1 files changed, 135 insertions, 0 deletions
diff --git a/asm-util/src/main/java/org/objectweb/asm/util/CheckAnnotationAdapter.java b/asm-util/src/main/java/org/objectweb/asm/util/CheckAnnotationAdapter.java
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+++ b/asm-util/src/main/java/org/objectweb/asm/util/CheckAnnotationAdapter.java
@@ -0,0 +1,135 @@
+// ASM: a very small and fast Java bytecode manipulation framework
+// Copyright (c) 2000-2011 INRIA, France Telecom
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+// 3. Neither the name of the copyright holders nor the names of its
+//    contributors may be used to endorse or promote products derived from
+//    this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+// THE POSSIBILITY OF SUCH DAMAGE.
+package org.objectweb.asm.util;
+
+import org.objectweb.asm.AnnotationVisitor;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+
+/**
+ * An {@link AnnotationVisitor} that checks that its methods are properly used.
+ *
+ * @author Eric Bruneton
+ */
+public class CheckAnnotationAdapter extends AnnotationVisitor {
+
+  /**
+   * Whether the values of the visited annotation are named. AnnotationVisitor instances used for
+   * annotation default and annotation arrays use unnamed values.
+   */
+  private final boolean useNamedValue;
+
+  /** Whether the {@link #visitEnd} method has been called. */
+  private boolean visitEndCalled;
+
+  public CheckAnnotationAdapter(final AnnotationVisitor annotationVisitor) {
+    this(annotationVisitor, true);
+  }
+
+  CheckAnnotationAdapter(final AnnotationVisitor annotationVisitor, final boolean useNamedValues) {
+    super(/* latest api = */ Opcodes.ASM9, annotationVisitor);
+    this.useNamedValue = useNamedValues;
+  }
+
+  @Override
+  public void visit(final String name, final Object value) {
+    checkVisitEndNotCalled();
+    checkName(name);
+    if (!(value instanceof Byte
+        || value instanceof Boolean
+        || value instanceof Character
+        || value instanceof Short
+        || value instanceof Integer
+        || value instanceof Long
+        || value instanceof Float
+        || value instanceof Double
+        || value instanceof String
+        || value instanceof Type
+        || value instanceof byte[]
+        || value instanceof boolean[]
+        || value instanceof char[]
+        || value instanceof short[]
+        || value instanceof int[]
+        || value instanceof long[]
+        || value instanceof float[]
+        || value instanceof double[])) {
+      throw new IllegalArgumentException("Invalid annotation value");
+    }
+    if (value instanceof Type && ((Type) value).getSort() == Type.METHOD) {
+      throw new IllegalArgumentException("Invalid annotation value");
+    }
+    super.visit(name, value);
+  }
+
+  @Override
+  public void visitEnum(final String name, final String descriptor, final String value) {
+    checkVisitEndNotCalled();
+    checkName(name);
+    // Annotations can only appear in V1_5 or more classes.
+    CheckMethodAdapter.checkDescriptor(Opcodes.V1_5, descriptor, false);
+    if (value == null) {
+      throw new IllegalArgumentException("Invalid enum value");
+    }
+    super.visitEnum(name, descriptor, value);
+  }
+
+  @Override
+  public AnnotationVisitor visitAnnotation(final String name, final String descriptor) {
+    checkVisitEndNotCalled();
+    checkName(name);
+    // Annotations can only appear in V1_5 or more classes.
+    CheckMethodAdapter.checkDescriptor(Opcodes.V1_5, descriptor, false);
+    return new CheckAnnotationAdapter(super.visitAnnotation(name, descriptor));
+  }
+
+  @Override
+  public AnnotationVisitor visitArray(final String name) {
+    checkVisitEndNotCalled();
+    checkName(name);
+    return new CheckAnnotationAdapter(super.visitArray(name), false);
+  }
+
+  @Override
+  public void visitEnd() {
+    checkVisitEndNotCalled();
+    visitEndCalled = true;
+    super.visitEnd();
+  }
+
+  private void checkName(final String name) {
+    if (useNamedValue && name == null) {
+      throw new IllegalArgumentException("Annotation value name must not be null");
+    }
+  }
+
+  private void checkVisitEndNotCalled() {
+    if (visitEndCalled) {
+      throw new IllegalStateException("Cannot call a visit method after visitEnd has been called");
+    }
+  }
+}