| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2002 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 acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" 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" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * 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/>. |
| */ |
| package org.apache.tools.ant.filters; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.filters.util.JavaClassHelper; |
| |
| /** |
| * Assemble the constants declared in a Java class in |
| * key1=value1(line separator)key2=value2 |
| * format |
| * |
| * Notes: |
| * ===== |
| * 1. This filter uses the BCEL external toolkit. |
| * 2. This assembles only those constants that are not created |
| * using the syntax new whatever(). |
| * 3. This assembles constants declared using the basic datatypes |
| * and String only. |
| * 4. The access modifiers of the declared constants do not matter. |
| * |
| * Example: |
| * ======= |
| * |
| * <classconstants/> |
| * |
| * Or: |
| * |
| * <filterreader classname="org.apache.tools.ant.filters.ClassConstants"/> |
| * |
| * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a> |
| */ |
| public final class ClassConstants |
| extends BaseFilterReader |
| implements ChainableReader |
| { |
| /** Data that must be read from, if not null. */ |
| private String queuedData = null; |
| |
| /** |
| * This constructor is a dummy constructor and is |
| * not meant to be used by any class other than Ant's |
| * introspection mechanism. This will close the filter |
| * that is created making it useless for further operations. |
| */ |
| public ClassConstants() { |
| super(); |
| } |
| |
| /** |
| * Create a new filtered reader. |
| * |
| * @param in a Reader object providing the underlying stream. |
| */ |
| public ClassConstants(final Reader in) { |
| super(in); |
| } |
| |
| /** |
| * Read and assemble the constants declared in a class file. |
| */ |
| public final int read() throws IOException { |
| |
| int ch = -1; |
| |
| if (queuedData != null && queuedData.length() == 0) { |
| queuedData = null; |
| } |
| |
| if (queuedData != null) { |
| ch = queuedData.charAt(0); |
| queuedData = queuedData.substring(1); |
| if (queuedData.length() == 0) { |
| queuedData = null; |
| } |
| } else { |
| final String clazz = readFully(); |
| if (clazz == null) { |
| ch = -1; |
| } else { |
| final byte[] bytes = clazz.getBytes(); |
| final StringBuffer sb = JavaClassHelper.getConstants(bytes); |
| if (sb.length() > 0) { |
| queuedData = sb.toString(); |
| return read(); |
| } |
| } |
| } |
| return ch; |
| } |
| |
| /** |
| * Create a new ClassConstants using the passed in |
| * Reader for instantiation. |
| */ |
| public final Reader chain(final Reader rdr) { |
| ClassConstants newFilter = new ClassConstants(rdr); |
| return newFilter; |
| } |
| } |