/*******************************************************************************
    * 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 java.math.BigDecimal;
  import com.legstar.coxb.CobolElement;
  import com.legstar.coxb.ICobolComplexBinding;
  import com.legstar.coxb.ICobolDoubleBinding;
  import com.legstar.coxb.CobolElementVisitor;
  import com.legstar.coxb.common.CBinding;
  import com.legstar.coxb.host.HostException;
  
  /**
   * This class implements the behavior of a comp-2 cobol element bound to
   * a JAXB Double property.
   *
   * @author Fady Moussallam
   * 
   */
  public class CDoubleBinding extends CBinding implements ICobolDoubleBinding {
  
      /** The current value for this element. */
      private Double mValue = null;
      
      /** Doubles have a fixed host byte length. */
      public static final int BYTE_LENGTH = 8;
  
      /**
       * 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
       */
      public CDoubleBinding(
              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 Double getDoubleValue() throws HostException {
          return mValue;
      }
  
      /** {@inheritDoc} */
      public void setDoubleValue(final Double value) throws HostException {
          mValue = value;
      }
  
      /** {@inheritDoc} */
      public BigDecimal getBigDecimalValue() throws HostException {
          return new BigDecimal(mValue);
      }
  
      /** {@inheritDoc} */
      public void setBigDecimalValue(
              final BigDecimal value) throws HostException {
          mValue = value.doubleValue();
      }
  
      /** {@inheritDoc} */
      public int calcByteLength() {
          return calcDoubleByteLength();
      }
      
      /**
       * Calculates the host byte length for a COMP-2.
       * @return the host byte length for a COMP-2
       */
      public static int calcDoubleByteLength() {
          return BYTE_LENGTH;
      }
  
      /** {@inheritDoc} */
      public Object getObjectValue(
              final Class < ? > type) throws HostException {
          if (type.equals(Double.class) || type.equals(double.class)) {
              return mValue;
          } else if (type.equals(BigDecimal.class)) {
             return getBigDecimalValue();
         } else {
             throw new HostException("Attempt to get binding " + getBindingName()
                     + " as an incompatible type " + type);
         }
     }
 
     /** {@inheritDoc} */
     public void setObjectValue(final Object value) throws HostException {
         if (value == null) {
             mValue = null;
             return;
         }
         if (value instanceof Double) {
             mValue = (Double) value;
         } else if (value instanceof BigDecimal) {
             setBigDecimalValue((BigDecimal) value);
         } else {
             throw new HostException("Attempt to set binding " + getBindingName()
                     + " from an incompatible value " + value);
         }
     }
 
     /** {@inheritDoc} */
     public boolean isSet() {
         return (mValue != null);
     }
 }