SLF4J adapter (in 'common') + call graph demo

Issue-ID: LOG-115
Change-Id: I0ba28c64b1aaeb571094409704f4f00313afdf36
Signed-off-by: Luke Parker <lparker@amdocs.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/reference/slf4j-reference/src/test/java/org/onap/logging/ref/slf4j/analysis/CallGraphReportWriter.java b/reference/slf4j-reference/src/test/java/org/onap/logging/ref/slf4j/analysis/CallGraphReportWriter.java
new file mode 100644
index 0000000..ee67b35
--- /dev/null
+++ b/reference/slf4j-reference/src/test/java/org/onap/logging/ref/slf4j/analysis/CallGraphReportWriter.java
@@ -0,0 +1,111 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.logging
+ * ================================================================================
+ * Copyright © 2018 Amdocs
+ * 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.logging.ref.slf4j.analysis;
+
+import java.util.List;
+
+import org.apache.commons.lang3.StringUtils;
+import org.testng.Assert;
+
+/**
+ * A simple, recursive text-only report writer for the call graph.
+ */
+public class CallGraphReportWriter {
+
+    /** The analyzer which does the work. */
+    final CallGraphAnalyzer mAnalyzer;
+
+    /** Short report, for validation. */
+    final StringBuilder mShortReport = new StringBuilder();
+
+    /** Longer report, for human eyes. */
+    final StringBuilder mLongReport = new StringBuilder();
+
+    /**
+     * Construct writer.
+     * @param analyzer initialized analyzer.
+     */
+    public CallGraphReportWriter(final CallGraphAnalyzer analyzer) {
+
+        this.mAnalyzer = analyzer;
+
+        Assert.assertTrue(analyzer.getEntries().size() > 0);
+        final LogEntry e0 = analyzer.findEntryPoint();
+        Assert.assertNotNull(e0);
+
+        this.mLongReport.append(e0.toShortString()).append("\n");
+        this.mShortReport.append(StringUtils.substringAfter(e0.getLogger(), ".Component")).append("\n");
+
+        this.report(e0, 1);
+
+    }
+
+    /**
+     * Recursively analyze.
+     * @param invoker entry point.
+     * @param depth recursive depth, for handbrake.
+     */
+    private void report(final LogEntry invoker, final int depth) {
+
+        if (depth > 100) {
+            throw new AssertionError("Recursion ad infinitum");
+        }
+
+        final List<LogEntry> invokes0 = this.mAnalyzer.findInvokes(invoker);
+        for (final LogEntry invoke0 : invokes0) {
+
+            final LogEntry invoked0 = this.mAnalyzer.findInvocation(invoke0);
+
+            Assert.assertNotNull(invoked0);
+
+            final String indent = StringUtils.repeat(' ', depth * 4);
+            this.mLongReport.append(indent).append(invoked0.toShortString()).append('\n');
+            this.mShortReport.append(indent).append(StringUtils.substringAfter(invoked0.getLogger(), ".Component")).append('\n');
+
+            report(invoked0, depth + 1);
+        }
+    }
+
+    /**
+     * Get report.
+     * @return short report, for validation.
+     */
+    public String getShortReport() {
+        return this.mShortReport.toString();
+    }
+
+    /**
+     * Get report.
+     * @return long report, for printing out.
+     */
+    public String getLongReport() {
+        return this.mLongReport.toString();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String toString() {
+        return this.getLongReport();
+    }
+}