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MyBatis framework for generating dynamic SQL

There is a newer version: 1.5.2

/**
 *    Copyright 2016-2018 the original author or authors.
 *
 *    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.mybatis.dynamic.sql;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Stream;

public abstract class AbstractListValueCondition implements VisitableCondition {
    private List values;

    protected AbstractListValueCondition(AbstractBuilder builder) {
        values = Objects.requireNonNull(builder.values);
    }
    
    public final  Stream mapValues(Function mapper) {
        return values.stream()
                .map(this::mapValue)
                .map(mapper);
    }
    
    @Override
    public  R accept(ConditionVisitor visitor) {
        return visitor.visit(this);
    }

    /**
     * This method allows subclasses to alter the value before it is placed
     * into the parameter map.  An example of this is when the case insensitive
     * conditions will change a value to upper case.
     * 
     * We do not expose the values stream because we cannot allow subclasses
     * to change the order or number of values.
     *  
     * @param value the value
     * @return the mapped value - in most cases the value is not changed
     */
    protected T mapValue(T value) {
        return value;
    }
    
    public abstract String renderCondition(String columnName, Stream placeholders);
    
    public abstract static class AbstractBuilder> {
        private List values = new ArrayList<>();
        
        public B withValues(List values) {
            this.values.addAll(values);
            return getThis();
        }
        
        public abstract B getThis();
    }
}