/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.uima.application.metadata.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.uima.UIMA_IllegalArgumentException;
import org.apache.uima.resource.metadata.ConfigurationParameterSettings;
import org.apache.uima.resource.metadata.NameValuePair;
import org.apache.uima.resource.metadata.impl.MetaDataObject_impl;
import org.apache.uima.resource.metadata.impl.NameValuePair_impl;
import org.apache.uima.resource.metadata.impl.PropertyXmlInfo;
import org.apache.uima.resource.metadata.impl.XmlizationInfo;
import org.apache.uima.util.InvalidXMLException;
import org.apache.uima.util.NameClassPair;
import org.apache.uima.util.XMLParser;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 * Reference implementation of {@link ConfigurationParameterSettings}.
 * 
 * 
 *   <binding element="configurationParameterSettings" 
 *      interface="org.apache.uima.resource.metadata.ConfigurationParameterSettings" 
 *      class="org.apache.uima.resource.metadata.impl.ConfigurationParameterSettings_impl" /> 
 * 
 */
public class ConfigParamSettings_impl extends MetaDataObject_impl
                 // implements ConfigurationParameterSettings
{
  
  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#getParameterSettings()
   */
  public NameValuePair[] getParameterSettings()
  {
    return mParameterSettings;
  }

  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#setParameterSettings(org.apache.uima.resource.NameValuePair[])
   */
  public void setParameterSettings(NameValuePair[] aSettings)
  {
    if (aSettings == null)
    {
      throw new UIMA_IllegalArgumentException(
          UIMA_IllegalArgumentException.ILLEGAL_ARGUMENT,
          new Object[]{"null", "aSettings", "setParameterSettings"});            
    }    
    mParameterSettings = aSettings;
  }

  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#getSettingsForGroups()
   */
  public Map getSettingsForGroups()
  {
    return mSettingsForGroups;
  }


  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#getParameterValue(java.lang.String)
   */
  public Object getParameterValue(String aParamName)
  {
    NameValuePair[] nvps = getParameterSettings();
    if (nvps != null)
    {
      for (int i = 0; i < nvps.length; i++)
      {
        if (aParamName.equals(nvps[i].getName()))
        {
          return nvps[i].getValue();
        }
      }
    }
    return null;
  }

  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#getParameterValue(java.lang.String, java.lang.String)
   */
  public Object getParameterValue(String aGroupName, String aParamName)
  {
    if (aGroupName == null)
    {
      return getParameterValue(aParamName);
    }
    else
    {    
      NameValuePair[] nvps = (NameValuePair[])mSettingsForGroups.get(aGroupName);
      if (nvps != null)
      {
        for (int i = 0; i < nvps.length; i++)
        {
          if (aParamName.equals(nvps[i].getName()))
          {
            return nvps[i].getValue();
          }
        }      
      }
      return null;
    }  
  }

  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#setParameterValue(java.lang.String, java.lang.Object)
   */
  public void setParameterValue(String aParamName, Object aValue)
  {   
    if (aValue != null) //setting a value
    {     
      NameValuePair[] nvps = getParameterSettings();
      if (nvps != null)
      {
        for (int i = 0; i < nvps.length; i++)
        {
          if (aParamName.equals(nvps[i].getName()))
          {
            nvps[i].setValue(aValue);
            return;
          }
        }
    
        //param not found - add new NameValuePair
        NameValuePair newNVP = new NameValuePair_impl(aParamName,aValue);
        NameValuePair[] newArr = new NameValuePair[nvps.length + 1];
        System.arraycopy(nvps,0,newArr,0,nvps.length);
        newArr[newArr.length - 1] = newNVP;
        setParameterSettings(newArr);
      }
      else
      {
        setParameterSettings(
          new NameValuePair[]{new NameValuePair_impl(aParamName,aValue)});
      }
    }  
    else //clearing a value
    {
      NameValuePair[] nvps = getParameterSettings();
      if (nvps != null)
      {
        for (int i = 0; i < nvps.length; i++)
        {
          if (aParamName.equals(nvps[i].getName()))
          {
            NameValuePair[] newArr = new NameValuePair[nvps.length - 1];
            System.arraycopy(nvps,0,newArr,0,i);
            System.arraycopy(nvps,i+1,newArr,i,nvps.length-i-1);
            setParameterSettings(newArr);
            break;
          }
        }
    
