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1
50 package org.apache.avalon.excalibur.monitor;
51
52 import java.io.IOException  ;
53 import java.io.InputStream ;
54 import java.io.InputStreamReader ;
55 import java.io.OutputStream ;
56 import java.io.Reader ;
57 import java.io.Writer ;
58
59 import org.apache.excalibur.source.Source;
60 import org.apache.excalibur.source.SourceException;
61 import org.apache.excalibur.source.SourceValidity;
62
63
67 public final class SourceResource
68 extends StreamResource
69 {
70
71 private final Source m_source;
72
73
74 private SourceValidity m_validity;
75
76
79 public SourceResource( final Source source )
80 throws Exception
81 {
82 super( source.getURI() );
83
84 m_source = source;
85 setPreviousModified( System.currentTimeMillis() );
86 m_validity = source.getValidity();
87 }
88
89
92 public long lastModified()
93 {
94 if( null == m_validity )
95 {
96 return System.currentTimeMillis();
97 }
98 else
99 {
100 int valid = m_validity.isValid();
101 boolean isValid = false;
102 SourceValidity newVal = null;
103 if ( valid == 0 ) {
104 m_source.refresh();
105 newVal = m_source.getValidity();
106 if( newVal != null)
107 {
108 valid = m_validity.isValid( newVal );
109 isValid = (valid == 1);
110 }
111 } else {
112 isValid = (valid == 1);
113 }
114 if ( isValid ) {
115 return getPreviousModified();
116 } else {
117 if ( null == newVal ) {
118 m_source.refresh();
119 m_validity = m_source.getValidity();
120 }
121 return System.currentTimeMillis();
122 }
123 }
124 }
125
126
129 public InputStream getResourceAsStream()
130 throws IOException
131 {
132 try
133 {
134 return m_source.getInputStream();
135 }
136 catch( SourceException se )
137 {
138 throw new IOException ( "SourceException: " + se.getMessage() );
139 }
140 }
141
142
145 public Reader getResourceAsReader()
146 throws IOException
147 {
148 return new InputStreamReader ( getResourceAsStream() );
149 }
150
151
154 public OutputStream setResourceAsStream()
155 throws IOException
156 {
157 throw new IOException ( "setResourceAsStream() not supported for URLResource" );
158 }
159
160
163 public Writer setResourceAsWriter()
164 throws IOException
165 {
166 throw new IOException ( "setResourceAsWriter() not supported for URLResource" );
167 }
168
169 public Source getSource()
170 {
171 return m_source;
172 }
173 }
174 |
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