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/**
* Copyright (C) 2006-2014 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.phloc.commons.equals;
import java.io.File;
import java.math.BigDecimal;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import javax.annotation.Nonnull;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.phloc.commons.annotations.IsSPIImplementation;
import com.phloc.commons.io.file.FilenameHelper;
import com.phloc.commons.system.EJavaVersion;
/**
* This class registers the default equals implementations. The implementations
* in here should be aligned with the implementations in the
* {@link com.phloc.commons.hash.DefaultHashCodeImplementationRegistrarSPI}
*
* @author Philip Helger
*/
@IsSPIImplementation
public final class DefaultEqualsImplementationRegistrarSPI implements IEqualsImplementationRegistrarSPI
{
private static final class EqualsImplementationFile implements IEqualsImplementation
{
public boolean areEqual (@Nonnull final Object aObj1, @Nonnull final Object aObj2)
{
final File aFile1 = (File) aObj1;
final File aFile2 = (File) aObj2;
return FilenameHelper.getCleanPath (aFile1.getAbsoluteFile ())
.equals (FilenameHelper.getCleanPath (aFile2.getAbsoluteFile ()));
}
}
private static final class EqualsImplementationEnumeration implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Enumeration aRealObj1 = (Enumeration ) aObj1;
final Enumeration aRealObj2 = (Enumeration ) aObj2;
while (aRealObj1.hasMoreElements ())
{
if (!aRealObj2.hasMoreElements ())
{
// Second enumeration is shorter
return false;
}
final Object aChild1 = aRealObj1.nextElement ();
final Object aChild2 = aRealObj2.nextElement ();
if (!EqualsImplementationRegistry.areEqual (aChild1, aChild2))
return false;
}
if (aRealObj2.hasMoreElements ())
{
// Second enumeration is long
return false;
}
return true;
}
}
private static final class EqualsImplementationIterator implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Iterator aRealObj1 = (Iterator ) aObj1;
final Iterator aRealObj2 = (Iterator ) aObj2;
while (aRealObj1.hasNext ())
{
if (!aRealObj2.hasNext ())
{
// Second iterator is shorter
return false;
}
final Object aChild1 = aRealObj1.next ();
final Object aChild2 = aRealObj2.next ();
if (!EqualsImplementationRegistry.areEqual (aChild1, aChild2))
return false;
}
if (aRealObj2.hasNext ())
{
// Second iterator is longer
return false;
}
return true;
}
}
private static final class EqualsImplementationCollection implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Collection aRealObj1 = (Collection ) aObj1;
final Collection aRealObj2 = (Collection ) aObj2;
// Size check
if (aRealObj1.size () != aRealObj2.size ())
return false;
// Content check
final Object [] aData1 = aRealObj1.toArray ();
final Object [] aData2 = aRealObj2.toArray ();
return EqualsImplementationRegistry.areEqual (aData1, aData2);
}
}
private static final class EqualsImplementationMap implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Map aRealObj1 = (Map ) aObj1;
final Map aRealObj2 = (Map ) aObj2;
// Size check
if (aRealObj1.size () != aRealObj2.size ())
return false;
// Content check
for (final Map.Entry aEntry1 : aRealObj1.entrySet ())
{
final Object aKey1 = aEntry1.getKey ();
final Object aValue1 = aEntry1.getValue ();
if (aValue1 == null)
{
// Second map must also contain null value
if (!(aRealObj2.get (aKey1) == null && aRealObj2.containsKey (aKey1)))
return false;
}
else
{
// Check value
final Object aValue2 = aRealObj2.get (aKey1);
if (!EqualsImplementationRegistry.areEqual (aValue1, aValue2))
return false;
}
}
return true;
}
}
private static final class EqualsImplementationArrayShort implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((short []) aObj1, (short []) aObj2);
}
}
private static final class EqualsImplementationArrayLong implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((long []) aObj1, (long []) aObj2);
}
}
private static final class EqualsImplementationArrayInt implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((int []) aObj1, (int []) aObj2);
}
}
private static final class EqualsImplementationArrayFloat implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((float []) aObj1, (float []) aObj2);
}
}
private static final class EqualsImplementationArrayDouble implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((double []) aObj1, (double []) aObj2);
}
}
private static final class EqualsImplementationArrayChar implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((char []) aObj1, (char []) aObj2);
