org.apache.lucene.queryParser.core.nodes: public class: GroupQueryNode

org.apache.lucene.queryParser.core.nodes
public class: GroupQueryNode [javadoc | source]

java.lang.Object
   org.apache.lucene.queryParser.core.nodes.QueryNodeImpl
      org.apache.lucene.queryParser.core.nodes.GroupQueryNode

All Implemented Interfaces:
Cloneable, QueryNode

A GroupQueryNode represents a location where the original user typed real parenthesis on the query string. This class is useful for queries like: a) a AND b OR c b) ( a AND b) OR c Parenthesis might be used to define the boolean operation precedence.

Fields inherited from org.apache.lucene.queryParser.core.nodes.QueryNodeImpl:
PLAINTEXT_FIELD_NAME, toQueryStringIgnoreFields

Constructor:
public GroupQueryNode(QueryNode query) { if (query == null) { throw new QueryNodeError(new MessageImpl( QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null")); } allocate(); setLeaf(false); add(query); } This QueryNode is used to identify parenthesis on the original query string

Constructor:

 public GroupQueryNode(QueryNode query) {
    if (query == null) {
      throw new QueryNodeError(new MessageImpl(
          QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));
    }
    allocate();
    setLeaf(false);
    add(query);
}

This QueryNode is used to identify parenthesis on the original query string

Method from org.apache.lucene.queryParser.core.nodes.GroupQueryNode Summary:
cloneTree, getChild, setChild, toQueryString, toString

Methods from org.apache.lucene.queryParser.core.nodes.QueryNodeImpl:
add, add, allocate, clone, cloneTree, containsTag, getChildren, getParent, getTag, getTags, isDefaultField, isLeaf, isRoot, set, setLeaf, setTag, toString, unsetTag

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.apache.lucene.queryParser.core.nodes.GroupQueryNode Detail:
public QueryNode cloneTree() throws CloneNotSupportedException { GroupQueryNode clone = (GroupQueryNode) super.cloneTree(); return clone; }
public QueryNode getChild() { return getChildren().get(0); }
public void setChild(QueryNode child) { List< QueryNode > list = new ArrayList< QueryNode >(); list.add(child); this.set(list); }
public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) { if (getChild() == null) return ""; return "( " + getChild().toQueryString(escapeSyntaxParser) + " )"; }
public String toString() { return "< group >" + "\n" + getChild().toString() + "\n< /group >"; }