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/*
* 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.brooklyn.core.workflow.steps.variables;
import org.apache.brooklyn.core.workflow.WorkflowExpressionResolution;
import org.apache.brooklyn.util.collections.MutableList;
import org.apache.brooklyn.util.javalang.Boxing;
import org.apache.brooklyn.util.text.Strings;
import java.util.List;
public class TransformPrependAppend extends WorkflowTransformDefault {
boolean atEnd;
String expression;
public TransformPrependAppend(boolean atEnd) {
this.atEnd = atEnd;
}
@Override
protected void initCheckingDefinition() {
List<String> d = MutableList.copyOf(definition.subList(1, definition.size()));
if (d.size()!=1) throw new IllegalArgumentException("Transform requires a single argument being the item to prepend or append");
expression = d.get(0);
}
@Override
public Object apply(Object v) {
Object expressionResolved = context.resolve(WorkflowExpressionResolution.WorkflowExpressionStage.STEP_RUNNING, expression, Object.class);
if (Boxing.isPrimitiveOrStringOrBoxedObject(v)) {
if (!(Boxing.isPrimitiveOrStringOrBoxedObject(expressionResolved))) {
throw new IllegalStateException("Argument must be a string or primitive to prepend/append");
}
if (atEnd) return Strings.toString(v) + expressionResolved;
else return expressionResolved + Strings.toString(v);
} else if (v instanceof Iterable) {
List list = MutableList.copyOf((Iterable)v);
if (atEnd) list.add(expressionResolved);
else list.add(0, expressionResolved);
return list;
} else {
throw new IllegalStateException("Input must be a list or a string/primitive to prepend/append");
}
}
}