| // 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.apache.tapestry5.internal.plastic.asm.util; |
| |
| import org.apache.tapestry5.internal.plastic.asm.AnnotationVisitor; |
| import org.apache.tapestry5.internal.plastic.asm.Attribute; |
| import org.apache.tapestry5.internal.plastic.asm.FieldVisitor; |
| import org.apache.tapestry5.internal.plastic.asm.Opcodes; |
| import org.apache.tapestry5.internal.plastic.asm.TypePath; |
| import org.apache.tapestry5.internal.plastic.asm.TypeReference; |
| |
| /** |
| * A {@link FieldVisitor} that checks that its methods are properly used. |
| * |
| * @author Eric Bruneton |
| */ |
| public class CheckFieldAdapter extends FieldVisitor { |
| |
| /** Whether the {@link #visitEnd} method has been called. */ |
| private boolean visitEndCalled; |
| |
| /** |
| * Constructs a new {@link CheckFieldAdapter}. <i>Subclasses must not use this constructor</i>. |
| * Instead, they must use the {@link #CheckFieldAdapter(int, FieldVisitor)} version. |
| * |
| * @param fieldVisitor the field visitor to which this adapter must delegate calls. |
| * @throws IllegalStateException If a subclass calls this constructor. |
| */ |
| public CheckFieldAdapter(final FieldVisitor fieldVisitor) { |
| this(Opcodes.ASM7, fieldVisitor); |
| if (getClass() != CheckFieldAdapter.class) { |
| throw new IllegalStateException(); |
| } |
| } |
| |
| /** |
| * Constructs a new {@link CheckFieldAdapter}. |
| * |
| * @param api the ASM API version implemented by this visitor. Must be one of {@link |
| * Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}. |
| * @param fieldVisitor the field visitor to which this adapter must delegate calls. |
| */ |
| protected CheckFieldAdapter(final int api, final FieldVisitor fieldVisitor) { |
| super(api, fieldVisitor); |
| } |
| |
| @Override |
| public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) { |
| checkVisitEndNotCalled(); |
| // Annotations can only appear in V1_5 or more classes. |
| CheckMethodAdapter.checkDescriptor(Opcodes.V1_5, descriptor, false); |
| return new CheckAnnotationAdapter(super.visitAnnotation(descriptor, visible)); |
| } |
| |
| @Override |
| public AnnotationVisitor visitTypeAnnotation( |
| final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) { |
| checkVisitEndNotCalled(); |
| int sort = new TypeReference(typeRef).getSort(); |
| if (sort != TypeReference.FIELD) { |
| throw new IllegalArgumentException( |
| "Invalid type reference sort 0x" + Integer.toHexString(sort)); |
| } |
| CheckClassAdapter.checkTypeRef(typeRef); |
| CheckMethodAdapter.checkDescriptor(Opcodes.V1_5, descriptor, false); |
| return new CheckAnnotationAdapter( |
| super.visitTypeAnnotation(typeRef, typePath, descriptor, visible)); |
| } |
| |
| @Override |
| public void visitAttribute(final Attribute attribute) { |
| checkVisitEndNotCalled(); |
| if (attribute == null) { |
| throw new IllegalArgumentException("Invalid attribute (must not be null)"); |
| } |
| super.visitAttribute(attribute); |
| } |
| |
| @Override |
| public void visitEnd() { |
| checkVisitEndNotCalled(); |
| visitEndCalled = true; |
| super.visitEnd(); |
| } |
| |
| private void checkVisitEndNotCalled() { |
| if (visitEndCalled) { |
| throw new IllegalStateException("Cannot call a visit method after visitEnd has been called"); |
| } |
| } |
| } |