Source Code Cross Referenced for ExpressionContextImpl.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » woody » formmodel » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.woody.formmodel 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.woody.formmodel;
018:
019:        import org.outerj.expression.ExpressionContext;
020:
021:        import java.math.BigDecimal;
022:
023:        /**
024:         * Implementation of the ExpressionContext required for the evaluation of
025:         * expressions by xReporter expression interpreter.
026:         * 
027:         * @version $Id: ExpressionContextImpl.java 433543 2006-08-22 06:22:54Z crossley $
028:         */
029:        public class ExpressionContextImpl implements  ExpressionContext {
030:            private Widget widget;
031:            private boolean referenceChildren;
032:
033:            public ExpressionContextImpl(Widget widget) {
034:                this .widget = widget;
035:                this .referenceChildren = false;
036:            }
037:
038:            /**
039:             * @param referenceChildren if true, variables will be resolved among the children of the given
040:             * container widget, rather than among the siblings of the widget.
041:             */
042:            public ExpressionContextImpl(Widget widget,
043:                    boolean referenceChildren) {
044:                this .widget = widget;
045:                this .referenceChildren = referenceChildren;
046:            }
047:
048:            /**
049:             * Variables refer to other widgets.
050:             *
051:             * <p>The current implementation only allows access to sibling widgets.
052:             *
053:             * <p>In case the value of a widget is null but the widget is required, then a special
054:             * exception will be thrown, the {@link CannotYetResolveWarning}. This is because in
055:             * that case, you'll probably want to re-evaluate the expression at a later time (since
056:             * the widget is required, it will eventually get a value).
057:             *
058:             * <p>In case the value of the widget is null but the field is not required, then simply
059:             * null is returned. (TODO: a function IsNull() will provided in the expression library
060:             * so that expression writers can check for the likely condition where a non-required field
061:             * is null).
062:             *
063:             * <p>If the variable name does not refer to an existing widget, null is returned (TODO: this
064:             * behaviour will probably change in the future)
065:             */
066:            public Object resolveVariable(String name) {
067:                // TODO allow to access other widgets instead of only siblings (allow going up with ../ notation or something)
068:                Widget widget;
069:                if (!referenceChildren)
070:                    widget = this .widget.getParent().getWidget(name);
071:                else
072:                    widget = this .widget.getWidget(name);
073:                if (widget != null) {
074:                    Object value = widget.getValue();
075:
076:                    if (value == null && widget.isRequired()) {
077:                        // the widget currently has not yet a value, but since it is required, it will get a value sooner
078:                        // or later. Therefore, we throw an exception here indicating that this expression can currenlty
079:                        // not yet be evaluated, but will be at a later time.
080:                        throw new CannotYetResolveWarning();
081:                    }
082:
083:                    // do some type conversions:
084:                    //   * the expression library only knows about BigDecimals as being numbers, so convert Longs first to BigDecimals
085:                    //   * ...
086:                    if (value instanceof  Long)
087:                        return new BigDecimal(((Long) value).longValue());
088:                    else if (value instanceof  Integer)
089:                        return new BigDecimal(((Integer) value).intValue());
090:                    else
091:                        return value;
092:                }
093:                return null;
094:            }
095:
096:            public Object get(String s) {
097:                return null;
098:            }
099:
100:        }
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