io.micronaut.ast.groovy.scan.Attribute Maven / Gradle / Ivy
/*
* Copyright 2017-2011 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.ast.groovy.scan;
import groovyjarjarasm.asm.Label;
import io.micronaut.core.annotation.Internal;
/**
* A non-standard class, field, method or code attribute.
*
* @author Eric Bruneton
* @author Eugene Kuleshov
*/
@Internal
class Attribute {
/**
* The type of this attribute.
*/
final String type;
/**
* The raw value of this attribute, used only for unknown attributes.
*/
byte[] value;
/**
* The next attribute in this attribute list. May be {@code null}.
*/
Attribute next;
/**
* Constructs a new empty attribute.
*
* @param type the type of the attribute.
*/
protected Attribute(final String type) {
this.type = type;
}
/**
* Reads a {@link #type type} attribute. This method must return a
* new {@link Attribute} object, of type {@link #type type},
* corresponding to the {@code len} 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 groovyjarjarasm.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 groovyjarjarasm.asm.ClassReader#readUTF8
* readUTF8}, {@link groovyjarjarasm.asm.ClassReader#readClass(int, char[]) readClass}
* or {@link groovyjarjarasm.asm.ClassReader#readConst readConst}.
* @param codeOff index of the first byte of code's attribute content in
* {@link groovyjarjarasm.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 {@code null} if the
* attribute to be read is not a code attribute.
* @return a new {@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;
}
}