tools/release-parser/src/com/android/cts/releaseparser/DepPrinter.java - platform/cts - Git at Google

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * 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 com.android.cts.releaseparser;

 import com.android.cts.releaseparser.ReleaseProto.*;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.TreeMap;

 public class DepPrinter {
     private ReleaseContent mRelContent;
     private PrintWriter mPWriter;
     private HashMap<String, Integer> mLibMap;
     private HashMap<String, Integer> mDepPathMap;
     private TreeMap<String, Entry> mTreeEntryMap;
     private ReleaseContent mBRelContent;
     private int mBits;
     private String mTitle;
     private int mCurLevel;

     private static String getTitle(ReleaseContent relContent) {
         return relContent.getName() + relContent.getVersion() + relContent.getBuildNumber();
     }

     public DepPrinter(ReleaseContent relContent) {
         mRelContent = relContent;
         mTitle = getTitle(relContent);
         mBRelContent = null;
         mTreeEntryMap = new TreeMap<String, Entry>(mRelContent.getEntries());
     }

     public void writeDeltaDigraphs(ReleaseContent bRelContent, String dirName) {
         mBRelContent = bRelContent;
         mTitle = mTitle + "_vs_" + getTitle(bRelContent);
         compareEntries(dirName);
     }

     public void compareEntries(String dirName) {
         for (Entry entry : mRelContent.getEntries().values()) {
             if (entry.getType() == Entry.EntryType.EXE) {
                 String exeName = entry.getName();
                 String fileName = String.format("%s/%s.gv", dirName, exeName);
                 writeDigraph(entry, fileName);
             }
         }
     }

     public void writeDeltaDigraph(String exeName, ReleaseContent bRelContent, String fileName) {
         mBRelContent = bRelContent;
         mTitle = mTitle + "_vs_" + getTitle(bRelContent);
         compareEntry(exeName, fileName);
     }

     public void compareEntry(String exeName, String fileName) {
         for (Entry entry : mRelContent.getEntries().values()) {
             if (entry.getName().equals(exeName)) {
                 writeDigraph(entry, fileName);
                 break;
             }
         }
     }

     public void writeDigraph(Entry entry, String fileName) {
         try {
             String exeName = entry.getName();
             FileWriter fWriter = new FileWriter(fileName);
             mPWriter = new PrintWriter(fWriter);
             mLibMap = new HashMap<String, Integer>();
             mDepPathMap = new HashMap<String, Integer>();
             mBits = entry.getAbiBits();
             // Header
             mPWriter.println("digraph {");
             mPWriter.println(
                     String.format(
                             "a [label=\"%s %dbits\" shape=plaintext]", getNodeName(mTitle), mBits));

             String sourceNode = getNodeName(exeName);
             mPWriter.printf(String.format("%s [label=\"%s\"", sourceNode, exeName));
             checkDelta(entry);
             mPWriter.println("]");

             mCurLevel = 0;
             printDep(entry, sourceNode);

             mPWriter.println("}");
             mPWriter.flush();
             mPWriter.close();
         } catch (IOException e) {
             System.err.println("IOException:" + e.getMessage());
         }
     }

     public void writeRcDeltaDigraphs(ReleaseContent bRelContent, String dirName) {
         mBRelContent = bRelContent;
         mTitle = mTitle + "_vs_" + getTitle(bRelContent);
         compareRcEntries(dirName);
     }

     public void compareRcEntries(String dirName) {
         String fileName = String.format("%s/%s.gv", dirName, "RC-files");
         try {
             FileWriter fWriter = new FileWriter(fileName);
             mPWriter = new PrintWriter(fWriter);
             String rootNode = "root";
             mPWriter.println("digraph {");
             mPWriter.println("rankdir=LR;");
             mPWriter.println("node [shape = box]");
             mPWriter.println(String.format("%s [label=\"%s\"]", rootNode, getNodeName(mTitle)));

             for (Entry entry : mRelContent.getEntries().values()) {
                 if (entry.getType() == Entry.EntryType.RC) {
                     // only care if a RC starts Services
                     if (entry.getDependenciesList().size() > 0) {
                         writeRcDigraph(entry, rootNode);
                     }
                 }
             }

             mPWriter.println("}");
             mPWriter.flush();
             mPWriter.close();
         } catch (IOException e) {
             System.err.println("IOException:" + e.getMessage());
         }
     }

