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/* 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.flowable.engine.impl.bpmn.data;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.flowable.engine.delegate.DelegateExecution;

/**
 * Implementation of the BPMN 2.0 'ioSpecification'
 * 
 * @author Esteban Robles Luna
 * @author Falko Menge
 */
public class IOSpecification {

    protected List dataInputs;

    protected List dataOutputs;

    protected List dataInputRefs;

    protected List dataOutputRefs;

    public IOSpecification() {
        this.dataInputs = new ArrayList<>();
        this.dataOutputs = new ArrayList<>();
        this.dataInputRefs = new ArrayList<>();
        this.dataOutputRefs = new ArrayList<>();
    }

    public void initialize(DelegateExecution execution) {
        for (Data data : this.dataInputs) {
            execution.setTransientVariable(data.getName(), data.getDefinition().createInstance());
        }

        for (Data data : this.dataOutputs) {
            execution.setTransientVariable(data.getName(), data.getDefinition().createInstance());
        }
    }

    public List getDataInputs() {
        return Collections.unmodifiableList(this.dataInputs);
    }

    public List getDataOutputs() {
        return Collections.unmodifiableList(this.dataOutputs);
    }

    public void addInput(Data data) {
        this.dataInputs.add(data);
    }

    public void addOutput(Data data) {
        this.dataOutputs.add(data);
    }

    public void addInputRef(DataRef dataRef) {
        this.dataInputRefs.add(dataRef);
    }

    public void addOutputRef(DataRef dataRef) {
        this.dataOutputRefs.add(dataRef);
    }

    public String getFirstDataInputName() {
        return this.dataInputs.get(0).getName();
    }

    public String getFirstDataOutputName() {
        if (this.dataOutputs != null && !this.dataOutputs.isEmpty()) {
            return this.dataOutputs.get(0).getName();
        } else {
            return null;
        }
    }
}