/*******************************************************************************
    * Copyright (c) 2015 LegSem.
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the GNU Lesser Public License v2.1
    * which accompanies this distribution, and is available at
    * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    * 
    * Contributors:
    *     LegSem - initial API and implementation
   ******************************************************************************/
  package com.legstar.coxb.impl;
  
  import com.legstar.coxb.CobolElement;
  import com.legstar.coxb.ICobolArrayOctetStreamBinding;
  import com.legstar.coxb.ICobolComplexBinding;
  import com.legstar.coxb.CobolElementVisitor;
  import com.legstar.coxb.common.CArrayBinding;
  import com.legstar.coxb.host.HostException;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class implements the behavior of an array of binary cobol elements
   * bound to a JAXB byte array property.
   *
   * @author Fady Moussallam
   * 
   */
  public class CArrayOctetStreamBinding extends CArrayBinding
  implements ICobolArrayOctetStreamBinding {
  
      /** The current list for this array. */
      private List < byte[] > mList = null;
  
      /**
       * Constructor for a cobol element to java binding.
       * 
       * @param bindingName the identifier for this binding
       * @param jaxbName the name of the bound java property
       * @param jaxbType the type of the bound java property
       * @param cobolAnnotations the cobol annotations for this element
       * @param parentBinding a reference to the parent binding if any
       */
      public CArrayOctetStreamBinding(
              final String bindingName,
              final String jaxbName,
              final Class < ? > jaxbType,
              final CobolElement cobolAnnotations,
              final ICobolComplexBinding parentBinding) {
          super(bindingName, jaxbName, jaxbType, cobolAnnotations, parentBinding);
      }
  
      /** {@inheritDoc} */
      public void accept(final CobolElementVisitor cev)
      throws HostException {
          cev.visit(this);
      }
  
      /** {@inheritDoc} */
      public int calcItemByteLength() {
          return COctetStreamBinding.calcOctetStreamByteLength(getPicture(), getUsage());
      }
  
      /** {@inheritDoc} */
      public List < byte[] > getValue() throws HostException {
  
          if (mList == null) {
              /* If this element is involved in a redefinition, null means
               * this alternative is not present so send back this information. */
              if (isRedefined() || getRedefines().length() > 0) {
                  return null;
              }
              /* Send back a default value */
              mList = new ArrayList < byte[] >();
          }
  
          return mList;
      }
  
      /** {@inheritDoc} */
      public void setValue(
              final List < byte[] > list) throws HostException {
          mList = list;
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      public void setValue(final Object value) throws HostException {
          if (value == null) {
              mList = null;
              return;
          }
          if (value instanceof List) {
              mList = (List < byte[] >) value;
          } else {
              throw new HostException(
                      "Value passed to " + getBindingName() + " is not a List");
          }
     }
 
     /**
      * @return the List of items
      */
     public List < byte[] > getByteArrayList() {
         return mList;
     }
 
     /**
      * @param list the items List to set
      */
     public void setByteArrayList(
             final List < byte[] > list) {
         mList = list;
     }
 
     /** {@inheritDoc} */
     public Object getObjectValue(
             final Class < ? > type) throws HostException {
         if (type.equals(byte[].class)) {
             return mList;
         } else {
             throw new HostException("Attempt to get binding " + getBindingName()
                     + " as an incompatible type " + type);
         }
     }
 
     /** {@inheritDoc} */
     @SuppressWarnings("unchecked")
     public void setObjectValue(final Object value) throws HostException {
         if (value == null) {
             mList = null;
             return;
         }
         if (value instanceof List) {
             if (((List < ? >) value).size() == 0) {
                 mList = new ArrayList < byte[] >();
                 return;
             }
             /* We assume all items will have the same type as the first one.
              * The unchecked cast might break at runtime. */
             Object item = ((List < ? >) value).get(0);
             if (item instanceof byte[]) {
                 mList = (List < byte[] >) value;
                 return;
             }
         }
         throw new HostException("Attempt to set binding " + getBindingName()
                 + " from an incompatible value " + value);
     }
 
     /** {@inheritDoc} */
     public boolean isSet() {
         return (mList != null);
     }
 }