     public void writeRcDigraph(Entry entry, String rootNode) {
         String rcName = entry.getRelativePath();
         String sourceNode = getNodeName(rcName);
         mPWriter.printf(String.format("%s [label=\"%s\"", sourceNode, rcName));
         checkDelta(entry);
         mPWriter.println("]");

         mPWriter.println(String.format("%s -> %s", rootNode, sourceNode));

         for (Service target : entry.getServicesList()) {
             String targetFile =
                     target.getFile().replace("/system/", "SYSTEM/").replace("/vendor/", "VENDOR/");
             String targetNode = getNodeName(targetFile);
             mPWriter.printf(String.format("%s [label=\"%s\"", targetNode, targetFile));
             Entry targetEntry = mRelContent.getEntries().get(targetFile);
             if (targetEntry != null) {
                 checkDelta(targetEntry);
             }
             mPWriter.println("]");

             String depPath = String.format("%s -> %s", sourceNode, targetNode);
             mPWriter.println(depPath);
         }
     }

     private void checkDelta(Entry srcEntry) {
         // compare
         if (mBRelContent != null) {
             // System.err.println(srcEntry.getRelativePath());
             Entry bEntry = mBRelContent.getEntries().get(srcEntry.getRelativePath());
             if (bEntry == null) {
                 // New Entry
                 mPWriter.printf(" fillcolor=\"gold1\" style=\"filled\"");
             } else {
                 if (srcEntry.getContentId().equals(bEntry.getContentId())) {
                     // Same
                     mPWriter.printf(" fillcolor=\"green\" style=\"filled\"");
                 } else {
                     // Different
                     mPWriter.printf(" fillcolor=\"red\" style=\"filled\"");
                 }
             }
         }
     }

     private String getNodeName(String note) {
         return note.replace(".", "_")
                 .replace("@", "")
                 .replace("+", "p")
                 .replace("-", "_")
                 .replace("/", "_");
     }

     private void printDep(Entry srcEntry, String sourceNode) {
         mCurLevel += 1;
         ArrayList<String> allDepList = new ArrayList<>();
         allDepList.addAll(srcEntry.getDependenciesList());
         int depCnt = allDepList.size();
         allDepList.addAll(srcEntry.getDynamicLoadingDependenciesList());
         int no = 0;

         for (String dep : allDepList) {
             boolean goFurther = false;
             String targetNode;
             Entry depEntry = null;
             String filePath = dep;

             // libEGL*.so to VENDOR/lib64/egl/libEGL_adreno.so
             int idx = dep.indexOf("*.so");
             if (idx > -1) {
                 if (mBits == 32) {
                     filePath = "VENDOR/lib/egl/" + dep.substring(0, idx);
                 } else {
                     filePath = "VENDOR/lib64/egl/" + dep.substring(0, idx);
                 }
                 depEntry = mTreeEntryMap.tailMap(filePath, false).firstEntry().getValue();
                 dep = depEntry.getName();
             }
             targetNode = getNodeName(dep);

             String depPath = String.format("%s -> %s", sourceNode, targetNode);
             if (no < depCnt) {
                 depPath = String.format("%s -> %s", sourceNode, targetNode);
             } else {
                 // This is Dyanmic Loading
                 depPath = String.format("%s -> %s [color=\"blue\"]", sourceNode, targetNode);
             }

             if (mDepPathMap.get(depPath) == null) {
                 // Print path once only
                 mDepPathMap.put(depPath, 1);
                 mPWriter.println(depPath);
             }

             if (depEntry == null) {
                 if (dep.startsWith("/system")) {
                     depEntry = mRelContent.getEntries().get(dep.replace("/system/", "SYSTEM/"));
                 } else if (dep.startsWith("/vendor")) {
                     depEntry = mRelContent.getEntries().get(dep.replace("/vendor/", "VENDOR/"));
                 } else {
                     if (mBits == 32) {
                         filePath = String.format("SYSTEM/lib/%s", dep);
                     } else {
                         filePath = String.format("SYSTEM/lib64/%s", dep);
                     }

                     depEntry = mRelContent.getEntries().get(filePath);

                     if (depEntry == null) {
                         // try Vendor
                         if (mBits == 32) {
                             filePath = String.format("VENDOR/lib/%s", dep);
                         } else {
                             filePath = String.format("VENDOR/lib64/%s", dep);
                         }
                         depEntry = mRelContent.getEntries().get(filePath);
                     }

                     if (depEntry == null) {
                         // try Vendor
                         if (mBits == 32) {
                             filePath = String.format("VENDOR/lib/%s", dep);
                         } else {
                             filePath = String.format("VENDOR/lib64/%s", dep);
                         }
                         depEntry = mRelContent.getEntries().get(filePath);
                     }
                 }
             }

