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This is a utils library for java 8 project. It include parsec combinators and sql generators library.

There is a newer version: 2.9.2

package jaskell.sql;

import jaskell.script.Directive;
import jaskell.script.Parameter;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class By extends Select.From {
    Directive _prefix;
    private List _fields = new ArrayList<>();

    public By(){
    }

    public By(String names){
        _fields.addAll(Arrays.stream(
                names.split(",")).map(String::trim).map(Name::new).collect(Collectors.toList()));
    }

    public By(String... names){
        _fields.addAll(Arrays.stream(names).map(String::trim).map(Name::new).collect(Collectors.toList()));
    }

    public By(Directive ... names){
        _fields.addAll(Arrays.asList(names));
    }

    public By(List names){
        for(Object name: names){
            if(name instanceof String){
                _fields.add(new Name((String) name));
            }
            if(name instanceof Directive){
                _fields.add((Directive) name);
            }
        }
    }

    public By by(String names){
        // TODO: 应更严谨的处理命名转义
        _fields.addAll(Arrays.stream(
                names.split(",")).map(String::trim).map(Name::new).collect(Collectors.toList()));
        return this;
    }

    public By by(String... names){
        _fields.addAll(Arrays.stream(names).map(String::trim).map(Name::new).collect(Collectors.toList()));
        return this;
    }

    public By by(Directive ... names){
        _fields.addAll(Arrays.asList(names));
        return this;
    }

    public By by(List names){
        for(Object name: names){
            if(name instanceof String){
                _fields.add(new Name((String) name));
            }
            if(name instanceof Directive){
                _fields.add((Directive) name);
            }
        }
        return this;
    }

    @Override
    public String script() {
        return String.format("%s BY %s", _prefix.script(),
                _fields.stream().map(Directive::script).collect(Collectors.joining(", ")));
    }

    @Override
    public List> parameters() {
        List> re = _prefix.parameters();
        _fields.forEach(item->re.addAll(item.parameters()));
        return re;
    }
}