Package org.apache.cayenne.util

Class CompareToBuilder

java.lang.Object
org.apache.cayenne.util.CompareToBuilder
public class CompareToBuilder extends Object
Assists in implementing Comparable.compareTo(Object) methods. This code is based on CompareToBuilder from commons-lang v2.6
Since:
4.1

  • Constructor Details

    • CompareToBuilder

      public CompareToBuilder()

      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 toComparison() to get the result.

  • Method Details

    • appendSuper

      public CompareToBuilder appendSuper(int superCompareTo)

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

      Parameters:
      superCompareTo - result of calling super.compareTo(Object)
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(Object lhs, Object rhs)

      Appends to the builder the comparison of two Objects.

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

      lhs must either be an array or implement Comparable.

      Parameters:
      lhs - left-hand object
      rhs - right-hand object
      Returns:
      this - used to chain append calls
      Throws:
      ClassCastException - if rhs is not assignment-compatible with lhs

    • append

      public CompareToBuilder append(Object lhs, Object rhs, Comparator comparator)

      Appends to the builder the comparison of two Objects.

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

      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 Comparable instead.

      Parameters:
      lhs - left-hand object
      rhs - right-hand object
      comparator - Comparator used to compare the objects, null means treat lhs as Comparable
      Returns:
      this - used to chain append calls
      Throws:
      ClassCastException - if rhs is not assignment-compatible with lhs
      Since:
      2.0

    • append

      public CompareToBuilder append(long lhs, long rhs)
      Appends to the builder the comparison of two longs.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(int lhs, int rhs)
      Appends to the builder the comparison of two ints.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(short lhs, short rhs)
      Appends to the builder the comparison of two shorts.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(char lhs, char rhs)
      Appends to the builder the comparison of two chars.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(byte lhs, byte rhs)
      Appends to the builder the comparison of two bytes.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(double lhs, double rhs)

      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.

      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(float lhs, float rhs)

      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.

      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(boolean lhs, boolean rhs)
      Appends to the builder the comparison of two booleanss.
      Parameters:
      lhs - left-hand value
      rhs - right-hand value
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(Object[] lhs, Object[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a short length array is less than a long length array
      4. Check array contents element by element using append(Object, Object, Comparator)

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

      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls
      Throws:
      ClassCastException - if rhs is not assignment-compatible with lhs

    • append

      public CompareToBuilder append(Object[] lhs, Object[] rhs, Comparator comparator)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a short length array is less than a long length array
      4. Check array contents element by element using append(Object, Object, Comparator)

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

      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      comparator - Comparator to use to compare the array elements, null means to treat lhs elements as Comparable.
      Returns:
      this - used to chain append calls
      Throws:
      ClassCastException - if rhs is not assignment-compatible with lhs
      Since:
      2.0

    • append

      public CompareToBuilder append(long[] lhs, long[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(long, long)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(int[] lhs, int[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(int, int)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(short[] lhs, short[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(short, short)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(char[] lhs, char[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(char, char)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(byte[] lhs, byte[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(byte, byte)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(double[] lhs, double[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(double, double)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(float[] lhs, float[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(float, float)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • append

      public CompareToBuilder append(boolean[] lhs, boolean[] rhs)

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

      1. Check if arrays are the same using ==
      2. Check if for null, null is less than non-null
      3. Check array length, a shorter length array is less than a longer length array
      4. Check array contents element by element using append(boolean, boolean)
      Parameters:
      lhs - left-hand array
      rhs - right-hand array
      Returns:
      this - used to chain append calls

    • toComparison

      public int toComparison()
      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.
      Returns:
      final comparison result