Add example application model classes for a PurchaseOrder in a Point-of-Sale (POS) system.

spring-geode/src/test/java/example/app/pos/model/LineItem.java

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+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package example.app.pos.model;
+
+import java.math.BigDecimal;
+
+import org.springframework.util.Assert;
+
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * The {@link LineItem} class models a {@link Product} purchase on a {@link PurchaseOrder}.
+ *
+ * @author John Blum
+ * @since 1.3.0
+ */
+@Getter
+@RequiredArgsConstructor(staticName = "newLineItem")
+@SuppressWarnings("unused")
+public class LineItem {
+
+	@NonNull
+	private Product product;
+
+	private Integer quantity = 1;
+
+	public String getDescription() {
+		return getProduct().getName();
+	}
+
+	public BigDecimal getTotal() {
+		return getUnitPrice().multiply(BigDecimal.valueOf(getQuantity()));
+	}
+
+	public BigDecimal getUnitPrice() {
+		return getProduct().getPrice();
+	}
+
+	public LineItem withQuantity(int quantity) {
+		Assert.isTrue(quantity > 0, "Quantity must be greater than equal to 1");
+		this.quantity = quantity;
+		return this;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Purchasing [%d] of Product [%s]", getQuantity(), getProduct());
+	}
+}

spring-geode/src/test/java/example/app/pos/model/Product.java

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+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package example.app.pos.model;
+
+import java.math.BigDecimal;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.gemfire.mapping.annotation.Region;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+import lombok.ToString;
+
+/**
+ * The {@link Product} class models a physical product for purchase.
+ *
+ * @author John Blum
+ * @see org.springframework.data.annotation.Id
+ * @see org.springframework.data.gemfire.mapping.annotation.Region
+ * @since 1.3.0
+ */
+@Region("Products")
+@Getter
+@ToString(of = "name")
+@EqualsAndHashCode(of = "name")
+@RequiredArgsConstructor(staticName = "newProduct")
+@SuppressWarnings("unused")
+public class Product {
+
+	@Id @NonNull
+	private String name;
+
+	private BigDecimal price;
+
+	public Product havingPrice(BigDecimal price) {
+		this.price = price;
+		return this;
+	}
+}

spring-geode/src/test/java/example/app/pos/model/PurchaseOrder.java

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+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package example.app.pos.model;
+
+import java.math.BigDecimal;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.StreamSupport;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.gemfire.mapping.annotation.Region;
+import org.springframework.lang.NonNull;
+import org.springframework.util.Assert;
+
+import org.jetbrains.annotations.NotNull;
+
+import lombok.Getter;
+
+/**
+ * The {@link PurchaseOrder} class models an actual purchase agreement for {@link Product products}
+ * ordered by a consumer.
+ *
+ * @author John Blum
+ * @see java.lang.Iterable
+ * @see org.springframework.data.annotation.Id
+ * @see org.springframework.data.gemfire.mapping.annotation.Region
+ * @since 1.3.0
+ */
+@Region("PurchaseOrders")
+@SuppressWarnings("unused")
+public class PurchaseOrder implements Iterable<LineItem> {
+
+	@Id @Getter
+	private Long id;
+
+	private final Set<LineItem> lineItems = new LinkedHashSet<>();
+
+	public Optional<LineItem> findBy(String productName) {
+
+		return StreamSupport.stream(this.spliterator(), false)
+			.filter(item -> item.getProduct().getName().equals(productName))
+			.findFirst();
+	}
+
+	public BigDecimal getTotal() {
+
+		return StreamSupport.stream(this.spliterator(), false)
+			.map(LineItem::getTotal)
+			.reduce(BigDecimal::add)
+			.orElse(BigDecimal.ZERO);
+	}
+
+	public PurchaseOrder add(@NonNull LineItem lineItem) {
+
+		Assert.notNull(lineItem, "LineItem must not be null");
+
+		this.lineItems.add(lineItem);
+
+		return this;
+	}
+
+	@NotNull @Override
+	public Iterator<LineItem> iterator() {
+		return Collections.unmodifiableSet(this.lineItems).iterator();
+	}
+
+	public int size() {
+		return this.lineItems.size();
+	}
+}