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/*
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* reserved comment block
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* DO NOT REMOVE OR ALTER!
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*/
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package com.sun.org.apache.bcel.internal.generic;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import com.sun.org.apache.bcel.internal.classfile.*;
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import java.util.ArrayList;
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import java.util.Iterator;
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/**
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* Template class for building up a field. The only extraordinary thing
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* one can do is to add a constant value attribute to a field (which must of
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* course be compatible with to the declared type).
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see Field
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*/
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public class FieldGen extends FieldGenOrMethodGen {
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private Object value = null;
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/**
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* Declare a field. If it is static (isStatic() == true) and has a
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* basic type like int or String it may have an initial value
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* associated with it as defined by setInitValue().
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*
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* @param access_flags access qualifiers
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* @param type field type
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* @param name field name
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* @param cp constant pool
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*/
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public FieldGen(int access_flags, Type type, String name, ConstantPoolGen cp) {
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setAccessFlags(access_flags);
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setType(type);
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setName(name);
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setConstantPool(cp);
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}
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/**
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* Instantiate from existing field.
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*
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* @param field Field object
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* @param cp constant pool (must contain the same entries as the field's constant pool)
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*/
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public FieldGen(Field field, ConstantPoolGen cp) {
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this(field.getAccessFlags(), Type.getType(field.getSignature()), field.getName(), cp);
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Attribute[] attrs = field.getAttributes();
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for(int i=0; i < attrs.length; i++) {
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if(attrs[i] instanceof ConstantValue)
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setValue(((ConstantValue)attrs[i]).getConstantValueIndex());
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else
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addAttribute(attrs[i]);
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}
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}
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private void setValue(int index) {
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ConstantPool cp = this.cp.getConstantPool();
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Constant c = cp.getConstant(index);
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value = ((ConstantObject)c).getConstantValue(cp);
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}
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/**
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* Set (optional) initial value of field, otherwise it will be set to null/0/false
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* by the JVM automatically.
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*/
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public void setInitValue(String str) {
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checkType(new ObjectType("java.lang.String"));
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if(str != null)
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value = str;
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}
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public void setInitValue(long l) {
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checkType(Type.LONG);
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if(l != 0L)
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value = new Long(l);
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}
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public void setInitValue(int i) {
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checkType(Type.INT);
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if(i != 0)
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value = new Integer(i);
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}
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public void setInitValue(short s) {
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checkType(Type.SHORT);
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if(s != 0)
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value = new Integer(s);
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}
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public void setInitValue(char c) {
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checkType(Type.CHAR);
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if(c != 0)
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value = new Integer(c);
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}
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public void setInitValue(byte b) {
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checkType(Type.BYTE);
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if(b != 0)
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value = new Integer(b);
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}
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public void setInitValue(boolean b) {
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checkType(Type.BOOLEAN);
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if(b)
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value = new Integer(1);
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}
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public void setInitValue(float f) {
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checkType(Type.FLOAT);
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if(f != 0.0)
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value = new Float(f);
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}
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public void setInitValue(double d) {
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checkType(Type.DOUBLE);
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if(d != 0.0)
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value = new Double(d);
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}
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/** Remove any initial value.
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*/
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public void cancelInitValue() {
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value = null;
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}
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private void checkType(Type atype) {
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if(type == null)
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throw new ClassGenException("You haven't defined the type of the field yet");
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if(!isFinal())
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throw new ClassGenException("Only final fields may have an initial value!");
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if(!type.equals(atype))
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throw new ClassGenException("Types are not compatible: " + type + " vs. " + atype);
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}
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/**
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* Get field object after having set up all necessary values.
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*/
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public Field getField() {
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String signature = getSignature();
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int name_index = cp.addUtf8(name);
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int signature_index = cp.addUtf8(signature);
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if(value != null) {
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checkType(type);
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int index = addConstant();
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addAttribute(new ConstantValue(cp.addUtf8("ConstantValue"),
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2, index, cp.getConstantPool()));
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}
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return new Field(access_flags, name_index, signature_index, getAttributes(),
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cp.getConstantPool());
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}
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private int addConstant() {
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switch(type.getType()) {
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case Constants.T_INT: case Constants.T_CHAR: case Constants.T_BYTE:
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case Constants.T_BOOLEAN: case Constants.T_SHORT:
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return cp.addInteger(((Integer)value).intValue());
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case Constants.T_FLOAT:
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return cp.addFloat(((Float)value).floatValue());
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case Constants.T_DOUBLE:
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return cp.addDouble(((Double)value).doubleValue());
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case Constants.T_LONG:
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return cp.addLong(((Long)value).longValue());
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case Constants.T_REFERENCE:
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return cp.addString(((String)value));
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default:
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throw new RuntimeException("Oops: Unhandled : " + type.getType());
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}
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}
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public String getSignature() { return type.getSignature(); }
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private ArrayList observers;
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/** Add observer for this object.
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*/
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public void addObserver(FieldObserver o) {
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if(observers == null)
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observers = new ArrayList();
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observers.add(o);
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}
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/** Remove observer for this object.
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*/
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public void removeObserver(FieldObserver o) {
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if(observers != null)
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observers.remove(o);
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}
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/** Call notify() method on all observers. This method is not called
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* automatically whenever the state has changed, but has to be
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* called by the user after he has finished editing the object.
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*/
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public void update() {
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if(observers != null)
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for(Iterator e = observers.iterator(); e.hasNext(); )
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((FieldObserver)e.next()).notify(this);
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}
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public String getInitValue() {
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if(value != null) {
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return value.toString();
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} else
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return null;
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}
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/**
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* Return string representation close to declaration format,
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* `public static final short MAX = 100', e.g..
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*
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* @return String representation of field
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*/
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public final String toString() {
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String name, signature, access; // Short cuts to constant pool
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access = Utility.accessToString(access_flags);
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access = access.equals("")? "" : (access + " ");
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signature = type.toString();
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name = getName();
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StringBuffer buf = new StringBuffer(access + signature + " " + name);
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String value = getInitValue();
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if(value != null)
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buf.append(" = " + value);
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return buf.toString();
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}
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/** @return deep copy of this field
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*/
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public FieldGen copy(ConstantPoolGen cp) {
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FieldGen fg = (FieldGen)clone();
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fg.setConstantPool(cp);
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return fg;
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}
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}
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