Package de.danielbechler.diff.introspection

Source Code of de.danielbechler.diff.introspection.StandardIntrospector

/*
* 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.introspection;

import de.danielbechler.diff.access.PropertyAwareAccessor;
import de.danielbechler.diff.instantiation.TypeInfo;
import de.danielbechler.util.Assert;
import de.danielbechler.util.Exceptions;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

/**
* Resolves the accessors of a given type by using the standard Java {@link Introspector}.
*
* @author Daniel Bechler
*/
public class StandardIntrospector implements de.danielbechler.diff.introspection.Introspector
{
  public TypeInfo introspect(final Class<?> type)
  {
    Assert.notNull(type, "type");
    try
    {
      return internalIntrospect(type);
    }
    catch (final IntrospectionException e)
    {
      throw Exceptions.escalate(e);
    }
  }

  private TypeInfo internalIntrospect(final Class<?> type) throws IntrospectionException
  {
    final TypeInfo typeInfo = new TypeInfo(type);
    final PropertyDescriptor[] descriptors = getBeanInfo(type).getPropertyDescriptors();
    for (final PropertyDescriptor descriptor : descriptors)
    {
      if (shouldSkip(descriptor))
      {
        continue;
      }
      final String propertyName = descriptor.getName();
      final Method readMethod = descriptor.getReadMethod();
      final Method writeMethod = descriptor.getWriteMethod();
      final PropertyAwareAccessor accessor = new PropertyAccessor(propertyName, readMethod, writeMethod);
      typeInfo.addPropertyAccessor(accessor);
    }
    return typeInfo;
  }

  protected BeanInfo getBeanInfo(final Class<?> type) throws IntrospectionException
  {
    return Introspector.getBeanInfo(type);
  }

  private static boolean shouldSkip(final PropertyDescriptor descriptor)
  {
    if (descriptor.getName().equals("class")) // Java & Groovy
    {
      return true;
    }
    if (descriptor.getName().equals("metaClass")) // Groovy
    {
      return true;
    }
    if (descriptor.getReadMethod() == null)
    {
      return true;
    }
    return false;
  }
}
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