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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) 2002 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, if |
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* any, must include the following acknowlegement: |
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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 acknowlegement may appear in the software itself, |
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* if and wherever such third-party acknowlegements normally appear. |
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* |
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* 4. The names "The Jakarta Project", "Ant", and "Apache Software |
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* Foundation" must not be used to endorse or promote products derived |
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* from this software without prior written permission. For written |
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* 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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* nor may "Apache" appear in their names without prior written |
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* permission of the Apache Group. |
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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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package org.apache.tools.ant.filters.util; |
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import java.io.ByteArrayInputStream; |
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import java.io.IOException; |
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import org.apache.bcel.classfile.ClassParser; |
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import org.apache.bcel.classfile.ConstantValue; |
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import org.apache.bcel.classfile.Field; |
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import org.apache.bcel.classfile.JavaClass; |
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/** |
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* Helper class that filters constants from a Java Class |
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* |
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* @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a> |
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*/ |
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public final class JavaClassHelper { |
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/** System specific line separator. */ |
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private static final String LS = System.getProperty("line.separator"); |
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/** |
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* Get the constants declared in a file as name=value |
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*/ |
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public static final StringBuffer getConstants(byte[] bytes) |
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throws IOException { |
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final StringBuffer sb = new StringBuffer(); |
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final ByteArrayInputStream bis = new ByteArrayInputStream(bytes); |
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final ClassParser parser = new ClassParser(bis, ""); |
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final JavaClass javaClass = parser.parse(); |
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final Field[] fields = javaClass.getFields(); |
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for (int i = 0; i < fields.length; i++) { |
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final Field field = fields[i]; |
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if (field != null) { |
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final ConstantValue cv = field.getConstantValue(); |
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if (cv != null) { |
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String cvs = cv.toString(); |
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//Remove start and end quotes if field is a String |
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if (cvs.startsWith("\"") && cvs.endsWith("\"")) { |
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cvs = cvs.substring(1, cvs.length() - 1); |
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} |
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sb.append(field.getName()); |
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sb.append('='); |
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sb.append(cvs); |
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sb.append(LS); |
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} |
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} |
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} |
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return sb; |
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} |
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} |
Magesh Umasankar