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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 org.apache.pulsar.shade.javassist.bytecode;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * field_info structure.
 *
 * 

The following code adds a public field width * of int type: *

 * ClassFile cf = ...
 * FieldInfo f = new FieldInfo(cf.getConstPool(), "width", "I");
 * f.setAccessFlags(AccessFlag.PUBLIC);
 * cf.addField(f);
 * 
* * @see javassist.CtField#getFieldInfo() */ public final class FieldInfo { ConstPool constPool; int accessFlags; int name; String cachedName; String cachedType; int descriptor; List attribute; // may be null. private FieldInfo(ConstPool cp) { constPool = cp; accessFlags = 0; attribute = null; } /** * Constructs a field_info structure. * * @param cp a constant pool table * @param fieldName field name * @param desc field descriptor * * @see Descriptor */ public FieldInfo(ConstPool cp, String fieldName, String desc) { this(cp); name = cp.addUtf8Info(fieldName); cachedName = fieldName; descriptor = cp.addUtf8Info(desc); } FieldInfo(ConstPool cp, DataInputStream in) throws IOException { this(cp); read(in); } /** * Returns a string representation of the object. */ @Override public String toString() { return getName() + " " + getDescriptor(); } /** * Copies all constant pool items to a given new constant pool * and replaces the original items with the new ones. * This is used for garbage collecting the items of removed fields * and methods. * * @param cp the destination */ void compact(ConstPool cp) { name = cp.addUtf8Info(getName()); descriptor = cp.addUtf8Info(getDescriptor()); attribute = AttributeInfo.copyAll(attribute, cp); constPool = cp; } void prune(ConstPool cp) { List newAttributes = new ArrayList(); AttributeInfo invisibleAnnotations = getAttribute(AnnotationsAttribute.invisibleTag); if (invisibleAnnotations != null) { invisibleAnnotations = invisibleAnnotations.copy(cp, null); newAttributes.add(invisibleAnnotations); } AttributeInfo visibleAnnotations = getAttribute(AnnotationsAttribute.visibleTag); if (visibleAnnotations != null) { visibleAnnotations = visibleAnnotations.copy(cp, null); newAttributes.add(visibleAnnotations); } AttributeInfo signature = getAttribute(SignatureAttribute.tag); if (signature != null) { signature = signature.copy(cp, null); newAttributes.add(signature); } int index = getConstantValue(); if (index != 0) { index = constPool.copy(index, cp, null); newAttributes.add(new ConstantAttribute(cp, index)); } attribute = newAttributes; name = cp.addUtf8Info(getName()); descriptor = cp.addUtf8Info(getDescriptor()); constPool = cp; } /** * Returns the constant pool table used * by this field_info. */ public ConstPool getConstPool() { return constPool; } /** * Returns the field name. */ public String getName() { if (cachedName == null) cachedName = constPool.getUtf8Info(name); return cachedName; } /** * Sets the field name. */ public void setName(String newName) { name = constPool.addUtf8Info(newName); cachedName = newName; } /** * Returns the access flags. * * @see AccessFlag */ public int getAccessFlags() { return accessFlags; } /** * Sets the access flags. * * @see AccessFlag */ public void setAccessFlags(int acc) { accessFlags = acc; } /** * Returns the field descriptor. * * @see Descriptor */ public String getDescriptor() { return constPool.getUtf8Info(descriptor); } /** * Sets the field descriptor. * * @see Descriptor */ public void setDescriptor(String desc) { if (!desc.equals(getDescriptor())) descriptor = constPool.addUtf8Info(desc); } /** * Finds a ConstantValue attribute and returns the index into * the constant_pool table. * * @return 0 if a ConstantValue attribute is not found. */ public int getConstantValue() { if ((accessFlags & AccessFlag.STATIC) == 0) return 0; ConstantAttribute attr = (ConstantAttribute)getAttribute(ConstantAttribute.tag); if (attr == null) return 0; return attr.getConstantValue(); } /** * Returns all the attributes. The returned List object * is shared with this object. If you add a new attribute to the list, * the attribute is also added to the field represented by this * object. If you remove an attribute from the list, it is also removed * from the field. * * @return a list of AttributeInfo objects. * @see AttributeInfo */ public List getAttributes() { if (attribute == null) attribute = new ArrayList(); return attribute; } /** * Returns the attribute with the specified name. * It returns null if the specified attribute is not found. * *

An attribute name can be obtained by, for example, * {@link AnnotationsAttribute#visibleTag} or * {@link AnnotationsAttribute#invisibleTag}. *

* * @param name attribute name * @see #getAttributes() */ public AttributeInfo getAttribute(String name) { return AttributeInfo.lookup(attribute, name); } /** * Removes an attribute with the specified name. * * @param name attribute name. * @return the removed attribute or null. * @since 3.21 */ public AttributeInfo removeAttribute(String name) { return AttributeInfo.remove(attribute, name); } /** * Appends an attribute. If there is already an attribute with * the same name, the new one substitutes for it. * * @see #getAttributes() */ public void addAttribute(AttributeInfo info) { if (attribute == null) attribute = new ArrayList(); AttributeInfo.remove(attribute, info.getName()); attribute.add(info); } private void read(DataInputStream in) throws IOException { accessFlags = in.readUnsignedShort(); name = in.readUnsignedShort(); descriptor = in.readUnsignedShort(); int n = in.readUnsignedShort(); attribute = new ArrayList(); for (int i = 0; i < n; ++i) attribute.add(AttributeInfo.read(constPool, in)); } void write(DataOutputStream out) throws IOException { out.writeShort(accessFlags); out.writeShort(name); out.writeShort(descriptor); if (attribute == null) out.writeShort(0); else { out.writeShort(attribute.size()); AttributeInfo.writeAll(attribute, out); } } }




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