/**
 * A lookup value with optional aliases
 *
 * toString just gives the primary value,
 * equals just compares against primary value
 * matches() also compares aliases
 *
 * @author ab
 */
package btools.expressions;

import java.util.ArrayList;

final class BExpressionLookupValue
{
  String value;
  ArrayList<String> aliases;

  @Override
  public String toString()
  {
    return value;
  }

  public BExpressionLookupValue( String value )
  {
    this.value = value;
  }

  public void addAlias( String alias )
  {
    if ( aliases == null ) aliases = new ArrayList<String>();
    aliases.add( alias );
  }

  @Override
  public boolean equals( Object o )
  {
    if ( o instanceof String )
    {
      String v = (String)o;
      return value.equals( v );
    }
    if ( o instanceof BExpressionLookupValue )
    {
      BExpressionLookupValue v = (BExpressionLookupValue)o;

      return value.equals( v.value );
    }
    return false;
  }

  public boolean matches( String s )
  {
    if ( value.equals( s ) ) return true;
    if ( aliases != null )
    {
      for( String alias : aliases )
      {
        if ( alias.equals( s ) ) return true;
      }
    }
    return false;
  }

}