             if (depEntry == null && dep.endsWith("libGLES_android.so")) {
                 // try Vendor
                 if (mBits == 32) {
                     filePath = "SYSTEM/lib/egl/libGLES_android.so";
                 } else {
                     filePath = "SYSTEM/lib64/egl/libGLES_android.so";
                 }
                 depEntry = mRelContent.getEntries().get(filePath);
             }

             if (depEntry != null) {
                 if (mLibMap.get(targetNode) == null) {
                     // Print Entry node once only
                     mLibMap.put(targetNode, 1);
                     mPWriter.printf(String.format("%s [label=\"%s\"", targetNode, dep));
                     checkDelta(depEntry);

                     // Try to patch symbolic link to the target file
                     if (depEntry.getType() == Entry.EntryType.SYMBOLIC_LINK) {
                         mPWriter.printf(", shape=diamond");
                         filePath = depEntry.getParentFolder() + "/egl/" + depEntry.getName();
                         Entry sDepEntry = mRelContent.getEntries().get(filePath);
                         if (sDepEntry == null) {
                             System.err.println(
                                     "cannot find a target file for symbolic link: "
                                             + depEntry.getRelativePath());
                         } else {
                             depEntry = sDepEntry;
                         }
                     }
                     mPWriter.println("]");
                     // Only visit once
                     goFurther = true;
                 } else {
                     // Record max Level for a target
                     int i = mLibMap.get(targetNode);
                     mLibMap.put(targetNode, Math.max(i, mCurLevel));
                 }

                 if (goFurther) {
                     printDep(depEntry, targetNode);
                 }
             } else {
                 System.err.println("cannot find: " + filePath);
             }
             no++;
         }
         mCurLevel -= 1;
     }

     private static final String USAGE_MESSAGE =
             "Usage: java -cp releaseparser.jar com.android.cts.releaseparser.DepPrinter [-options]\n"
                     + "           to compare A B builds dependency for X \n"
                     + "Options:\n"
                     + "\t-a A-Release.pb\t A release Content Protobuf file \n"
                     + "\t-b B-Release.pb\t B release Content Protobuf file \n"
                     + "\t-e Exe Name\t generates the Delta Dependency Digraph for the Execuable \n"
                     + "\t-r \t generates RC file Delta Dependency Digraphs \n"
                     + "\t \t without -e & -t, it will generate all Delta Dependency Digraphs \n";

     /** Get the argument or print out the usage and exit. */
     private static void printUsage() {
         System.out.printf(USAGE_MESSAGE);
         System.exit(1);
     }

     /** Get the argument or print out the usage and exit. */
     private static String getExpectedArg(String[] args, int index) {
         if (index < args.length) {
             return args[index];
         } else {
             printUsage();
             return null; // Never will happen because printUsage will call exit(1)
         }
     }

     public static void main(final String[] args) {
         String aPB = null;
         String bPB = null;
         String exeName = null;
         boolean processRcOnly = false;

         for (int i = 0; i < args.length; i++) {
             if (args[i].startsWith("-")) {
                 if ("-a".equals(args[i])) {
                     aPB = getExpectedArg(args, ++i);
                 } else if ("-b".equals(args[i])) {
                     bPB = getExpectedArg(args, ++i);
                 } else if ("-e".equals(args[i])) {
                     exeName = getExpectedArg(args, ++i);
                 } else if ("-r".equals(args[i])) {
                     processRcOnly = true;
                 } else {
                     printUsage();
                 }
             }
         }
         if (aPB == null || bPB == null) {
             printUsage();
         }

         try {
             ReleaseContent aRelContent = ReleaseContent.parseFrom(new FileInputStream(aPB));
             DepPrinter depPrinter = new DepPrinter(aRelContent);
             ReleaseContent bRelContent = ReleaseContent.parseFrom(new FileInputStream(bPB));
             String dirName =
                     String.format("%s-vs-%s", getTitle(aRelContent), getTitle(bRelContent));
             File dir = new File(dirName);
             dir.mkdir();
             if (processRcOnly) {
                 // General RC delta digraphs
                 depPrinter.writeRcDeltaDigraphs(bRelContent, dirName);
             } else if (exeName == null) {
                 // General all execuable delta digraphs
                 depPrinter.writeDeltaDigraphs(bRelContent, dirName);
             } else {
                 depPrinter.writeDeltaDigraph(exeName, bRelContent, String.format("%s/%s.gv", dirName, exeName));
             }

