/*
* Copyright 2002-2017 the original author or authors.
*
* 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.springframework.context.index;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
/**
* Used by {@link CandidateComponentsIndexer} to collect {@link CandidateComponentsMetadata}.
*
* @author Stephane Nicoll
* @since 5.0
*/
class MetadataCollector {
private final List<ItemMetadata> metadataItems = new ArrayList<ItemMetadata>();
private final ProcessingEnvironment processingEnvironment;
private final CandidateComponentsMetadata previousMetadata;
private final TypeHelper typeHelper;
private final Set<String> processedSourceTypes = new HashSet<String>();
/**
* Create a new {@code MetadataProcessor} instance.
* @param processingEnvironment The processing environment of the build
* @param previousMetadata Any previous metadata or {@code null}
*/
public MetadataCollector(ProcessingEnvironment processingEnvironment,
CandidateComponentsMetadata previousMetadata) {
this.processingEnvironment = processingEnvironment;
this.previousMetadata = previousMetadata;
this.typeHelper = new TypeHelper(processingEnvironment);
}
public void processing(RoundEnvironment roundEnv) {
for (Element element : roundEnv.getRootElements()) {
markAsProcessed(element);
}
}
private void markAsProcessed(Element element) {
if (element instanceof TypeElement) {
this.processedSourceTypes.add(this.typeHelper.getType(element));
}
}
public void add(ItemMetadata metadata) {
this.metadataItems.add(metadata);
}
public CandidateComponentsMetadata getMetadata() {
CandidateComponentsMetadata metadata = new CandidateComponentsMetadata();
for (ItemMetadata item : this.metadataItems) {
metadata.add(item);
}
if (this.previousMetadata != null) {
List<ItemMetadata> items = this.previousMetadata.getItems();
for (ItemMetadata item : items) {
if (shouldBeMerged(item)) {
metadata.add(item);
}
}
}
return metadata;
}
private boolean shouldBeMerged(ItemMetadata itemMetadata) {
String sourceType = itemMetadata.getType();
return (sourceType != null && !deletedInCurrentBuild(sourceType)
&& !processedInCurrentBuild(sourceType));
}
private boolean deletedInCurrentBuild(String sourceType) {
return this.processingEnvironment.getElementUtils()
.getTypeElement(sourceType) == null;
}
private boolean processedInCurrentBuild(String sourceType) {
return this.processedSourceTypes.contains(sourceType);
}
}