nextflow.dag.MultipleInputChannelException.groovy Maven / Gradle / Ivy

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A DSL modelled around the UNIX pipe concept, that simplifies writing parallel and scalable pipelines in a portable manner

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/*
 * Copyright 2013-2024, Seqera Labs
 *
 * 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 nextflow.dag
import groovy.transform.PackageScope
import groovy.transform.ToString
import nextflow.dag.DAG.Vertex
/**
 * Exception thrown when the same channel is declared as input more than one time.
 *
 * @author Paolo Di Tommaso 
 */
@ToString(includeNames = true)
class MultipleInputChannelException extends Exception {

    MultipleInputChannelException( String name, Vertex duplicate, Vertex existing ) {
        super(message(name,duplicate,existing))
    }

    @PackageScope
    static String message(String name, Vertex duplicate, Vertex existing) {
        if( !name ) {
            return 'Channels cannot be used as input in more than one process or operator'
        }

        if( !duplicate || duplicate.type != DAG.Type.PROCESS ) {
            return "Channel `$name` has been used as an input by more than a process or an operator"
        }

        String message = "Channel `$name` has been used twice as an input by process `${duplicate.label}`"
        if( existing != duplicate ) {
            message += existing?.type == DAG.Type.PROCESS ? " and process `${existing.label}`" : " and another operator"
        }
        return message
    }

}