Java example source code file (Cart.java)

This example Java source code file (Cart.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

buyer, cart, class, line_items, lineitem, list, nosuchfieldexception, override, parameterizedtype, reflection, serializedname, string, stringbuilder, suppresswarnings, util, wildcardtype

The Cart.java Java example source code

/*
 * Copyright (C) 2011 Google Inc.
 *
 * 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
 *
 * http://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 com.google.gson.examples.android.model;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.List;

import com.google.gson.annotations.SerializedName;

/**
 * A model object representing a cart that can be posted to an order-processing server
 * 
 * @author Inderjeet Singh
 */
public class Cart {
  public final List<LineItem> lineItems;

  @SerializedName("buyer")
  private final String buyerName;

  private final String creditCard;

  public Cart(List<LineItem> lineItems, String buyerName, String creditCard) {
    this.lineItems = lineItems;
    this.buyerName = buyerName;
    this.creditCard = creditCard;
  }

  public List<LineItem> getLineItems() {
    return lineItems;
  }

  public String getBuyerName() {
    return buyerName;
  }

  public String getCreditCard() {
    return creditCard;
  }

  @Override
  public String toString() {
    StringBuilder itemsText = new StringBuilder();
    boolean first = true;
    if (lineItems != null) {
      try {
        Class<?> fieldType = Cart.class.getField("lineItems").getType();
        System.out.println("LineItems CLASS: " + getSimpleTypeName(fieldType));
      } catch (SecurityException e) {
      } catch (NoSuchFieldException e) {
      }
      for (LineItem item : lineItems) {
        if (first) {
          first = false;
        } else {
          itemsText.append("; ");
        }
        itemsText.append(item);
      }
    }
    return "[BUYER: " + buyerName + "; CC: " + creditCard + "; "
    + "LINE_ITEMS: " + itemsText.toString() + "]";
  }

  @SuppressWarnings("unchecked")
  public static String getSimpleTypeName(Type type) {
    if (type == null) {
      return "null";
    }
    if (type instanceof Class) {
      return ((Class)type).getSimpleName();
    } else if (type instanceof ParameterizedType) {
      ParameterizedType pType = (ParameterizedType) type;
      StringBuilder sb = new StringBuilder(getSimpleTypeName(pType.getRawType()));
      sb.append('<');
      boolean first = true;
      for (Type argumentType : pType.getActualTypeArguments()) {
        if (first) {
          first = false;
        } else {
          sb.append(',');
        }
        sb.append(getSimpleTypeName(argumentType));
      }
      sb.append('>');
      return sb.toString();
    } else if (type instanceof WildcardType) {
      return "?";
    }
    return type.toString();
  }

}