src/main/java/net/hydromatic/linq4j/expressions/UnaryExpression.java

/*
// 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;

/**
 * Represents an expression that has a unary operator.
 */
public class UnaryExpression extends Expression {
    private final Expression expression;

    UnaryExpression(
        ExpressionType nodeType, Class type, Expression expression)
    {
        super(nodeType, type);
        this.expression = expression;
    }

    void accept(ExpressionWriter writer, int lprec, int rprec) {
        switch (nodeType) {
        case Convert:
            if (!writer.requireParentheses(this, lprec, rprec)) {
                writer.append("(")
                    .append(type)
                    .append(") ");
                expression.accept(writer, nodeType.rprec, rprec);
            }
            return;
        }
        if (nodeType.postfix) {
            expression.accept(writer, lprec, rprec);
            writer.append(nodeType.op);
        } else {
            writer.append(nodeType.op);
            expression.accept(writer, lprec, rprec);
        }

//        (String) ((Object) "foo").
    }
}

// End UnaryExpression.java