Initial Implementation

src/test/java/de/kosit/validationtool/cmd/CommandLine.java

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+/*
+ * Licensed to the Koordinierungsstelle für IT-Standards (KoSIT) under
+ * one or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  KoSIT 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 de.kosit.validationtool.cmd;
+
+import java.io.*;
+import java.util.List;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.io.output.TeeOutputStream;
+
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Helferlein um Ausgaben auf der Kommandozeile zu testen.
+ * 
+ * @author Andreas Penski
+ */
+public class CommandLine {
+
+    private static ReplaceableOutputStream<ByteArrayOutputStream> out = new ReplaceableOutputStream<>();
+
+    private static ReplaceableOutputStream<ByteArrayOutputStream> error = new ReplaceableOutputStream<>();
+
+    static {
+        // Initialisierung muss vor SL4J's SimpleLogger erfolgen, sonst sind logs nicht erfasst.
+        // deshalb darf diese Klasse kein Log haben
+        System.setOut(new PrintStream(new TeeOutputStream(System.out, out)));
+        System.setErr(new PrintStream(new TeeOutputStream(System.err, error)));
+    }
+
+    public String getOutput() {
+        return new String(out.getOut().toByteArray());
+    }
+
+
+    public String getErrorOutput() {
+        return new String(error.getOut().toByteArray());
+    }
+
+    public List<String> getOutputLines() {
+        return readLines(out.getOut().toByteArray());
+    }
+
+    public List<String> getErrorLines() {
+        return readLines(error.getOut().toByteArray());
+    }
+
+    private List<String> readLines(byte[] bytes) {
+        try ( ByteArrayInputStream in = new ByteArrayInputStream(bytes);
+              Reader r = new InputStreamReader(in) ) {
+
+            return IOUtils.readLines(r);
+        } catch (IOException e) {
+            throw new IllegalStateException("Can not read input");
+        }
+    }
+
+    public void activate() {
+        out.setOut(new ByteArrayOutputStream());
+        error.setOut(new ByteArrayOutputStream());
+
+    }
+
+    public void deactivate() {
+        out.setOut(null);
+        error.setOut(null);
+    }
+
+    /**
+     * Simpler Proxy für {@link OutputStream}, dessen target ausgetauscht werden kann.
+     * 
+     * @param <O> Typ des eigentlichen {@link OutputStream}
+     */
+    private static class ReplaceableOutputStream<O extends OutputStream> extends OutputStream {
+
+        @Getter
+        @Setter
+        private O out;
+
+        public void write(int idx) throws IOException {
+            if (out != null) {
+                this.out.write(idx);
+            }
+        }
+
+        public void write(byte[] bts) throws IOException {
+            if (out != null) {
+                this.out.write(bts);
+            }
+        }
+
+        public void write(byte[] bts, int st, int end) throws IOException {
+            if (out != null) {
+                this.out.write(bts, st, end);
+            }
+        }
+
+        public void flush() throws IOException {
+
+            if (out != null) {
+                this.out.flush();
+            }
+        }
+
+        public void close() throws IOException {
+            if (out != null) {
+                this.out.close();
+            }
+        }
+    }
+
+}