1 files changed, 41 insertions, 5 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileInfo.java b/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileInfo.java
index 32ec7a8506..33a9245c2b 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileInfo.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/actions/ParamFileInfo.java
@@ -14,6 +14,8 @@
 
 package com.google.devtools.build.lib.analysis.actions;
 
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+
 import com.google.devtools.build.lib.actions.ParameterFile.ParameterFileType;
 import com.google.devtools.build.lib.util.Preconditions;
 import com.google.errorprone.annotations.CompileTimeConstant;
@@ -32,11 +34,7 @@ public final class ParamFileInfo {
   private final String flag;
   private final boolean always;
 
-  public ParamFileInfo(
-      ParameterFileType fileType,
-      Charset charset,
-      @CompileTimeConstant String flag,
-      boolean always) {
+  private ParamFileInfo(ParameterFileType fileType, Charset charset, String flag, boolean always) {
     this.fileType = Preconditions.checkNotNull(fileType);
     this.charset = Preconditions.checkNotNull(charset);
     this.flag = Preconditions.checkNotNull(flag);
@@ -88,4 +86,42 @@ public final class ParamFileInfo {
         && flag.equals(other.flag)
         && always == other.always;
   }
+
+  public static Builder builder(ParameterFileType parameterFileType) {
+    return new Builder(parameterFileType);
+  }
+
+  /** Builder for a ParamFileInfo. */
+  public static class Builder {
+    private final ParameterFileType fileType;
+    private Charset charset = ISO_8859_1;
+    private String flag = "@";
+    private boolean always;
+
+    private Builder(ParameterFileType fileType) {
+      this.fileType = fileType;
+    }
+
+    /** Sets the encoding to write the parameter file with. */
+    public Builder setCharset(Charset charset) {
+      this.charset = charset;
+      return this;
+    }
+
+    /** Sets a prefix to use for the flag that is passed to original command. */
+    public Builder setFlag(@CompileTimeConstant String flag) {
+      this.flag = flag;
+      return this;
+    }
+
+    /** Set whether the parameter file is always used, regardless of parameter file length. */
+    public Builder setUseAlways(boolean always) {
+      this.always = always;
+      return this;
+    }
+
+    public ParamFileInfo build() {
+      return new ParamFileInfo(fileType, charset, flag, always);
+    }
+  }
 }