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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later,
- * or the Apache License Version 2.0.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist.bytecode;
-
- import java.io.DataInputStream;
- import java.io.DataOutputStream;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.List;
- import java.util.Map;
-
- // Note: if you define a new subclass of AttributeInfo, then
- // update AttributeInfo.read(), .copy(), and (maybe) write().
-
- /**
- * <code>attribute_info</code> structure.
- *
- * @see ClassFile#getAttribute(String)
- * @see MethodInfo#getAttribute(String)
- * @see FieldInfo#getAttribute(String)
- */
- public class AttributeInfo {
- protected ConstPool constPool;
- int name;
- byte[] info;
-
- protected AttributeInfo(ConstPool cp, int attrname, byte[] attrinfo) {
- constPool = cp;
- name = attrname;
- info = attrinfo;
- }
-
- protected AttributeInfo(ConstPool cp, String attrname) {
- this(cp, attrname, (byte[])null);
- }
-
- /**
- * Constructs an <code>attribute_info</code> structure.
- *
- * @param cp constant pool table
- * @param attrname attribute name
- * @param attrinfo <code>info</code> field
- * of <code>attribute_info</code> structure.
- */
- public AttributeInfo(ConstPool cp, String attrname, byte[] attrinfo) {
- this(cp, cp.addUtf8Info(attrname), attrinfo);
- }
-
- protected AttributeInfo(ConstPool cp, int n, DataInputStream in)
- throws IOException
- {
- constPool = cp;
- name = n;
- int len = in.readInt();
- info = new byte[len];
- if (len > 0)
- in.readFully(info);
- }
-
- static AttributeInfo read(ConstPool cp, DataInputStream in)
- throws IOException
- {
- int name = in.readUnsignedShort();
- String nameStr = cp.getUtf8Info(name);
- char first = nameStr.charAt(0);
- if (first < 'E')
- if (nameStr.equals(AnnotationDefaultAttribute.tag))
- return new AnnotationDefaultAttribute(cp, name, in);
- else if (nameStr.equals(BootstrapMethodsAttribute.tag))
- return new BootstrapMethodsAttribute(cp, name, in);
- else if (nameStr.equals(CodeAttribute.tag))
- return new CodeAttribute(cp, name, in);
- else if (nameStr.equals(ConstantAttribute.tag))
- return new ConstantAttribute(cp, name, in);
- else if (nameStr.equals(DeprecatedAttribute.tag))
- return new DeprecatedAttribute(cp, name, in);
-
- if (first < 'M')
- if (nameStr.equals(EnclosingMethodAttribute.tag))
- return new EnclosingMethodAttribute(cp, name, in);
- else if (nameStr.equals(ExceptionsAttribute.tag))
- return new ExceptionsAttribute(cp, name, in);
- else if (nameStr.equals(InnerClassesAttribute.tag))
- return new InnerClassesAttribute(cp, name, in);
- else if (nameStr.equals(LineNumberAttribute.tag))
- return new LineNumberAttribute(cp, name, in);
- else if (nameStr.equals(LocalVariableAttribute.tag))
- return new LocalVariableAttribute(cp, name, in);
- else if (nameStr.equals(LocalVariableTypeAttribute.tag))
- return new LocalVariableTypeAttribute(cp, name, in);
-
- if (first < 'S')
- /* Note that the names of Annotations attributes begin with 'R'. */
- if (nameStr.equals(MethodParametersAttribute.tag))
- return new MethodParametersAttribute(cp, name, in);
- else if (nameStr.equals(NestHostAttribute.tag))
- return new NestHostAttribute(cp, name, in);
- else if (nameStr.equals(NestMembersAttribute.tag))
- return new NestMembersAttribute(cp, name, in);
- else if (nameStr.equals(AnnotationsAttribute.visibleTag)
- || nameStr.equals(AnnotationsAttribute.invisibleTag))
- // RuntimeVisibleAnnotations or RuntimeInvisibleAnnotations
- return new AnnotationsAttribute(cp, name, in);
- else if (nameStr.equals(ParameterAnnotationsAttribute.visibleTag)
- || nameStr.equals(ParameterAnnotationsAttribute.invisibleTag))
- return new ParameterAnnotationsAttribute(cp, name, in);
- else if (nameStr.equals(TypeAnnotationsAttribute.visibleTag)
- || nameStr.equals(TypeAnnotationsAttribute.invisibleTag))
- return new TypeAnnotationsAttribute(cp, name, in);
-
- if (first >= 'S')
- if (nameStr.equals(SignatureAttribute.tag))
- return new SignatureAttribute(cp, name, in);
- else if (nameStr.equals(SourceFileAttribute.tag))
- return new SourceFileAttribute(cp, name, in);
- else if (nameStr.equals(SyntheticAttribute.tag))
- return new SyntheticAttribute(cp, name, in);
- else if (nameStr.equals(StackMap.tag))
- return new StackMap(cp, name, in);
- else if (nameStr.equals(StackMapTable.tag))
- return new StackMapTable(cp, name, in);
-
- return new AttributeInfo(cp, name, in);
- }
-
- /**
- * Returns an attribute name.