         } catch (Exception e) {
             e.printStackTrace();
             System.err.println(e);
         }
     }
 }
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* 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 com.android.cts.releaseparser;

	import com.android.cts.releaseparser.ReleaseProto.*;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileWriter;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.TreeMap;

	public class DepPrinter {
	private ReleaseContent mRelContent;
	private PrintWriter mPWriter;
	private HashMap<String, Integer> mLibMap;
	private HashMap<String, Integer> mDepPathMap;
	private TreeMap<String, Entry> mTreeEntryMap;
	private ReleaseContent mBRelContent;
	private int mBits;
	private String mTitle;
	private int mCurLevel;

	private static String getTitle(ReleaseContent relContent) {
	return relContent.getName() + relContent.getVersion() + relContent.getBuildNumber();
	}

	public DepPrinter(ReleaseContent relContent) {
	mRelContent = relContent;
	mTitle = getTitle(relContent);
	mBRelContent = null;
	mTreeEntryMap = new TreeMap<String, Entry>(mRelContent.getEntries());
	}

	public void writeDeltaDigraphs(ReleaseContent bRelContent, String dirName) {
	mBRelContent = bRelContent;
	mTitle = mTitle + "_vs_" + getTitle(bRelContent);
	compareEntries(dirName);
	}

	public void compareEntries(String dirName) {
	for (Entry entry : mRelContent.getEntries().values()) {
	if (entry.getType() == Entry.EntryType.EXE) {
	String exeName = entry.getName();
	String fileName = String.format("%s/%s.gv", dirName, exeName);
	writeDigraph(entry, fileName);
	}
	}
	}

	public void writeDeltaDigraph(String exeName, ReleaseContent bRelContent, String fileName) {
	mBRelContent = bRelContent;
	mTitle = mTitle + "_vs_" + getTitle(bRelContent);
	compareEntry(exeName, fileName);
	}

	public void compareEntry(String exeName, String fileName) {
	for (Entry entry : mRelContent.getEntries().values()) {
	if (entry.getName().equals(exeName)) {
	writeDigraph(entry, fileName);
	break;
	}
	}
	}

	public void writeDigraph(Entry entry, String fileName) {
	try {
	String exeName = entry.getName();
	FileWriter fWriter = new FileWriter(fileName);
	mPWriter = new PrintWriter(fWriter);
	mLibMap = new HashMap<String, Integer>();
	mDepPathMap = new HashMap<String, Integer>();
	mBits = entry.getAbiBits();
	// Header
	mPWriter.println("digraph {");
	mPWriter.println(
	String.format(
	"a [label=\"%s %dbits\" shape=plaintext]", getNodeName(mTitle), mBits));

	String sourceNode = getNodeName(exeName);
	mPWriter.printf(String.format("%s [label=\"%s\"", sourceNode, exeName));
	checkDelta(entry);
	mPWriter.println("]");

	mCurLevel = 0;
	printDep(entry, sourceNode);

	mPWriter.println("}");
	mPWriter.flush();
	mPWriter.close();
	} catch (IOException e) {
	System.err.println("IOException:" + e.getMessage());
	}
	}

	public void writeRcDeltaDigraphs(ReleaseContent bRelContent, String dirName) {
	mBRelContent = bRelContent;
	mTitle = mTitle + "_vs_" + getTitle(bRelContent);
	compareRcEntries(dirName);
	}

	public void compareRcEntries(String dirName) {
	String fileName = String.format("%s/%s.gv", dirName, "RC-files");
	try {
	FileWriter fWriter = new FileWriter(fileName);
	mPWriter = new PrintWriter(fWriter);
	String rootNode = "root";
	mPWriter.println("digraph {");
	mPWriter.println("rankdir=LR;");
	mPWriter.println("node [shape = box]");
	mPWriter.println(String.format("%s [label=\"%s\"]", rootNode, getNodeName(mTitle)));

	for (Entry entry : mRelContent.getEntries().values()) {
	if (entry.getType() == Entry.EntryType.RC) {
	// only care if a RC starts Services
	if (entry.getDependenciesList().size() > 0) {
	writeRcDigraph(entry, rootNode);
	}
	}
	}

	mPWriter.println("}");
	mPWriter.flush();
	mPWriter.close();
	} catch (IOException e) {
	System.err.println("IOException:" + e.getMessage());
	}
	}

