org.apache.cayenne.util.EqualsBuilder Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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 org.apache.cayenne.util;
/**
* Assists in implementing {@link Object#equals(Object)} methods. The code is based on
* EqualsBuilder from commons-lang 2.1.
*
* @since 3.0
*/
public class EqualsBuilder {
/**
* If the fields tested are equals. The default value is true.
*/
private boolean isEquals = true;
/**
*
* Adds the result of super.equals() to this builder.
*
*
* @param superEquals the result of calling super.equals()
* @return EqualsBuilder - used to chain calls.
* @since 2.0
*/
public EqualsBuilder appendSuper(boolean superEquals) {
if (isEquals == false) {
return this;
}
isEquals = superEquals;
return this;
}
// -------------------------------------------------------------------------
/**
*
* Test if two Objects are equal using their equals
* method.
*
*
* @param lhs the left hand object
* @param rhs the right hand object
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(Object lhs, Object rhs) {
if (isEquals == false) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
this.setEquals(false);
return this;
}
Class lhsClass = lhs.getClass();
if (!lhsClass.isArray()) {
// The simple case, not an array, just test the element
isEquals = lhs.equals(rhs);
}
else if (lhs.getClass() != rhs.getClass()) {
// Here when we compare different dimensions, for example: a boolean[][] to a
// boolean[]
this.setEquals(false);
}
// 'Switch' on type of array, to dispatch to the correct handler
// This handles multi dimensional arrays of the same depth
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);
}
return this;
}
/**
*
* Test if two long s are equal.
*
*
* @param lhs the left hand long
* @param rhs the right hand long
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(long lhs, long rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Test if two ints are equal.
*
*
* @param lhs the left hand int
* @param rhs the right hand int
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(int lhs, int rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Test if two shorts are equal.
*
*
* @param lhs the left hand short
* @param rhs the right hand short
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(short lhs, short rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Test if two chars are equal.
*
*
* @param lhs the left hand char
* @param rhs the right hand char
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(char lhs, char rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Test if two bytes are equal.
*
*
* @param lhs the left hand byte
* @param rhs the right hand byte
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(byte lhs, byte rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Test if two doubles are equal by testing that the pattern of bits
* returned by doubleToLong are equal.
*
*
* This handles NaNs, Infinities, and -0.0.
*
*
* It is compatible with the hash code generated by HashCodeBuilder.
*
*
* @param lhs the left hand double
* @param rhs the right hand double
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(double lhs, double rhs) {
if (isEquals == false) {
return this;
}
return append(Double.doubleToLongBits(lhs), Double.doubleToLongBits(rhs));
}
/**
*
* Test if two floats are equal byt testing that the pattern of bits
* returned by doubleToLong are equal.
*
*
* This handles NaNs, Infinities, and -0.0.
*
*
* It is compatible with the hash code generated by HashCodeBuilder.
*
*
* @param lhs the left hand float
* @param rhs the right hand float
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(float lhs, float rhs) {
if (isEquals == false) {
return this;
}
return append(Float.floatToIntBits(lhs), Float.floatToIntBits(rhs));
}
/**
*
* Test if two booleanss are equal.
*
*
* @param lhs the left hand boolean
* @param rhs the right hand boolean
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(boolean lhs, boolean rhs) {
if (isEquals == false) {
return this;
}
isEquals = (lhs == rhs);
return this;
}
/**
*
* Performs a deep comparison of two Object arrays.
*
*
* This also will be called for the top level of multi-dimensional, ragged, and
* multi-typed arrays.
*
*
* @param lhs the left hand Object[]
* @param rhs the right hand Object[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(Object[] lhs, Object[] rhs) {
if (isEquals == false) {
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 long. Length and all values are
* compared.
*
*
* The method {@link #append(long, long)} is used.
*
*
* @param lhs the left hand long[]
* @param rhs the right hand long[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(long[] lhs, long[] rhs) {
if (isEquals == false) {
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 int. Length and all values are
* compared.
*
*
* The method {@link #append(int, int)} is used.
*
*
* @param lhs the left hand int[]
* @param rhs the right hand int[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(int[] lhs, int[] rhs) {
if (isEquals == false) {
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 short. Length and all values are
* compared.
*
*
* The method {@link #append(short, short)} is used.
*
*
* @param lhs the left hand short[]
* @param rhs the right hand short[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(short[] lhs, short[] rhs) {
if (isEquals == false) {
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 char. Length and all values are
* compared.
*
*
* The method {@link #append(char, char)} is used.
*
*
* @param lhs the left hand char[]
* @param rhs the right hand char[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(char[] lhs, char[] rhs) {
if (isEquals == false) {
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 byte. Length and all values are
* compared.
*
*
* The method {@link #append(byte, byte)} is used.
*
*
* @param lhs the left hand byte[]
* @param rhs the right hand byte[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(byte[] lhs, byte[] rhs) {
if (isEquals == false) {
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 double. Length and all values are
* compared.
*
*
* The method {@link #append(double, double)} is used.
*
*
* @param lhs the left hand double[]
* @param rhs the right hand double[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(double[] lhs, double[] rhs) {
if (isEquals == false) {
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 float. Length and all values are
* compared.
*
*
* The method {@link #append(float, float)} is used.
*
*
* @param lhs the left hand float[]
* @param rhs the right hand float[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(float[] lhs, float[] rhs) {
if (isEquals == false) {
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 boolean. Length and all values are
* compared.
*
*
* The method {@link #append(boolean, boolean)} is used.
*
*
* @param lhs the left hand boolean[]
* @param rhs the right hand boolean[]
* @return EqualsBuilder - used to chain calls.
*/
public EqualsBuilder append(boolean[] lhs, boolean[] rhs) {
if (isEquals == false) {
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 true if the fields that have been checked are all equal.
*
*
* @return boolean
*/
public boolean isEquals() {
return this.isEquals;
}
/**
* Sets the isEquals value.
*
* @param isEquals The value to set.
* @since 2.1
*/
protected void setEquals(boolean isEquals) {
this.isEquals = isEquals;
}
}