84 lines
2.7 KiB
C#
84 lines
2.7 KiB
C#
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// ****************************************************************
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// Copyright 2007, Charlie Poole
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// This is free software licensed under the NUnit license. You may
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// obtain a copy of the license at http://nunit.org/?p=license&r=2.4
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// ****************************************************************
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using System;
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using System.Collections;
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using System.Reflection;
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namespace NUnit.Framework.Constraints
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{
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/// <summary>
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/// Summary description for PropertyConstraint.
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/// </summary>
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public class PropertyConstraint : PrefixConstraint
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{
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private string name;
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private object propValue;
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private bool propertyExists;
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/// <summary>
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/// Initializes a new instance of the <see cref="T:PropertyConstraint"/> class.
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/// </summary>
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/// <param name="name">The name.</param>
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/// <param name="baseConstraint">The constraint to apply to the property.</param>
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public PropertyConstraint( string name, Constraint baseConstraint )
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: base( baseConstraint )
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{
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this.name = name;
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}
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/// <summary>
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/// Test whether the constraint is satisfied by a given value
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/// </summary>
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/// <param name="actual">The value to be tested</param>
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/// <returns>True for success, false for failure</returns>
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public override bool Matches(object actual)
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{
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this.actual = actual;
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// TODO: Should be argument exception?
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if ( actual == null ) return false;
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PropertyInfo property = actual.GetType().GetProperty( name,
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BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance );
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this.propertyExists = property != null;
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if ( !propertyExists ) return false;
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if ( baseConstraint == null ) return true;
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propValue = property.GetValue( actual, null );
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return baseConstraint.Matches( propValue );
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}
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/// <summary>
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/// Write the constraint description to a MessageWriter
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/// </summary>
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/// <param name="writer">The writer on which the description is displayed</param>
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public override void WriteDescriptionTo(MessageWriter writer)
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{
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writer.WritePredicate( "Property \"" + name + "\"" );
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if ( baseConstraint != null )
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baseConstraint.WriteDescriptionTo( writer );
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}
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/// <summary>
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/// Write the actual value for a failing constraint test to a
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/// MessageWriter. The default implementation simply writes
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/// the raw value of actual, leaving it to the writer to
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/// perform any formatting.
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/// </summary>
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/// <param name="writer">The writer on which the actual value is displayed</param>
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public override void WriteActualValueTo(MessageWriter writer)
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{
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if ( propertyExists )
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writer.WriteActualValue( propValue );
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else
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writer.WriteActualValue( actual.GetType() );
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}
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}
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}
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