com.chadekin.jadys.syntax.groupby.impl.GroupByBuilderImpl.java Source code

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Here is the source code for com.chadekin.jadys.syntax.groupby.impl.GroupByBuilderImpl.java

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/**
 *                     GNU General Public License (GPL)
 *                        version 3.0, 29 June 2007
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 *
 * Copyright (C) 2017 Marc Mamiah.
 * License GPLv3+: GNU GPL version 3
 */
package com.chadekin.jadys.syntax.groupby.impl;

import java.util.Arrays;
import java.util.stream.Stream;
import com.chadekin.jadys.JadysSqlQueryBuilder;
import com.chadekin.jadys.commons.AbstractSqlQueryBuilder;
import com.chadekin.jadys.commons.enums.JadysSqlOperation;
import com.chadekin.jadys.commons.enums.SqlLexical;
import com.chadekin.jadys.commons.resourcekeys.JadysKeys;
import com.chadekin.jadys.sqldialect.DefaultPostGroupByTerm;
import com.chadekin.jadys.syntax.groupby.GroupByBuilder;
import org.apache.commons.lang.StringUtils;

/**
 * GroupByBuilder
 */
public class GroupByBuilderImpl<G> extends AbstractSqlQueryBuilder<GroupByBuilderImpl>
        implements GroupByBuilder<G> {

    protected GroupByBuilderImpl(JadysSqlQueryBuilder parent) {
        super(parent);
    }

    public static GroupByBuilderImpl newGroupByStatement(JadysSqlQueryBuilder parent) {
        return new GroupByBuilderImpl(parent);
    }

    private static boolean isValidExpression(String param, JadysSqlOperation equality, Object value) {
        return StringUtils.isNotBlank(param) && equality != null && value != null
                && StringUtils.isNotBlank(value.toString());
    }

    @Override
    public SqlLexical getType() {
        return SqlLexical.GROUP_BY;
    }

    @Override
    public GroupByBuilderImpl apply(String... expression) {
        if (expression == null || Arrays.asList(expression).isEmpty()) {
            return this;
        }

        Stream.of(expression).forEach(expr -> {
            extractAlias(expr).stream().forEach(this::withAlias);
            append(expr);
        });

        return this;
    }

    private void append(String dbColumn) {
        if (StringUtils.isBlank(dbColumn))
            throw new IllegalArgumentException("Undefined parameter for 'GROUP BY' clause");
        if (getResultSql() == null) {
            setResultSql(new StringBuilder());
        }
        appendStatement();
        getResultSql().append(dbColumn);
    }

    private void appendStatement() {
        if (getResultSql().length() > 0) {
            getResultSql().append(JadysKeys.COMMA).append(JadysKeys.SPACE);
        }
    }

}