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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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/*
 * 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 org.apache.commons.lang3.builder;

import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.Comparator;

import org.apache.commons.lang3.ArrayUtils;

/**
 * Assists in implementing {@link java.lang.Comparable#compareTo(Object)} methods.
 *
 * 

It is consistent with equals(Object) and * hashcode() built with {@link EqualsBuilder} and * {@link HashCodeBuilder}.

* *

Two Objects that compare equal using equals(Object) should normally * also compare equal using compareTo(Object).

* *

All relevant fields should be included in the calculation of the * comparison. Derived fields may be ignored. The same fields, in the same * order, should be used in both compareTo(Object) and * equals(Object).

* *

To use this class write code as follows:

* *
 * public class MyClass {
 *   String field1;
 *   int field2;
 *   boolean field3;
 *
 *   ...
 *
 *   public int compareTo(Object o) {
 *     MyClass myClass = (MyClass) o;
 *     return new CompareToBuilder()
 *       .appendSuper(super.compareTo(o)
 *       .append(this.field1, myClass.field1)
 *       .append(this.field2, myClass.field2)
 *       .append(this.field3, myClass.field3)
 *       .toComparison();
 *   }
 * }
 * 
* *

Values are compared in the order they are appended to the builder. If any comparison returns * a non-zero result, then that value will be the result returned by {@code toComparison()} and all * subsequent comparisons are skipped.

* *

Alternatively, there are {@link #reflectionCompare(Object, Object) reflectionCompare} methods that use * reflection to determine the fields to append. Because fields can be private, * reflectionCompare uses {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} to * bypass normal access control checks. This will fail under a security manager, * unless the appropriate permissions are set up correctly. It is also * slower than appending explicitly.

* *

A typical implementation of compareTo(Object) using * reflectionCompare looks like:

*
 * public int compareTo(Object o) {
 *   return CompareToBuilder.reflectionCompare(this, o);
 * }
 * 
* *

The reflective methods compare object fields in the order returned by * {@link Class#getDeclaredFields()}. The fields of the class are compared first, followed by those * of its parent classes (in order from the bottom to the top of the class hierarchy).

* * @see java.lang.Comparable * @see java.lang.Object#equals(Object) * @see java.lang.Object#hashCode() * @see EqualsBuilder * @see HashCodeBuilder * @since 1.0 */ public class CompareToBuilder implements Builder { /** * Current state of the comparison as appended fields are checked. */ private int comparison; /** *

Constructor for CompareToBuilder.

* *

Starts off assuming that the objects are equal. Multiple calls are * then made to the various append methods, followed by a call to * {@link #toComparison} to get the result.

*/ public CompareToBuilder() { super(); comparison = 0; } //----------------------------------------------------------------------- /** *

Compares two Objects via reflection.

* *

Fields can be private, thus AccessibleObject.setAccessible * is used to bypass normal access control checks. This will fail under a * security manager unless the appropriate permissions are set.

* *
    *
  • Static fields will not be compared
  • *
  • Transient members will be not be compared, as they are likely derived * fields
  • *
  • Superclass fields will be compared
  • *
* *

If both lhs and rhs are null, * they are considered equal.

* * @param lhs left-hand object * @param rhs right-hand object * @return a negative integer, zero, or a positive integer as lhs * is less than, equal to, or greater than rhs * @throws NullPointerException if either (but not both) parameters are * null * @throws ClassCastException if rhs is not assignment-compatible * with lhs */ public static int reflectionCompare(final Object lhs, final Object rhs) { return reflectionCompare(lhs, rhs, false, null); } /** *

Compares two Objects via reflection.

* *

Fields can be private, thus AccessibleObject.setAccessible * is used to bypass normal access control checks. This will fail under a * security manager unless the appropriate permissions are set.

* *
    *
  • Static fields will not be compared
  • *
  • If compareTransients is true, * compares transient members. Otherwise ignores them, as they * are likely derived fields.
  • *
  • Superclass fields will be compared
  • *
* *

If both lhs and rhs are null, * they are considered equal.

