/*******************************************************************************
* Copyright (c) 2009, 2014 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;
import org.jacoco.core.analysis.ILine;
/**
* Implementation of {@link ILine}.
*/
public abstract class LineImpl implements ILine {
/** Max instruction counter value for which singletons are created */
private static final int SINGLETON_INS_LIMIT = 8;
/** Max branch counter value for which singletons are created */
private static final int SINGLETON_BRA_LIMIT = 4;
private static final LineImpl[][][][] SINGLETONS = new LineImpl[SINGLETON_INS_LIMIT + 1][][][];
static {
for (int i = 0; i <= SINGLETON_INS_LIMIT; i++) {
SINGLETONS[i] = new LineImpl[SINGLETON_INS_LIMIT + 1][][];
for (int j = 0; j <= SINGLETON_INS_LIMIT; j++) {
SINGLETONS[i][j] = new LineImpl[SINGLETON_BRA_LIMIT + 1][];
for (int k = 0; k <= SINGLETON_BRA_LIMIT; k++) {
SINGLETONS[i][j][k] = new LineImpl[SINGLETON_BRA_LIMIT + 1];
for (int l = 0; l <= SINGLETON_BRA_LIMIT; l++) {
SINGLETONS[i][j][k][l] = new Fix(i, j, k, l);
}
}
}
}
}
/**
* Empty line without instructions or branches.
*/
public static final LineImpl EMPTY = SINGLETONS[0][0][0][0];
private static LineImpl getInstance(final CounterImpl instructions,
final CounterImpl branches) {
final int im = instructions.getMissedCount();
final int ic = instructions.getCoveredCount();
final int bm = branches.getMissedCount();
final int bc = branches.getCoveredCount();
if (im <= SINGLETON_INS_LIMIT && ic <= SINGLETON_INS_LIMIT
&& bm <= SINGLETON_BRA_LIMIT && bc <= SINGLETON_BRA_LIMIT) {
return SINGLETONS[im][ic][bm][bc];
}
return new Var(instructions, branches);
}
/**
* Mutable version.
*/
private static final class Var extends LineImpl {
Var(final CounterImpl instructions, final CounterImpl branches) {
super(instructions, branches);
}
@Override
public LineImpl increment(final ICounter instructions,
final ICounter branches) {
this.instructions = this.instructions.increment(instructions);
this.branches = this.branches.increment(branches);
return this;
}
}
/**
* Immutable version.
*/
private static final class Fix extends LineImpl {
public Fix(final int im, final int ic, final int bm, final int bc) {
super(CounterImpl.getInstance(im, ic), CounterImpl.getInstance(bm,
bc));
}
@Override
public LineImpl increment(final ICounter instructions,
final ICounter branches) {
return getInstance(this.instructions.increment(instructions),
this.branches.increment(branches));
}
}
/** instruction counter */
protected CounterImpl instructions;
/** branch counter */
protected CounterImpl branches;
private LineImpl(final CounterImpl instructions, final CounterImpl branches) {
this.instructions = instructions;
this.branches = branches;
}
/**
* Adds the given counters to this line.
*
* @param instructions
* instructions to add
* @param branches
* branches to add
* @return instance with new counter values
*/
public abstract LineImpl increment(final ICounter instructions,
final ICounter branches);
// === ILine implementation ===
public int getStatus() {
return instructions.getStatus() | branches.getStatus();
}
public ICounter getInstructionCounter() {
return instructions;
}
public ICounter getBranchCounter() {
return branches;
}
@Override
public int hashCode() {
return 23 * instructions.hashCode() ^ branches.hashCode();
}
@Override
public boolean equals(final Object obj) {
if (obj instanceof ILine) {
final ILine that = (ILine) obj;
return this.instructions.equals(that.getInstructionCounter())
&& this.branches.equals(that.getBranchCounter());
}
return false;
}
}