Java tutorial
/* * Copyright 2011 the original author or authors. * * Licensed 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.gradle.internal.resource; import org.apache.commons.io.IOUtils; import org.gradle.api.Action; import org.gradle.api.Transformer; import java.io.*; public abstract class AbstractExternalResource implements ExternalResource { /** * Opens an unbuffered input stream to read the contents of this resource. */ protected abstract InputStream openStream() throws IOException; private InputStream openBuffered() { try { return new BufferedInputStream(openStream()); } catch (FileNotFoundException e) { throw new ResourceNotFoundException(getURI(), String.format("Could not get resource '%s' as it does not exist.", getURI()), e); } catch (IOException e) { throw ResourceException.getFailed(getURI(), e); } } private void close(InputStream input) { try { input.close(); } catch (IOException e) { throw ResourceException.getFailed(getURI(), e); } } public String getName() { return getURI().toString(); } public void writeTo(File destination) { try { FileOutputStream output = new FileOutputStream(destination); try { writeTo(output); } finally { output.close(); } } catch (Exception e) { throw ResourceException.getFailed(getURI(), e); } } public void writeTo(OutputStream output) { try { InputStream input = openStream(); try { IOUtils.copyLarge(input, output); } finally { input.close(); } } catch (Exception e) { throw ResourceException.getFailed(getURI(), e); } } public void withContent(Action<? super InputStream> readAction) { InputStream input = openBuffered(); try { readAction.execute(input); } finally { close(input); } } public <T> T withContent(Transformer<? extends T, ? super InputStream> readAction) { InputStream input = openBuffered(); try { return readAction.transform(input); } finally { close(input); } } @Override public <T> T withContent(ContentAction<? extends T> readAction) { InputStream input = openBuffered(); try { try { return readAction.execute(input, getMetaData()); } catch (IOException e) { throw ResourceException.getFailed(getURI(), e); } } finally { close(input); } } public void close() { } }