}
}
private static final class EqualsImplementationArrayByte implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((byte []) aObj1, (byte []) aObj2);
}
}
private static final class EqualsImplementationArrayBoolean implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return Arrays.equals ((boolean []) aObj1, (boolean []) aObj2);
}
}
private static final class EqualsImplementationAtomicLong implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final AtomicLong aRealObj1 = (AtomicLong) aObj1;
final AtomicLong aRealObj2 = (AtomicLong) aObj2;
return aRealObj1.get () == aRealObj2.get ();
}
}
private static final class EqualsImplementationAtomicInteger implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final AtomicInteger aRealObj1 = (AtomicInteger) aObj1;
final AtomicInteger aRealObj2 = (AtomicInteger) aObj2;
return aRealObj1.get () == aRealObj2.get ();
}
}
private static final class EqualsImplementationAtomicBoolean implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final AtomicBoolean aRealObj1 = (AtomicBoolean) aObj1;
final AtomicBoolean aRealObj2 = (AtomicBoolean) aObj2;
return aRealObj1.get () == aRealObj2.get ();
}
}
private static final class EqualsImplementationURL implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final URL aRealObj1 = (URL) aObj1;
final URL aRealObj2 = (URL) aObj2;
return aRealObj1.toExternalForm ().equals (aRealObj2.toExternalForm ());
}
}
private static final class EqualsImplementationNode implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Node aRealObj1 = (Node) aObj1;
final Node aRealObj2 = (Node) aObj2;
if (aRealObj1.getNodeType () != aRealObj2.getNodeType ())
return false;
if (!EqualsImplementationRegistry.areEqual (aRealObj1.getNodeName (), aRealObj2.getNodeName ()))
return false;
if (!EqualsImplementationRegistry.areEqual (aRealObj1.getLocalName (), aRealObj2.getLocalName ()))
return false;
if (!EqualsImplementationRegistry.areEqual (aRealObj1.getNamespaceURI (), aRealObj2.getNamespaceURI ()))
return false;
if (!EqualsImplementationRegistry.areEqual (aRealObj1.getPrefix (), aRealObj2.getPrefix ()))
return false;
if (!EqualsImplementationRegistry.areEqual (aRealObj1.getNodeValue (), aRealObj2.getNodeValue ()))
return false;
// For all children
final NodeList aNL1 = aRealObj1.getChildNodes ();
final NodeList aNL2 = aRealObj2.getChildNodes ();
final int nLength = aNL1.getLength ();
if (nLength != aNL2.getLength ())
return false;
for (int i = 0; i < nLength; ++i)
{
final Node aChild1 = aNL1.item (i);
final Node aChild2 = aNL2.item (i);
if (!EqualsImplementationRegistry.areEqual (aChild1, aChild2))
return false;
}
return true;
}
}
private static final class EqualsImplementationStringBuilder implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return aObj1.toString ().equals (aObj2.toString ());
}
}
private static final class EqualsImplementationStringBuffer implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
return aObj1.toString ().equals (aObj2.toString ());
}
}
private static final class EqualsImplementationFloat implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Float aRealObj1 = (Float) aObj1;
final Float aRealObj2 = (Float) aObj2;
return aRealObj1.compareTo (aRealObj2) == 0;
}
}
private static final class EqualsImplementationDouble implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Double aRealObj1 = (Double) aObj1;
final Double aRealObj2 = (Double) aObj2;
return aRealObj1.compareTo (aRealObj2) == 0;
}
}
private static final class EqualsImplementationBigDecimal implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final BigDecimal aRealObj1 = (BigDecimal) aObj1;
final BigDecimal aRealObj2 = (BigDecimal) aObj2;
// Compare is ~15% quicker than the setScale version
if (true)
return aRealObj1.compareTo (aRealObj2) == 0;
final int nMaxScale = Math.max (aRealObj1.scale (), aRealObj2.scale ());
return aRealObj1.setScale (nMaxScale).equals (aRealObj2.setScale (nMaxScale));
}
}
private static final class EqualsImplementationLocale implements IEqualsImplementation
{
public boolean areEqual (final Object aObj1, final Object aObj2)
{
final Locale aRealObj1 = (Locale) aObj1;
final Locale aRealObj2 = (Locale) aObj2;
return aRealObj1.toString ().equals (aRealObj2.toString ());
}
}
public void registerEqualsImplementations (@Nonnull final IEqualsImplementationRegistry aRegistry)
{
/**
* Special equals implementation for BigDecimal because
* BigDecimal.equals returns false if they have a
* different scale so that "5.5" is not equal "5.50".
