001: /*
002: * CustomObjectInputStream.java
003: * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/util/CustomObjectInputStream.java,v 1.2 2001/07/22 20:25:13 pier Exp $
004: * $Revision: 1.2 $
005: * $Date: 2001/07/22 20:25:13 $
006: *
007: * ====================================================================
008: *
009: * The Apache Software License, Version 1.1
010: *
011: * Copyright (c) 1999 The Apache Software Foundation. All rights
012: * reserved.
013: *
014: * Redistribution and use in source and binary forms, with or without
015: * modification, are permitted provided that the following conditions
016: * are met:
017: *
018: * 1. Redistributions of source code must retain the above copyright
019: * notice, this list of conditions and the following disclaimer.
020: *
021: * 2. Redistributions in binary form must reproduce the above copyright
022: * notice, this list of conditions and the following disclaimer in
023: * the documentation and/or other materials provided with the
024: * distribution.
025: *
026: * 3. The end-user documentation included with the redistribution, if
027: * any, must include the following acknowlegement:
028: * "This product includes software developed by the
029: * Apache Software Foundation (http://www.apache.org/)."
030: * Alternately, this acknowlegement may appear in the software itself,
031: * if and wherever such third-party acknowlegements normally appear.
032: *
033: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
034: * Foundation" must not be used to endorse or promote products derived
035: * from this software without prior written permission. For written
036: * permission, please contact apache@@apache.org.
037: *
038: * 5. Products derived from this software may not be called "Apache"
039: * nor may "Apache" appear in their names without prior written
040: * permission of the Apache Group.
041: *
042: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
043: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
044: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
045: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
046: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
047: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
048: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
049: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
050: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
051: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
052: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
053: * SUCH DAMAGE.
054: * ====================================================================
055: *
056: * This software consists of voluntary contributions made by many
057: * individuals on behalf of the Apache Software Foundation. For more
058: * information on the Apache Software Foundation, please see
059: * <http://www.apache.org/>.
060: *
061: * [Additional notices, if required by prior licensing conditions]
062: *
063: */
064:
065: package org.apache.catalina.util;
066:
067: import java.io.InputStream;
068: import java.io.IOException;
069: import java.io.ObjectInputStream;
070: import java.io.ObjectStreamClass;
071:
072: /**
073: * Custom subclass of <code>ObjectInputStream</code> that loads from the
074: * class loader for this web application. This allows classes defined only
075: * with the web application to be found correctly.
076: *
077: * @@author Craig R. McClanahan
078: * @@author Bip Thelin
079: * @@version $Revision: 1.2 $, $Date: 2001/07/22 20:25:13 $
080: */
081:
082: public final class CustomObjectInputStream extends ObjectInputStream {
083:
084: /**
085: * The class loader we will use to resolve classes.
086: */
087: private ClassLoader classLoader = null;
088:
089: /**
090: * Construct a new instance of CustomObjectInputStream
091: *
092: * @@param stream The input stream we will read from
093: * @@param classLoader The class loader used to instantiate objects
094: *
095: * @@exception IOException if an input/output error occurs
096: */
097: public CustomObjectInputStream(InputStream stream,
098: ClassLoader classLoader) throws IOException {
099:
100: super (stream);
101: this .classLoader = classLoader;
102: }
103:
104: /**
105: * Load the local class equivalent of the specified stream class
106: * description, by using the class loader assigned to this Context.
107: *
108: * @@param classDesc Class description from the input stream
109: *
110: * @@exception ClassNotFoundException if this class cannot be found
111: * @@exception IOException if an input/output error occurs
112: */
113: public Class resolveClass(ObjectStreamClass classDesc)
114: throws ClassNotFoundException, IOException {
115:
116: return (classLoader.loadClass(classDesc.getName()));
117: }
118: }
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