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/*******************************************************************************
* Copyright (c) 2009, 2010 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.analysis;
import org.jacoco.core.analysis.ICounter;
/**
* {@link ICounter} implementations. Implementing a factory pattern allows to
* share counter instances.
*
* @author Marc R. Hoffmann
* @version $qualified.bundle.version$
*/
public abstract class CounterImpl implements ICounter {
/** Max counter value for which singletons are created */
private static final int SINGLETON_LIMIT = 30;
private static final CounterImpl[][] SINGLETONS = new CounterImpl[SINGLETON_LIMIT + 1][];
static {
for (int i = 0; i <= SINGLETON_LIMIT; i++) {
SINGLETONS[i] = new CounterImpl[SINGLETON_LIMIT + 1];
for (int j = 0; j <= SINGLETON_LIMIT; j++) {
SINGLETONS[i][j] = new Fix(i, j);
}
}
}
/** Constant for Counter with 0/0 values. */
public static final CounterImpl COUNTER_0_0 = SINGLETONS[0][0];
/** Constant for Counter with 1/0 values. */
public static final CounterImpl COUNTER_1_0 = SINGLETONS[1][0];
/** Constant for Counter with 0/1 values. */
public static final CounterImpl COUNTER_0_1 = SINGLETONS[0][1];
/**
* Mutable version of the counter.
*/
private static class Var extends CounterImpl {
public Var(final int missed, final int covered) {
super(missed, covered);
}
@Override
public CounterImpl increment(final int missed, final int covered) {
this.missed += missed;
this.covered += covered;
return this;
}
}
/**
* Immutable version of the counter.
*/
private static class Fix extends CounterImpl {
public Fix(final int missed, final int covered) {
super(missed, covered);
}
@Override
public CounterImpl increment(final int missed, final int covered) {
return getInstance(this.missed + missed, this.covered + covered);
}
}
/**
* Factory method to retrieve a counter with the given number of items.
*
* @param missed
* number of missed items
* @param covered
* number of covered items
* @return counter instance
*/
public static CounterImpl getInstance(final int missed, final int covered) {
if (missed <= SINGLETON_LIMIT && covered <= SINGLETON_LIMIT) {
return SINGLETONS[missed][covered];
} else {
return new Var(missed, covered);
}
}
/**
* Factory method to retrieve a clone of the given counter.
*
* @param counter
* counter to copy
* @return counter instance
*/
public static CounterImpl getInstance(final ICounter counter) {
return getInstance(counter.getMissedCount(), counter.getCoveredCount());
}
/** number of missed items */
protected int missed;
/** number of covered items */
protected int covered;
/**
* Creates a new instance with the given numbers.
*
* @param missed
* number of missed items
* @param covered
* number of covered items
*/
protected CounterImpl(final int missed, final int covered) {
this.missed = missed;
this.covered = covered;
}
/**
* Returns a counter with values incremented by the numbers of the given
* counter. It is up to the implementation whether this counter instance is
* modified or a new instance is returned.
*
* @param counter
* number of additional total and covered items
* @return counter instance with incremented values
*/
public CounterImpl increment(final ICounter counter) {
return increment(counter.getMissedCount(), counter.getCoveredCount());
}
/**
* Returns a counter with values incremented by the given numbers. It is up
* to the implementation whether this counter instance is modified or a new
* instance is returned.
*
* @param missed
* number of missed items
* @param covered
* number of covered items
* @return counter instance with incremented values
*/
public abstract CounterImpl increment(int missed, int covered);
// === ICounter implementation ===
public int getTotalCount() {
return missed + covered;
}
public int getCoveredCount() {
return covered;
}
public int getMissedCount() {
return missed;
}
public double getCoveredRatio() {
return (double) covered / (missed + covered);
}
public double getMissedRatio() {
return (double) missed / (missed + covered);
}
@Override
public boolean equals(final Object obj) {
if (obj instanceof ICounter) {
final ICounter that = (ICounter) obj;
return this.missed == that.getMissedCount()
&& this.covered == that.getCoveredCount();
} else {
return false;
}
}
@Override
public int hashCode() {
return missed ^ covered * 17;
}
@Override
public String toString() {
final StringBuilder b = new StringBuilder("Counter["); //$NON-NLS-1$
b.append(getMissedCount());
b.append('/').append(getCoveredCount());
b.append(']');
return b.toString();
}
}
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