Source Code Cross Referenced for SubstitutionTerm.java in  » Testing » KeY » de » uka » ilkd » key » logic » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » KeY » de.uka.ilkd.key.logic 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // This file is part of KeY - Integrated Deductive Software Design
02:        // Copyright (C) 2001-2007 Universitaet Karlsruhe, Germany
03:        //                         Universitaet Koblenz-Landau, Germany
04:        //                         Chalmers University of Technology, Sweden
05:        //
06:        // The KeY system is protected by the GNU General Public License. 
07:        // See LICENSE.TXT for details.
08:        //
09:        //
10:
11:        package de.uka.ilkd.key.logic;
12:
13:        import de.uka.ilkd.key.logic.op.ArrayOfQuantifiableVariable;
14:        import de.uka.ilkd.key.logic.op.Operator;
15:        import de.uka.ilkd.key.logic.op.QuantifiableVariable;
16:
17:        /**
18:         * A SubstitutionTerm is an object that contains an Operator two subterms. 
19:         * and one variable
20:         * Instances should never be accessed via 
21:         * this interface, use the interface of the superclass Term and construct 
22:         * instances only via
23:         * a TermFactory instead.
24:         */
25:        class SubstitutionTerm extends Term {
26:
27:            /** 
28:             * variable to substitute
29:             */
30:            private final ArrayOfQuantifiableVariable substVar;
31:
32:            /** 
33:             * The two sub terms of the substitution term, where subs[0] is the term
34:             * with which the variable is substituted and subs[1] is the term on
35:             * which the substitution is applied. 
36:             * <code> {x/subs[0]}subs[1]</code>
37:             */
38:            private final ArrayOfTerm subs;
39:
40:            /** depth of the term */
41:            private final int depth;
42:
43:            /** creates a substitution term
44:             * @param substVar the Variable to be substituted
45:             * @param substTerm the Term that replaces substVar
46:             * @param origTerm the Term that is substituted
47:             */
48:            public SubstitutionTerm(Operator op, QuantifiableVariable substVar,
49:                    Term[] subs) {
50:                super (op, op.sort(subs));
51:
52:                this .subs = new ArrayOfTerm(subs);
53:                this .substVar = new ArrayOfQuantifiableVariable(
54:                        new QuantifiableVariable[] { substVar });
55:                this .depth = 1 + (subs[0].depth() > subs[1].depth() ? subs[0]
56:                        .depth() : subs[1].depth());
57:
58:                fillCaches();
59:            }
60:
61:            /**
62:             * returns the <code>n-th</code> subterm  
63:             * @return n-th subterm ( e.g. {x s} t (0:s ,  1: t) 
64:             */
65:            public Term sub(int n) {
66:                return subs.getTerm(n);
67:            }
68:
69:            /**
70:             * returns the longest path from the root to the leaves
71:             * @return depth of the term 
72:             */
73:            public int depth() {
74:                return depth;
75:            }
76:
77:            /**
78:             * returns <code>2<code> as arity of a substitution term 
79:             * @return arity of the substitution term 1 as int 
80:             */
81:            public int arity() {
82:                return 2;
83:            }
84:
85:            /**
86:             * the substitution term bound the substituted variable in second 
87:             * (attention: i.e. <code>n=1<code>) subterm
88:             * @return the bound variables of the n-th subterm 
89:             */
90:            public ArrayOfQuantifiableVariable varsBoundHere(int n) {
91:                return (n == 0 ? EMPTY_VAR_LIST : substVar);
92:            }
93:
94:        }
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