Source Code Cross Referenced for ServletInputStream.java in  » Sevlet-Container » apache-tomcat-6.0.14 » javax » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » javax.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Licensed to the Apache Software Foundation (ASF) under one or more
03:         * contributor license agreements.  See the NOTICE file distributed with
04:         * this work for additional information regarding copyright ownership.
05:         * The ASF licenses this file to You under the Apache License, Version 2.0
06:         * (the "License"); you may not use this file except in compliance with
07:         * the License.  You may obtain a copy of the License at
08:         *
09:         *     http://www.apache.org/licenses/LICENSE-2.0
10:         *
11:         * Unless required by applicable law or agreed to in writing, software
12:         * distributed under the License is distributed on an "AS IS" BASIS,
13:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14:         * See the License for the specific language governing permissions and
15:         * limitations under the License.
16:         */
17:        package javax.servlet;
18:
19:        import java.io.InputStream;
20:        import java.io.IOException;
21:
22:        /**
23:         * 
24:         * Provides an input stream for reading binary data from a client
25:         * request, including an efficient <code>readLine</code> method
26:         * for reading data one line at a time. With some protocols, such
27:         * as HTTP POST and PUT, a <code>ServletInputStream</code>
28:         * object can be used to read data sent from the client.
29:         *
30:         * <p>A <code>ServletInputStream</code> object is normally retrieved via
31:         * the {@link ServletRequest#getInputStream} method.
32:         *
33:         *
34:         * <p>This is an abstract class that a servlet container implements.
35:         * Subclasses of this class
36:         * must implement the <code>java.io.InputStream.read()</code> method.
37:         *
38:         *
39:         * @author 	Various
40:         * @version 	$Version$
41:         *
42:         * @see		ServletRequest 
43:         *
44:         */
45:
46:        public abstract class ServletInputStream extends InputStream {
47:
48:            /**
49:             * Does nothing, because this is an abstract class.
50:             *
51:             */
52:
53:            protected ServletInputStream() {
54:            }
55:
56:            /**
57:             *
58:             * Reads the input stream, one line at a time. Starting at an
59:             * offset, reads bytes into an array, until it reads a certain number
60:             * of bytes or reaches a newline character, which it reads into the
61:             * array as well.
62:             *
63:             * <p>This method returns -1 if it reaches the end of the input
64:             * stream before reading the maximum number of bytes.
65:             *
66:             *
67:             *
68:             * @param b 		an array of bytes into which data is read
69:             *
70:             * @param off 		an integer specifying the character at which
71:             *				this method begins reading
72:             *
73:             * @param len		an integer specifying the maximum number of 
74:             *				bytes to read
75:             *
76:             * @return			an integer specifying the actual number of bytes 
77:             *				read, or -1 if the end of the stream is reached
78:             *
79:             * @exception IOException	if an input or output exception has occurred
80:             *
81:             */
82:
83:            public int readLine(byte[] b, int off, int len) throws IOException {
84:
85:                if (len <= 0) {
86:                    return 0;
87:                }
88:                int count = 0, c;
89:
90:                while ((c = read()) != -1) {
91:                    b[off++] = (byte) c;
92:                    count++;
93:                    if (c == '\n' || count == len) {
94:                        break;
95:                    }
96:                }
97:                return count > 0 ? count : -1;
98:            }
99:        }
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