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/***
* 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 scala.tools.asm.util;
import scala.tools.asm.AnnotationVisitor;
import scala.tools.asm.Attribute;
import scala.tools.asm.FieldVisitor;
import scala.tools.asm.Opcodes;
/**
* A {@link FieldVisitor} that checks that its methods are properly used.
*/
public class CheckFieldAdapter extends FieldVisitor {
private boolean end;
/**
* Constructs a new {@link CheckFieldAdapter}. <i>Subclasses must not use
* this constructor</i>. Instead, they must use the
* {@link #CheckFieldAdapter(int, FieldVisitor)} version.
*
* @param fv the field visitor to which this adapter must delegate calls.
*/
public CheckFieldAdapter(final FieldVisitor fv) {
this(Opcodes.ASM4, fv);
}
/**
* Constructs a new {@link CheckFieldAdapter}.
*
* @param api the ASM API version implemented by this visitor. Must be one
* of {@link Opcodes#ASM4}.
* @param fv the field visitor to which this adapter must delegate calls.
*/
protected CheckFieldAdapter(final int api, final FieldVisitor fv) {
super(api, fv);
}
@Override
public AnnotationVisitor visitAnnotation(
final String desc,
final boolean visible)
{
checkEnd();
CheckMethodAdapter.checkDesc(desc, false);
return new CheckAnnotationAdapter(super.visitAnnotation(desc, visible));
}
@Override
public void visitAttribute(final Attribute attr) {
checkEnd();
if (attr == null) {
throw new IllegalArgumentException("Invalid attribute (must not be null)");
}
super.visitAttribute(attr);
}
@Override
public void visitEnd() {
checkEnd();
end = true;
super.visitEnd();
}
private void checkEnd() {
if (end) {
throw new IllegalStateException("Cannot call a visit method after visitEnd has been called");
}
}
}
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