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MyBatis framework for generating dynamic SQL

There is a newer version: 1.5.2

/**
 *    Copyright 2016-2019 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.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collector;
import java.util.stream.Stream;

public class FragmentCollector {
    List fragments = new ArrayList<>();
    Map parameters = new HashMap<>();
    
    FragmentCollector() {
        super();
    }
    
    private FragmentCollector(FragmentAndParameters initialFragment) {
        add(initialFragment);
    }
    
    public void add(FragmentAndParameters fragmentAndParameters) {
        fragments.add(fragmentAndParameters.fragment());
        parameters.putAll(fragmentAndParameters.parameters());
    }
    
    public FragmentCollector merge(FragmentCollector other) {
        fragments.addAll(other.fragments);
        parameters.putAll(other.parameters);
        return this;
    }
    
    public Stream fragments() {
        return fragments.stream();
    }
    
    public Map parameters() {
        return parameters;
    }
    
    public boolean hasMultipleFragments() {
        return fragments.size() > 1;
    }
    
    public boolean isEmpty() {
        return fragments.isEmpty();
    }
    
    public static Collector collect() {
        return Collector.of(FragmentCollector::new,
                FragmentCollector::add,
                FragmentCollector::merge);
    }

    public static Collector collect(
            FragmentAndParameters initialFragment) {
        return Collector.of(() -> new FragmentCollector(initialFragment),
                FragmentCollector::add,
                FragmentCollector::merge);
    }
}