org.protempa.backend.dsb.relationaldb.LikeWhereConstraintProcessor Maven / Gradle / Ivy

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Implements support for retrieving data from relational databases.

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/*
 * #%L
 * Protempa Commons Backend Provider
 * %%
 * Copyright (C) 2012 - 2013 Emory University
 * %%
 * Licensed 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.
 * #L%
 */
package org.protempa.backend.dsb.relationaldb;

import org.protempa.backend.dsb.relationaldb.Operator;

final class LikeWhereConstraintProcessor extends WhereConstraintProcessor {

    LikeWhereConstraintProcessor(ColumnSpec columnSpec, Operator constraint,
            WhereClause whereClause, Object[] sqlCodes,
            TableAliaser referenceIndices) {
        super(columnSpec, constraint, whereClause, sqlCodes, referenceIndices);
    }

    @Override
    protected String processConstraint() {
        StringBuilder result = new StringBuilder();

        if (getSqlCodes().length > 1) {
            result.append('(');
        }
        for (int i = 0; i < getSqlCodes().length; i++) {
            result.append(getReferenceIndices().generateColumnReferenceWithOp(
                    getColumnSpec()));
            result.append(" LIKE ");
            result.append(SqlGeneratorUtil.prepareValue(getSqlCodes()[i]));
            if (i + 1 < getSqlCodes().length) {
                result.append(" OR ");
            }
        }
        if (getSqlCodes().length > 1) {
            result.append(')');
        }

        return result.toString();
    }
}