/**
* Licensed to the Austrian Association for Software Tool Integration (AASTI)
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. The AASTI 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.openengsb.core.ekb.transformation.wonderland.internal.operation;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.openengsb.core.ekb.api.transformation.TransformationConstants;
import org.openengsb.core.ekb.api.transformation.TransformationOperationException;
import com.google.common.base.Joiner;
/**
* The concat operation concatenates all source field values of the operation and use the concat string parameter as
* string which is put between the field values.
*/
public class ConcatOperation extends AbstractStandardTransformationOperation {
private String concatStringParam = TransformationConstants.CONCAT_PARAM;
public ConcatOperation(String operationName) {
super(operationName, ConcatOperation.class);
}
@Override
public String getOperationDescription() {
return theOperation().does("concatenates all source fields with the given concatenation string.")
.toString();
}
@Override
public Integer getOperationInputCount() {
return -1;
}
@Override
public Map<String, String> getOperationParameterDescriptions() {
Map<String, String> params = new HashMap<String, String>();
params.put(concatStringParam, "Defines the string which is placed between the concatenated values");
return params;
}
@Override
public Object performOperation(List<Object> input, Map<String, String> parameters)
throws TransformationOperationException {
checkInputSize(input);
String concatString = getParameterOrDefault(parameters, concatStringParam, "");
return Joiner.on(concatString).join(input);
}
}