| /* |
| // Licensed to Julian Hyde under one or more contributor license |
| // agreements. See the NOTICE file distributed with this work for |
| // additional information regarding copyright ownership. |
| // |
| // Julian Hyde licenses this file to you 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 net.hydromatic.linq4j.expressions; |
| |
| import java.lang.reflect.Type; |
| |
| /** |
| * Represents a named parameter expression. |
| */ |
| public class ParameterExpression extends Expression { |
| private static int seq = 0; |
| |
| final String name; |
| |
| public ParameterExpression(Type type) { |
| this(type, "p" + seq++); |
| } |
| |
| public ParameterExpression(Type type, String name) { |
| super(ExpressionType.Parameter, type); |
| this.name = name; |
| } |
| |
| public Object evaluate(Evaluator evaluator) { |
| return evaluator.peek(this); |
| } |
| |
| @Override |
| void accept(ExpressionWriter writer, int lprec, int rprec) { |
| writer.append(name); |
| } |
| } |
| |
| // End ParameterExpression.java |