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+/*
+ * Copyright 2003 Federal Chancellery Austria
+ * MOA-ID has been developed in a cooperation between BRZ, the Federal
+ * Chancellery Austria - ICT staff unit, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+
+
+package at.gv.egovernment.moa.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+
+/**
+ * Utility methods for streams.
+ *
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public class StreamUtils {
+
+ /**
+ * Compare the contents of two <code>InputStream</code>s.
+ *
+ * @param is1 The 1st <code>InputStream</code> to compare.
+ * @param is2 The 2nd <code>InputStream</code> to compare.
+ * @return boolean <code>true</code>, if both streams contain the exactly the
+ * same content, <code>false</code> otherwise.
+ * @throws IOException An error occurred reading one of the streams.
+ */
+ public static boolean compareStreams(InputStream is1, InputStream is2)
+ throws IOException {
+
+ byte[] buf1 = new byte[256];
+ byte[] buf2 = new byte[256];
+ int length1;
+ int length2;
+
+ try {
+ while (true) {
+ length1 = is1.read(buf1);
+ length2 = is2.read(buf2);
+
+ if (length1 != length2) {
+ return false;
+ }
+ if (length1 <= 0) {
+ return true;
+ }
+ if (!compareBytes(buf1, buf2, length1)) {
+ return false;
+ }
+ }
+ } catch (IOException e) {
+ throw e;
+ } finally {
+ // close both streams
+ try {
+ is1.close();
+ is2.close();
+ } catch (IOException e) {
+ // ignore this
+ }
+ }
+ }
+
+ /**
+ * Compare two byte arrays, up to a given maximum length.
+ *
+ * @param b1 1st byte array to compare.
+ * @param b2 2nd byte array to compare.
+ * @param length The maximum number of bytes to compare.
+ * @return <code>true</code>, if the byte arrays are equal, <code>false</code>
+ * otherwise.
+ */
+ private static boolean compareBytes(byte[] b1, byte[] b2, int length) {
+ if (b1.length != b2.length) {
+ return false;
+ }
+
+ for (int i = 0; i < b1.length && i < length; i++) {
+ if (b1[i] != b2[i]) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Reads a byte array from a stream.
+ * @param in The <code>InputStream</code> to read.
+ * @return The bytes contained in the given <code>InputStream</code>.
+ * @throws IOException on any exception thrown
+ */
+ public static byte[] readStream(InputStream in) throws IOException {
+
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ copyStream(in, out, null);
+
+ /*
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ int b;
+ while ((b = in.read()) >= 0)
+ out.write(b);
+
+ */
+ in.close();
+ return out.toByteArray();
+ }
+
+ /**
+ * Reads a <code>String</code> from a stream, using given encoding.
+ * @param in The <code>InputStream</code> to read.
+ * @param encoding The character encoding to use for converting the bytes
+ * of the <code>InputStream</code> into a <code>String</code>.
+ * @return The content of the given <code>InputStream</code> converted into
+ * a <code>String</code>.
+ * @throws IOException on any exception thrown
+ */
+ public static String readStream(InputStream in, String encoding) throws IOException {
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ copyStream(in, out, null);
+
+ /*
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ int b;
+ while ((b = in.read()) >= 0)
+ out.write(b);
+ */
+ in.close();
+ return out.toString(encoding);
+ }
+
+ /**
+ * Reads all data (until EOF is reached) from the given source to the
+ * destination stream. If the destination stream is null, all data is dropped.
+ * It uses the given buffer to read data and forward it. If the buffer is
+ * null, this method allocates a buffer.
+ *
+ * @param source The stream providing the data.
+ * @param destination The stream that takes the data. If this is null, all
+ * data from source will be read and discarded.
+ * @param buffer The buffer to use for forwarding. If it is null, the method
+ * allocates a buffer.
+ * @exception IOException If reading from the source or writing to the
+ * destination fails.
+ */
+ private static void copyStream(InputStream source, OutputStream destination, byte[] buffer) throws IOException {
+ if (source == null) {
+ throw new NullPointerException("Argument \"source\" must not be null.");
+ }
+ if (buffer == null) {
+ buffer = new byte[8192];
+ }
+
+ if (destination != null) {
+ int bytesRead;
+ while ((bytesRead = source.read(buffer)) >= 0) {
+ destination.write(buffer, 0, bytesRead);
+ }
+ } else {
+ while (source.read(buffer) >= 0);
+ }
+ }
+
+ /**
+ * Gets the stack trace of the <code>Throwable</code> passed in as a string.
+ * @param t The <code>Throwable</code>.
+ * @return a String representing the stack trace of the <code>Throwable</code>.
+ */
+ public static String getStackTraceAsString(Throwable t)
+ {
+ ByteArrayOutputStream stackTraceBIS = new ByteArrayOutputStream();
+ t.printStackTrace(new PrintStream(stackTraceBIS));
+ return new String(stackTraceBIS.toByteArray());
+ }
+}