	public void writeRcDigraph(Entry entry, String rootNode) {
	String rcName = entry.getRelativePath();
	String sourceNode = getNodeName(rcName);
	mPWriter.printf(String.format("%s [label=\"%s\"", sourceNode, rcName));
	checkDelta(entry);
	mPWriter.println("]");

	mPWriter.println(String.format("%s -> %s", rootNode, sourceNode));

	for (Service target : entry.getServicesList()) {
	String targetFile =
	target.getFile().replace("/system/", "SYSTEM/").replace("/vendor/", "VENDOR/");
	String targetNode = getNodeName(targetFile);
	mPWriter.printf(String.format("%s [label=\"%s\"", targetNode, targetFile));
	Entry targetEntry = mRelContent.getEntries().get(targetFile);
	if (targetEntry != null) {
	checkDelta(targetEntry);
	}
	mPWriter.println("]");

	String depPath = String.format("%s -> %s", sourceNode, targetNode);
	mPWriter.println(depPath);
	}
	}

	private void checkDelta(Entry srcEntry) {
	// compare
	if (mBRelContent != null) {
	// System.err.println(srcEntry.getRelativePath());
	Entry bEntry = mBRelContent.getEntries().get(srcEntry.getRelativePath());
	if (bEntry == null) {
	// New Entry
	mPWriter.printf(" fillcolor=\"gold1\" style=\"filled\"");
	} else {
	if (srcEntry.getContentId().equals(bEntry.getContentId())) {
	// Same
	mPWriter.printf(" fillcolor=\"green\" style=\"filled\"");
	} else {
	// Different
	mPWriter.printf(" fillcolor=\"red\" style=\"filled\"");
	}
	}
	}
	}

	private String getNodeName(String note) {
	return note.replace(".", "_")
	.replace("@", "")
	.replace("+", "p")
	.replace("-", "_")
	.replace("/", "_");
	}

	private void printDep(Entry srcEntry, String sourceNode) {
	mCurLevel += 1;
	ArrayList<String> allDepList = new ArrayList<>();
	allDepList.addAll(srcEntry.getDependenciesList());
	int depCnt = allDepList.size();
	allDepList.addAll(srcEntry.getDynamicLoadingDependenciesList());
	int no = 0;

	for (String dep : allDepList) {
	boolean goFurther = false;
	String targetNode;
	Entry depEntry = null;
	String filePath = dep;

	// libEGL*.so to VENDOR/lib64/egl/libEGL_adreno.so
	int idx = dep.indexOf("*.so");
	if (idx > -1) {
	if (mBits == 32) {
	filePath = "VENDOR/lib/egl/" + dep.substring(0, idx);
	} else {
	filePath = "VENDOR/lib64/egl/" + dep.substring(0, idx);
	}
	depEntry = mTreeEntryMap.tailMap(filePath, false).firstEntry().getValue();
	dep = depEntry.getName();
	}
	targetNode = getNodeName(dep);

	String depPath = String.format("%s -> %s", sourceNode, targetNode);
	if (no < depCnt) {
	depPath = String.format("%s -> %s", sourceNode, targetNode);
	} else {
	// This is Dyanmic Loading
	depPath = String.format("%s -> %s [color=\"blue\"]", sourceNode, targetNode);
	}

	if (mDepPathMap.get(depPath) == null) {
	// Print path once only
	mDepPathMap.put(depPath, 1);
	mPWriter.println(depPath);
	}

	if (depEntry == null) {
	if (dep.startsWith("/system")) {
	depEntry = mRelContent.getEntries().get(dep.replace("/system/", "SYSTEM/"));
	} else if (dep.startsWith("/vendor")) {
	depEntry = mRelContent.getEntries().get(dep.replace("/vendor/", "VENDOR/"));
	} else {
	if (mBits == 32) {
	filePath = String.format("SYSTEM/lib/%s", dep);
	} else {
	filePath = String.format("SYSTEM/lib64/%s", dep);
	}

	depEntry = mRelContent.getEntries().get(filePath);

	if (depEntry == null) {
	// try Vendor
	if (mBits == 32) {
	filePath = String.format("VENDOR/lib/%s", dep);
	} else {
	filePath = String.format("VENDOR/lib64/%s", dep);
	}
	depEntry = mRelContent.getEntries().get(filePath);
	}

	if (depEntry == null) {
	// try Vendor
	if (mBits == 32) {
	filePath = String.format("VENDOR/lib/%s", dep);
	} else {
	filePath = String.format("VENDOR/lib64/%s", dep);
	}
	depEntry = mRelContent.getEntries().get(filePath);
	}
	}
	}