* * @param lhs left-hand object * @param rhs right-hand object * @param compareTransients whether to compare transient fields * @return a negative integer, zero, or a positive integer as lhs * is less than, equal to, or greater than rhs * @throws NullPointerException if either lhs or rhs * (but not both) is null * @throws ClassCastException if rhs is not assignment-compatible * with lhs */ public static int reflectionCompare(final Object lhs, final Object rhs, final boolean compareTransients) { return reflectionCompare(lhs, rhs, compareTransients, null); } /** *

Compares two Objects via reflection.

* *

Fields can be private, thus AccessibleObject.setAccessible * is used to bypass normal access control checks. This will fail under a * security manager unless the appropriate permissions are set.

* *
    *
  • Static fields will not be compared
  • *
  • If compareTransients is true, * compares transient members. Otherwise ignores them, as they * are likely derived fields.
  • *
  • Superclass fields will be compared
  • *
* *

If both lhs and rhs are null, * they are considered equal.

* * @param lhs left-hand object * @param rhs right-hand object * @param excludeFields Collection of String fields to exclude * @return a negative integer, zero, or a positive integer as lhs * is less than, equal to, or greater than rhs * @throws NullPointerException if either lhs or rhs * (but not both) is null * @throws ClassCastException if rhs is not assignment-compatible * with lhs * @since 2.2 */ public static int reflectionCompare(final Object lhs, final Object rhs, final Collection excludeFields) { return reflectionCompare(lhs, rhs, ReflectionToStringBuilder.toNoNullStringArray(excludeFields)); } /** *

Compares two Objects via reflection.

* *

Fields can be private, thus AccessibleObject.setAccessible * is used to bypass normal access control checks. This will fail under a * security manager unless the appropriate permissions are set.

* *
    *
  • Static fields will not be compared
  • *
  • If compareTransients is true, * compares transient members. Otherwise ignores them, as they * are likely derived fields.
  • *
  • Superclass fields will be compared
  • *
* *

If both lhs and rhs are null, * they are considered equal.

* * @param lhs left-hand object * @param rhs right-hand object * @param excludeFields array of fields to exclude * @return a negative integer, zero, or a positive integer as lhs * is less than, equal to, or greater than rhs * @throws NullPointerException if either lhs or rhs * (but not both) is null * @throws ClassCastException if rhs is not assignment-compatible * with lhs * @since 2.2 */ public static int reflectionCompare(final Object lhs, final Object rhs, final String... excludeFields) { return reflectionCompare(lhs, rhs, false, null, excludeFields); } /** *

Compares two Objects via reflection.

* *

Fields can be private, thus AccessibleObject.setAccessible * is used to bypass normal access control checks. This will fail under a * security manager unless the appropriate permissions are set.

* *
    *
  • Static fields will not be compared
  • *
  • If the compareTransients is true, * compares transient members. Otherwise ignores them, as they * are likely derived fields.
  • *
  • Compares superclass fields up to and including reflectUpToClass. * If reflectUpToClass is null, compares all superclass fields.
  • *
* *

If both lhs and rhs are null, * they are considered equal.

* * @param lhs left-hand object * @param rhs right-hand object * @param compareTransients whether to compare transient fields * @param reflectUpToClass last superclass for which fields are compared * @param excludeFields fields to exclude * @return a negative integer, zero, or a positive integer as lhs * is less than, equal to, or greater than rhs * @throws NullPointerException if either lhs or rhs * (but not both) is null * @throws ClassCastException if rhs is not assignment-compatible * with lhs * @since 2.2 (2.0 as reflectionCompare(Object, Object, boolean, Class)) */ public static int reflectionCompare( final Object lhs, final Object rhs, final boolean compareTransients, final Class reflectUpToClass, final String... excludeFields) { if (lhs == rhs) { return 0; } if (lhs == null || rhs == null) { throw new NullPointerException(); } Class lhsClazz = lhs.getClass(); if (!lhsClazz.isInstance(rhs)) { throw new ClassCastException(); } final CompareToBuilder compareToBuilder = new CompareToBuilder(); reflectionAppend(lhs, rhs, lhsClazz, compareToBuilder, compareTransients, excludeFields); while (lhsClazz.getSuperclass() != null && lhsClazz != reflectUpToClass) { lhsClazz = lhsClazz.getSuperclass(); reflectionAppend(lhs, rhs, lhsClazz, compareToBuilder, compareTransients, excludeFields); } return compareToBuilder.toComparison(); } /** *

Appends to builder the comparison of lhs * to rhs using the fields defined in clazz.

