57 lines
1.6 KiB
Java
57 lines
1.6 KiB
Java
/*
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* Copyright (C) 2019 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.example.atm;
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import java.math.BigDecimal;
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/**
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* Abstract {@link Command} that expects a single argument that can be converted to {@link
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* BigDecimal}.
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*/
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abstract class BigDecimalCommand extends SingleArgCommand {
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private final Outputter outputter;
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protected BigDecimalCommand(Outputter outputter) {
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this.outputter = outputter;
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}
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@Override
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protected final Result handleArg(String arg) {
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BigDecimal amount = tryParse(arg);
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if (amount == null) {
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outputter.output(arg + " is not a valid number");
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} else if (amount.signum() <= 0) {
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outputter.output("amount must be positive");
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} else {
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handleAmount(amount);
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}
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return Result.handled();
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}
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private static BigDecimal tryParse(String arg) {
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try {
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return new BigDecimal(arg);
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} catch (NumberFormatException e) {
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return null;
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}
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}
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/** Handles the given (positive) {@code amount} of money. */
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protected abstract void handleAmount(BigDecimal amount);
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}
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