modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/WireBuilderImpl.java [753:783]:
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    private boolean validateMultiplicity(Multiplicity multiplicity, List<EndpointReference> endpointReferences) {

        // In some tests multiplicity is not set
        if (multiplicity == null) {
            return true;
        }

        // Count targets
        int count = endpointReferences.size();

        switch (multiplicity) {
            case ZERO_N:
                break;
            case ZERO_ONE:
                if (count > 1) {
                    return false;
                }
                break;
            case ONE_ONE:
                if (count != 1) {
                    return false;
                }
                break;
            case ONE_N:
                if (count < 1) {
                    return false;
                }
                break;
        }
        return true;
    }    
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modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/EndpointReferenceBuilderImpl.java [560:590]:
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    private boolean validateMultiplicity(Multiplicity multiplicity, List<EndpointReference> endpointReferences) {

        // In some tests multiplicity is not set
        if (multiplicity == null) {
            return true;
        }

        // Count targets
        int count = endpointReferences.size();

        switch (multiplicity) {
            case ZERO_N:
                break;
            case ZERO_ONE:
                if (count > 1) {
                    return false;
                }
                break;
            case ONE_ONE:
                if (count != 1) {
                    return false;
                }
                break;
            case ONE_N:
                if (count < 1) {
                    return false;
                }
                break;
        }
        return true;
    }    
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