import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
/**
 * @inheritDoc
 */
protected XMLSignatureInput enginePerformTransform(
    XMLSignatureInput input, OutputStream os, Transform transformObject
) throws TransformationException {
    /**
     * If the actual input is an octet stream, then the application MUST
     * convert the octet stream to an XPath node-set suitable for use by
     * Canonical XML with Comments. (A subsequent application of the
     * REQUIRED Canonical XML algorithm would strip away these comments.)
     *
     * ...
     *
     * The evaluation of this expression includes all of the document's nodes
     * (including comments) in the node-set representing the octet stream.
     */

    Node signatureElement = transformObject.getElement();

    signatureElement = searchSignatureElement(signatureElement);
    input.setExcludeNode(signatureElement);
    input.addNodeFilter(new EnvelopedNodeFilter(signatureElement));
    return input;
}
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
/** @inheritDoc */
protected XMLSignatureInput enginePerformTransform(
    XMLSignatureInput input, OutputStream os, Transform transformObject
) throws CanonicalizationException {

    Canonicalizer20010315WithComments c14n = new Canonicalizer20010315WithComments();
    if (os != null) {
        c14n.setWriter(os);
    }

    byte[] result = null;
    result = c14n.engineCanonicalize(input);
    XMLSignatureInput output = new XMLSignatureInput(result);
    if (os != null) {
        output.setOutputStream(os);
    }
    return output;
}
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
protected XMLSignatureInput enginePerformTransform(
    XMLSignatureInput input, OutputStream os, Transform transform
) throws CanonicalizationException {

    Canonicalizer11_WithComments c14n = new Canonicalizer11_WithComments();
    if (os != null) {
        c14n.setWriter(os);
    }

    byte[] result = null;
    result = c14n.engineCanonicalize(input);
    XMLSignatureInput output = new XMLSignatureInput(result);
    if (os != null) {
        output.setOutputStream(os);
    }
    return output;
}
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
public static void main(String[] args) throws Exception {

        File file = new File(BASE);
        URL[] urls = new URL[1];
        urls[0] = file.toURI().toURL();
        URLClassLoader ucl = new URLClassLoader(urls);
        Class<?> c = ucl.loadClass("MyTransform");
        Constructor<?> cons = c.getConstructor(new Class[] {});
        Object o = cons.newInstance();
        // Apache code swallows the ClassNotFoundExc, so we need to
        // check if the Transform has already been registered by registering
        // it again and catching an AlgorithmAlreadyRegisteredExc
        try {
            Transform.register(MyTransform.URI, "MyTransform");
            throw new Exception("ClassLoaderTest failed");
        } catch (AlgorithmAlreadyRegisteredException e) {
            // test passed
        }
    }
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
/** @inheritDoc */
protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input,OutputStream os, Transform _transformObject)
        throws CanonicalizationException {

     Canonicalizer20010315WithComments c14n = new Canonicalizer20010315WithComments();
     if (os!=null) {
             c14n.setWriter( os);
     }

      byte[] result = null;
      result=c14n.engineCanonicalize(input);
      XMLSignatureInput output=new XMLSignatureInput(result);
      if (os!=null) {
             output.setOutputStream(os);
      }
      return output;
}
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
protected XMLSignatureInput enginePerformTransform
    (XMLSignatureInput input, OutputStream os, Transform transform)
    throws CanonicalizationException {

    Canonicalizer11_WithComments c14n = new Canonicalizer11_WithComments();
    if (os != null) {
        c14n.setWriter(os);
    }

    byte[] result = null;
    result = c14n.engineCanonicalize(input);
    XMLSignatureInput output = new XMLSignatureInput(result);
    if (os != null) {
        output.setOutputStream(os);
    }
    return output;
}
 

import com.sun.org.apache.xml.internal.security.transforms.Transform; //导入依赖的package包/类
public static void main(String[] args) throws Exception {

        Transform.init();
        File file = new File(BASE);
        URL[] urls = new URL[1];
        urls[0] = file.toURI().toURL();
        URLClassLoader ucl = new URLClassLoader(urls);
        Class c = ucl.loadClass("MyTransform");
        Constructor cons = c.getConstructor();
        Object o = cons.newInstance();
        // Apache code swallows the ClassNotFoundExc, so we need to
        // check if the Transform has already been registered by registering
        // it again and catching an AlgorithmAlreadyRegisteredExc
        try {
            Transform.register(MyTransform.URI, "MyTransform");
            throw new Exception("ClassLoaderTest failed");
        } catch (AlgorithmAlreadyRegisteredException e) {
            // test passed
        }
    }