// Path: queryfy-core/src/main/java/org/evcode/queryfy/core/Visitor.java
// public interface Visitor<R, P> {
// 
//     <T> T visit(ProjectionNode node, P param);
// 
//     R visit(AndNode node, P param);
// 
//     R visit(OrNode node, P param);
// 
//     R visit(FilterNode node, P param);
// 
//     <T> T visit(OrderNode node, P param);
// 
//     <T> T visit(LimitNode node, P param);
// }


import org.evcode.queryfy.core.Visitor;
import java.util.Collections;
import java.util.Set;
/*
 * Copyright 2017 EVCode
 *
 * 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 org.evcode.queryfy.core.parser.ast;



public final class ProjectionNode implements Node {

    private final Set<String> selectors;

    public ProjectionNode(Set<String> selectors) {
        this.selectors = selectors;
    }

    public Set<String> getSelectors() {
        return Collections.unmodifiableSet(selectors);
    }

// Path: queryfy-core/src/main/java/org/evcode/queryfy/core/Visitor.java
// public interface Visitor<R, P> {
// 
//     <T> T visit(ProjectionNode node, P param);
// 
//     R visit(AndNode node, P param);
// 
//     R visit(OrNode node, P param);
// 
//     R visit(FilterNode node, P param);
// 
//     <T> T visit(OrderNode node, P param);
// 
//     <T> T visit(LimitNode node, P param);
// }


// Path: queryfy-core/src/main/java/org/evcode/queryfy/core/parser/ast/ProjectionNode.java
import org.evcode.queryfy.core.Visitor;
import java.util.Collections;
import java.util.Set;

/*
 * Copyright 2017 EVCode
 *
 * 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 org.evcode.queryfy.core.parser.ast;



public final class ProjectionNode implements Node {

    private final Set<String> selectors;

    public ProjectionNode(Set<String> selectors) {
        this.selectors = selectors;
    }

    public Set<String> getSelectors() {
        return Collections.unmodifiableSet(selectors);
    }

    @Override