**
*
* Performs a deep comparison of two {@code Object} arrays.
*
*
*
* This also will be called for the top level of
* multi-dimensional, ragged, and multi-typed arrays.
*
*
*
* Note that this method does not compare the type of the arrays; it only
* compares the contents.
*
*
* @param lhs
* the left hand {@code Object[]}
* @param rhs
* the right hand {@code Object[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final Object[] lhs,final Object[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code long}. Length and all
* values are compared.
*
*
*
* The method {@link #append(long, long)} is used.
*
*
* @param lhs
* the left hand {@code long[]}
* @param rhs
* the right hand {@code long[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final long[] lhs,final long[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code int}. Length and all
* values are compared.
*
*
*
* The method {@link #append(int, int)} is used.
*
*
* @param lhs
* the left hand {@code int[]}
* @param rhs
* the right hand {@code int[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final int[] lhs,final int[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code short}. Length and all
* values are compared.
*
*
*
* The method {@link #append(short, short)} is used.
*
*
* @param lhs
* the left hand {@code short[]}
* @param rhs
* the right hand {@code short[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final short[] lhs,final short[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code char}. Length and all
* values are compared.
*
*
*
* The method {@link #append(char, char)} is used.
*
*
* @param lhs
* the left hand {@code char[]}
* @param rhs
* the right hand {@code char[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final char[] lhs,final char[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code byte}. Length and all
* values are compared.
*
*
*
* The method {@link #append(byte, byte)} is used.
*
*
* @param lhs
* the left hand {@code byte[]}
* @param rhs
* the right hand {@code byte[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final byte[] lhs,final byte[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code double}. Length and all
* values are compared.
*
*
*
* The method {@link #append(double, double)} is used.
*
*
* @param lhs
* the left hand {@code double[]}
* @param rhs
* the right hand {@code double[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final double[] lhs,final double[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code float}. Length and all
* values are compared.
*
*
*
* The method {@link #append(float, float)} is used.
*
*
* @param lhs
* the left hand {@code float[]}
* @param rhs
* the right hand {@code float[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final float[] lhs,final float[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Deep comparison of array of {@code boolean}. Length and all
* values are compared.
*
*
*
* The method {@link #append(boolean, boolean)} is used.
*
*
* @param lhs
* the left hand {@code boolean[]}
* @param rhs
* the right hand {@code boolean[]}
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(final boolean[] lhs,final boolean[] rhs){
if (!isEquals){
return this;
}
if (lhs == rhs){
return this;
}
if (lhs == null || rhs == null){
this.setEquals(false);
return this;
}
if (lhs.length != rhs.length){
this.setEquals(false);
return this;
}
for (int i = 0; i < lhs.length && isEquals; ++i){
append(lhs[i], rhs[i]);
}
return this;
}
/**
*
* Returns {@code true} if the fields that have been checked
* are all equal.
*
*
* @return boolean
*/
public boolean isEquals(){
return this.isEquals;
}
/**
*
* Returns {@code true} if the fields that have been checked
* are all equal.
*
*
* @return {@code true} if all of the fields that have been checked
* are equal, {@code false} otherwise.
*
* @since 3.0
*/
@Override
public Boolean build(){
return Boolean.valueOf(isEquals());
}
/**
* Sets the {@code isEquals} value.
*
* @param isEquals
* The value to set.
* @since 2.1
*/
protected void setEquals(final boolean isEquals){
this.isEquals = isEquals;
}
/**
* Reset the EqualsBuilder so you can use the same object again
*
* @since 2.5
*/
public void reset(){
this.isEquals = true;
}
}