/*
* Copyright 2014 Daniel Bechler
*
* 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 de.danielbechler.diff.differ;
import de.danielbechler.diff.access.Instances;
import de.danielbechler.diff.comparison.PrimitiveDefaultValueModeResolver;
import de.danielbechler.diff.node.DiffNode;
import de.danielbechler.util.Classes;
import static de.danielbechler.diff.comparison.PrimitiveDefaultValueMode.UNASSIGNED;
/**
* @author Daniel Bechler
*/
public final class PrimitiveDiffer implements Differ
{
private final PrimitiveDefaultValueModeResolver primitiveDefaultValueModeResolver;
public PrimitiveDiffer(final PrimitiveDefaultValueModeResolver primitiveDefaultValueModeResolver)
{
this.primitiveDefaultValueModeResolver = primitiveDefaultValueModeResolver;
}
public boolean accepts(final Class<?> type)
{
return Classes.isPrimitiveType(type);
}
public final DiffNode compare(final DiffNode parentNode, final Instances instances)
{
if (!instances.getType().isPrimitive())
{
throw new IllegalArgumentException("The primitive differ can only deal with primitive types.");
}
final DiffNode node = new DiffNode(parentNode, instances.getSourceAccessor(), instances.getType());
if (shouldTreatPrimitiveDefaultsAsUnassigned(node) && instances.hasBeenAdded())
{
node.setState(DiffNode.State.ADDED);
}
else if (shouldTreatPrimitiveDefaultsAsUnassigned(node) && instances.hasBeenRemoved())
{
node.setState(DiffNode.State.REMOVED);
}
else if (!instances.areEqual())
{
node.setState(DiffNode.State.CHANGED);
}
return node;
}
private boolean shouldTreatPrimitiveDefaultsAsUnassigned(final DiffNode node)
{
return primitiveDefaultValueModeResolver.resolvePrimitiveDefaultValueMode(node) == UNASSIGNED;
}
}