      }
    }    
  }

  /**
   * @see org.apache.uima.resource.ConfigurationParameterSettings#setParameterValue(java.lang.String, java.lang.String, java.lang.Object)
   */
  public void setParameterValue(String aGroupName, String aParamName,
    Object aValue)
  {
    if (aGroupName == null)
    {
      setParameterValue(aParamName, aValue);
    }
    else
    {    
      if (aValue != null) //setting a value
      {     
        NameValuePair[] nvps = (NameValuePair[])mSettingsForGroups.get(aGroupName);
        if (nvps ==  null) //create new group
        {
          NameValuePair newNVP = new NameValuePair_impl(aParamName,aValue);
          mSettingsForGroups.put(aGroupName,new NameValuePair[]{newNVP});
        }
        else    
        {
          for (int i = 0; i < nvps.length; i++)
          {
            if (aParamName.equals(nvps[i].getName()))
            {
              nvps[i].setValue(aValue);
              return;
            }
          }      
          //param not found - add new NameValuePair to group
          NameValuePair newNVP = new NameValuePair_impl(aParamName,aValue);
          NameValuePair[] newArr = new NameValuePair[nvps.length + 1];
          System.arraycopy(nvps,0,newArr,0,nvps.length);
          newArr[newArr.length - 1] = newNVP;
          mSettingsForGroups.put(aGroupName,newArr);
        }
      }  
      else //clearing a value
      {
        NameValuePair[] nvps = (NameValuePair[])mSettingsForGroups.get(aGroupName);
        if (nvps != null)
        {
          for (int i = 0; i < nvps.length; i++)
          {
            if (aParamName.equals(nvps[i].getName()))
            {
              NameValuePair[] newArr = new NameValuePair[nvps.length - 1];
              System.arraycopy(nvps,0,newArr,0,i);
              System.arraycopy(nvps,i+1,newArr,i,nvps.length-i-1);
              mSettingsForGroups.put(aGroupName,newArr);
              break;
            }
          }    
        }
      }    
    }
  }

  /**
   * @see org.apache.uima.resource.impl.MetaDataObject_impl#getXmlizationInfo()
   */
  protected XmlizationInfo getXmlizationInfo()
  {
    return XMLIZATION_INFO;
  }

  /**
   * Overridden to add the settingsForGroups property to the result list.  
   * Default introspection implementation won't return it because it has no set 
   * method.  We've also overridden the XML import/export methods, though, so 
   * that set methods are not required.
   * 
   * @see org.apache.uima.resource.MetaDataObject#listAttributes()
   */
  public List listAttributes()
  {
    List result = super.listAttributes();
    result.add(new NameClassPair("settingsForGroups",
                                 Map.class.getName()));
    return result;
  }
 

  /**
   * Overridden becuase of settingsForGroups property, which is a Map and isn't
   * handled by default XMLization routines.
   * @see org.apache.uima.util.XMLizable#buildFromXMLElement(org.w3c.dom.Element, org.apache.uima.util.XMLParser)
   */
  public void buildFromXMLElement(Element aElement, XMLParser aParser, XMLParser.ParsingOptions aOptions)
    throws InvalidXMLException
  {
    ArrayList nvps = new ArrayList();
    //get all child nodes
    NodeList childNodes = aElement.getChildNodes();
    for (int i = 0; i <childNodes.getLength(); i++)
    {
      Node curNode = childNodes.item(i);
      if (curNode instanceof Element)
      {
        Element elem = (Element)curNode;
        //check element tag name
        if ("nameValuePair".equals(elem.getTagName()))
        {
          nvps.add(aParser.buildObject(elem,aOptions));  
        }
        else if ("settingsForGroup".equals(elem.getTagName()))
        {
          String key = elem.getAttribute("name");

          ArrayList vals = new ArrayList();
          NodeList arrayNodes = elem.getChildNodes();
          for (int j = 0; j <arrayNodes.getLength(); j++)
          {
            Node curArrayNode = arrayNodes.item(j);
            if (curArrayNode instanceof Element)
            {
              Element valElem = (Element)curArrayNode;
              vals.add(aParser.buildObject(valElem));
            }
          }
          if (!vals.isEmpty())
          {
            NameValuePair[] valArr = new NameValuePair[vals.size()];
            vals.toArray(valArr);
            mSettingsForGroups.put(key, valArr);
          }                
        }
        else
        {
          throw new InvalidXMLException(
              InvalidXMLException.UNKNOWN_ELEMENT,
              new Object[]{elem.getTagName()});
        }
      }  
    }
    NameValuePair[] nvpArr = new NameValuePair[nvps.size()];
    nvps.toArray(nvpArr);
    setParameterSettings(nvpArr);      
    
  }


  /**
   * Overridden to write the settingsForGroups property, whose value is a
   * Map, which is not supported by the default XMLization routines.
   * @see org.apache.uima.resource.impl.MetaDataObject_impl#writePropertyAsElement(org.apache.uima.resource.impl.PropertyXmlInfo, java.lang.String, ContentHandler)
   */
  protected void writePropertyAsElement(PropertyXmlInfo aPropInfo,
    String aNamespace, ContentHandler aContentHandler)
    throws SAXException
  {
    if ("settingsForGroups".equals(aPropInfo.propertyName))
    {
      this.writeMapPropertyToXml("settingsForGroups",null,"name",
            "settingsForGroup",true,aNamespace,aContentHandler);     
    }
    else
    {
      super.writePropertyAsElement(aPropInfo, aNamespace, aContentHandler);
    }  
  }
  
  
  static final private XmlizationInfo XMLIZATION_INFO =
    new XmlizationInfo("configurationParameterSettings",
      new PropertyXmlInfo[]{
         new PropertyXmlInfo("parameterSettings",null),
         new PropertyXmlInfo("settingsForGroups",null) //NOTE: custom XMLization
      });  
      
 /**
  * Settings for parameters that are not in any group.
  */
  private NameValuePair[] mParameterSettings = new NameValuePair[0];
  
  /**
   * Settings for parameters in groups.  This HashMap has
   * <code>String</code> keys (the group name) and <code>NameValuePair[]</code> 
   * values (the parmeter names and their values).
   */
  private Map mSettingsForGroups = new HashMap();
  
  static final long serialVersionUID = 3476535733588304983L;
}