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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* 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 com.iciql.bytecode;
import com.iciql.Query;
import com.iciql.SQLStatement;
import com.iciql.Token;
/**
* A conditional expression.
*/
public class CaseWhen implements Token {
private final Token condition, ifTrue, ifFalse;
private CaseWhen(Token condition, Token ifTrue, Token ifFalse) {
this.condition = condition;
this.ifTrue = ifTrue;
this.ifFalse = ifFalse;
}
static Token get(Token condition, Token ifTrue, Token ifFalse) {
if ("0".equals(ifTrue.toString()) && "1".equals(ifFalse.toString())) {
return Not.get(condition);
} else if ("1".equals(ifTrue.toString()) && "0".equals(ifFalse.toString())) {
return condition;
} else if ("0".equals(ifTrue.toString())) {
return And.get(Not.get(condition), ifFalse);
}
return new CaseWhen(condition, ifTrue, ifFalse);
}
public String toString() {
return "CASEWHEN(" + condition + ", " + ifTrue + ", " + ifFalse + ")";
}
public <T> void appendSQL(SQLStatement stat, Query<T> query) {
stat.appendSQL("CASEWHEN ");
condition.appendSQL(stat, query);
stat.appendSQL(" THEN ");
ifTrue.appendSQL(stat, query);
stat.appendSQL(" ELSE ");
ifFalse.appendSQL(stat, query);
stat.appendSQL(" END");
}
}
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