https://commons.apache.org/proper/commons-bcel: Apache Commons Bytecode Engineering Library (The Apache Software Foundation)
  • Enver Haase
  • David Dixon-Peugh
  • Patrick Beard
  • Conor MacNeill
  • Costin Manolache
  • Bill Pugh
  • First Hop Ltd / Torsten Rueger
  • Jérôme Leroux
  • Mark Roberts
  • Sam Yoon
  • Dave Brosius
  • Torsten Curdt (ASF)
  • Markus Dahm (it-frameworksolutions)
  • Jason van Zyl
  • Gary Gregory (Rocket Software) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.bcel.util;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import org.apache.bcel.Const;
import org.apache.bcel.classfile.Attribute;
import org.apache.bcel.classfile.Code;
import org.apache.bcel.classfile.ConstantValue;
import org.apache.bcel.classfile.ExceptionTable;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.classfile.Utility;


Convert methods and fields into HTML file.

/**
 * Convert methods and fields into HTML file.
 *
 *
 */
final class MethodHTML {

    private final String class_name; // name of current class
    private final PrintWriter file; // file to write to
    private final ConstantHTML constant_html;
    private final AttributeHTML attribute_html;


    MethodHTML(final String dir, final String class_name, final Method[] methods, final Field[] fields,
            final ConstantHTML constant_html, final AttributeHTML attribute_html) throws IOException {
        this.class_name = class_name;
        this.attribute_html = attribute_html;
        this.constant_html = constant_html;
        file = new PrintWriter(new FileOutputStream(dir + class_name + "_methods.html"));
        file.println("<HTML><BODY BGCOLOR=\"#C0C0C0\"><TABLE BORDER=0>");
        file.println("<TR><TH ALIGN=LEFT>Access&nbsp;flags</TH><TH ALIGN=LEFT>Type</TH>"
                + "<TH ALIGN=LEFT>Field&nbsp;name</TH></TR>");
        for (final Field field : fields) {
            writeField(field);
        }
        file.println("</TABLE>");
        file.println("<TABLE BORDER=0><TR><TH ALIGN=LEFT>Access&nbsp;flags</TH>"
                + "<TH ALIGN=LEFT>Return&nbsp;type</TH><TH ALIGN=LEFT>Method&nbsp;name</TH>"
                + "<TH ALIGN=LEFT>Arguments</TH></TR>");
        for (int i = 0; i < methods.length; i++) {
            writeMethod(methods[i], i);
        }
        file.println("</TABLE></BODY></HTML>");
        file.close();
    }


    
Print field of class.

Params:
  • field – field to print
Throws:
/**
     * Print field of class.
     *
     * @param field field to print
     * @throws java.io.IOException
     */
    private void writeField( final Field field ) throws IOException {
        final String type = Utility.signatureToString(field.getSignature());
        final String name = field.getName();
        String access = Utility.accessToString(field.getAccessFlags());
        Attribute[] attributes;
        access = Utility.replace(access, " ", "&nbsp;");
        file.print("<TR><TD><FONT COLOR=\"#FF0000\">" + access + "</FONT></TD>\n<TD>"
                + Class2HTML.referenceType(type) + "</TD><TD><A NAME=\"field" + name + "\">" + name
                + "</A></TD>");
        attributes = field.getAttributes();
        // Write them to the Attributes.html file with anchor "<name>[<i>]"
        for (int i = 0; i < attributes.length; i++) {
            attribute_html.writeAttribute(attributes[i], name + "@" + i);
        }
        for (int i = 0; i < attributes.length; i++) {
            if (attributes[i].getTag() == Const.ATTR_CONSTANT_VALUE) { // Default value
                final String str = ((ConstantValue) attributes[i]).toString();
                // Reference attribute in _attributes.html
                file.print("<TD>= <A HREF=\"" + class_name + "_attributes.html#" + name + "@" + i
                        + "\" TARGET=\"Attributes\">" + str + "</TD>\n");
                break;
            }
        }
        file.println("</TR>");
    }


    private void writeMethod( final Method method, final int method_number ) {
        // Get raw signature
        final String signature = method.getSignature();
        // Get array of strings containing the argument types
        final String[] args = Utility.methodSignatureArgumentTypes(signature, false);
        // Get return type string
        final String type = Utility.methodSignatureReturnType(signature, false);
        // Get method name
        final String name = method.getName();
        String html_name;
        // Get method's access flags
        String access = Utility.accessToString(method.getAccessFlags());
        // Get the method's attributes, the Code Attribute in particular
        final Attribute[] attributes = method.getAttributes();
        /* HTML doesn't like names like <clinit> and spaces are places to break
         * lines. Both we don't want...
         */
        access = Utility.replace(access, " ", "&nbsp;");
        html_name = Class2HTML.toHTML(name);
        file.print("<TR VALIGN=TOP><TD><FONT COLOR=\"#FF0000\"><A NAME=method" + method_number
                + ">" + access + "</A></FONT></TD>");
        file.print("<TD>" + Class2HTML.referenceType(type) + "</TD><TD>" + "<A HREF=" + class_name
                + "_code.html#method" + method_number + " TARGET=Code>" + html_name
                + "</A></TD>\n<TD>(");
        for (int i = 0; i < args.length; i++) {
            file.print(Class2HTML.referenceType(args[i]));
            if (i < args.length - 1) {
                file.print(", ");
            }
        }
        file.print(")</TD></TR>");
        // Check for thrown exceptions
        for (int i = 0; i < attributes.length; i++) {
            attribute_html.writeAttribute(attributes[i], "method" + method_number + "@" + i,
                    method_number);
            final byte tag = attributes[i].getTag();
            if (tag == Const.ATTR_EXCEPTIONS) {
                file.print("<TR VALIGN=TOP><TD COLSPAN=2></TD><TH ALIGN=LEFT>throws</TH><TD>");
                final int[] exceptions = ((ExceptionTable) attributes[i]).getExceptionIndexTable();
                for (int j = 0; j < exceptions.length; j++) {
                    file.print(constant_html.referenceConstant(exceptions[j]));
                    if (j < exceptions.length - 1) {
                        file.print(", ");
                    }
                }
                file.println("</TD></TR>");
            } else if (tag == Const.ATTR_CODE) {
                final Attribute[] c_a = ((Code) attributes[i]).getAttributes();
                for (int j = 0; j < c_a.length; j++) {
                    attribute_html.writeAttribute(c_a[j], "method" + method_number + "@" + i + "@"
                            + j, method_number);
                }
            }
        }
    }
}