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- /* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You 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 org.apache.poi.openxml4j.opc;
-
- import java.io.FilterOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
-
- import javax.xml.transform.OutputKeys;
- import javax.xml.transform.Result;
- import javax.xml.transform.Source;
- import javax.xml.transform.Transformer;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.dom.DOMSource;
- import javax.xml.transform.stream.StreamResult;
-
- import org.apache.poi.util.IOUtils;
- import org.apache.poi.util.XMLHelper;
- import org.w3c.dom.Document;
-
- public final class StreamHelper {
-
- private StreamHelper() {
- // Do nothing
- }
-
- /**
- * Save the document object in the specified output stream.
- *
- * @param xmlContent
- * The XML document.
- * @param outStream
- * The OutputStream in which the XML document will be written.
- * @return <b>true</b> if the xml is successfully written in the stream,
- * else <b>false</b>.
- */
- public static boolean saveXmlInStream(Document xmlContent,
- OutputStream outStream) {
- try {
- Transformer trans = XMLHelper.newTransformer();
- Source xmlSource = new DOMSource(xmlContent);
- // prevent close of stream by transformer:
- Result outputTarget = new StreamResult(new FilterOutputStream(
- outStream) {
- @Override
- public void write(byte[] b, int off, int len)
- throws IOException {
- out.write(b, off, len);
- }
-
- @Override
- public void close() throws IOException {
- out.flush(); // only flush, don't close!
- }
- });
- // xmlContent.setXmlStandalone(true);
- trans.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
- // don't indent xml documents, the indent will cause errors in calculating the xml signature
- // because of different handling of linebreaks in Windows/Unix
- trans.setOutputProperty(OutputKeys.INDENT, "no");
- trans.setOutputProperty(OutputKeys.STANDALONE, "yes");
- trans.transform(xmlSource, outputTarget);
- } catch (TransformerException e) {
- return false;
- }
- return true;
- }
-
- /**
- * Copy the input stream into the output stream.
- *
- * @param inStream
- * The source stream.
- * @param outStream
- * The destination stream.
- * @return <b>true</b> if the operation succeed, else return <b>false</b>.
- */
- public static boolean copyStream(InputStream inStream, OutputStream outStream) {
- try {
- IOUtils.copy(inStream, outStream);
- return true;
- } catch (Exception e) {
- return false;
- }
- }
- }
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