Source Code Cross Referenced for VelocityLayoutViewResolver.java in  » J2EE » spring-framework-2.0.6 » org » springframework » web » servlet » view » velocity » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.web.servlet.view.velocity 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.web.servlet.view.velocity;
018:
019:        import org.springframework.web.servlet.view.AbstractUrlBasedView;
020:
021:        /**
022:         * Convenience subclass of VelocityViewResolver, adding support
023:         * for VelocityLayoutView and its properties.
024:         *
025:         * <p>See VelocityViewResolver's javadoc for general usage info.
026:         *
027:         * @author Juergen Hoeller
028:         * @since 1.2.7
029:         * @see VelocityViewResolver
030:         * @see VelocityLayoutView
031:         * @see #setLayoutUrl
032:         * @see #setLayoutKey
033:         * @see #setScreenContentKey
034:         */
035:        public class VelocityLayoutViewResolver extends VelocityViewResolver {
036:
037:            private String layoutUrl;
038:
039:            private String layoutKey;
040:
041:            private String screenContentKey;
042:
043:            /**
044:             * Requires VelocityLayoutView.
045:             * @see VelocityLayoutView
046:             */
047:            protected Class requiredViewClass() {
048:                return VelocityLayoutView.class;
049:            }
050:
051:            /**
052:             * Set the layout template to use. Default is "layout.vm".
053:             * @param layoutUrl the template location (relative to the template
054:             * root directory)
055:             * @see VelocityLayoutView#setLayoutUrl
056:             */
057:            public void setLayoutUrl(String layoutUrl) {
058:                this .layoutUrl = layoutUrl;
059:            }
060:
061:            /**
062:             * Set the context key used to specify an alternate layout to be used instead
063:             * of the default layout. Screen content templates can override the layout
064:             * template that they wish to be wrapped with by setting this value in the
065:             * template, for example:<br>
066:             * <code>#set( $layout = "MyLayout.vm" )</code>
067:             * <p>The default key is "layout", as illustrated above.
068:             * @param layoutKey the name of the key you wish to use in your
069:             * screen content templates to override the layout template
070:             * @see VelocityLayoutView#setLayoutKey
071:             */
072:            public void setLayoutKey(String layoutKey) {
073:                this .layoutKey = layoutKey;
074:            }
075:
076:            /**
077:             * Set the name of the context key that will hold the content of
078:             * the screen within the layout template. This key must be present
079:             * in the layout template for the current screen to be rendered.
080:             * <p>Default is "screen_content": accessed in VTL as
081:             * <code>$screen_content</code>.
082:             * @param screenContentKey the name of the screen content key to use
083:             * @see VelocityLayoutView#setScreenContentKey
084:             */
085:            public void setScreenContentKey(String screenContentKey) {
086:                this .screenContentKey = screenContentKey;
087:            }
088:
089:            protected AbstractUrlBasedView buildView(String viewName)
090:                    throws Exception {
091:                VelocityLayoutView view = (VelocityLayoutView) super 
092:                        .buildView(viewName);
093:                // Use not-null checks to preserve VelocityLayoutView's defaults.
094:                if (this.layoutUrl != null) {
095:                    view.setLayoutUrl(this.layoutUrl);
096:                }
097:                if (this.layoutKey != null) {
098:                    view.setLayoutKey(this.layoutKey);
099:                }
100:                if (this.screenContentKey != null) {
101:                    view.setScreenContentKey(this.screenContentKey);
102:                }
103:                return view;
104:            }
105:
106:        }
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