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1 files changed, 62 insertions, 0 deletions

diff --git a/src/main/java/com/iciql/bytecode/CaseWhen.java b/src/main/java/com/iciql/bytecode/CaseWhen.java
new file mode 100644
index 0000000..2a1d69e
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+++ b/src/main/java/com/iciql/bytecode/CaseWhen.java
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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");
+	}
+
+}