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Copy pathCase.java
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181 lines (145 loc) · 4.14 KB
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package jaskell.sql;
import jaskell.script.Directive;
import jaskell.script.Parameter;
import java.util.ArrayList;
import java.util.List;
public class Case implements Directive {
Directive _argument = null;
Case(){
}
Case(Directive argument){
this._argument = argument;
}
@Override
public String script() {
if(_argument == null) {
return String.format("CASE");
}else{
return String.format("CASE %s", _argument.script());
}
}
@Override
public List<Parameter<?>> parameters() {
if(_argument != null){
return _argument.parameters();
}
return new ArrayList<>();
}
public static class When implements Directive {
Directive _prefix;
Directive _cond;
When(Directive cond){
this._cond = cond;
}
@Override
public String script() {
return String.format("%s WHEN %s", _prefix.script(), _cond.script());
}
@Override
public List<Parameter<?>> parameters() {
List<Parameter<?>> re = _prefix.parameters();
re.addAll(_cond.parameters());
return re;
}
public Then then(Directive expr){
Then re = new Then(expr);
re._prefix = this;
return re;
}
}
public static class Then implements Directive {
Directive _prefix;
Directive _expr;
Then(Directive expr){
this._expr = expr;
}
@Override
public String script() {
return String.format("%s THEN %s", _prefix.script(), _expr.script());
}
@Override
public List<Parameter<?>> parameters() {
List<Parameter<?>> re = _prefix.parameters();
re.addAll(_expr.parameters());
return re;
}
public When when(Predicate predicate){
When re = new When(predicate);
re._prefix = this;
return re;
}
public End end(){
End re = new End();
re._prefix = this;
return re;
}
public Else _else(Directive expr){
Else re = new Else(expr);
re._prefix = this;
return re;
}
}
public static class Else implements Directive {
Directive _prefix;
Directive _expr;
Else(Directive expr){
this._expr = expr;
}
@Override
public String script() {
return String.format("%s ELSE %s", _prefix.script(), _expr.script());
}
@Override
public List<Parameter<?>> parameters() {
List<Parameter<?>> re = _prefix.parameters();
re.addAll(_expr.parameters());
return re;
}
public End end(){
End re = new End();
re._prefix = this;
return re;
}
}
public static class End implements Directive {
Directive _prefix;
@Override
public String script() {
return String.format("%s END", _prefix.script());
}
@Override
public List<Parameter<?>> parameters() {
return _prefix.parameters();
}
public Alias as(String name){
Alias re = new Alias(name);
re._prefix = this;
return re;
}
public Alias as(Name name){
Alias re = new Alias(name.name());
re._prefix = this;
return re;
}
}
public static class Alias implements Directive{
Directive _prefix;
Directive _name;
Alias(String alias) {
this._name = new Name(alias);
}
Alias(Literal alias) {
this._name = new Name(alias.script());
}
@Override
public String script() {
return String.format("%s AS %s", _prefix.script(), _name.script());
}
@Override
public List<Parameter<?>> parameters() {
List<Parameter<?>> re = _prefix.parameters();
re.addAll(_name.parameters());
return re;
}
}
}