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Java > Open Source Codes > com > sun > org > apache > xml > internal > security > transforms > implementations > TransformC14NExclusive


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package com.sun.org.apache.xml.internal.security.transforms.implementations;
18
19
20
21 import java.io.OutputStream JavaDoc;
22
23 import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException;
24 import com.sun.org.apache.xml.internal.security.c14n.implementations.Canonicalizer20010315ExclOmitComments;
25 import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
26 import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
27 import com.sun.org.apache.xml.internal.security.transforms.TransformSpi;
28 import com.sun.org.apache.xml.internal.security.transforms.Transforms;
29 import com.sun.org.apache.xml.internal.security.transforms.params.InclusiveNamespaces;
30 import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
31 import org.w3c.dom.Element JavaDoc;
32
33
34 /**
35  * Class TransformC14NExclusive
36  *
37  * @author $Author: raul $
38  * @version $Revision: 1.11 $
39  */
40 public class TransformC14NExclusive extends TransformSpi {
41
42    /** Field implementedTransformURI */
43    public static final String JavaDoc implementedTransformURI =
44       Transforms.TRANSFORM_C14N_EXCL_OMIT_COMMENTS;
45
46
47    /**
48     * Method engineGetURI
49     *
50     * @inheritDoc
51     */
52    protected String JavaDoc engineGetURI() {
53       return implementedTransformURI;
54    }
55
56    /**
57     * Method enginePerformTransform
58     *
59     * @param input
60     * @return the transformed of the input
61     * @throws CanonicalizationException
62     */
63    protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input)
64            throws CanonicalizationException {
65         return enginePerformTransform(input,null);
66    }
67     protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input,OutputStream JavaDoc os)
68     throws CanonicalizationException {
69       try {
70          String JavaDoc inclusiveNamespaces = null;
71
72          if (this._transformObject
73                  .length(InclusiveNamespaces
74                     .ExclusiveCanonicalizationNamespace, InclusiveNamespaces
75                     ._TAG_EC_INCLUSIVENAMESPACES) == 1) {
76             Element JavaDoc inclusiveElement =
77                 XMLUtils.selectNode(
78                this._transformObject.getElement().getFirstChild(),
79                   InclusiveNamespaces.ExclusiveCanonicalizationNamespace,
80                   InclusiveNamespaces._TAG_EC_INCLUSIVENAMESPACES,0);
81
82             inclusiveNamespaces = new InclusiveNamespaces(inclusiveElement,
83                     this._transformObject.getBaseURI()).getInclusiveNamespaces();
84          }
85
86          Canonicalizer20010315ExclOmitComments c14n =
87             new Canonicalizer20010315ExclOmitComments();
88          if (os!=null) {
89             c14n.setWriter(os);
90          }
91          byte []result;
92          input.setNeedsToBeExpanded(true);
93          result =c14n.engineCanonicalize(input, inclusiveNamespaces);
94               
95          XMLSignatureInput output=new XMLSignatureInput(result);
96          if (os!=null) {
97             output.setOutputStream(os);
98          }
99          return output;
100       } catch (XMLSecurityException ex) {
101          throw new CanonicalizationException("empty", ex);
102       }
103    }
104 }
105
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