*/
aRegistry.registerEqualsImplementation (BigDecimal.class, new EqualsImplementationBigDecimal ());
// Special overload for "Double" required!
aRegistry.registerEqualsImplementation (Double.class, new EqualsImplementationDouble ());
// Special overload for "Float" required!
aRegistry.registerEqualsImplementation (Float.class, new EqualsImplementationFloat ());
// StringBuffer does not implement equals!
aRegistry.registerEqualsImplementation (StringBuffer.class, new EqualsImplementationStringBuffer ());
// StringBuilder does not implement equals!
aRegistry.registerEqualsImplementation (StringBuilder.class, new EqualsImplementationStringBuilder ());
// Node does not implement equals
aRegistry.registerEqualsImplementation (Node.class, new EqualsImplementationNode ());
/**
* Special equals implementation for URLs because URL.equals
* performs a host lookup.
* Click here for details
*/
aRegistry.registerEqualsImplementation (URL.class, new EqualsImplementationURL ());
// AtomicBoolean does not implement equals!
aRegistry.registerEqualsImplementation (AtomicBoolean.class, new EqualsImplementationAtomicBoolean ());
// AtomicInteger does not implement equals!
aRegistry.registerEqualsImplementation (AtomicInteger.class, new EqualsImplementationAtomicInteger ());
// AtomicLong does not implement equals!
aRegistry.registerEqualsImplementation (AtomicLong.class, new EqualsImplementationAtomicLong ());
// Default array implementations
// (Object[].class is handled specially!)
aRegistry.registerEqualsImplementation (boolean [].class, new EqualsImplementationArrayBoolean ());
aRegistry.registerEqualsImplementation (byte [].class, new EqualsImplementationArrayByte ());
aRegistry.registerEqualsImplementation (char [].class, new EqualsImplementationArrayChar ());
aRegistry.registerEqualsImplementation (double [].class, new EqualsImplementationArrayDouble ());
aRegistry.registerEqualsImplementation (float [].class, new EqualsImplementationArrayFloat ());
aRegistry.registerEqualsImplementation (int [].class, new EqualsImplementationArrayInt ());
aRegistry.registerEqualsImplementation (long [].class, new EqualsImplementationArrayLong ());
aRegistry.registerEqualsImplementation (short [].class, new EqualsImplementationArrayShort ());
// Special handling for Map
aRegistry.registerEqualsImplementation (Map.class, new EqualsImplementationMap ());
// Special handling for Collection
aRegistry.registerEqualsImplementation (Collection.class, new EqualsImplementationCollection ());
// Special handling for Iterator
aRegistry.registerEqualsImplementation (Iterator.class, new EqualsImplementationIterator ());
// Special handling for Enumeration
aRegistry.registerEqualsImplementation (Enumeration.class, new EqualsImplementationEnumeration ());
// Special handling for File
aRegistry.registerEqualsImplementation (File.class, new EqualsImplementationFile ());
// Special handling for Locale in JDK >= 1.7
if (EJavaVersion.JDK_17.isSupportedVersion ())
aRegistry.registerEqualsImplementation (Locale.class, new EqualsImplementationLocale ());
}
}
