Package de.danielbechler.diff.differ

Source Code of de.danielbechler.diff.differ.BeanDiffer

/*
* 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.access.PropertyAwareAccessor;
import de.danielbechler.diff.comparison.ComparisonStrategy;
import de.danielbechler.diff.comparison.ComparisonStrategyResolver;
import de.danielbechler.diff.filtering.IsReturnableResolver;
import de.danielbechler.diff.introspection.IsIntrospectableResolver;
import de.danielbechler.diff.instantiation.TypeInfo;
import de.danielbechler.diff.introspection.TypeInfoResolver;
import de.danielbechler.diff.node.DiffNode;
import de.danielbechler.util.Assert;

/**
* Used to find differences between objects that were not handled by one of the other (specialized) {@link
* Differ Differs}.
*
* @author Daniel Bechler
*/
public final class BeanDiffer implements Differ
{
  private final IsIntrospectableResolver isIntrospectableResolver;
  private final IsReturnableResolver isReturnableResolver;
  private final ComparisonStrategyResolver comparisonStrategyResolver;
  private final DifferDispatcher differDispatcher;
  private final TypeInfoResolver typeInfoResolver;

  public BeanDiffer(final DifferDispatcher differDispatcher,
            final IsIntrospectableResolver introspectableResolver,
            final IsReturnableResolver returnableResolver,
            final ComparisonStrategyResolver comparisonStrategyResolver,
            final TypeInfoResolver typeInfoResolver)
  {
    Assert.notNull(differDispatcher, "differDispatcher");
    this.differDispatcher = differDispatcher;

    Assert.notNull(introspectableResolver, "introspectableResolver");
    this.isIntrospectableResolver = introspectableResolver;

    Assert.notNull(returnableResolver, "returnableResolver");
    this.isReturnableResolver = returnableResolver;

    Assert.notNull(comparisonStrategyResolver, "comparisonStrategyResolver");
    this.comparisonStrategyResolver = comparisonStrategyResolver;

    Assert.notNull(typeInfoResolver, "typeInfoResolver");
    this.typeInfoResolver = typeInfoResolver;
  }

  public boolean accepts(final Class<?> type)
  {
    return !type.isPrimitive() && !type.isArray();
  }

  public final DiffNode compare(final DiffNode parentNode, final Instances instances)
  {
    final DiffNode beanNode = new DiffNode(parentNode, instances.getSourceAccessor(), instances.getType());
    if (instances.areNull() || instances.areSame())
    {
      beanNode.setState(DiffNode.State.UNTOUCHED);
    }
    else if (instances.hasBeenAdded())
    {
      compareUsingAppropriateMethod(beanNode, instances);
      beanNode.setState(DiffNode.State.ADDED);
    }
    else if (instances.hasBeenRemoved())
    {
      compareUsingAppropriateMethod(beanNode, instances);
      beanNode.setState(DiffNode.State.REMOVED);
    }
    else
    {
      compareUsingAppropriateMethod(beanNode, instances);
    }
    return beanNode;
  }

  private void compareUsingAppropriateMethod(final DiffNode beanNode, final Instances instances)
  {
    final ComparisonStrategy comparisonStrategy = comparisonStrategyResolver.resolveComparisonStrategy(beanNode);
    if (comparisonStrategy != null)
    {
      comparisonStrategy.compare(beanNode, instances.getType(), instances.getWorking(), instances.getBase());
    }
    else if (isIntrospectableResolver.isIntrospectable(beanNode))
    {
      compareUsingIntrospection(beanNode, instances);
    }
  }

  private void compareUsingIntrospection(final DiffNode beanNode, final Instances beanInstances)
  {
    final TypeInfo typeInfo = typeInfoResolver.typeInfoForNode(beanNode);
    beanNode.setValueTypeInfo(typeInfo);
    for (final PropertyAwareAccessor propertyAccessor : typeInfo.getAccessors())
    {
      final DiffNode propertyNode = differDispatcher.dispatch(beanNode, beanInstances, propertyAccessor);
      if (isReturnableResolver.isReturnable(propertyNode))
      {
        beanNode.addChild(propertyNode);
      }
    }
  }
}
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