Source Code Cross Referenced for Parameter.java in  » Workflow-Engines » spring-webflow-1.0.4 » org » springframework » binding » method » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » spring webflow 1.0.4 » org.springframework.binding.method 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2007 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:        package org.springframework.binding.method;
017:
018:        import org.springframework.binding.expression.EvaluationContext;
019:        import org.springframework.binding.expression.Expression;
020:        import org.springframework.core.style.ToStringCreator;
021:        import org.springframework.util.Assert;
022:        import org.springframework.util.ObjectUtils;
023:
024:        /**
025:         * A named method parameter. Each parameter has an identifying name and is of a
026:         * specified type (class).
027:         * 
028:         * @author Keith Donald
029:         */
030:        public class Parameter {
031:
032:            /**
033:             * The class of the parameter, e.g "springbank.AccountNumber".
034:             */
035:            private Class type;
036:
037:            /**
038:             * The name of the parameter as an evaluatable expression, e.g
039:             * "accountNumber".
040:             */
041:            private Expression name;
042:
043:            /**
044:             * Create a new named parameter definition.  Named parameters are capable of resolving 
045:             * parameter values (arguments) from argument sources.
046:             * @param type the parameter type, may be null
047:             * @param name the name the method argument expression (required)
048:             */
049:            public Parameter(Class type, Expression name) {
050:                Assert.notNull(name,
051:                        "The parameter name expression is required");
052:                this .type = type;
053:                this .name = name;
054:            }
055:
056:            /**
057:             * Returns the parameter type. Could be null if no parameter type
058:             * was specified.
059:             */
060:            public Class getType() {
061:                return type;
062:            }
063:
064:            /**
065:             * Returns the parameter name.
066:             */
067:            public Expression getName() {
068:                return name;
069:            }
070:
071:            /**
072:             * Evaluate this method parameter against the provided argument source,
073:             * returning a single method argument value.
074:             * @param argumentSource the meyhod argument source
075:             * @param context the evaluation context
076:             * @return the method argument value
077:             */
078:            public Object evaluateArgument(Object argumentSource,
079:                    EvaluationContext context) {
080:                return name.evaluate(argumentSource, context);
081:            }
082:
083:            public boolean equals(Object obj) {
084:                if (!(obj instanceof  Parameter)) {
085:                    return false;
086:                }
087:                Parameter other = (Parameter) obj;
088:                return ObjectUtils.nullSafeEquals(type, other.type)
089:                        && name.equals(other.name);
090:            }
091:
092:            public int hashCode() {
093:                return (type != null ? type.hashCode() : 0) + name.hashCode();
094:            }
095:
096:            public String toString() {
097:                return new ToStringCreator(this ).append("type", type).append(
098:                        "name", name).toString();
099:            }
100:        }
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