	if (depEntry == null && dep.endsWith("libGLES_android.so")) {
	// try Vendor
	if (mBits == 32) {
	filePath = "SYSTEM/lib/egl/libGLES_android.so";
	} else {
	filePath = "SYSTEM/lib64/egl/libGLES_android.so";
	}
	depEntry = mRelContent.getEntries().get(filePath);
	}

	if (depEntry != null) {
	if (mLibMap.get(targetNode) == null) {
	// Print Entry node once only
	mLibMap.put(targetNode, 1);
	mPWriter.printf(String.format("%s [label=\"%s\"", targetNode, dep));
	checkDelta(depEntry);

	// Try to patch symbolic link to the target file
	if (depEntry.getType() == Entry.EntryType.SYMBOLIC_LINK) {
	mPWriter.printf(", shape=diamond");
	filePath = depEntry.getParentFolder() + "/egl/" + depEntry.getName();
	Entry sDepEntry = mRelContent.getEntries().get(filePath);
	if (sDepEntry == null) {
	System.err.println(
	"cannot find a target file for symbolic link: "
	+ depEntry.getRelativePath());
	} else {
	depEntry = sDepEntry;
	}
	}
	mPWriter.println("]");
	// Only visit once
	goFurther = true;
	} else {
	// Record max Level for a target
	int i = mLibMap.get(targetNode);
	mLibMap.put(targetNode, Math.max(i, mCurLevel));
	}

	if (goFurther) {
	printDep(depEntry, targetNode);
	}
	} else {
	System.err.println("cannot find: " + filePath);
	}
	no++;
	}
	mCurLevel -= 1;
	}

	private static final String USAGE_MESSAGE =
	"Usage: java -cp releaseparser.jar com.android.cts.releaseparser.DepPrinter [-options]\n"
	+ " to compare A B builds dependency for X \n"
	+ "Options:\n"
	+ "\t-a A-Release.pb\t A release Content Protobuf file \n"
	+ "\t-b B-Release.pb\t B release Content Protobuf file \n"
	+ "\t-e Exe Name\t generates the Delta Dependency Digraph for the Execuable \n"
	+ "\t-r \t generates RC file Delta Dependency Digraphs \n"
	+ "\t \t without -e & -t, it will generate all Delta Dependency Digraphs \n";

	/** Get the argument or print out the usage and exit. */
	private static void printUsage() {
	System.out.printf(USAGE_MESSAGE);
	System.exit(1);
	}

	/** Get the argument or print out the usage and exit. */
	private static String getExpectedArg(String[] args, int index) {
	if (index < args.length) {
	return args[index];
	} else {
	printUsage();
	return null; // Never will happen because printUsage will call exit(1)
	}
	}

	public static void main(final String[] args) {
	String aPB = null;
	String bPB = null;
	String exeName = null;
	boolean processRcOnly = false;

	for (int i = 0; i < args.length; i++) {
	if (args[i].startsWith("-")) {
	if ("-a".equals(args[i])) {
	aPB = getExpectedArg(args, ++i);
	} else if ("-b".equals(args[i])) {
	bPB = getExpectedArg(args, ++i);
	} else if ("-e".equals(args[i])) {
	exeName = getExpectedArg(args, ++i);
	} else if ("-r".equals(args[i])) {
	processRcOnly = true;
	} else {
	printUsage();
	}
	}
	}
	if (aPB == null \|\| bPB == null) {
	printUsage();
	}

	try {
	ReleaseContent aRelContent = ReleaseContent.parseFrom(new FileInputStream(aPB));
	DepPrinter depPrinter = new DepPrinter(aRelContent);
	ReleaseContent bRelContent = ReleaseContent.parseFrom(new FileInputStream(bPB));
	String dirName =
	String.format("%s-vs-%s", getTitle(aRelContent), getTitle(bRelContent));
	File dir = new File(dirName);
	dir.mkdir();
	if (processRcOnly) {
	// General RC delta digraphs
	depPrinter.writeRcDeltaDigraphs(bRelContent, dirName);
	} else if (exeName == null) {
	// General all execuable delta digraphs
	depPrinter.writeDeltaDigraphs(bRelContent, dirName);
	} else {
	depPrinter.writeDeltaDigraph(exeName, bRelContent, String.format("%s/%s.gv", dirName, exeName));
	}

	} catch (Exception e) {
	e.printStackTrace();
	System.err.println(e);
	}
	}
	}