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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2015, Red Hat, Inc., and individual contributors as indicated
 * by the @authors tag.
 *
 * 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 org.jboss.util.propertyeditor;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;

import org.jboss.util.NestedRuntimeException;
import org.jboss.util.StringPropertyReplacer;

/**
 * A property editor for {@link java.util.Properties}.
 *
 * @author Jason Dillon
 * @author [email protected]
 * @version $Revision$
 */
@SuppressWarnings("unchecked")
public class PropertiesEditor extends TextPropertyEditorSupport
{
   /**
    * Returns a Properties object initialized with current getAsText value
    * interpretted as a .properties file contents. This replaces any
    * references of the form ${x} with the corresponding system property. 
    *
    * @return a Properties object
    *
    * @throws NestedRuntimeException  An IOException occured.
    */
   public Object getValue()
   {
      try
      {
         // Load the current key=value properties into a Properties object
         String propsText = getAsText();
         Properties rawProps = new Properties(System.getProperties());
         ByteArrayInputStream bais = new ByteArrayInputStream(propsText.getBytes());
         rawProps.load(bais);
         // Now go through the rawProps and replace any ${x} refs
         Properties props = new Properties();
         Iterator keys = rawProps.keySet().iterator();
         while( keys.hasNext() )
         {
            String key = (String) keys.next();
            String value = rawProps.getProperty(key);
            String value2 = StringPropertyReplacer.replaceProperties(value, rawProps);
            props.setProperty(key, value2);
         }
         rawProps.clear();

         return props;
      }
      catch (IOException e)
      {
         throw new NestedRuntimeException(e);
      }
   }
}