/**
* OpenSpotLight - Open Source IT Governance Platform
*
* Copyright (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA
* or third-party contributors as indicated by the @author tags or express
* copyright attribution statements applied by the authors. All third-party
* contributions are distributed under license by CARAVELATECH CONSULTORIA E
* TECNOLOGIA EM INFORMATICA LTDA.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
***********************************************************************
* OpenSpotLight - Plataforma de Governança de TI de Código Aberto
*
* Direitos Autorais Reservados (c) 2009, CARAVELATECH CONSULTORIA E TECNOLOGIA
* EM INFORMATICA LTDA ou como contribuidores terceiros indicados pela etiqueta
* @author ou por expressa atribuição de direito autoral declarada e atribuída pelo autor.
* Todas as contribuições de terceiros estão distribuídas sob licença da
* CARAVELATECH CONSULTORIA E TECNOLOGIA EM INFORMATICA LTDA.
*
* Este programa é software livre; você pode redistribuí-lo e/ou modificá-lo sob os
* termos da Licença Pública Geral Menor do GNU conforme publicada pela Free Software
* Foundation.
*
* Este programa é distribuído na expectativa de que seja útil, porém, SEM NENHUMA
* GARANTIA; nem mesmo a garantia implícita de COMERCIABILIDADE OU ADEQUAÇÃO A UMA
* FINALIDADE ESPECÍFICA. Consulte a Licença Pública Geral Menor do GNU para mais detalhes.
*
* Você deve ter recebido uma cópia da Licença Pública Geral Menor do GNU junto com este
* programa; se não, escreva para:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.openspotlight.common.util;
import static org.openspotlight.common.util.Assertions.checkCondition;
import static org.openspotlight.common.util.Exceptions.logAndThrow;
import java.lang.reflect.Field;
import java.util.Arrays;
import org.openspotlight.common.exception.SLRuntimeException;
/**
* Helper class to build equals methods in a secure and concise way.
*
* @author Luiz Fernando Teston - feu.teston@caravelatech.com
* @author Vitor Hugo Chagas
*/
public class Equals {
/**
* Should not be instantiated.
*/
private Equals() {
logAndThrow(new IllegalStateException(Messages.getString("invalidConstructor"))); //$NON-NLS-1$
}
public static boolean eachEquality(final boolean of,
final boolean andOf) {
return of == andOf;
}
public static boolean eachEquality(final boolean[] of,
final boolean[] andOf) {
return Arrays.equals(of, andOf);
}
public static boolean eachEquality(final byte of,
final byte andOf) {
return of == andOf;
}
public static boolean eachEquality(final byte[] of,
final byte[] andOf) {
return Arrays.equals(of, andOf);
}
public static boolean eachEquality(final char of,
final char andOf) {
return of == andOf;
}
/**
* Each equality.
*
* @param <T> Type of item been comparated
* @param thisObjectType the this object type
* @param thisObject the this object
* @param thatObject the that object
* @param fieldName the field name
* @return true, if successful
*/
public static <T> boolean eachEquality(final Class<T> thisObjectType,
final T thisObject,
final Object thatObject,
final String fieldName) {
boolean status = false;
Assertions.checkNotNull("this object type", thisObjectType);
Assertions.checkNotNull("this object", thisObject);
if (thatObject != null && thisObjectType.isInstance(thatObject)) {
Field field = null;
try {
try {
field = thisObjectType.getDeclaredField(fieldName);
} catch (final NoSuchFieldException e) {}
if (field == null) {
field = thisObjectType.getDeclaredField(fieldName);
}
field.setAccessible(true);
final Object value1 = field.get(thisObject);
final Object value2 = field.get(thatObject);
status = value1 == value2 || value1.equals(value2);
} catch (final Exception e) {
throw new SLRuntimeException("Error on attempt to perform " + thisObjectType.getName() + " equality operation.",
e);
} finally {
if (field != null) {
field.setAccessible(false);
}
}
}
return status;
}
public static boolean eachEquality(final double of,
final double andOf) {
return of == andOf;
}
public static boolean eachEquality(final double[] of,
final double[] andOf) {
return Arrays.equals(of, andOf);
}
public static boolean eachEquality(final float of,
final float andOf) {
return of == andOf;
}
public static boolean eachEquality(final float[] of,
final float[] andOf) {
return Arrays.equals(of, andOf);
}
public static boolean eachEquality(final int of,
final int andOf) {
return of == andOf;
}
public static boolean eachEquality(final int[] of,
final int[] andOf) {
return Arrays.equals(of, andOf);
}
public static boolean eachEquality(final long of,
final long andOf) {
return of == andOf;
}
public static boolean eachEquality(final long[] of,
final long[] andOf) {
return Arrays.equals(of, andOf);
}
/**
* Method that call equals in a null pointer safe way.
*
* @param o1 the o1
* @param o2 the o2
* @return true if the two object are equal
*/
public static boolean eachEquality(final Object o1,
final Object o2) {
if (o1 == o2) { return true; }
if (o1 == null && o2 != null) { return false; }
if (o2 == null && o1 != null) { return false; }
return o1 != null && o1.equals(o2);
}
/**
* Equals method to be used like this:
*
* <pre>
* import static org.openspotlight.common.util.Arrays.of;
* import static org.openspotlight.common.util.Arrays.andOf;
* import static org.openspotlight.common.util.Equals.equals;
* //...
* public void equals(Object o){
* if(o==this)
* return true;
* if(!(o instanceof ThisClass))
* return false;
* ThisClass that = (ThisClass) o;
* return eachEquality(of(this.attribute1,this.attribute2)
* ,andOf(that.attribute1,that.attribute2));
* }
*
* </pre>
*
* @param of the of
* @param andOf the and of
* @return true if all objects are equal
*/
public static boolean eachEquality(final Object[] of,
final Object[] andOf) {
if (of == null) {
if (andOf == null) { return true; }
return false;
}
checkCondition("sameSize", (of.length == andOf.length)); //$NON-NLS-1$
final int size = of.length;
for (int i = 0; i < size; i++) {
if (!eachEquality(of[i], andOf[i])) { return false; }
}
return true;
}
public static boolean eachEquality(final short of,
final short andOf) {
return of == andOf;
}
}