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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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