Source Code Cross Referenced for ArgEntry.java in  » Workflow-Engines » pegasus-2.1.0 » org » griphyn » vdl » invocation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » pegasus 2.1.0 » org.griphyn.vdl.invocation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file or a portion of this file is licensed under the terms of
003:         * the Globus Toolkit Public License, found in file GTPL, or at
004:         * http://www.globus.org/toolkit/download/license.html. This notice must
005:         * appear in redistributions of this file, with or without modification.
006:         *
007:         * Redistributions of this Software, with or without modification, must
008:         * reproduce the GTPL in: (1) the Software, or (2) the Documentation or
009:         * some other similar material which is provided with the Software (if
010:         * any).
011:         *
012:         * Copyright 1999-2004 University of Chicago and The University of
013:         * Southern California. All rights reserved.
014:         */
015:        package org.griphyn.vdl.invocation;
016:
017:        import java.util.*;
018:        import java.io.Writer;
019:        import java.io.IOException;
020:
021:        /**
022:         * This class carries an argument vector entry for the argument vector.
023:         * This calls is expected to be transient to the parsing process only.
024:         *
025:         * @author Jens-S. Vöckler
026:         * @author Yong Zhao
027:         * @version $Revision: 50 $
028:         */
029:        public class ArgEntry extends Invocation implements  HasText {
030:            /**
031:             * argument vector position
032:             */
033:            private int m_position;
034:
035:            /**
036:             * argument vector value
037:             */
038:            private StringBuffer m_value;
039:
040:            /**
041:             * Default c'tor: Construct a hollow shell and allow further
042:             * information to be added later.
043:             */
044:            public ArgEntry() {
045:                m_position = -1;
046:                m_value = null;
047:            }
048:
049:            /**
050:             * C'tor: Prepares a given key for accepting a value later on.
051:             * @param position is the location to use.
052:             */
053:            public ArgEntry(int position) {
054:                m_position = position;
055:                m_value = null;
056:            }
057:
058:            /**
059:             * C'tor: Fully initializes the class
060:             * @param position is the location to use.
061:             * @param value is the value to remember
062:             */
063:            public ArgEntry(int position, String value) {
064:                m_position = position;
065:                m_value = new StringBuffer(value);
066:            }
067:
068:            /**
069:             * Appends a piece of text to the existing text. 
070:             * @param fragment is a piece of text to append to existing text.
071:             * Appending <code>null</code> is a noop.
072:             */
073:            public void appendValue(String fragment) {
074:                if (fragment != null) {
075:                    if (this .m_value == null)
076:                        this .m_value = new StringBuffer(fragment);
077:                    else
078:                        this .m_value.append(fragment);
079:                }
080:            }
081:
082:            /**
083:             * Accessor
084:             * @return the position of this entry in the argument vector. 
085:             * @see #setPosition(int)
086:             */
087:            public int getPosition() {
088:                return this .m_position;
089:            }
090:
091:            /**
092:             * Accessor.
093:             *
094:             * @param position
095:             * @see #getPosition()
096:             */
097:            public void setPosition(int position) {
098:                this .m_position = position;
099:            }
100:
101:            /**
102:             * Accessor
103:             *
104:             * @see #setValue(String)
105:             */
106:            public String getValue() {
107:                return (m_value == null ? null : m_value.toString());
108:            }
109:
110:            /**
111:             * Accessor.
112:             *
113:             * @param value is the new value to set.
114:             * @see #getValue()
115:             */
116:            public void setValue(String value) {
117:                this .m_value = (value == null ? null : new StringBuffer(value));
118:            }
119:
120:            /**
121:             * Converts the active state into something meant for human consumption.
122:             * The method will be called when recursively traversing the instance
123:             * tree. 
124:             *
125:             * @param stream is a stream opened and ready for writing. This can also
126:             * be a string stream for efficient output.
127:             */
128:            public void toString(Writer stream) throws IOException {
129:                stream.write('[');
130:                stream.write(m_position);
131:                stream.write("]=");
132:                stream.write(getValue());
133:            }
134:
135:            /**
136:             * Dumps the state of the current element as XML output. However, for
137:             * the given instance, this class is ludicrious.
138:             *
139:             * @param stream is a stream opened and ready for writing. This can also
140:             * be a string stream for efficient output.
141:             * @param indent is a <code>String</code> of spaces used for pretty
142:             * printing. The initial amount of spaces should be an empty string.
143:             * The parameter is used internally for the recursive traversal.
144:             * @param namespace is the XML schema namespace prefix. If neither
145:             * empty nor null, each element will be prefixed with this prefix,
146:             * and the root element will map the XML namespace. 
147:             * @exception IOException if something fishy happens to the stream.
148:             */
149:            public void toXML(Writer stream, String indent, String namespace)
150:                    throws IOException {
151:                String tag = (namespace != null && namespace.length() > 0) ? namespace
152:                        + ":arg"
153:                        : "arg";
154:
155:                // open tag
156:                if (indent != null && indent.length() > 0)
157:                    stream.write(indent);
158:                stream.write('<');
159:                stream.write(tag);
160:                writeAttribute(stream, " id=\"", Integer.toString(m_position));
161:                stream.write('>');
162:
163:                stream.write(quote(getValue(), false));
164:
165:                stream.write("</");
166:                stream.write(tag);
167:                stream.write('>');
168:                if (indent != null)
169:                    stream.write(System.getProperty("line.separator", "\r\n"));
170:            }
171:        }
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