Compile and test with combinations of context instances and concrete strategy instances in Java

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Example
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The example in the code sketch presented in the introduction to this refactoring deals with calculating capital for three different kinds of bank loans: a term loan, a revolver, and an advised line It contains a fair amount of conditional logic used in performing the capital calculation, though it's less complicated and contains less conditional logic than was present in the original code, which handled capital
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calculations for seven distinct loan types In this example, we'll see how Loan's method for calculating capital can be strategized (ie, delegated to a Strategy object) As you study the example, you may wonder why Loan wasn't simply subclassed to support the different styles of capital calculations That would not have been a good design choice because the application that used Loan needed to accomplish the following Calculate capital for loans in a variety of ways Had there been one Loan subclass for each type of capital calculation, theLoan hierarchy would have been overburdened with subclasses, as shown in the diagram on the following page
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Change a loan's capital calculation at runtime, without changing the class type of the Loan instance This is easier to do when it involves exchanging a Loan object's Strategy instance for another Strategy instance, rather than changing the wholeLoan object from one subclass of Loan into another
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Now let's look at some code The Loan class, which plays the role of the context (as defined in the Mechanics section), contains a calculation method called capital(): public class Loan public double capital() { if (expiry == null && maturity != null) return commitment * duration() * riskFactor(); if (expiry != null && maturity == null) { if (getUnusedPercentage() != 10) return commitment * getUnusedPercentage() * duration() * riskFactor(); else return (outstandingRiskAmount() * duration() * riskFactor()) + (unusedRiskAmount() * duration() * unusedRiskFactor()); } return 00; }
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Much of the conditional logic deals with figuring out whether the loan is a term loan, a revolver, or an advised line For example, a null expiry date and a non-null maturity date indicate a term loan That code doesn't reveal its intentions well, does it Once the code figures out what type of loan it has, a specific capital calculation can be performed There are three such capital calculations, one for each loan type All three of these calculations rely on the following helper methods: public class Loan private double outstandingRiskAmount() { return outstanding; } private double unusedRiskAmount() { return (commitment - outstanding); }
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public double duration() { if (expiry == null && maturity != null) return weightedAverageDuration(); else if (expiry != null && maturity == null) return yearsTo(expiry); return 00; } private double weightedAverageDuration() { double duration = 00; double weightedAverage = 00; double sumOfPayments = 00; Iterator loanPayments = paymentsiterator(); while (loanPaymentshasNext()) { Payment payment = (Payment)loanPaymentsnext(); sumOfPayments += paymentamount(); weightedAverage += yearsTo(paymentdate()) * paymentamount(); } if (commitment != 00) duration = weightedAverage / sumOfPayments; return duration; } private double yearsTo(Date endDate) { Date beginDate = (today == null start : today); return ((endDategetTime() - beginDategetTime()) / MILLIS_PER_DAY) / DAYS_PER_YEAR; } private double riskFactor() { return RiskFactorgetFactors()forRating(riskRating); } private double unusedRiskFactor() { return UnusedRiskFactorsgetFactors()forRating(riskRating); }
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The Loan class can be simplified by extracting specific calculation logic into individual strategy classes, one for each loan type For example, the method weightedAverageDuration() is used only to calculate capital for a term loan I'll now proceed with the refactoring to Strategy 1 Since the strategy I'd like to create will handle the calculation of a loan's capital, I create a class called CapitalStrategy
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public class CapitalStrategy { }
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2 Now I apply Move Method [F] to move the capital() calculation to CapitalStrategy This step involves leaving a simple version of capital() on Loan, which will delegate to an instance of CapitalStrategy The first step is to declare capital() in CapitalStrategy: public class CapitalStrategy {
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public double capital() { return 00; }
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Now I need to copy code from Loan to CapitalStrategy Of course, this will involve copying the capital() method The mechanics for Move Method [F] encourage me to move whatever features (data or methods) are used solely by capital() I begin by copying the capital() method and then see what else I can easily move from Loan to CapitalStrategy I end up with the following code, which doesn't compile at the moment: public class CapitalStrategy
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public double capital() { // copied from Loan if (expiry == null && maturity != null) return commitment * duration() * riskFactor(); if (expiry != null && maturity == null) { if (getUnusedPercentage() != 10) return commitment * getUnusedPercentage() * duration() * riskFactor(); else return (outstandingRiskAmount() * duration() * riskFactor()) + (unusedRiskAmount() * duration() * unusedRiskFactor()); } return 00; }
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private double riskFactor() {
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