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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Xml.Serialization;
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using Unity.Injection;
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namespace Implab.ServiceHost.Unity {
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public class InjectionParameterBuilder {
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readonly TypeResolver m_resolver;
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public Type DefaultType { get; private set; }
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public Type ValueType { get; private set; }
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object m_value;
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public object Value {
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get {
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if (!ValueSpecified)
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throw new InvalidOperationException("The regular value must be set (dependency or array are not situable in this context)");
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return m_value;
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}
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}
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public bool ValueSpecified { get; private set; }
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InjectionParameterValue m_injection;
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public InjectionParameterValue Injection {
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get {
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if (m_injection == null)
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throw new InvalidOperationException("The injection parameter is not specified");
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return m_injection;
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}
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}
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public bool InjectionSpecified {
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get { return m_injection != null; }
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}
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internal InjectionParameterBuilder(TypeResolver resolver, Type defaultType) {
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m_resolver = resolver;
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DefaultType = defaultType;
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}
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public Type ResolveInjectedValueType(string typeSpec) {
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if (string.IsNullOrEmpty(typeSpec)) {
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if (DefaultType == null)
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throw new Exception("The type must be specified");
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return DefaultType;
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}
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return m_resolver.Resolve(typeSpec, true);
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}
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public Type ResolveType(string typeSpec) {
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return string.IsNullOrEmpty(typeSpec) ? null : m_resolver.Resolve(typeSpec, true);
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}
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public void SetValue(Type type, object value) {
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Safe.ArgumentNotNull(type, nameof(type));
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ValueType = type;
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m_value = value;
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ValueSpecified = true;
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m_injection = new InjectionParameter(type, value);
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}
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public void SetDependency(Type type, string name, bool optional) {
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Safe.ArgumentNotNull(type, nameof(type));
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ValueType = type;
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ValueSpecified = false;
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m_value = null;
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m_injection = optional ? (InjectionParameterValue)new OptionalParameter(type, name) : new ResolvedParameter(type, name);
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}
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internal void Visit(ArrayParameterElement arrayParameter) {
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Type itemsType = null;
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var arrayType = string.IsNullOrEmpty(arrayParameter.TypeName) ? null : ResolveType(arrayParameter.TypeName);
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if (arrayType == null)
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arrayType = DefaultType;
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if (!string.IsNullOrEmpty(arrayParameter.ItemsType)) {
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itemsType = ResolveType(arrayParameter.ItemsType);
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arrayType = itemsType.MakeArrayType();
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} else {
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itemsType = GetItemsType(arrayType);
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}
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if (itemsType == null)
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throw new Exception("Failed to determine array elements type");
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InjectionParameterValue[] injections = (arrayParameter.Items ?? new InjectionParameterElement[0])
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.Select(x => {
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var builder = new InjectionParameterBuilder(m_resolver, itemsType);
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x.Visit(builder);
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return builder.Injection;
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})
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.ToArray();
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var array = itemsType.IsGenericParameter ?
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(InjectionParameterValue)new GenericResolvedArrayParameter(itemsType.Name, injections) :
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new ResolvedArrayParameter(itemsType, injections);
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ValueType = arrayType;
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m_value = null;
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ValueSpecified = false;
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m_injection = array;
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}
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Type GetItemsType(Type collectionType) {
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if (collectionType == null)
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return null;
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Type itemsType = null;
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if (collectionType.GetGenericTypeDefinition() == typeof(IEnumerable<>)) {
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itemsType = collectionType.GetGenericArguments()[0];
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} else if (collectionType == typeof(IEnumerable)) {
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itemsType = typeof(object);
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} else {
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itemsType = collectionType.GetInterface(typeof(IEnumerable<>).FullName)?.GetGenericArguments()[0];
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}
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return itemsType;
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}
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}
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}
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