| /* |
| * 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 java.util.List; |
| import java.util.stream.Collectors; |
| |
| 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; |
| |
| public class TransformJoin extends WorkflowTransformDefault { |
| |
| String separator; |
| |
| @Override |
| protected void initCheckingDefinition() { |
| List<String> d = MutableList.copyOf(definition.subList(1, definition.size())); |
| if (d.size()>1) throw new IllegalArgumentException("Transform requires zero or one arguments being a token to insert between elements"); |
| if (!d.isEmpty()) separator = d.get(0); |
| } |
| |
| @Override |
| public Object apply(Object v) { |
| Object separatorResolvedO = separator==null ? "" : context.resolve(WorkflowExpressionResolution.WorkflowExpressionStage.STEP_RUNNING, separator, Object.class); |
| if (!(Boxing.isPrimitiveOrStringOrBoxedObject(separatorResolvedO))) { |
| throw new IllegalStateException("Argument must be a string or primitive to use as the separator"); |
| } |
| String separatorResolved = ""+separatorResolvedO; |
| if (v instanceof Iterable) { |
| List list = MutableList.copyOf((Iterable)v); |
| return list.stream().map(x -> { |
| if (!(Boxing.isPrimitiveOrStringOrBoxedObject(x))) { |
| throw new IllegalStateException("Elements in the list to join must be a strings or primitives"); |
| } |
| return ""+x; |
| }).collect(Collectors.joining(separatorResolved)); |
| } else { |
| throw new IllegalStateException("Input must be a list to join"); |
| } |
| } |
| |
| } |