001: /*
002: * Copyright (c) 2001-2004 Caucho Technology, Inc. All rights reserved.
003: *
004: * The Apache Software License, Version 1.1
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution, if
019: * any, must include the following acknowlegement:
020: * "This product includes software developed by the
021: * Caucho Technology (http://www.caucho.com/)."
022: * Alternately, this acknowlegement may appear in the software itself,
023: * if and wherever such third-party acknowlegements normally appear.
024: *
025: * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
026: * endorse or promote products derived from this software without prior
027: * written permission. For written permission, please contact
028: * info@caucho.com.
029: *
030: * 5. Products derived from this software may not be called "Resin"
031: * nor may "Resin" appear in their names without prior written
032: * permission of Caucho Technology.
033: *
034: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
035: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
036: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
037: * DISCLAIMED. IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
038: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
039: * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
040: * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
041: * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
042: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
043: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
044: * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
045: *
046: * @author Scott Ferguson
047: */
048:
049: package com.caucho.hessian.io;
050:
051: import java.io.IOException;
052: import java.io.InputStream;
053: import java.lang.reflect.Field;
054: import java.lang.reflect.Method;
055: import java.lang.reflect.Modifier;
056: import java.util.ArrayList;
057: import java.util.HashMap;
058:
059: /**
060: * Input stream for Hessian requests, deserializing objects using the
061: * java.io.Serialization protocol.
062: *
063: * <p>HessianSerializerInput is unbuffered, so any client needs to provide
064: * its own buffering.
065: *
066: * <h3>Serialization</h3>
067: *
068: * <pre>
069: * InputStream is = new FileInputStream("test.xml");
070: * HessianOutput in = new HessianSerializerOutput(is);
071: *
072: * Object obj = in.readObject();
073: * is.close();
074: * </pre>
075: *
076: * <h3>Parsing a Hessian reply</h3>
077: *
078: * <pre>
079: * InputStream is = ...; // from http connection
080: * HessianInput in = new HessianSerializerInput(is);
081: * String value;
082: *
083: * in.startReply(); // read reply header
084: * value = in.readString(); // read string value
085: * in.completeReply(); // read reply footer
086: * </pre>
087: */
088: public class HessianSerializerInput extends HessianInput {
089: /**
090: * Creates a new Hessian input stream, initialized with an
091: * underlying input stream.
092: *
093: * @param is the underlying input stream.
094: */
095: public HessianSerializerInput(InputStream is) {
096: super (is);
097: }
098:
099: /**
100: * Creates an uninitialized Hessian input stream.
101: */
102: public HessianSerializerInput() {
103: }
104:
105: /**
106: * Reads an object from the input stream. cl is known not to be
107: * a Map.
108: */
109: protected Object readObjectImpl(Class cl) throws IOException {
110: try {
111: Object obj = cl.newInstance();
112:
113: if (_refs == null)
114: _refs = new ArrayList();
115: _refs.add(obj);
116:
117: HashMap fieldMap = getFieldMap(cl);
118:
119: int code = read();
120: for (; code >= 0 && code != 'z'; code = read()) {
121: _peek = code;
122:
123: Object key = readObject();
124:
125: Field field = (Field) fieldMap.get(key);
126:
127: if (field != null) {
128: Object value = readObject(field.getType());
129: field.set(obj, value);
130: } else {
131: Object value = readObject();
132: }
133: }
134:
135: if (code != 'z')
136: throw expect("map", code);
137:
138: // if there's a readResolve method, call it
139: try {
140: Method method = cl.getMethod("readResolve",
141: new Class[0]);
142: return method.invoke(obj, new Object[0]);
143: } catch (Exception e) {
144: }
145:
146: return obj;
147: } catch (IOException e) {
148: throw e;
149: } catch (Exception e) {
150: throw new IOExceptionWrapper(e);
151: }
152: }
153:
154: /**
155: * Creates a map of the classes fields.
156: */
157: protected HashMap getFieldMap(Class cl) {
158: HashMap fieldMap = new HashMap();
159:
160: for (; cl != null; cl = cl.getSuperclass()) {
161: Field[] fields = cl.getDeclaredFields();
162: for (int i = 0; i < fields.length; i++) {
163: Field field = fields[i];
164:
165: if (Modifier.isTransient(field.getModifiers())
166: || Modifier.isStatic(field.getModifiers()))
167: continue;
168:
169: // XXX: could parameterize the handler to only deal with public
170: field.setAccessible(true);
171:
172: fieldMap.put(field.getName(), field);
173: }
174: }
175:
176: return fieldMap;
177: }
178: }
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