如何创建Ant任务嵌套元素？

问题描述

是否有可能对任何Ant任务创建嵌套元素。对于例如。

Is it possible to create the nested element for any ant task. For e.g.

<copy todir="../backup/dir">
    <fileset dir="src_dir"/>
    <filterset>
      <filter token="TITLE" value="Foo Bar"/>
    </filterset>
</copy>

下面的任务复制我们有嵌套的元素作为 filterset 。现在，我想创建自己的嵌套元素的 encryptfilterset 的任务复制

Here for the task copy we are having nested element as filterset. Now, i would like to create my own nested element encryptfilterset for the task copy.

<copy todir="../backup/dir">
    <fileset dir="src_dir"/>
    <encryptfilterset>
      <filter token="TITLE" value="Foo Bar"/>
    </encryptfilterset>
</copy>

我们怎样才能做到这一点？

How can we do that?

推荐答案

我们必须扩展现有的任务来创建 CustomTask 现在，支持自定义嵌套元素XYZ创建在新的类中的方法

we have to extend the existing task to create CustomTask and now to support the custom nested element XYZ create a method in your new class

公共XYZ createXYZ（）; 结果
或结果
 公共无效addXYZ（XYZ OBJ）结果
或结果
 公共无效addXYZ（XYZ OBJ）

<taskdef name="CustomTask" classname="com.ant.task.Customtask">
        <classpath>
            <path location="lib/"/>
        </classpath>
    </taskdef>

<typedef name="XYZ" classname="com.ant.type.XYZ" >
        <classpath>
            <path location="lib/"/>
        </classpath>
    </typedef>


    <target name="MyTarget" >
            <CustomTask>
                <XYZ></XYZ>
            </CopyEncrypted>
        </target>

---

所以我的文件看起来像： -

---

So my files looked like:-

public class CopyEncrypted extends Copy {

    public EncryptionAwareFilterSet createEncryptionAwareFilterSet()
    {
        EncryptionAwareFilterSet eafilterSet = new EncryptionAwareFilterSet();
        getFilterSets().addElement( eafilterSet );
        return eafilterSet;
    }
}


public class EncryptionAwareFilterSet extends FilterSet{

    @Override
    public synchronized void readFiltersFromFile(File file)
            throws BuildException {
        log("EncryptionAwareFilterSet::reading filters",0);
        super.readFiltersFromFile(file);

        Vector<Filter> filts = getFilters();
        for (Iterator iterator = filts.iterator(); iterator.hasNext();) {
            Filter filter = (Filter) iterator.next();
            if ( filter.getToken().equalsIgnoreCase( "PASSWORD" ) ){
                filter.setValue( Encryptor.getEncryptedValue ( filter.getValue() )  );
            }
        }
    }
}

---

的build.xml

---

build.xml

<target name="encrypted-copy" >
        <CopyEncrypted todir="dist/xyz/config" overwrite="true">
            <fileset dir="config"/>
            <encryptionAwareFilterSet>
                <filtersfile file="conf/properties/blah-blah.properties" />
            </encryptionAwareFilterSet>
        </CopyEncrypted>
    </target>

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