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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.xmlgraphics.io;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import javax.xml.transform.Source;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.URIResolver;
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* An adapter between {@link URIResolver} to {@link ResourceResolver}. This adapter allows users
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* to utilize the resolvers from the XML library for resource acquisition.
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public class URIResolverAdapter implements ResourceResolver {
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private final URIResolver resolver;
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* @param resolver the desired {@link URIResolver}
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public URIResolverAdapter(URIResolver resolver) {
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this.resolver = resolver;
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public Resource getResource(URI uri) throws IOException {
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Source src = resolver.resolve(uri.toASCIIString(), null);
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InputStream resourceStream = XmlSourceUtil.getInputStream(src);
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if (resourceStream == null) {
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URL url = new URL(src.getSystemId());
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resourceStream = url.openStream();
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return new Resource(resourceStream);
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} catch (TransformerException e) {
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throw new IOException(e.getMessage());
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public OutputStream getOutputStream(URI uri) throws IOException {
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Source src = resolver.resolve(uri.toASCIIString(), null);
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return new URL(src.getSystemId()).openConnection().getOutputStream();
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} catch (TransformerException te) {
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throw new IOException(te.getMessage());