--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jaxp/src/share/classes/com/sun/org/apache/bcel/internal/generic/FieldGen.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,313 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+package com.sun.org.apache.bcel.internal.generic;
+
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2001 The Apache Software Foundation. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ * if any, must include the following acknowledgment:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowledgment may appear in the software itself,
+ * if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" and
+ * "Apache BCEL" must not be used to endorse or promote products
+ * derived from this software without prior written permission. For
+ * written permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ * "Apache BCEL", nor may "Apache" appear in their name, without
+ * prior written permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+import com.sun.org.apache.bcel.internal.Constants;
+import com.sun.org.apache.bcel.internal.classfile.*;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * Template class for building up a field. The only extraordinary thing
+ * one can do is to add a constant value attribute to a field (which must of
+ * course be compatible with to the declared type).
+ *
+ * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
+ * @see Field
+ */
+public class FieldGen extends FieldGenOrMethodGen {
+ private Object value = null;
+
+ /**
+ * Declare a field. If it is static (isStatic() == true) and has a
+ * basic type like int or String it may have an initial value
+ * associated with it as defined by setInitValue().
+ *
+ * @param access_flags access qualifiers
+ * @param type field type
+ * @param name field name
+ * @param cp constant pool
+ */
+ public FieldGen(int access_flags, Type type, String name, ConstantPoolGen cp) {
+ setAccessFlags(access_flags);
+ setType(type);
+ setName(name);
+ setConstantPool(cp);
+ }
+
+ /**
+ * Instantiate from existing field.
+ *
+ * @param field Field object
+ * @param cp constant pool (must contain the same entries as the field's constant pool)
+ */
+ public FieldGen(Field field, ConstantPoolGen cp) {
+ this(field.getAccessFlags(), Type.getType(field.getSignature()), field.getName(), cp);
+
+ Attribute[] attrs = field.getAttributes();
+
+ for(int i=0; i < attrs.length; i++) {
+ if(attrs[i] instanceof ConstantValue)
+ setValue(((ConstantValue)attrs[i]).getConstantValueIndex());
+ else
+ addAttribute(attrs[i]);
+ }
+ }
+
+ private void setValue(int index) {
+ ConstantPool cp = this.cp.getConstantPool();
+ Constant c = cp.getConstant(index);
+ value = ((ConstantObject)c).getConstantValue(cp);
+ }
+
+ /**
+ * Set (optional) initial value of field, otherwise it will be set to null/0/false
+ * by the JVM automatically.
+ */
+ public void setInitValue(String str) {
+ checkType(new ObjectType("java.lang.String"));
+
+ if(str != null)
+ value = str;
+ }
+
+ public void setInitValue(long l) {
+ checkType(Type.LONG);
+
+ if(l != 0L)
+ value = new Long(l);
+ }
+
+ public void setInitValue(int i) {
+ checkType(Type.INT);
+
+ if(i != 0)
+ value = new Integer(i);
+ }
+
+ public void setInitValue(short s) {
+ checkType(Type.SHORT);
+
+ if(s != 0)
+ value = new Integer(s);
+ }
+
+ public void setInitValue(char c) {
+ checkType(Type.CHAR);
+
+ if(c != 0)
+ value = new Integer(c);
+ }
+
+ public void setInitValue(byte b) {
+ checkType(Type.BYTE);
+
+ if(b != 0)
+ value = new Integer(b);
+ }
+
+ public void setInitValue(boolean b) {
+ checkType(Type.BOOLEAN);
+
+ if(b)
+ value = new Integer(1);
+ }
+
+ public void setInitValue(float f) {
+ checkType(Type.FLOAT);
+
+ if(f != 0.0)
+ value = new Float(f);
+ }
+
+ public void setInitValue(double d) {
+ checkType(Type.DOUBLE);
+
+ if(d != 0.0)
+ value = new Double(d);
+ }
+
+ /** Remove any initial value.
+ */
+ public void cancelInitValue() {
+ value = null;
+ }
+
+ private void checkType(Type atype) {
+ if(type == null)
+ throw new ClassGenException("You haven't defined the type of the field yet");
+
+ if(!isFinal())
+ throw new ClassGenException("Only final fields may have an initial value!");
+
+ if(!type.equals(atype))
+ throw new ClassGenException("Types are not compatible: " + type + " vs. " + atype);
+ }
+
+ /**
+ * Get field object after having set up all necessary values.
+ */
+ public Field getField() {
+ String signature = getSignature();
+ int name_index = cp.addUtf8(name);
+ int signature_index = cp.addUtf8(signature);
+
+ if(value != null) {
+ checkType(type);
+ int index = addConstant();
+ addAttribute(new ConstantValue(cp.addUtf8("ConstantValue"),
+ 2, index, cp.getConstantPool()));
+ }
+
+ return new Field(access_flags, name_index, signature_index, getAttributes(),
+ cp.getConstantPool());
+ }
+
+ private int addConstant() {
+ switch(type.getType()) {
+ case Constants.T_INT: case Constants.T_CHAR: case Constants.T_BYTE:
+ case Constants.T_BOOLEAN: case Constants.T_SHORT:
+ return cp.addInteger(((Integer)value).intValue());
+
+ case Constants.T_FLOAT:
+ return cp.addFloat(((Float)value).floatValue());
+
+ case Constants.T_DOUBLE:
+ return cp.addDouble(((Double)value).doubleValue());
+
+ case Constants.T_LONG:
+ return cp.addLong(((Long)value).longValue());
+
+ case Constants.T_REFERENCE:
+ return cp.addString(((String)value));
+
+ default:
+ throw new RuntimeException("Oops: Unhandled : " + type.getType());
+ }
+ }
+
+ public String getSignature() { return type.getSignature(); }
+
+ private ArrayList observers;
+
+ /** Add observer for this object.
+ */
+ public void addObserver(FieldObserver o) {
+ if(observers == null)
+ observers = new ArrayList();
+
+ observers.add(o);
+ }
+
+ /** Remove observer for this object.
+ */
+ public void removeObserver(FieldObserver o) {
+ if(observers != null)
+ observers.remove(o);
+ }
+
+ /** Call notify() method on all observers. This method is not called
+ * automatically whenever the state has changed, but has to be
+ * called by the user after he has finished editing the object.
+ */
+ public void update() {
+ if(observers != null)
+ for(Iterator e = observers.iterator(); e.hasNext(); )
+ ((FieldObserver)e.next()).notify(this);
+ }
+
+ public String getInitValue() {
+ if(value != null) {
+ return value.toString();
+ } else
+ return null;
+ }
+
+ /**
+ * Return string representation close to declaration format,
+ * `public static final short MAX = 100', e.g..
+ *
+ * @return String representation of field
+ */
+ public final String toString() {
+ String name, signature, access; // Short cuts to constant pool
+
+ access = Utility.accessToString(access_flags);
+ access = access.equals("")? "" : (access + " ");
+ signature = type.toString();
+ name = getName();
+
+ StringBuffer buf = new StringBuffer(access + signature + " " + name);
+ String value = getInitValue();
+
+ if(value != null)
+ buf.append(" = " + value);
+
+ return buf.toString();
+ }
+
+ /** @return deep copy of this field
+ */
+ public FieldGen copy(ConstantPoolGen cp) {
+ FieldGen fg = (FieldGen)clone();
+
+ fg.setConstantPool(cp);
+ return fg;
+ }
+}