http://micronaut.io: Natively Cloud Native
  • Graeme Rocher 
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.

/***
 * 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 io.micronaut.core.io.scan;

import io.micronaut.core.annotation.Internal;
import org.objectweb.asm.Label;


A non standard class, field, method or code attribute.

Author:Eric Bruneton, Eugene Kuleshov
/**
 * A non standard class, field, method or code attribute.
 *
 * @author Eric Bruneton
 * @author Eugene Kuleshov
 */
@Internal
class Attribute {

    
The type of this attribute.

/**
     * The type of this attribute.
     */
    final String type;

    
The raw value of this attribute, used only for unknown attributes.

/**
     * The raw value of this attribute, used only for unknown attributes.
     */
    byte[] value;

    
The next attribute in this attribute list. May be null.

/**
     * The next attribute in this attribute list. May be <tt>null</tt>.
     */
    Attribute next;

    
Constructs a new empty attribute.

Params:
  • type – the type of the attribute.
/**
     * Constructs a new empty attribute.
     *
     * @param type the type of the attribute.
     */
    protected Attribute(final String type) {
        this.type = type;
    }

    
Reads a type attribute. This method must return a new Attribute object, of type type, corresponding to the len bytes starting at the given offset, in
the given class reader.

Params:
  • cr –      the class that contains the attribute to be read.
  • off –  index of the first byte of the attribute's content in cr.b. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
  • len –     the length of the attribute's content.
  • buf –  buffer to be used to call 
               readUTF8, readClass or readConst.
  • codeOff – index of the first byte of code's attribute content in cr.b, or -1 if the attribute to be read is not a code attribute. The 6 attribute header bytes, containing the type and the length of the attribute, are not taken into account here.
  • labels –  the labels of the method's code, or null if the
               attribute to be read is not a code attribute.
Returns:a new Attribute object corresponding to the given bytes.
/**
     * Reads a {@link #type type} attribute. This method must return a
     * <i>new</i> {@link Attribute} object, of type {@link #type type},
     * corresponding to the <tt>len</tt> bytes starting at the given offset, in
     * the given class reader.
     *
     * @param cr      the class that contains the attribute to be read.
     * @param off     index of the first byte of the attribute's content in
     *                {@link org.objectweb.asm.ClassReader#b cr.b}. The 6 attribute header bytes,
     *                containing the type and the length of the attribute, are not
     *                taken into account here.
     * @param len     the length of the attribute's content.
     * @param buf     buffer to be used to call {@link org.objectweb.asm.ClassReader#readUTF8
     *                readUTF8}, {@link org.objectweb.asm.ClassReader#readClass(int, char[]) readClass}
     *                or {@link org.objectweb.asm.ClassReader#readConst readConst}.
     * @param codeOff index of the first byte of code's attribute content in
     *                {@link org.objectweb.asm.ClassReader#b cr.b}, or -1 if the attribute to be read
     *                is not a code attribute. The 6 attribute header bytes,
     *                containing the type and the length of the attribute, are not
     *                taken into account here.
     * @param labels  the labels of the method's code, or <tt>null</tt> if the
     *                attribute to be read is not a code attribute.
     * @return a <i>new</i> {@link Attribute} object corresponding to the given
     * bytes.
     */
    protected Attribute read(final AnnotationClassReader cr, final int off,
                             final int len, final char[] buf, final int codeOff,
                             final Label[] labels) {
        Attribute attr = new Attribute(type);
        attr.value = new byte[len];
        System.arraycopy(cr.b, off, attr.value, 0, len);
        return attr;
    }
}