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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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