使用jaxb2-maven-plugin版本2.2生成等于und HashCode

Question

我们使用jaxb2-maven-plugin (版本2.2)，并为每个hashCode生成相等和JaxbObject方法。我们已经分配了一个binding.xjb文件来配置任何东西。

有任何方法来生成这个方法吗？

如果我尝试添加参数-Xequals -XhashCode，则会得到以下异常: unbekannter -Xequals -XhashCode

配置：

<configuration> <arguments>-Xequals -XhashCode</arguments> </configuration>

谢谢!

Answer 1

您可以使用hashCode插件生成JAXB2基础和equals：

<project ...>
    ...
    <build>
        <plugins>
            ...
            <plugin>
                <groupId>org.jvnet.jaxb2.maven2</groupId>
                <artifactId>maven-jaxb2-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <extension>true</extension>
                    <args>
                        <arg>-XsimpleEquals</arg>
                        <arg>-XsimpleHashCode</arg>
                    </args>
                    <plugins>
                        <plugin>
                            <groupId>org.jvnet.jaxb2_commons</groupId>
                            <artifactId>jaxb2-basics</artifactId>
                            <version>...</version>
                        </plugin>
                    </plugins>
                </configuration>
            </plugin>
        </plugins>
    </build>
    ...
</project>

这将生成深度无反射的运行时无关依赖的equals和hashCode方法：

public boolean equals(Object object) {
    if ((object == null)||(this.getClass()!= object.getClass())) {
        return false;
    }
    if (this == object) {
        return true;
    }
    final PurchaseOrderType that = ((PurchaseOrderType) object);
    {
        USAddress leftShipTo;
        leftShipTo = this.getShipTo();
        USAddress rightShipTo;
        rightShipTo = that.getShipTo();
        if (this.shipTo!= null) {
            if (that.shipTo!= null) {
                if (!leftShipTo.equals(rightShipTo)) {
                    return false;
                }
            } else {
                return false;
            }
        } else {
            if (that.shipTo!= null) {
                return false;
            }
        }
    }
    // ...
    return true;
}

public int hashCode() {
    int currentHashCode = 1;
    {
        currentHashCode = (currentHashCode* 31);
        USAddress theShipTo;
        theShipTo = this.getShipTo();
        if (this.shipTo!= null) {
            currentHashCode += theShipTo.hashCode();
        }
    }
    // ...
    return currentHashCode;
}

我个人更喜欢生成“战略性”方法的-Xequals和-XhashCode。“策略”在某种意义上说，这些方法使用传递的策略进行相等或哈希码计算：

public boolean equals(Object object) {
    final EqualsStrategy2 strategy = JAXBEqualsStrategy.INSTANCE2;
    return equals(null, null, object, strategy);
}

public boolean equals(ObjectLocator thisLocator, ObjectLocator thatLocator, Object object, EqualsStrategy2 strategy) {
    if ((object == null)||(this.getClass()!= object.getClass())) {
        return false;
    }
    if (this == object) {
        return true;
    }
    final PurchaseOrderType that = ((PurchaseOrderType) object);
    {
        USAddress lhsShipTo;
        lhsShipTo = this.getShipTo();
        USAddress rhsShipTo;
        rhsShipTo = that.getShipTo();
        if (!strategy.equals(LocatorUtils.property(thisLocator, "shipTo", lhsShipTo), LocatorUtils.property(thatLocator, "shipTo", rhsShipTo), lhsShipTo, rhsShipTo, (this.shipTo!= null), (that.shipTo!= null))) {
            return false;
        }
    }
    // ...
    return true;
}

public int hashCode() {
    final HashCodeStrategy2 strategy = JAXBHashCodeStrategy.INSTANCE2;
    return this.hashCode(null, strategy);
}

public int hashCode(ObjectLocator locator, HashCodeStrategy2 strategy) {
    int currentHashCode = 1;
    {
        USAddress theShipTo;
        theShipTo = this.getShipTo();
        currentHashCode = strategy.hashCode(LocatorUtils.property(locator, "shipTo", theShipTo), currentHashCode, theShipTo, (this.shipTo!= null));
    }
    // ...
    return currentHashCode;
}

策略方法非常酷，因为您可以自定义等式/哈希代码计算--例如，在结构不同的日志中。这是以运行时依赖为代价的。

免责声明：，我是JAXB2基础的作者。