AT&T 2.0.19 Code drop, stage 2

[aaf/authz.git] / cadi / core / src / main / java / org / onap / aaf / cadi / util / JsonOutputStream.java

diff --git a/cadi/core/src/main/java/org/onap/aaf/cadi/util/JsonOutputStream.java b/cadi/core/src/main/java/org/onap/aaf/cadi/util/JsonOutputStream.java
new file mode 100644 (file)
index 0000000..7b04942
--- /dev/null
+++ b/cadi/core/src/main/java/org/onap/aaf/cadi/util/JsonOutputStream.java
@@ -0,0 +1,89 @@
+/**
+ * ============LICENSE_START====================================================
+ * org.onap.aaf
+ * ===========================================================================
+ * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
+ * ===========================================================================
+ * 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.
+ * ============LICENSE_END====================================================
+ *
+ */
+
+package org.onap.aaf.cadi.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class JsonOutputStream extends OutputStream {
+       private static final byte[] TWO_SPACE = "  ".getBytes();
+       private OutputStream os;
+       private boolean closeable;
+       private int indent = 0;
+       private int prev,ret=0;
+
+       public JsonOutputStream(OutputStream os) {
+               // Don't close these, or dire consequences.
+               closeable = !os.equals(System.out) && !os.equals(System.err);
+               this.os = os;
+       }
+
+       @Override
+       public void write(int b) throws IOException {
+               if(ret=='\n') {
+                       ret = 0;
+                       if(prev!=',' || (b!='{' && b!='[')) {
+                               os.write('\n');
+                               for(int i=0;i<indent;++i) {
+                                       os.write(TWO_SPACE);
+                               }
+                       }
+               }
+               switch(b) {
+                       case '{':
+                       case '[':       
+                                       ret = '\n';
+                                       ++indent;
+                                       break;
+                       case '}':
+                       case ']': 
+                                       --indent;
+                                       os.write('\n');
+                                       for(int i=0;i<indent;++i) {
+                                               os.write(TWO_SPACE);
+                                       }
+                                       break;
+                       case ',':
+                                       ret = '\n';
+                                       break;
+                                       
+               }
+               os.write(b);
+               prev = b;
+       }
+       public void resetIndent() {
+               indent = 1;
+       }
+
+       @Override
+       public void flush() throws IOException {
+               os.flush();
+       }
+
+       @Override
+       public void close() throws IOException {
+               if(closeable) {
+                       os.close();
+               }
+       }
+
+}