Source Code Cross Referenced for GString.java in  » Scripting » groovy-1.0 » groovy » lang » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » groovy.lang 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: GString.java 4098 2006-10-10 16:09:48Z blackdrag $
003:         * 
004:         * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:         * 
006:         * Redistribution and use of this software and associated documentation
007:         * ("Software"), with or without modification, are permitted provided that the
008:         * following conditions are met: 1. Redistributions of source code must retain
009:         * copyright statements and notices. Redistributions must also contain a copy
010:         * of this document. 2. Redistributions in binary form must reproduce the above
011:         * copyright notice, this list of conditions and the following disclaimer in
012:         * the documentation and/or other materials provided with the distribution. 3.
013:         * The name "groovy" must not be used to endorse or promote products derived
014:         * from this Software without prior written permission of The Codehaus. For
015:         * written permission, please contact info@codehaus.org. 4. Products derived
016:         * from this Software may not be called "groovy" nor may "groovy" appear in
017:         * their names without prior written permission of The Codehaus. "groovy" is a
018:         * registered trademark of The Codehaus. 5. Due credit should be given to The
019:         * Codehaus - http://groovy.codehaus.org/
020:         * 
021:         * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
022:         * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
023:         * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
024:         * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
025:         * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
026:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
027:         * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
028:         * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
029:         * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
030:         * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
031:         * DAMAGE.
032:         *  
033:         */
034:        package groovy.lang;
035:
036:        import java.io.IOException;
037:        import java.io.StringWriter;
038:        import java.io.Writer;
039:        import java.util.ArrayList;
040:        import java.util.Arrays;
041:        import java.util.List;
042:        import java.util.regex.Pattern;
043:
044:        import org.codehaus.groovy.runtime.DefaultGroovyMethods;
045:        import org.codehaus.groovy.runtime.InvokerHelper;
046:
047:        /**
048:         * Represents a String which contains embedded values such as "hello there
049:         * ${user} how are you?" which can be evaluated lazily. Advanced users can
050:         * iterate over the text and values to perform special processing, such as for
051:         * performing SQL operations, the values can be substituted for ? and the
052:         * actual value objects can be bound to a JDBC statement. The lovely name of
053:         * this class was suggested by Jules Gosnell and was such a good idea, I
054:         * couldn't resist :)
055:         * 
056:         * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057:         * @version $Revision: 4098 $
058:         */
059:        public abstract class GString extends GroovyObjectSupport implements 
060:                Comparable, CharSequence, Writable, Buildable {
061:
062:            private Object[] values;
063:
064:            public GString(Object values) {
065:                this .values = (Object[]) values;
066:            }
067:
068:            public GString(Object[] values) {
069:                this .values = values;
070:            }
071:
072:            // will be static in an instance
073:            public abstract String[] getStrings();
074:
075:            /**
076:             * Overloaded to implement duck typing for Strings 
077:             * so that any method that can't be evaluated on this
078:             * object will be forwarded to the toString() object instead.
079:             */
080:            public Object invokeMethod(String name, Object args) {
081:                try {
082:                    return super .invokeMethod(name, args);
083:                } catch (MissingMethodException e) {
084:                    // lets try invoke the method on the real String
085:                    return InvokerHelper.invokeMethod(toString(), name, args);
086:                }
087:            }
088:
089:            public Object[] getValues() {
090:                return values;
091:            }
092:
093:            public GString plus(GString that) {
094:                List stringList = new ArrayList();
095:                List valueList = new ArrayList();
096:
097:                stringList.addAll(Arrays.asList(getStrings()));
098:                valueList.addAll(Arrays.asList(getValues()));
099:
100:                if (stringList.size() > valueList.size()) {
101:                    valueList.add("");
102:                }
103:
104:                stringList.addAll(Arrays.asList(that.getStrings()));
105:                valueList.addAll(Arrays.asList(that.getValues()));
106:
107:                final String[] newStrings = new String[stringList.size()];
108:                stringList.toArray(newStrings);
109:                Object[] newValues = valueList.toArray();
110:
111:                return new GString(newValues) {
112:                    public String[] getStrings() {
113:                        return newStrings;
114:                    }
115:                };
116:            }
117:
118:            public GString plus(String that) {
119:                String[] currentStrings = getStrings();
120:                String[] newStrings = null;
121:                Object[] newValues = null;
122:
123:                newStrings = new String[currentStrings.length + 1];
124:                newValues = new Object[getValues().length + 1];
125:                int lastIndex = currentStrings.length;
126:                System.arraycopy(currentStrings, 0, newStrings, 0, lastIndex);
127:                System.arraycopy(getValues(), 0, newValues, 0,
128:                        getValues().length);
129:                newStrings[lastIndex] = that;
130:                newValues[getValues().length] = "";
131:
132:                final String[] finalStrings = newStrings;
133:                return new GString(newValues) {
134:
135:                    public String[] getStrings() {
136:                        return finalStrings;
137:                    }
138:                };
139:            }
140:
141:            public int getValueCount() {
142:                return values.length;
143:            }
144:
145:            public Object getValue(int idx) {
146:                return values[idx];
147:            }
148:
149:            public String toString() {
150:                StringWriter buffer = new StringWriter();
151:                try {
152:                    writeTo(buffer);
153:                } catch (IOException e) {
154:                    throw new StringWriterIOException(e);
155:                }
156:                return buffer.toString();
157:            }
158:
159:            public Writer writeTo(Writer out) throws IOException {
160:                String[] s = getStrings();
161:                int numberOfValues = values.length;
162:                for (int i = 0, size = s.length; i < size; i++) {
163:                    out.write(s[i]);
164:                    if (i < numberOfValues) {
165:                        InvokerHelper.write(out, values[i]);
166:                    }
167:                }
168:                return out;
169:            }
170:
171:            /* (non-Javadoc)
172:             * @see groovy.lang.Buildable#build(groovy.lang.GroovyObject)
173:             */
174:            public void build(final GroovyObject builder) {
175:                final String[] s = getStrings();
176:                final int numberOfValues = values.length;
177:
178:                for (int i = 0, size = s.length; i < size; i++) {
179:                    builder.getProperty("mkp");
180:                    builder.invokeMethod("yield", new Object[] { s[i] });
181:                    if (i < numberOfValues) {
182:                        builder.getProperty("mkp");
183:                        builder.invokeMethod("yield",
184:                                new Object[] { values[i] });
185:                    }
186:                }
187:            }
188:
189:            public boolean equals(Object that) {
190:                if (that instanceof  GString) {
191:                    return equals((GString) that);
192:                }
193:                return false;
194:            }
195:
196:            public boolean equals(GString that) {
197:                return toString().equals(that.toString());
198:            }
199:
200:            public int hashCode() {
201:                return 37 + toString().hashCode();
202:            }
203:
204:            public int compareTo(Object that) {
205:                return toString().compareTo(that.toString());
206:            }
207:
208:            public char charAt(int index) {
209:                return toString().charAt(index);
210:            }
211:
212:            public int length() {
213:                return toString().length();
214:            }
215:
216:            public CharSequence subSequence(int start, int end) {
217:                return toString().subSequence(start, end);
218:            }
219:
220:            /**
221:             * Turns a String into a regular expression pattern
222:             *
223:             * @return the regular expression pattern
224:             */
225:            public Pattern negate() {
226:                return DefaultGroovyMethods.negate(toString());
227:            }
228:        }
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