Source Code Cross Referenced for CompiledExpression.java in  » Library » Apache-commons-jxpath-1.2-src » org » apache » commons » jxpath » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons jxpath 1.2 src » org.apache.commons.jxpath 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999-2004 The Apache Software Foundation
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:        package org.apache.commons.jxpath;
017:
018:        import java.util.Iterator;
019:
020:        /**
021:         * Represents a compiled XPath. The interpretation of compiled XPaths
022:         * may be faster, because it bypasses the compilation step. The reference
023:         * implementation of JXPathContext also globally caches some of the
024:         * results of compilation, so the direct use of JXPathContext is not
025:         * always less efficient than the use of CompiledExpression.
026:         * <p>
027:         * Use CompiledExpression only when there is a need to evaluate the
028:         * same expression multiple times and the CompiledExpression can be
029:         * conveniently cached.
030:         * <p>
031:         * To acqure a CompiledExpression, call {@link JXPathContext#compile
032:         * JXPathContext.compile}
033:         *
034:         * @author Dmitri Plotnikov
035:         * @version $Revision: 1.6 $ $Date: 2004/02/29 14:17:42 $
036:         */
037:        public interface CompiledExpression {
038:
039:            /**
040:             * Evaluates the xpath and returns the resulting object. Primitive
041:             * types are wrapped into objects.
042:             */
043:            Object getValue(JXPathContext context);
044:
045:            /**
046:             * Evaluates the xpath, converts the result to the specified class and
047:             * returns the resulting object.
048:             */
049:            Object getValue(JXPathContext context, Class requiredType);
050:
051:            /**
052:             * Modifies the value of the property described by the supplied xpath.
053:             * Will throw an exception if one of the following conditions occurs:
054:             * <ul>
055:             * <li>The xpath does not in fact describe an existing property
056:             * <li>The property is not writable (no public, non-static set method)
057:             * </ul>
058:             */
059:            void setValue(JXPathContext context, Object value);
060:
061:            /**
062:             * Creates intermediate elements of
063:             * the path by invoking an AbstractFactory, which should first be
064:             * installed on the context by calling "setFactory".
065:             */
066:            Pointer createPath(JXPathContext context);
067:
068:            /**
069:             * The same as setValue, except it creates intermediate elements of
070:             * the path by invoking an AbstractFactory, which should first be
071:             * installed on the context by calling "setFactory".
072:             * <p>
073:             * Will throw an exception if one of the following conditions occurs:
074:             * <ul>
075:             * <li>Elements of the xpath aleady exist, by the path does not in
076:             *  fact describe an existing property
077:             * <li>The AbstractFactory fails to create an instance for an intermediate
078:             * element.
079:             * <li>The property is not writable (no public, non-static set method)
080:             * </ul>
081:             */
082:            Pointer createPathAndSetValue(JXPathContext context, Object value);
083:
084:            /**
085:             * Traverses the xpath and returns a Iterator of all results found
086:             * for the path. If the xpath matches no properties
087:             * in the graph, the Iterator will not be null.
088:             */
089:            Iterator iterate(JXPathContext context);
090:
091:            /**
092:             * Traverses the xpath and returns a Pointer.
093:             * A Pointer provides easy access to a property.
094:             * If the xpath matches no properties
095:             * in the graph, the pointer will be null.
096:             */
097:            Pointer getPointer(JXPathContext context, String xpath);
098:
099:            /**
100:             * Traverses the xpath and returns an Iterator of Pointers.
101:             * A Pointer provides easy access to a property.
102:             * If the xpath matches no properties
103:             * in the graph, the Iterator be empty, but not null.
104:             */
105:            Iterator iteratePointers(JXPathContext context);
106:
107:            /**
108:             * Remove the graph element described by this expression
109:             */
110:            void removePath(JXPathContext context);
111:
112:            /**
113:             * Remove all graph elements described by this expression
114:             */
115:            void removeAll(JXPathContext context);
116:        }
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