Make SourceInfo a class, rename its menthods.

compiler/java/com/google/dart/compiler/common/AbstractNode.java

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 package com.google.dart.compiler.common;
 
-import com.google.common.base.Preconditions;
-import com.google.dart.compiler.Source;
-
 /**
  * Abstract base class for nodes that carry source information.
  */
-public class AbstractNode implements SourceInfo, HasSourceInfo {
+public class AbstractNode implements HasSourceInfo {
 
-  // TODO(johnlenz): All this source location data is wasteful.
-  // Move it into a common object, that can be shared between the ASTs
-  // or something.
-  protected Source source = null;
-  protected int sourceLine = -1;
-  protected int sourceColumn = -1;
-  protected int sourceStart = -1;
-  protected int sourceLength = -1;
-
-  @Override
-  public Source getSource() {
-    return source;
-  }
-
-  @Override
-  public int getSourceLine() {
-    return sourceLine;
-  }
-
-  @Override
-  public int getSourceColumn() {
-    return sourceColumn;
-  }
-
-  @Override
-  public int getSourceStart() {
-    return sourceStart;
-  }
-
-  @Override
-  public int getSourceLength() {
-    return sourceLength;
-  }
+  private SourceInfo sourceInfo = SourceInfo.UNKNOWN;
 
   @Override
   public SourceInfo getSourceInfo() {
-    return this;
+    return sourceInfo;
   }
 
   @Override
   public void setSourceInfo(SourceInfo info) {
-    source = info.getSource();
-    sourceStart = info.getSourceStart();
-    sourceLength = info.getSourceLength();
-    sourceLine = info.getSourceLine();
-    sourceColumn = info.getSourceColumn();
+    sourceInfo = info;
   }
-
-  @Override
-  public final void setSourceLocation(
-      Source source, int line, int column, int startPosition, int length) {
-    Preconditions.checkArgument(startPosition != -1 && length >= 0
-        || startPosition == -1 && length == 0);
-    this.source = source;
-    this.sourceLine = line;
-    this.sourceColumn = column;
-    this.sourceStart = startPosition;
-    this.sourceLength = length;
-  }
-
-  public final void setSourceRange(int startPosition, int length) {
-    Preconditions.checkArgument(startPosition != -1 && length >= 0
-                                || startPosition == -1 && length == 0);
-    this.sourceStart = startPosition;
-    this.sourceLength = length;
-  }
-
 }