Source Code Cross Referenced for StartComponentToken.java in  » Library » Tapestry » org » apache » tapestry » internal » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.internal.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.internal.parser;
016:
017:        import org.apache.tapestry.ioc.Location;
018:
019:        /**
020:         * The start element of a component within the template. Will be followed by a series of
021:         * {@link org.apache.tapestry.internal.parser.AttributeToken}s for any attributes (outside of id
022:         * and type), and eventually will be balanced by an
023:         * {@link org.apache.tapestry.internal.parser.EndElementToken}.
024:         */
025:        public class StartComponentToken extends TemplateToken {
026:            private final String _elementName;
027:
028:            private final String _id;
029:
030:            private final String _componentType;
031:
032:            private final String _mixins;
033:
034:            /**
035:             * @param elementName
036:             *            the name of the element from which this component was parsed, or null if the
037:             *            element was the t:comp placeholder
038:             * @param id
039:             *            the id of the component (may be null for anonymous components)
040:             * @param type
041:             *            the type of component (may be null if the component type is specified outside the
042:             *            template)
043:             * @param mixins
044:             *            a comma-separated list of mixins (possibly null)
045:             * @param location
046:             *            the location within the template at which the element was parsed
047:             */
048:            public StartComponentToken(String elementName, String id,
049:                    String type, String mixins, Location location) {
050:                super (TokenType.START_COMPONENT, location);
051:
052:                // TODO: id or type may be null, but not both!
053:
054:                _elementName = elementName;
055:                _id = id;
056:                _componentType = type;
057:                _mixins = mixins;
058:            }
059:
060:            /**
061:             * Returns the element for this component. When using the <t:comp> placeholder, this value
062:             * will be null. When using "invisible instrumentation", where t:id or t:type attributes are
063:             * added to existing elements, this is the local name of the element so attached.
064:             * 
065:             * @return the element name or null
066:             */
067:            public String getElementName() {
068:                return _elementName;
069:            }
070:
071:            /**
072:             * Returns a non-blank id if one was provided in the template. If the id attribute was missing
073:             * (or the value was blank), returns null.
074:             */
075:            public String getId() {
076:                return _id;
077:            }
078:
079:            /**
080:             * Returns a non-blank component type if one was provided in the template. If the type attribute
081:             * was missing (or the value was blank), returns null.
082:             */
083:            public String getComponentType() {
084:                return _componentType;
085:            }
086:
087:            @Override
088:            public String toString() {
089:                StringBuilder builder = new StringBuilder();
090:
091:                add(builder, "element", _elementName);
092:                add(builder, "id", _id);
093:                add(builder, "type", _componentType);
094:                add(builder, "mixins", _mixins);
095:
096:                builder.insert(0, "StartComponentToken[");
097:                builder.append("]");
098:
099:                return builder.toString();
100:            }
101:
102:            private void add(StringBuilder builder, String label, String value) {
103:                if (value == null)
104:                    return;
105:
106:                if (builder.length() > 0)
107:                    builder.append(" ");
108:
109:                builder.append(label);
110:                builder.append("=");
111:                builder.append(value);
112:            }
113:
114:            /**
115:             * Returns the list of mixins for this component instance, or null for no mixins.
116:             */
117:            public String getMixins() {
118:                return _mixins;
119:            }
120:
121:        }
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