Add toString() methods on label-related types

Change-Id: If4df99168fd72d470838fefd94f87cac316fad2a

gerrit-common/src/main/java/com/google/gerrit/common/data/LabelType.java

@@ -236,4 +236,27 @@ public class LabelType {
   public ApprovalCategory.Id getApprovalCategoryId() {
     return new ApprovalCategory.Id(getId());
   }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder(name).append('[');
+    LabelValue min = getMin();
+    LabelValue max = getMax();
+    if (id != null) {
+      sb.append(id);
+      if (min != null || max != null) {
+        sb.append(", ");
+      }
+    }
+    if (min != null && max != null) {
+      sb.append(new PermissionRange(Permission.forLabel(name), min.getValue(),
+          max.getValue()).toString().trim());
+    } else if (min != null) {
+      sb.append(min.formatValue().trim());
+    } else if (max != null) {
+      sb.append(max.formatValue().trim());
+    }
+    sb.append(']');
+    return sb.toString();
+  }
 }

gerrit-common/src/main/java/com/google/gerrit/common/data/LabelTypes.java

@@ -66,4 +66,9 @@ public class LabelTypes {
     }
     return byLabel;
   }
+
+  @Override
+  public String toString() {
+    return labelTypes.toString();
+  }
 }

gerrit-common/src/main/java/com/google/gerrit/common/data/LabelValue.java

@@ -59,4 +59,9 @@ public class LabelValue {
     return new StringBuilder().append(formatValue())
         .append(' ').append(text).toString();
   }
+
+  @Override
+  public String toString() {
+    return format();
+  }
 }

gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/PatchSetApproval.java

@@ -165,4 +165,10 @@ public final class PatchSetApproval {
   public void setLabel(String label) {
     this.label = label;
   }
+
+  @Override
+  public String toString() {
+    return new StringBuilder().append('[').append(key).append(": ")
+        .append(value).append(']').toString();
+  }
 }