All Downloads are FREE. Search and download functionalities are using the official Maven repository.
  • Log In
  • Register

    • org.bridje.orm.impl.BinaryCondition Maven / Gradle / Ivy

    /*
 * Copyright 2016 Bridje Framework.
 *
 * 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.
 */

package org.bridje.orm.impl;

import java.util.List;
import org.bridje.orm.Column;
import org.bridje.orm.Condition;
import org.bridje.orm.EntityContext;

/**
 * A condition with two operators. This condition can be use with the binary
 * operators in the Operator enum like EQ("="), GT(">"), GE(">="), LT("<"),
 * LE("<="), NE("<>"), AND("and"), OR("or")
 */
class BinaryCondition extends AbstractCondition
{
    private final Object firstOperand;

    private final Operator operator;

    private final Object secondOperand;

    public BinaryCondition(Object firstOperand, Operator operator, Object secondOperand)
    {
        this.firstOperand = firstOperand;
        this.operator = operator;
        this.secondOperand = secondOperand;
    }

    @Override
    public String writeSQL(List parameters, EntityContext ctx)
    {
        StringBuilder sb = new StringBuilder();

        writeOperand(firstOperand, parameters, sb, ctx);
        sb.append(' ');
        sb.append(operator.toString());
        sb.append(' ');
        writeOperand(secondOperand, parameters, sb, ctx);

        return sb.toString();
    }

    /**
     * This method writes and operant to the StringBuilder when the condition is
     * being serialized in the writeString method.
     *
     * @param operand The operant to be writed
     * @param parameters The parameters list for the query.
     * @param sb THe StringBuilder to write the result.
     */
    private void writeOperand(Object operand, List parameters, StringBuilder sb, EntityContext ctx)
    {
        if (operand instanceof Column)
        {
            writeColumn((Column) operand, parameters, sb, ctx);
        }
        else if (operand instanceof Condition)
        {
            writeCondition((Condition) operand, parameters, sb, ctx);
        }
        else
        {
            writeLiteral(operand, parameters, sb);
        }
    }

    /**
     * This method writes a column as one of the operands of the current
     * condition when this object is being serialized.
     *
     * @param column The column operand to write.
     * @param parameters The parameters list for the query.
     * @param sb THe StringBuilder to write the result.
     */
    private void writeColumn(Column column, List parameters, StringBuilder sb, EntityContext ctx)
    {
        sb.append(column.writeSQL(parameters, ctx));
    }

    /**
     * This method writes a condition as one of the operands of the current
     * condition when this object is being serialized.
     *
     * @param condition
     * @param parameters The parameters list for the query.
     * @param cnf The ColumnNameFinder that will be use for writing columns
     * names in the condition.
     * @param sb THe StringBuilder to write the result.
     */
    private void writeCondition(Condition condition, List parameters, StringBuilder sb, EntityContext ctx)
    {
        sb.append('(');
        sb.append(condition.writeSQL(parameters, ctx));
        sb.append(')');
    }

    /**
     * This method writes a literal parameter as one of the operands of the current
     * condition when this object is being serialized.
     *
     * @param operand The operand literal to write.
     * @param parameters The parameters list for the query.
     * @param sb THe StringBuilder to write the result.
     */
    private void writeLiteral(Object operand, List parameters, StringBuilder sb)
    {
        parameters.add(operand);
        sb.append('?');
    }
}
    
    
    
    

    




    
    
    © 2015 - 2025 Weber Informatics LLC | Privacy Policy