/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.atlas.groovy;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

/**
 * Groovy expression that represents a Groovy closure.
 */
public class ClosureExpression extends AbstractGroovyExpression {

    private List<String> varNames = new ArrayList<>();
    private GroovyExpression body;

    public ClosureExpression(GroovyExpression body, String... varNames) {
        this.body = body;
        this.varNames.addAll(Arrays.asList(varNames));
    }

    public ClosureExpression(List<String> varNames, GroovyExpression body) {
        this.body = body;
        this.varNames.addAll(varNames);
    }

    @Override
    public void generateGroovy(GroovyGenerationContext context) {

        context.append("{");
        if (!varNames.isEmpty()) {
            Iterator<String> varIt = varNames.iterator();
            while(varIt.hasNext()) {
                String varName = varIt.next();
                context.append(varName);
                if (varIt.hasNext()) {
                    context.append(", ");
                }
            }
            context.append("->");
        }
        body.generateGroovy(context);
        context.append("}");

    }
}
