public BoostQueryNode(QueryNode query,
    float value) throws QueryNodeException 
{
    if (query == null) {
      throw new QueryNodeError(new MessageImpl(
          QueryParserMessages.NODE_ACTION_NOT_SUPPORTED, "query", "null"));
    }
    this.value = value;
    setLeaf(false);
    allocate();
    add(query);
}

Constructs a boost node

Parameters:

query - the query to be boosted

value - the boost value, it may vary from 0.0 to 1.0

Throws:

QueryNodeException -

 public QueryNode cloneTree() throws CloneNotSupportedException 
{
    BoostQueryNode clone = (BoostQueryNode) super.cloneTree();
    clone.value = this.value;
    return clone;
}

 public QueryNode getChild() 
{
    List< QueryNode > children = getChildren();
    if (children == null || children.size() == 0) {
      return null;
    }
    return children.get(0);
}

Returns the single child which this node boosts.

 public float getValue() 
{
    return this.value;
}

Returns the boost value. It may vary from 0.0 to 1.0.

 public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) 
{
    if (getChild() == null)
      return "";
    return getChild().toQueryString(escapeSyntaxParser) + "^"
        + getValueString();
}

 public String toString() 
{
    return "< boost value='" + getValueString() + "' >" + "\n"
        + getChild().toString() + "\n< /boost >";
}