* * @param lhs left-hand object * @param rhs right-hand object * @param clazz Class that defines fields to be compared * @param builder CompareToBuilder to append to * @param useTransients whether to compare transient fields * @param excludeFields fields to exclude */ private static void reflectionAppend( final Object lhs, final Object rhs, final Class clazz, final CompareToBuilder builder, final boolean useTransients, final String[] excludeFields) { final Field[] fields = clazz.getDeclaredFields(); AccessibleObject.setAccessible(fields, true); for (int i = 0; i < fields.length && builder.comparison == 0; i++) { final Field f = fields[i]; if (!ArrayUtils.contains(excludeFields, f.getName()) && !f.getName().contains("$") && (useTransients || !Modifier.isTransient(f.getModifiers())) && !Modifier.isStatic(f.getModifiers())) { try { builder.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"); } } } } //----------------------------------------------------------------------- /** *

Appends to the builder the compareTo(Object) * result of the superclass.

* * @param superCompareTo result of calling super.compareTo(Object) * @return this - used to chain append calls * @since 2.0 */ public CompareToBuilder appendSuper(final int superCompareTo) { if (comparison != 0) { return this; } comparison = superCompareTo; return this; } //----------------------------------------------------------------------- /** *

Appends to the builder the comparison of * two Objects.

* *
    *
  1. Check if lhs == rhs
  2. *
  3. Check if either lhs or rhs is null, * a null object is less than a non-null object
  4. *
  5. Check the object contents
  6. *
* *

lhs must either be an array or implement {@link Comparable}.

* * @param lhs left-hand object * @param rhs right-hand object * @return this - used to chain append calls * @throws ClassCastException if rhs is not assignment-compatible * with lhs */ public CompareToBuilder append(final Object lhs, final Object rhs) { return append(lhs, rhs, null); } /** *

Appends to the builder the comparison of * two Objects.

* *
    *
  1. Check if lhs == rhs
  2. *
  3. Check if either lhs or rhs is null, * a null object is less than a non-null object
  4. *
  5. Check the object contents
  6. *
* *

If lhs is an array, array comparison methods will be used. * Otherwise comparator will be used to compare the objects. * If comparator is null, lhs must * implement {@link Comparable} instead.

* * @param lhs left-hand object * @param rhs right-hand object * @param comparator Comparator used to compare the objects, * null means treat lhs as Comparable * @return this - used to chain append calls * @throws ClassCastException if rhs is not assignment-compatible * with lhs * @since 2.0 */ public CompareToBuilder append(final Object lhs, final Object rhs, final Comparator comparator) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.getClass().isArray()) { // factor out array case in order to keep method small enough to be inlined appendArray(lhs, rhs, comparator); } else { // the simple case, not an array, just test the element if (comparator == null) { @SuppressWarnings("unchecked") // assume this can be done; if not throw CCE as per Javadoc final Comparable comparable = (Comparable) lhs; comparison = comparable.compareTo(rhs); } else { @SuppressWarnings("unchecked") // assume this can be done; if not throw CCE as per Javadoc final Comparator comparator2 = (Comparator) comparator; comparison = comparator2.compare(lhs, rhs); } } return this; } private void appendArray(final Object lhs, final Object rhs, final Comparator comparator) { // switch on type of array, to dispatch to the correct handler // handles multi dimensional arrays // throws a ClassCastException if rhs is not the correct array type 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 // throws a ClassCastException if rhs is not an array append((Object[]) lhs, (Object[]) rhs, comparator); } } //------------------------------------------------------------------------- /** * Appends to the builder the comparison of * two longs. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final long lhs, final long rhs) { if (comparison != 0) { return this; } comparison = Long.compare(lhs, rhs); return this; } /** * Appends to the builder the comparison of * two ints. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final int lhs, final int rhs) { if (comparison != 0) { return this; } comparison = Integer.compare(lhs, rhs); return this; } /** * Appends to the builder the comparison of * two shorts. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final short lhs, final short rhs) { if (comparison != 0) { return this; } comparison = Short.compare(lhs, rhs); return this; } /** * Appends to the builder the comparison of * two chars. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final char lhs, final char rhs) { if (comparison != 0) { return this; } comparison = Character.compare(lhs, rhs); return this; } /** * Appends to the builder the comparison of * two bytes. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final byte lhs, final byte rhs) { if (comparison != 0) { return this; } comparison = Byte.compare(lhs, rhs); return this; } /** *

Appends to the builder the comparison of * two doubles.

