| /* |
| * 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.nifi.components.validation; |
| |
| import org.apache.nifi.components.PropertyDependency; |
| import org.apache.nifi.components.PropertyDescriptor; |
| import org.apache.nifi.components.PropertyValue; |
| import org.apache.nifi.components.ValidationContext; |
| import org.apache.nifi.controller.PropertyConfiguration; |
| import org.apache.nifi.parameter.ParameterLookup; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.Function; |
| |
| public abstract class AbstractValidationContext implements ValidationContext { |
| private static final Logger logger = LoggerFactory.getLogger(AbstractValidationContext.class); |
| |
| private final ParameterLookup parameterLookup; |
| private final Map<PropertyDescriptor, PropertyConfiguration> properties; |
| |
| public AbstractValidationContext(final ParameterLookup parameterLookup, final Map<PropertyDescriptor, PropertyConfiguration> properties) { |
| this.parameterLookup = parameterLookup; |
| this.properties = properties; |
| } |
| |
| |
| public boolean isDependencySatisfied(final PropertyDescriptor propertyDescriptor, final Function<String, PropertyDescriptor> propertyDescriptorLookup) { |
| return isDependencySatisfied(propertyDescriptor, propertyDescriptorLookup, new HashSet<>()); |
| } |
| |
| private boolean isDependencySatisfied(final PropertyDescriptor propertyDescriptor, final Function<String, PropertyDescriptor> propertyDescriptorLookup, final Set<String> propertiesSeen) { |
| final Set<PropertyDependency> dependencies = propertyDescriptor.getDependencies(); |
| if (dependencies.isEmpty()) { |
| logger.debug("Dependency for {} is satisfied because it has no dependencies", propertyDescriptor); |
| return true; |
| } |
| |
| final boolean added = propertiesSeen.add(propertyDescriptor.getName()); |
| if (!added) { |
| logger.debug("Dependency for {} is not satisifed because its dependency chain contains a loop: {}", propertyDescriptor, propertiesSeen); |
| return false; |
| } |
| |
| try { |
| for (final PropertyDependency dependency : dependencies) { |
| final String dependencyName = dependency.getPropertyName(); |
| |
| // Check if the property being depended upon has its dependencies satisfied. |
| final PropertyDescriptor dependencyDescriptor = propertyDescriptorLookup.apply(dependencyName); |
| if (dependencyDescriptor == null) { |
| logger.debug("Dependency for {} is not satisfied because it has a dependency on {}, which has no property descriptor", propertyDescriptor, dependencyName); |
| return false; |
| } |
| |
| final PropertyValue propertyValue = getProperty(dependencyDescriptor); |
| final String dependencyValue = propertyValue == null ? dependencyDescriptor.getDefaultValue() : propertyValue.getValue(); |
| if (dependencyValue == null) { |
| logger.debug("Dependency for {} is not satisfied because it has a dependency on {}, which has a null value", propertyDescriptor, dependencyName); |
| return false; |
| } |
| |
| final boolean transitiveDependencySatisfied = isDependencySatisfied(dependencyDescriptor, propertyDescriptorLookup, propertiesSeen); |
| if (!transitiveDependencySatisfied) { |
| logger.debug("Dependency for {} is not satisfied because it has a dependency on {} and {} does not have its dependencies satisfied", |
| propertyDescriptor, dependencyName, dependencyName); |
| return false; |
| } |
| |
| // Check if the property being depended upon is set to one of the values that satisfies this dependency. |
| // If the dependency has no dependent values, then any non-null value satisfies the dependency. |
| // The value is already known to be non-null due to the check above. |
| final Set<String> dependentValues = dependency.getDependentValues(); |
| if (dependentValues != null && !dependentValues.contains(dependencyValue)) { |
| logger.debug("Dependency for {} is not satisfied because it depends on {}, which has a value of {}. Dependent values = {}", |
| propertyDescriptor, dependencyName, dependencyValue, dependentValues); |
| return false; |
| } |
| } |
| |
| logger.debug("All dependencies for {} are satisfied", propertyDescriptor); |
| |
| return true; |
| } finally { |
| propertiesSeen.remove(propertyDescriptor.getName()); |
| } |
| } |
| } |