/*
* Kodkod -- Copyright (c) 2005-present, Emina Torlak
*
* 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 kodkod.engine;
import kodkod.engine.fol2sat.Translation;
/**
* Stores the statistics gathered while solving
* a given formula.
* @specfield formula: Formula // the formula being solved
* @specfield bounds: Bounds // the bounds on the formula
*/
public final class Statistics {
private static final String NEW_LINE = System.getProperty("line.separator");
private final int vars, pVars, clauses;
private final long translation, solving;
/**
* Constructs a new Statistics object using the provided values.
*/
Statistics(int primaryVariables, int variables, int clauses,
long translationTime, long solvingTime) {
this.pVars = primaryVariables;
this.vars = variables;
this.clauses = clauses;
this.translation = translationTime;
this.solving = solvingTime;
}
/**
* Constructs a new Statistics object using the provided values.
*/
Statistics(Translation translation, long translationTime, long solvingTime) {
this(translation.numPrimaryVariables(), translation.cnf().numberOfVariables(),
translation.cnf().numberOfClauses(), translationTime, solvingTime);
}
/**
* Returns the number of variables needed
* to encode this.formula in CNF.
* @return the number of variables needed
* to encode this.formula in CNF.
*/
public int variables() {
return vars;
}
/**
* Returns the number of primary variables
* used in the encoding of this.formula; i.e. the variables
* allocated to all the relations at the leaves
* of this.formula.
* @return the number of primary variables
* used in the encoding of this.formula
*/
public int primaryVariables() {
return pVars;
}
/**
* Returns the number of clauses needed to
* encode this.formula in CNF.
* @return the number of variables needed
* to encode this.formula in CNF.
*/
public int clauses() {
return clauses;
}
/**
* Returns the number of miliseconds spent
* on translation this.formula to CNF.
* @return the number of miliseconds spent
* on translation this.formula to CNF.
*/
public long translationTime() {
return translation;
}
/**
* Returns the number of miliseconds spent
* on solving the CNF encoding of this.formula.
* @return the number of miliseconds spent
* on solving the CNF encoding of this.formula.
*/
public long solvingTime() {
return solving;
}
/**
* Returns a string representation of this
* Statistics object.
* @return a string representation of this
* Statistics object.
*/
public String toString() {
final StringBuilder ret = new StringBuilder();
ret.append("p cnf ");
ret.append(vars);
ret.append(" ");
ret.append(clauses);
ret.append(NEW_LINE);
ret.append("primary variables: ");
ret.append(pVars);
ret.append(NEW_LINE);
ret.append("translation time: ");
ret.append(translation);
ret.append(" ms").append(NEW_LINE);
ret.append("solving time: ");
ret.append(solving);
ret.append(" ms");
return ret.toString();
}
}