DefaultTaskOutputs.java 文件源码

@Override
public SortedSet<TaskOutputFilePropertySpec> getFileProperties() {
    if (fileProperties == null) {
        TaskPropertyUtils.ensurePropertiesHaveNames(filePropertiesInternal);
        Iterator<TaskOutputFilePropertySpec> flattenedProperties = Iterators.concat(Iterables.transform(filePropertiesInternal, new Function<TaskPropertySpec, Iterator<? extends TaskOutputFilePropertySpec>>() {
            @Override
            public Iterator<? extends TaskOutputFilePropertySpec> apply(TaskPropertySpec propertySpec) {
                if (propertySpec instanceof CompositeTaskOutputPropertySpec) {
                    return ((CompositeTaskOutputPropertySpec) propertySpec).resolveToOutputProperties();
                } else {
                    return Iterators.singletonIterator((TaskOutputFilePropertySpec) propertySpec);
                }
            }
        }).iterator());
        fileProperties = TaskPropertyUtils.collectFileProperties("output", flattenedProperties);
    }
    return fileProperties;
}