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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 mathematical or comparison operation.
*/
class Operation implements Token {
/**
* The operation type.
*/
enum Type {
EQUALS("=") {
Type reverse() {
return NOT_EQUALS;
}
},
NOT_EQUALS("<>") {
Type reverse() {
return EQUALS;
}
},
BIGGER(">") {
Type reverse() {
return SMALLER_EQUALS;
}
},
BIGGER_EQUALS(">=") {
Type reverse() {
return SMALLER;
}
},
SMALLER_EQUALS("<=") {
Type reverse() {
return BIGGER;
}
},
SMALLER("<") {
Type reverse() {
return BIGGER_EQUALS;
}
},
ADD("+"), SUBTRACT("-"), MULTIPLY("*"), DIVIDE("/"), MOD("%");
private String name;
Type(String name) {
this.name = name;
}
public String toString() {
return name;
}
Type reverse() {
return null;
}
}
private final Token left, right;
private final Type op;
private Operation(Token left, Type op, Token right) {
this.left = left;
this.op = op;
this.right = right;
}
static Token get(Token left, Type op, Token right) {
if (op == Type.NOT_EQUALS && "0".equals(right.toString())) {
return left;
}
return new Operation(left, op, right);
}
public String toString() {
return left + " " + op + " " + right;
}
public Token reverse() {
return get(left, op.reverse(), right);
}
public <T> void appendSQL(SQLStatement stat, Query<T> query) {
left.appendSQL(stat, query);
stat.appendSQL(op.toString());
right.appendSQL(stat, query);
}
}
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