| /* |
| * 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.sling.jcr.resource.internal.helper.jcr; |
| |
| |
| |
| import org.apache.sling.api.resource.external.ExternalizableInputStream; |
| import org.jetbrains.annotations.NotNull; |
| |
| import javax.jcr.Property; |
| import javax.jcr.RepositoryException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URI; |
| |
| /** |
| * A lazy initialised input stream wrapping a JCR Property that also has a Public URI representation. The |
| * InputStream will be initialised when the first byte is read from the input stream so that the URI |
| * can be used without consuming any local IO resources. |
| * |
| * If a non any other form of URI is require, (ie Internal) then the URIProvider should be used directly. This |
| * class is written intentionally to *only* support URIs that may be used where the client is external and/or internal. |
| */ |
| public class JcrExternalizableInputStream extends InputStream implements ExternalizableInputStream { |
| |
| private final Property data; |
| private final URI uri; |
| private InputStream inputStream; |
| |
| /** |
| * Construct the InputStream wrapping this existing stream and |
| * using a public URI |
| * @param data the binary JCR property. |
| * @param uri a public URI. |
| */ |
| JcrExternalizableInputStream(Property data, URI uri) { |
| this.data = data; |
| this.uri = uri; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return getInputStream().read(); |
| } |
| |
| private @NotNull InputStream getInputStream() throws IOException { |
| if (inputStream == null) { |
| try { |
| // perform lazy initialisation so that a consumer of |
| // this object can use the getURI method without triggering |
| // local IO operations. A DataSource implementation that |
| // converts the JCR Property to an InputStream might make a local |
| // copy. This avoids that IO operation. |
| inputStream = data.getBinary().getStream(); |
| } catch (RepositoryException e) { |
| throw new IOException(e.getMessage(), e); |
| } |
| } |
| return inputStream; |
| } |
| |
| @Override |
| public @NotNull URI getURI() { |
| return uri; |
| } |
| |
| } |