001    // Copyright 2004, 2005 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.spec;
016    
017    import org.apache.hivemind.Locatable;
018    import org.apache.hivemind.LocationHolder;
019    
020    /**
021     * Stores a binding specification, which identifies the static value or OGNL
022     * expression for the binding. The name of the binding (which matches a bindable
023     * property of the contined component) is implicitly known.
024     * 
025     * @author glongman@intelligentworks.com
026     */
027    public interface IBindingSpecification extends LocationHolder, Locatable
028    {
029    
030        /**
031         * Returns the type of binding specification; this is generally
032         * {@link org.apache.tapestry.spec.BindingType#PREFIXED}.
033         */
034    
035        BindingType getType();
036    
037        /**
038         * For a prefixed binding specification (the typical type), the value is a
039         * binding reference; a string used to contruct the actual binding, and
040         * consists of a prefix (such as "ognl:" or "message:") and a locator. The
041         * prefix selects a {@link org.apache.tapestry.binding.BindingFactory}, and
042         * the locator is passed to the factory, which uses it to construct the
043         * {@link org.apache.tapestry.IBinding}instance.
044         */
045    
046        String getValue();
047    
048        void setType(BindingType type);
049    
050        void setValue(String value);
051    }