44 lines
1.4 KiB
C#
44 lines
1.4 KiB
C#
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using DTT.Utils.Exceptions;
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using System;
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namespace DTT.Utils.Optimization
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{
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/// <summary>
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/// Provides an abstract implementation of a class that stores
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/// values and their constructor to create them the first time
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/// they are used.
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/// </summary>
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/// <typeparam name="TKey">The type of key.</typeparam>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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public abstract class LazyDictionaryBase<TKey, TValue>
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{
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/// <summary>
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/// The accessor to the collection. The argument should always be the name
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/// of the property.
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/// </summary>
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/// <param name="key">The name of the key.</param>
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/// <returns>The collection value.</returns>
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public TValue this[TKey key]
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{
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get
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{
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try
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{
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return GetValue(key);
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}
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catch (Exception e)
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{
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throw new LazyDictionaryException($"Failed returning item for key {key}.", e);
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}
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}
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}
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/// <summary>
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/// Should return the item value based on the given key.
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/// </summary>
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/// <param name="key">The key to get the value for.</param>
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/// <returns>The item value.</returns>
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protected abstract TValue GetValue(TKey key);
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}
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}
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