/**
 * Thrown when an attempt is made to read the value of a model element that is not readable at the time.
 */
@Incubating
public class WriteOnlyModelViewException extends GradleException {

    public WriteOnlyModelViewException(String property, ModelPath path, ModelType<?> type, ModelRuleDescriptor ruleDescriptor) {
        super(createMessage(property, path, type, ruleDescriptor));
    }

    @Override
    public void assertCanReadChildren() {
        if (!canReadChildren) {
            throw new WriteOnlyModelViewException(null, path, type, ruleDescriptor);
        }
    }

    @Override
    public void assertCanReadChild(String name) {
        if (!canReadChildren) {
            throw new WriteOnlyModelViewException(name, path, type, ruleDescriptor);
        }
    }

    @Override
    public boolean isCanMutate() {

        e.cause instanceof WriteOnlyModelViewException
    }

    def "cannot read size in mutative method"() {
        when:
        mutate {
            size()
        }
        realizeAsModelMap()

        then:
        def e = thrown ModelRuleExecutionException
        e.cause instanceof WriteOnlyModelViewException
    }

    def "can put existing unmanaged instance"() {