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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();
 *   }
 * }
 * 

 *
 * 
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);
 * }
 * 

 *
 * @see java.lang.Comparable
 * @see java.lang.Object#equals(Object)
 * @see java.lang.Object#hashCode()
 * @see EqualsBuilder
 * @see HashCodeBuilder
 * @since 1.0
 * @version $Id: CompareToBuilder.java 1436770 2013-01-22 07:09:45Z ggregory $
 */
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().indexOf('$') == -1)
                && (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. 
     * 
  2. Check if either lhs or rhs is null,
     *     a null object is less than a non-null object
    3. 
     * 
  3. Check the object contents
    4. 
     * 

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

     *
     * 
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()) {
            // 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);
            }
        } 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;
    }

    //-------------------------------------------------------------------------
    /**
     * 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 = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
        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 = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
        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 = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
        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 = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
        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 = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
        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 == false) {
            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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a short length array is less than a long length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(Object, Object, Comparator)}
    5. 
     * 

     *
     * 
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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a short length array is less than a long length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(Object, Object, Comparator)}
    5. 
     * 

     *
     * 
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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(long, long)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(int, int)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(short, short)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(char, char)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(byte, byte)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(double, double)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(float, float)}
    5. 
     * 

     *
     * @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. 
     *  
  2. Check if for null, null is less than non-null
    3. 
     *  
  3. Check array length, a shorter length array is less than a longer length array
    4. 
     *  
  4. Check array contents element by element using {@link #append(boolean, boolean)}
    5. 
     * 

     *
     * @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());
    }
}

    

    

    

            

    

            



    
    






    
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