content: /* Alloy Analyzer 4 -- Copyright (c) 2006-2009, Felix Chang
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
   * (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
   * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
   * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  package edu.mit.csail.sdg.translator;
  
  import edu.mit.csail.sdg.ast.Sig.PrimSig;
  import edu.mit.csail.sdg.ast.Type;
  import kodkod.instance.Tuple;
  
  /**
   * Immutable; represents a single Alloy tuple; comparison is by identity rather
   * than by value.
   */
  
  public final class A4Tuple {
  
      /** The Kodkod tuple. */
      private final Tuple      tuple;
  
      /** The A4Solution that this came from. */
      private final A4Solution sol;
  
      /**
       * Construct a Tuple from the kodkod Tuple, while renaming each atom using the
       * atom2name map in sol. <br>
       * NOTE: caller must ensure the Kodkod tuple is not modified, since we expect
       * the resulting A4Tuple to be constant.
       */
      A4Tuple(Tuple tuple, A4Solution sol) {
          this.tuple = tuple;
          this.sol = sol;
      }
  
      /** Returns the arity. */
      public int arity() {
          return tuple.arity();
      }
  
      /**
       * Returns the type constructed by taking the product for each sig in this
       * tuple.
       */
      public Type type() {
          Type ans = null;
          for (int i = 0; i < tuple.arity(); i++)
              if (ans == null)
                  ans = sig(0).type();
              else
                  ans = ans.product(sig(i).type());
          return ans;
      }
  
      /** Returns the i-th atom in this Tuple. */
      public String atom(int i) {
          return sol.atom2name(tuple.atom(i));
      }
  
      /**
       * Return the most-specific-sig for the i-th atom in this Tuple.
       */
      public PrimSig sig(int i) {
          return sol.atom2sig(tuple.atom(i));
      }
  
      /** Prints a human-readable description of this Tuple. */
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          for (int i = 0; i < tuple.arity(); i++) {
              if (i > 0)
                  sb.append("->");
              sb.append(atom(i));
          }
          return sb.toString();
      }
  }
  