org.apache.solr.client.solrj.response.GroupCommand.java Source code

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Here is the source code for org.apache.solr.client.solrj.response.GroupCommand.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.solr.client.solrj.response;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * This class represents the result of a group command.
 * This can be the result of the following parameter:
 * <ul>
 *   <li> group.field
 *   <li> group.func
 *   <li> group.query
 * </ul>
 *
 * An instance of this class contains:
 * <ul>
 *   <li> The name of this command. This can be the field, function or query grouped by.
 *   <li> The total number of documents that have matched.
 *   <li> The total number of groups that have matched.
 *   <li> The groups to be displayed. Depending on the start and rows parameter.
 * </ul>
 *
 * In case of <code>group.query</code> only one group is present and ngroups is always <code>null</code>.
 *
 * @since solr 3.4
 */
public class GroupCommand implements Serializable {

    private final String _name;
    private final List<Group> _values = new ArrayList<>();
    private final int _matches;
    private final Integer _ngroups;

    /**
     * Creates a GroupCommand instance
     *
     * @param name    The name of this command
     * @param matches The total number of documents found for this command
     */
    public GroupCommand(String name, int matches) {
        _name = name;
        _matches = matches;
        _ngroups = null;
    }

    /**
     * Creates a GroupCommand instance.
     *
     * @param name    The name of this command
     * @param matches The total number of documents found for this command
     * @param nGroups The total number of groups found for this command.
     */
    public GroupCommand(String name, int matches, int nGroups) {
        _name = name;
        _matches = matches;
        _ngroups = nGroups;
    }

    /**
     * Returns the name of this command. This can be the field, function or query grouped by.
     *
     * @return the name of this command
     */
    public String getName() {
        return _name;
    }

    /**
     * Adds a group to this command.
     *
     * @param group A group to be added
     */
    public void add(Group group) {
        _values.add(group);
    }

    /**
     * Returns the groups to be displayed.
     * The number of groups returned depend on the <code>start</code> and <code>rows</code> parameters.
     *
     * @return the groups to be displayed.
     */
    public List<Group> getValues() {
        return _values;
    }

    /**
     * Returns the total number of documents found for this command.
     *
     * @return the total number of documents found for this command.
     */
    public int getMatches() {
        return _matches;
    }

    /**
     * Returns the total number of groups found for this command.
     * Returns <code>null</code> if the <code>group.ngroups</code> parameter is unset or <code>false</code> or
     * if this is a group command query (parameter = <code>group.query</code>).
     *
     * @return the total number of groups found for this command.
     */
    public Integer getNGroups() {
        return _ngroups;
    }

}