001package Torello.Java.Additional; 002 003import java.lang.reflect.Field; 004 005/** 006 * This simple generic-class allows for storing <B STYLE='color:red'>two</B> objects with a 007 * single reference. 008 * 009 * <EMBED CLASS=globalDefs DATA-KIND=Tuple DATA-N=2> 010 * <EMBED CLASS='external-html' DATA-FILE-ID=MUTABLE_TUPLE> 011 * @param <A> The type of the <B STYLE='color:red'>first</B> member-field ('{@link #a}'). 012 * @param <B> The type of the <B STYLE='color:red'>second</B> member-field ('{@link #b}'). 013 */ 014public class Tuple2<A, B> 015 extends TupleN 016 implements java.io.Serializable, Cloneable 017{ 018 /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID> */ 019 protected static final long serialVersionUID = 1; 020 021 /** This holds a pointer the first field / instance. */ 022 public A a; 023 024 /** This holds a pointer to the second field / instance. */ 025 public B b; 026 027 /** Constructs this object */ 028 public Tuple2(A a, B b) 029 { 030 this.a = a; 031 this.b = b; 032 } 033 034 /** Constructs this object. Initializes both fields to null. */ 035 public Tuple2() 036 { 037 this.a = null; 038 this.b = null; 039 } 040 041 /** 042 * Returns {@code '2'}, indicating how many fields are declared by this class. 043 * @return As an instance of {@code Tuple1}, this method returns {@code '2'}; 044 */ 045 public int n() { return 2; } 046 047 // Super-class uses this for toString, equals, and hashCode 048 // There is an optimization, so if this is requested multiple times, it is saved in a 049 // transient field. 050 051 final Object[] asArrayInternal() 052 { return new Object[] { a, b }; } 053 054 public Tuple2<A, B> clone() 055 { return new Tuple2<>(this.a, this.b); } 056 057 /** 058 * <EMBED CLASS=defs DATA-TEXT="Integer"> 059 * <EMBED CLASS='external-html' DATA-FILE-ID=MULTI_TYPE_EX_COMMON> 060 * <EMBED CLASS='external-html' DATA-FILE-ID=MULTI_TYPE_GET_EXAMPLE> 061 */ 062 public Object get(final int i) 063 { 064 // Throws Exception if i not 1 or 2 065 CHECK_GET(i); 066 return (i == 1) ? a : b; 067 } 068 069 public Ret2<A, B> toImmutable() 070 { return new Ret2<>(this.a, this.b); } 071}