/* 
 * Created on Sep 9, 2005
 *
 * 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.
 *
 * Copyright @2005 the original author or authors.
 */
package org.springmodules.cache.provider;

import java.beans.PropertyEditor;
import java.beans.PropertyEditorSupport;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import org.springmodules.cache.CachingModel;
import org.springmodules.cache.util.SemicolonSeparatedPropertiesParser;

/**
 * <p>
 * Creates a new instance of <code>{@link CachingModel}</code> by parsing a
 * String of the form
 * <code>propertyName1=propertyValue1;propertyName2=propertyValue2;propertyNameN=propertyValueN</code>.
 * </p>
 * 
 * @author Alex Ruiz
 */
public class ReflectionCacheModelEditor extends PropertyEditorSupport {

  /**
   * The class of the <code>{@link CachingModel}</code> to create.
   */
  private Class cacheModelClass;

  /**
   * <code>PropertyEditor</code>s for the properties of the cache model to
   * create. Each <code>PropertyEditor</code> is stored using the name of the
   * property (a String) as key.
   */
  private Map cacheModelPropertyEditors;

  /**
   * @return the class of the caching model to create
   */
  public final Class getCacheModelClass() {
    return cacheModelClass;
  }

  /**
   * @return the <code>PropertyEditor</code>s for the properties of the cache
   *         model to create. Each <code>PropertyEditor</code> is stored using
   *         the name of the property (a String) as key
   */
  public final Map getCacheModelPropertyEditors() {
    return cacheModelPropertyEditors;
  }

  /**
   * @throws IllegalStateException
   *           if the class of the cache model to create has not been set.
   * @see SemicolonSeparatedPropertiesParser#parseProperties(String)
   * @see PropertyEditor#setAsText(String)
   * @see org.springframework.beans.PropertyAccessor#setPropertyValue(String,
   *      Object)
   */
  public final void setAsText(String text) {
    if (cacheModelClass == null) {
      throw new IllegalStateException("cacheModelClass should not be null");
    }

    Properties properties = SemicolonSeparatedPropertiesParser
        .parseProperties(text);

    BeanWrapper beanWrapper = new BeanWrapperImpl(cacheModelClass);

    if (properties != null) {
      for (Iterator i = properties.keySet().iterator(); i.hasNext();) {
        String propertyName = (String) i.next();
        String textProperty = properties.getProperty(propertyName);

        Object propertyValue = null;

        PropertyEditor propertyEditor = getPropertyEditor(propertyName);
        if (propertyEditor != null) {
          propertyEditor.setAsText(textProperty);
          propertyValue = propertyEditor.getValue();
        } else {
          propertyValue = textProperty;
        }
        beanWrapper.setPropertyValue(propertyName, propertyValue);
      }
    }

    setValue(beanWrapper.getWrappedInstance());
  }

  /**
   * Sets the class of the caching model to create
   * 
   * @param newCacheModelClass
   *          the new class
   */
  public final void setCacheModelClass(Class newCacheModelClass) {
    cacheModelClass = newCacheModelClass;
  }

  /**
   * Sets the <code>PropertyEditor</code>s for the properties of the cache
   * model to create. Each <code>PropertyEditor</code> is stored using the
   * name of the property (a String) as key.
   * 
   * @param newCacheModelPropertyEditors
   *          the new <code>PropertyEditor</code>s
   */
  public final void setCacheModelPropertyEditors(
      Map newCacheModelPropertyEditors) {
    cacheModelPropertyEditors = newCacheModelPropertyEditors;
  }

  private PropertyEditor getPropertyEditor(String propertyName) {
    return cacheModelPropertyEditors == null ? null
        : (PropertyEditor) cacheModelPropertyEditors.get(propertyName);
  }
}