FieldData.java

/*
 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.tools.javap;

import java.util.*;
import java.io.*;

/**
 * Strores field data informastion.
 *
 * @author  Sucheta Dambalkar (Adopted code from jdis)
 */

public class FieldData implements RuntimeConstants  {
    
    ClassData cls;
    int access;
    int name_index;
    int descriptor_index;
    int attributes_count;
    int value_cpx=0;
    boolean isSynthetic=false;
    boolean isDeprecated=false;
    Vector attrs; 
    
    public FieldData(ClassData cls){
	this.cls=cls;
    }
    
    /**
     * Read and store field info.
     */
    public void read(DataInputStream in) throws IOException {
	access = in.readUnsignedShort();
	name_index = in.readUnsignedShort();
	descriptor_index = in.readUnsignedShort();
	// Read the attributes
	int attributes_count = in.readUnsignedShort();
	attrs=new Vector(attributes_count);
	for (int i = 0; i < attributes_count; i++) {
	    int attr_name_index=in.readUnsignedShort();
	    if (cls.getTag(attr_name_index)!=CONSTANT_UTF8) continue;
	    String attr_name=cls.getString(attr_name_index);
	    if (attr_name.equals("ConstantValue")){
		if (in.readInt()!=2) 
		    throw new ClassFormatError("invalid ConstantValue attr length");
		value_cpx=in.readUnsignedShort();
		AttrData attr=new AttrData(cls);
		attr.read(attr_name_index);
		attrs.addElement(attr);
	    } else if (attr_name.equals("Synthetic")){
		if (in.readInt()!=0) 
		    throw new ClassFormatError("invalid Synthetic attr length");
		isSynthetic=true;
		AttrData attr=new AttrData(cls);
		attr.read(attr_name_index);
		attrs.addElement(attr);
	    } else if (attr_name.equals("Deprecated")){ 
		if (in.readInt()!=0) 
		    throw new ClassFormatError("invalid Synthetic attr length");
		isDeprecated = true;
		AttrData attr=new AttrData(cls);
		attr.read(attr_name_index);
		attrs.addElement(attr);
	    } else {
		AttrData attr=new AttrData(cls);
		attr.read(attr_name_index, in);
		attrs.addElement(attr);
	    }
	}
	
    }  // end read
    
    /**
     * Returns access of a field.
     */
    public String[] getAccess(){
	Vector v = new Vector();
	if ((access & ACC_PUBLIC)   !=0) v.addElement("public");
	if ((access & ACC_PRIVATE)   !=0) v.addElement("private");
	if ((access & ACC_PROTECTED)   !=0) v.addElement("protected");
	if ((access & ACC_STATIC)   !=0) v.addElement("static");
	if ((access & ACC_FINAL)    !=0) v.addElement("final");
	if ((access & ACC_VOLATILE) !=0) v.addElement("volatile");
	if ((access & ACC_TRANSIENT) !=0) v.addElement("transient");
	String[] accflags = new String[v.size()];
	v.copyInto(accflags);
	return accflags;
    }
    
    /**
     * Returns name of a field.
     */
    public String getName(){
	return cls.getStringValue(name_index);
    }
    
    /**
     * Returns internal signature of a field
     */
    public String getInternalSig(){
	return cls.getStringValue(descriptor_index);
    }
    
    /**
     * Returns java type signature of a field.
     */
    public String getType(){
	return new TypeSignature(getInternalSig()).getFieldType();
    }
    
    /**
     * Returns true if field is synthetic.
     */
    public boolean isSynthetic(){
	return isSynthetic;
    }
    
    /**
     * Returns true if field is deprecated.
     */
    public boolean isDeprecated(){
	return isDeprecated;
    }
    
    /**
     * Returns index of constant value in cpool.
     */
    public int getConstantValueIndex(){
	return (value_cpx);
    }
    
    /**
     * Returns list of attributes of field.
     */
    public Vector getAttributes(){
	return attrs;
    }
}