Source Code Cross Referenced for Mark.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » jasper » compiler » 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 » org.apache.jasper.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.jasper.compiler;
018:
019:        import java.util.Stack;
020:        import java.net.URL;
021:        import java.net.MalformedURLException;
022:        import org.apache.jasper.JspCompilationContext;
023:
024:        /**
025:         * Mark represents a point in the JSP input. 
026:         *
027:         * @author Anil K. Vijendran
028:         */
029:        final class Mark {
030:
031:            // position within current stream
032:            int cursor, line, col;
033:
034:            // directory of file for current stream
035:            String baseDir;
036:
037:            // current stream
038:            char[] stream = null;
039:
040:            // fileid of current stream
041:            private int fileId;
042:
043:            // name of the current file
044:            private String fileName;
045:
046:            /*
047:             * stack of stream and stream state of streams that have included
048:             * current stream
049:             */
050:            private Stack includeStack = null;
051:
052:            // encoding of current file
053:            private String encoding = null;
054:
055:            // reader that owns this mark (so we can look up fileid's)
056:            private JspReader reader;
057:
058:            private JspCompilationContext ctxt;
059:
060:            /**
061:             * Constructor
062:             *
063:             * @param reader JspReader this mark belongs to
064:             * @param inStream current stream for this mark
065:             * @param fileId id of requested jsp file
066:             * @param name JSP file name
067:             * @param inBaseDir base directory of requested jsp file
068:             * @param inEncoding encoding of current file
069:             */
070:            Mark(JspReader reader, char[] inStream, int fileId, String name,
071:                    String inBaseDir, String inEncoding) {
072:
073:                this .reader = reader;
074:                this .ctxt = reader.getJspCompilationContext();
075:                this .stream = inStream;
076:                this .cursor = 0;
077:                this .line = 1;
078:                this .col = 1;
079:                this .fileId = fileId;
080:                this .fileName = name;
081:                this .baseDir = inBaseDir;
082:                this .encoding = inEncoding;
083:                this .includeStack = new Stack();
084:            }
085:
086:            /**
087:             * Constructor
088:             */
089:            Mark(Mark other) {
090:
091:                this .reader = other.reader;
092:                this .ctxt = other.reader.getJspCompilationContext();
093:                this .stream = other.stream;
094:                this .fileId = other.fileId;
095:                this .fileName = other.fileName;
096:                this .cursor = other.cursor;
097:                this .line = other.line;
098:                this .col = other.col;
099:                this .baseDir = other.baseDir;
100:                this .encoding = other.encoding;
101:
102:                // clone includeStack without cloning contents
103:                includeStack = new Stack();
104:                for (int i = 0; i < other.includeStack.size(); i++) {
105:                    includeStack.addElement(other.includeStack.elementAt(i));
106:                }
107:            }
108:
109:            /**
110:             * Constructor
111:             */
112:            Mark(JspCompilationContext ctxt, String filename, int line, int col) {
113:
114:                this .reader = null;
115:                this .ctxt = ctxt;
116:                this .stream = null;
117:                this .cursor = 0;
118:                this .line = line;
119:                this .col = col;
120:                this .fileId = -1;
121:                this .fileName = filename;
122:                this .baseDir = "le-basedir";
123:                this .encoding = "le-endocing";
124:                this .includeStack = null;
125:            }
126:
127:            /**
128:             * Sets this mark's state to a new stream.
129:             * It will store the current stream in it's includeStack.
130:             *
131:             * @param inStream new stream for mark
132:             * @param inFileId id of new file from which stream comes from
133:             * @param inBaseDir directory of file
134:             * @param inEncoding encoding of new file
135:             */
136:            public void pushStream(char[] inStream, int inFileId, String name,
137:                    String inBaseDir, String inEncoding) {
138:                // store current state in stack
139:                includeStack.push(new IncludeState(cursor, line, col, fileId,
140:                        fileName, baseDir, encoding, stream));
141:
142:                // set new variables
143:                cursor = 0;
144:                line = 1;
145:                col = 1;
146:                fileId = inFileId;
147:                fileName = name;
148:                baseDir = inBaseDir;
149:                encoding = inEncoding;
150:                stream = inStream;
151:            }
152:
153:            /**
154:             * Restores this mark's state to a previously stored stream.
155:             * @return The previous Mark instance when the stream was pushed, or null
156:             * if there is no previous stream
157:             */
158:            public Mark popStream() {
159:                // make sure we have something to pop
160:                if (includeStack.size() <= 0) {
161:                    return null;
162:                }
163:
164:                // get previous state in stack
165:                IncludeState state = (IncludeState) includeStack.pop();
166:
167:                // set new variables
168:                cursor = state.cursor;
169:                line = state.line;
170:                col = state.col;
171:                fileId = state.fileId;
172:                fileName = state.fileName;
173:                baseDir = state.baseDir;
174:                stream = state.stream;
175:                return this ;
176:            }
177:
178:            // -------------------- Locator interface --------------------
179:
180:            public int getLineNumber() {
181:                return line;
182:            }
183:
184:            public int getColumnNumber() {
185:                return col;
186:            }
187:
188:            public String getSystemId() {
189:                return getFile();
190:            }
191:
192:            public String getPublicId() {
193:                return null;
194:            }
195:
196:            public String toString() {
197:                return getFile() + "(" + line + "," + col + ")";
198:            }
199:
200:            public String getFile() {
201:                return this .fileName;
202:            }
203:
204:            /**
205:             * Gets the URL of the resource with which this Mark is associated
206:             *
207:             * @return URL of the resource with which this Mark is associated
208:             *
209:             * @exception MalformedURLException if the resource pathname is incorrect
210:             */
211:            public URL getURL() throws MalformedURLException {
212:                return ctxt.getResource(getFile());
213:            }
214:
215:            public String toShortString() {
216:                return "(" + line + "," + col + ")";
217:            }
218:
219:            public boolean equals(Object other) {
220:                if (other instanceof  Mark) {
221:                    Mark m = (Mark) other;
222:                    return this .reader == m.reader && this .fileId == m.fileId
223:                            && this .cursor == m.cursor && this .line == m.line
224:                            && this .col == m.col;
225:                }
226:                return false;
227:            }
228:
229:            /**
230:             * @return true if this Mark is greather than the <code>other</code>
231:             * Mark, false otherwise.
232:             */
233:            public boolean isGreater(Mark other) {
234:
235:                boolean greater = false;
236:
237:                if (this .line > other.line) {
238:                    greater = true;
239:                } else if (this .line == other.line && this .col > other.col) {
240:                    greater = true;
241:                }
242:
243:                return greater;
244:            }
245:
246:            /**
247:             * Keep track of parser before parsing an included file.
248:             * This class keeps track of the parser before we switch to parsing an
249:             * included file. In other words, it's the parser's continuation to be
250:             * reinstalled after the included file parsing is done.
251:             */
252:            class IncludeState {
253:                int cursor, line, col;
254:                int fileId;
255:                String fileName;
256:                String baseDir;
257:                String encoding;
258:                char[] stream = null;
259:
260:                IncludeState(int inCursor, int inLine, int inCol, int inFileId,
261:                        String name, String inBaseDir, String inEncoding,
262:                        char[] inStream) {
263:                    cursor = inCursor;
264:                    line = inLine;
265:                    col = inCol;
266:                    fileId = inFileId;
267:                    fileName = name;
268:                    baseDir = inBaseDir;
269:                    encoding = inEncoding;
270:                    stream = inStream;
271:                }
272:            }
273:
274:        }
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