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com.github.exerrk.engine.query.JRSqlAbstractInClause Maven / Gradle / Ivy

/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2016 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see .
 */
package com.github.exerrk.engine.query;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import com.github.exerrk.engine.JRRuntimeException;


/**
 * Base (NOT) IN clause function for SQL queries.
 * 
 * 

 * The first token in the $X{...} syntax is the function ID token. Possible values for 
 * the (NOT) IN clause function ID token are:
 * 

 * 
IN
 * 
NOTIN
 * 
 * 
 
 * 
 * @author Lucian Chirita ([email protected])
 */
public abstract class JRSqlAbstractInClause implements JRClauseFunction
{
	public static final String EXCEPTION_MESSAGE_KEY_QUERY_IN_CLAUSE_DB_COLUMN_TOKEN_MISSING = "query.in.clause.db.column.token.missing";
	public static final String EXCEPTION_MESSAGE_KEY_QUERY_IN_CLAUSE_INVALID_PARAMETER_TYPE = "query.in.clause.invalid.parameter.type";
	public static final String EXCEPTION_MESSAGE_KEY_QUERY_IN_CLAUSE_PARAMETER_TOKEN_MISSING = "query.in.clause.parameter.token.missing";
	
	protected static final int POSITION_DB_COLUMN = 1;
	protected static final int POSITION_PARAMETER = 2;

	protected static final String CLAUSE_TRUISM = "0 = 0";
	
	protected JRSqlAbstractInClause()
	{
	}

	/**
	 * Creates a (NOT) IN SQL clause.
	 * 
	 * 

	 * The function expects two clause tokens (after the ID token):
	 * 

	 * 	
The first token is the SQL column to be used in the clause.
	 * 	
The second token is the name of the report parameter that contains the value list.
	 * 		

	 * 		The value of this parameter has to be an array, a java.util.Collection
	 * 		or null.
	 * 	
	 * 
	 * 

	 * 
	 * 

	 * The function constructs one of the following clauses:
	 * 

	 * 
When the function ID token is IN:
	 * 

	 * 
If the parameter's value is a collection of not null values, the function constructs 
	 * a <column_name> IN (?, ?, .., ?) clause
	 * 
If the parameter's value is a collection containing both null and not null values, the 
	 * function constructs a (<column_name> IS NULL OR <column_name> IN (?, ?, .., ?)) clause
	 * 
If the parameter's value is a collection containing only null values, the function 
	 * constructs a <column_name> IS NULL clause
	 * 
	 * 
	 * 
When the function ID token is NOTIN:
	 * 

	 * 
If the parameter's value is a collection of not null values, the function constructs 
	 * a <column_name> NOT IN (?, ?, .., ?) clause
	 * 
If the parameter's value is a collection containing both null and not null values, the 
	 * function constructs a (<column_name> IS NOT NULL AND <column_name> NOT IN (?, ?, .., ?)) clause
	 * 
If the parameter's value is a collection containing only null values, the function 
	 * constructs a <column_name> IS NOT NULL clause
	 * 
	 * 
	 * 
If the values list is null or empty, both IN and NOTIN functions generate a SQL clause that
	 * will always evaluate to true (e.g. 0 = 0).
	 * 
	 * 

	 * 
	 * @param clauseTokens
	 * @param queryContext
	 * 
	 */
	@Override
	public void apply(JRClauseTokens clauseTokens, JRQueryClauseContext queryContext)
	{
		String col = clauseTokens.getToken(POSITION_DB_COLUMN);
		String param = clauseTokens.getToken(POSITION_PARAMETER);
		if (col == null)
		{
			throw 
				new JRRuntimeException(
					EXCEPTION_MESSAGE_KEY_QUERY_IN_CLAUSE_DB_COLUMN_TOKEN_MISSING,
					(Object[])null);
		}
		
		if (param == null)
		{
			throw 
				new JRRuntimeException(
					EXCEPTION_MESSAGE_KEY_QUERY_IN_CLAUSE_PARAMETER_TOKEN_MISSING,
					(Object[])null);
		}
		
		StringBuffer sbuffer = queryContext.queryBuffer();
		
		Object paramValue = queryContext.getValueParameter(param).getValue();
		if (paramValue == null)
		{
			handleNoValues(queryContext);
		}
		else
		{
			Collection paramCollection = convert(param, paramValue);
			int count = paramCollection.size();
			Iterator it = paramCollection.iterator();

			if (count == 0)
			{
				handleNoValues(queryContext);
			}
			else
			{
				StringBuffer nullSbuffer = new StringBuffer();
				StringBuffer notNullSbuffer = new StringBuffer();
				boolean nullFound = false;
				boolean notNullFound = false;
				int idx = 0;
				List