Add method "needsSequentialWriting" to VFS

Change-Id: I61a1994284503ab17adfb71102cb6f6c8f44dfa9

11 files changed, 52 insertions, 0 deletions

diff --git a/sched/src/com/android/sched/vfs/DeflateFS.java b/sched/src/com/android/sched/vfs/DeflateFS.java
index 71e69741..9fcda5ac 100644
--- a/sched/src/com/android/sched/vfs/DeflateFS.java
+++ b/sched/src/com/android/sched/vfs/DeflateFS.java
@@ -138,4 +138,9 @@ public class DeflateFS extends BaseVFS<BaseVDir, BaseVFile> implements VFS{
     dir.changeVFS(this);
     return dir;
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return vfs.needsSequentialWriting();
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/DirectFS.java b/sched/src/com/android/sched/vfs/DirectFS.java
index 1e8b761d..a55df61b 100644
--- a/sched/src/com/android/sched/vfs/DirectFS.java
+++ b/sched/src/com/android/sched/vfs/DirectFS.java
@@ -307,4 +307,9 @@ public class DirectFS extends BaseVFS<DirectVDir, DirectVFile> implements VFS {
 
     return new DirectNonRootVDir(this, parent, name);
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return false;
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/DirectVFS.java b/sched/src/com/android/sched/vfs/DirectVFS.java
index b1ca1fbc..a296d0e9 100644
--- a/sched/src/com/android/sched/vfs/DirectVFS.java
+++ b/sched/src/com/android/sched/vfs/DirectVFS.java
@@ -55,4 +55,9 @@ public class DirectVFS extends AbstractInputOutputVFS implements ParallelOutputV
   public String getPath() {
     return dir.getPath();
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return false;
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/GenericInputOutputVFS.java b/sched/src/com/android/sched/vfs/GenericInputOutputVFS.java
index ba4464ba..d0b37725 100644
--- a/sched/src/com/android/sched/vfs/GenericInputOutputVFS.java
+++ b/sched/src/com/android/sched/vfs/GenericInputOutputVFS.java
@@ -67,4 +67,9 @@ public class GenericInputOutputVFS extends AbstractVFS implements InputOutputVFS
   public OutputVDir getRootOutputVDir() {
     return new GenericOutputVDir(vfs.getRootDir());
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return vfs.needsSequentialWriting();
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/GenericOutputVFS.java b/sched/src/com/android/sched/vfs/GenericOutputVFS.java
index 26a8bda3..410964e0 100644
--- a/sched/src/com/android/sched/vfs/GenericOutputVFS.java
+++ b/sched/src/com/android/sched/vfs/GenericOutputVFS.java
@@ -55,5 +55,10 @@ public class GenericOutputVFS extends AbstractVFS implements OutputVFS {
   public void close() throws IOException {
     vfs.close();
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return vfs.needsSequentialWriting();
+  }
 }
 
diff --git a/sched/src/com/android/sched/vfs/InputOutputZipVFS.java b/sched/src/com/android/sched/vfs/InputOutputZipVFS.java
index 680712e4..e5aaa6c1 100644
--- a/sched/src/com/android/sched/vfs/InputOutputZipVFS.java
+++ b/sched/src/com/android/sched/vfs/InputOutputZipVFS.java
@@ -106,4 +106,9 @@ public class InputOutputZipVFS extends AbstractInputOutputVFS implements InputOu
   synchronized boolean isClosed() {
     return closed;
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return false;
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/MessageDigestOutputVFS.java b/sched/src/com/android/sched/vfs/MessageDigestOutputVFS.java
index 7d5aa3d2..7172e56d 100644
--- a/sched/src/com/android/sched/vfs/MessageDigestOutputVFS.java
+++ b/sched/src/com/android/sched/vfs/MessageDigestOutputVFS.java
@@ -232,4 +232,9 @@ public class MessageDigestOutputVFS extends MessageDigestVFS implements OutputVF
   private synchronized void addFile(@Nonnull MessageDigestOutputVFile file) {
     files.add(file);
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return vfs.needsSequentialWriting();
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/OutputVFS.java b/sched/src/com/android/sched/vfs/OutputVFS.java
index ffa972d1..d7018c0e 100644
--- a/sched/src/com/android/sched/vfs/OutputVFS.java
+++ b/sched/src/com/android/sched/vfs/OutputVFS.java
@@ -30,4 +30,6 @@ public interface OutputVFS extends HasLocation, Closeable {
   String getPath();
   @Nonnull
   OutputVDir getRootOutputVDir();
+
+  boolean needsSequentialWriting();
 }
diff --git a/sched/src/com/android/sched/vfs/OutputZipVFS.java b/sched/src/com/android/sched/vfs/OutputZipVFS.java
index 8ac0e45a..622732b0 100644
--- a/sched/src/com/android/sched/vfs/OutputZipVFS.java
+++ b/sched/src/com/android/sched/vfs/OutputZipVFS.java
@@ -75,4 +75,9 @@ public class OutputZipVFS extends AbstractOutputVFS implements SequentialOutputV
   public String getPath() {
     return file.getPath();
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return true;
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/PrefixedOutputVFS.java b/sched/src/com/android/sched/vfs/PrefixedOutputVFS.java
index 92621f36..262c24db 100644
--- a/sched/src/com/android/sched/vfs/PrefixedOutputVFS.java
+++ b/sched/src/com/android/sched/vfs/PrefixedOutputVFS.java
@@ -29,6 +29,8 @@ import javax.annotation.Nonnull;
  */
 public class PrefixedOutputVFS extends AbstractOutputVFS {
 
+  private final boolean needsSequentialWriting;
+
   public PrefixedOutputVFS(@Nonnull InputOutputVFS outputVFS, @Nonnull VPath path)
       throws NotDirectoryException, CannotCreateFileException {
     InputOutputVDir previousRootDir = outputVFS.getRootInputOutputVDir();
@@ -39,6 +41,7 @@ public class PrefixedOutputVFS extends AbstractOutputVFS {
       newRootDir = previousRootDir.createOutputVDir(path);
     }
     setRootDir(newRootDir);
+    needsSequentialWriting = outputVFS.needsSequentialWriting();
   }
 
   @Override
@@ -57,4 +60,9 @@ public class PrefixedOutputVFS extends AbstractOutputVFS {
   public void close() {
     // do not actually close
   }
+
+  @Override
+  public boolean needsSequentialWriting() {
+    return needsSequentialWriting;
+  }
 }
diff --git a/sched/src/com/android/sched/vfs/VFS.java b/sched/src/com/android/sched/vfs/VFS.java
index 27f2dc25..4772ec2f 100644
--- a/sched/src/com/android/sched/vfs/VFS.java
+++ b/sched/src/com/android/sched/vfs/VFS.java
@@ -31,4 +31,6 @@ public interface VFS extends HasLocation, Closeable {
 
   @Nonnull
   VDir getRootDir();
+
+  boolean needsSequentialWriting();
 }