* *

This handles NaNs, Infinities, and -0.0.

* *

It is compatible with the hash code generated by * HashCodeBuilder.

* * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final double lhs, final double rhs) { if (comparison != 0) { return this; } comparison = Double.compare(lhs, rhs); return this; } /** *

Appends to the builder the comparison of * two floats.

* *

This handles NaNs, Infinities, and -0.0.

* *

It is compatible with the hash code generated by * HashCodeBuilder.

* * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final float lhs, final float rhs) { if (comparison != 0) { return this; } comparison = Float.compare(lhs, rhs); return this; } /** * Appends to the builder the comparison of * two booleanss. * * @param lhs left-hand value * @param rhs right-hand value * @return this - used to chain append calls */ public CompareToBuilder append(final boolean lhs, final boolean rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs) { comparison = 1; } else { comparison = -1; } return this; } //----------------------------------------------------------------------- /** *

Appends to the builder the deep comparison of * two Object arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a short length array is less than a long length array
  6. *
  7. Check array contents element by element using {@link #append(Object, Object, Comparator)}
  8. *
* *

This method will also will be called for the top level of multi-dimensional, * ragged, and multi-typed arrays.

* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls * @throws ClassCastException if rhs is not assignment-compatible * with lhs */ public CompareToBuilder append(final Object[] lhs, final Object[] rhs) { return append(lhs, rhs, null); } /** *

Appends to the builder the deep comparison of * two Object arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a short length array is less than a long length array
  6. *
  7. Check array contents element by element using {@link #append(Object, Object, Comparator)}
  8. *
* *

This method will also will be called for the top level of multi-dimensional, * ragged, and multi-typed arrays.

* * @param lhs left-hand array * @param rhs right-hand array * @param comparator Comparator to use to compare the array elements, * null means to treat lhs elements as Comparable. * @return this - used to chain append calls * @throws ClassCastException if rhs is not assignment-compatible * with lhs * @since 2.0 */ public CompareToBuilder append(final Object[] lhs, final Object[] rhs, final Comparator comparator) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i], comparator); } return this; } /** *

Appends to the builder the deep comparison of * two long arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(long, long)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final long[] lhs, final long[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two int arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(int, int)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final int[] lhs, final int[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two short arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(short, short)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final short[] lhs, final short[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two char arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(char, char)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final char[] lhs, final char[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two byte arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(byte, byte)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final byte[] lhs, final byte[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two double arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(double, double)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final double[] lhs, final double[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two float arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(float, float)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final float[] lhs, final float[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } /** *

Appends to the builder the deep comparison of * two boolean arrays.

* *
    *
  1. Check if arrays are the same using ==
  2. *
  3. Check if for null, null is less than non-null
  4. *
  5. Check array length, a shorter length array is less than a longer length array
  6. *
  7. Check array contents element by element using {@link #append(boolean, boolean)}
  8. *
* * @param lhs left-hand array * @param rhs right-hand array * @return this - used to chain append calls */ public CompareToBuilder append(final boolean[] lhs, final boolean[] rhs) { if (comparison != 0) { return this; } if (lhs == rhs) { return this; } if (lhs == null) { comparison = -1; return this; } if (rhs == null) { comparison = 1; return this; } if (lhs.length != rhs.length) { comparison = lhs.length < rhs.length ? -1 : 1; return this; } for (int i = 0; i < lhs.length && comparison == 0; i++) { append(lhs[i], rhs[i]); } return this; } //----------------------------------------------------------------------- /** * Returns a negative integer, a positive integer, or zero as * the builder has judged the "left-hand" side * as less than, greater than, or equal to the "right-hand" * side. * * @return final comparison result * @see #build() */ public int toComparison() { return comparison; } /** * Returns a negative Integer, a positive Integer, or zero as * the builder has judged the "left-hand" side * as less than, greater than, or equal to the "right-hand" * side. * * @return final comparison result as an Integer * @see #toComparison() * @since 3.0 */ @Override public Integer build() { return Integer.valueOf(toComparison()); } }