| /* |
| * 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.IOException; |
| import java.io.Reader; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| |
| /** |
| * Assembles the constants declared in a Java class in |
| * <code>key1=value1(line separator)key2=value2</code> |
| * format. |
| *<p> |
| * Notes: |
| * <ol> |
| * <li>This filter uses the BCEL external toolkit. |
| * <li>This assembles only those constants that are not created |
| * using the syntax <code>new whatever()</code> |
| * <li>This assembles constants declared using the basic datatypes |
| * and String only.</li> |
| * <li>The access modifiers of the declared constants do not matter.</li> |
| *</ol> |
| * Example:<br> |
| * <pre><classconstants/></pre> |
| * Or: |
| * <pre><filterreader classname="org.apache.tools.ant.filters.ClassConstants"/></pre> |
| * @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; |
| |
| /** Helper Class to be invoked via reflection. */ |
| private static final String JAVA_CLASS_HELPER = |
| "org.apache.tools.ant.filters.util.JavaClassHelper"; |
| |
| /** |
| * Constructor for "dummy" instances. |
| * |
| * @see BaseFilterReader#BaseFilterReader() |
| */ |
| public ClassConstants() { |
| super(); |
| } |
| |
| /** |
| * Creates a new filtered reader. The contents of the passed-in reader |
| * are expected to be the name of the class from which to produce a |
| * list of constants. |
| * |
| * @param in A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| */ |
| public ClassConstants(final Reader in) { |
| super(in); |
| } |
| |
| /** |
| * Reads and assembles the constants declared in a class file. |
| * |
| * @return the next character in the list of constants, or -1 |
| * if the end of the resulting stream has been reached |
| * |
| * @exception IOException if the underlying stream throws an IOException |
| * during reading, or if the constants for the specified class cannot |
| * be read (for example due to the class not being found). |
| */ |
| 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(); |
| try { |
| final Class javaClassHelper = |
| Class.forName(JAVA_CLASS_HELPER); |
| if (javaClassHelper != null) { |
| final Class params[] = { |
| byte[].class |
| }; |
| final Method getConstants = |
| javaClassHelper.getMethod("getConstants", params); |
| final Object[] args = { |
| bytes |
| }; |
| // getConstants is a static method, no need to |
| // pass in the object |
| final StringBuffer sb = (StringBuffer) |
| getConstants.invoke(null, args); |
| if (sb.length() > 0) { |
| queuedData = sb.toString(); |
| return read(); |
| } |
| } |
| } catch (ClassNotFoundException cnfe) { |
| throw new IOException(cnfe.getMessage()); |
| } catch (NoSuchMethodException nsme) { |
| throw new IOException(nsme.getMessage()); |
| } catch (IllegalAccessException iae) { |
| throw new IOException(iae.getMessage()); |
| } catch (IllegalArgumentException iarge) { |
| throw new IOException(iarge.getMessage()); |
| } catch (InvocationTargetException ite) { |
| throw new IOException(ite.getMessage()); |
| } |
| } |
| } |
| return ch; |
| } |
| |
| /** |
| * Creates a new ClassConstants using the passed in |
| * Reader for instantiation. |
| * |
| * @param rdr A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| * |
| * @return a new filter based on this configuration, but filtering |
| * the specified reader |
| */ |
| public final Reader chain(final Reader rdr) { |
| ClassConstants newFilter = new ClassConstants(rdr); |
| return newFilter; |
| } |
| } |