- */
- public String getName() {
- return constPool.getUtf8Info(name);
- }
-
- /**
- * Returns a constant pool table.
- */
- public ConstPool getConstPool() { return constPool; }
-
- /**
- * Returns the length of this <code>attribute_info</code>
- * structure.
- * The returned value is <code>attribute_length + 6</code>.
- */
- public int length() {
- return info.length + 6;
- }
-
- /**
- * Returns the <code>info</code> field
- * of this <code>attribute_info</code> structure.
- *
- * <p>This method is not available if the object is an instance
- * of <code>CodeAttribute</code>.
- */
- public byte[] get() { return info; }
-
- /**
- * Sets the <code>info</code> field
- * of this <code>attribute_info</code> structure.
- *
- * <p>This method is not available if the object is an instance
- * of <code>CodeAttribute</code>.
- */
- public void set(byte[] newinfo) { info = newinfo; }
-
- /**
- * Makes a copy. Class names are replaced according to the
- * given <code>Map</code> object.
- *
- * @param newCp the constant pool table used by the new copy.
- * @param classnames pairs of replaced and substituted
- * class names.
- */
- public AttributeInfo copy(ConstPool newCp, Map<String,String> classnames)
- {
- return new AttributeInfo(newCp, getName(), Arrays.copyOf(info, info.length));
- }
-
- void write(DataOutputStream out) throws IOException
- {
- out.writeShort(name);
- out.writeInt(info.length);
- if (info.length > 0)
- out.write(info);
- }
-
- static int getLength(List<AttributeInfo> attributes) {
- int size = 0;
-
- for (AttributeInfo attr:attributes)
- size += attr.length();
-
- return size;
- }
-
- static AttributeInfo lookup(List<AttributeInfo> attributes, String name) {
- if (attributes == null)
- return null;
-
- for (AttributeInfo ai:attributes)
- if (ai.getName().equals(name))
- return ai;
-
- return null; // no such attribute
- }
-
- static synchronized AttributeInfo remove(List<AttributeInfo> attributes, String name) {
- if (attributes == null)
- return null;
-
- for (AttributeInfo ai:attributes)
- if (ai.getName().equals(name))
- if (attributes.remove(ai))
- return ai;
-
- return null;
- }
-
- static void writeAll(List<AttributeInfo> attributes, DataOutputStream out)
- throws IOException
- {
- if (attributes == null)
- return;
-
- for (AttributeInfo attr:attributes)
- attr.write(out);
- }
-
- static List<AttributeInfo> copyAll(List<AttributeInfo> attributes, ConstPool cp) {
- if (attributes == null)
- return null;
-
- List<AttributeInfo> newList = new ArrayList<AttributeInfo>();
- for (AttributeInfo attr:attributes)
- newList.add(attr.copy(cp, null));
-
- return newList;
- }
-
- /* The following two methods are used to implement
- * ClassFile.renameClass().
- * Only CodeAttribute, LocalVariableAttribute,
- * AnnotationsAttribute, and SignatureAttribute
- * override these methods.
- */
- void renameClass(String oldname, String newname) {}
- void renameClass(Map<String,String> classnames) {}
-
- static void renameClass(List<AttributeInfo> attributes, String oldname, String newname) {
- if (attributes == null)
- return;
-
- for (AttributeInfo ai:attributes)
- ai.renameClass(oldname, newname);
- }
-
- static void renameClass(List<AttributeInfo> attributes, Map<String,String> classnames) {
- if (attributes == null)
- return;
-
- for (AttributeInfo ai:attributes)
- ai.renameClass(classnames);
- }
-
- void getRefClasses(Map<String,String> classnames) {}
-
- static void getRefClasses(List<AttributeInfo> attributes, Map<String,String> classnames) {
- if (attributes == null)
- return;
-
- for (AttributeInfo ai:attributes)
- ai.getRefClasses(classnames);
- }
- }
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