Initial import of GenericBinder.

org.springframework.context/src/main/java/org/springframework/model/binder/support/GenericBinder.java

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+/*
+ * Copyright 2004-2009 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.model.binder.support;
+
+import java.util.Map;
+
+import org.springframework.expression.EvaluationContext;
+import org.springframework.expression.EvaluationException;
+import org.springframework.expression.Expression;
+import org.springframework.expression.ExpressionParser;
+import org.springframework.expression.ParseException;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
+import org.springframework.expression.spel.standard.SpelExpressionParserConfiguration;
+import org.springframework.expression.spel.support.StandardEvaluationContext;
+import org.springframework.model.alert.Alert;
+import org.springframework.model.alert.Severity;
+import org.springframework.model.binder.Binder;
+import org.springframework.model.binder.BindingResult;
+import org.springframework.model.binder.BindingResults;
+
+/**
+ * A {@link Binder} implementation that accepts any target object and uses
+ * Spring's Expression Language support to evaluate the keys in the field
+ * value Map.
+ * 
+ * @author Mark Fisher
+ * @since 3.0
+ */
+public class GenericBinder extends AbstractBinder<Object> {
+
+	private final ExpressionParser parser = new SpelExpressionParser(
+			SpelExpressionParserConfiguration.CreateObjectIfAttemptToReferenceNull |
+			SpelExpressionParserConfiguration.GrowListsOnIndexBeyondSize); 
+
+
+	@Override
+	public BindingResults bind(Map<String, ? extends Object> fieldValues, Object model) {
+		StandardEvaluationContext evaluationContext = new StandardEvaluationContext();
+		evaluationContext.setRootObject(model);
+		FieldBinder fieldBinder = new EvaluationContextFieldBinder(this.parser, evaluationContext);
+		return this.getBindTemplate().bind(fieldValues, fieldBinder);
+	}
+
+
+	private static class EvaluationContextFieldBinder implements FieldBinder {
+
+		private final ExpressionParser parser;
+
+		private final EvaluationContext context;
+
+		private EvaluationContextFieldBinder(ExpressionParser parser, EvaluationContext context) {
+			this.parser = parser;
+			this.context = context;
+		}
+
+		@Override
+		public BindingResult bind(String key, Object value) {
+			Alert alert = null;
+			try {
+				Expression e = this.parser.parseExpression(key);
+				e.setValue(this.context, value);
+				alert = new BindSuccessAlert();
+			}
+			catch (ParseException e) {
+				alert = new ParseFailureAlert(e);
+			}
+			catch (EvaluationException e) {
+				alert = new EvaluationFailureAlert(e);
+			}
+			return new AlertBindingResult(key, value, alert);
+		}
+	}
+
+
+	private static class BindSuccessAlert implements Alert {
+
+		public String getCode() {
+			return "bindSuccess";
+		}
+
+		public String getMessage() {
+			return "Binding successful";
+		}
+
+		public Severity getSeverity() {
+			return Severity.INFO;
+		}
+	}
+
+
+	private static class ParseFailureAlert implements Alert {
+
+		private final ParseException exception;
+
+		ParseFailureAlert(ParseException exception) {
+			this.exception = exception;
+		}
+
+		public String getCode() {
+			return "parserFailed";
+		}
+
+		public String getMessage() {
+			return exception.getMessage();
+		}
+
+		public Severity getSeverity() {
+			return Severity.ERROR;
+		}
+	}
+
+
+	private static class EvaluationFailureAlert implements Alert {
+
+		private final EvaluationException exception;
+
+		EvaluationFailureAlert(EvaluationException exception) {
+			this.exception = exception;
+		}
+
+		public String getCode() {
+			return "evaluationFailed";
+		}
+
+		public String getMessage() {
+			return exception.getMessage();
+		}
+
+		public Severity getSeverity() {
+			return Severity.ERROR;
+		}
+	}
+
+}

org.springframework.context/src/test/java/org/springframework/model/binder/support/GenericBinderTests.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright 2004-2009 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.model.binder.support;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Test;
+
+import org.springframework.core.style.ToStringCreator;
+import org.springframework.model.binder.Binder;
+
+/**
+ * @author Mark Fisher
+ * @since 3.0
+ */
+public class GenericBinderTests {
+
+	@Test
+	public void simpleValues() {
+		Person person = new Person();
+		Map<String, Object> map = new HashMap<String, Object>();
+		map.put("name", "John Doe");
+		map.put("age", 42);
+		map.put("male", true);
+		Binder <Object> binder = new GenericBinder();
+		binder.bind(map, person);
+		assertEquals("John Doe", person.name);
+		assertEquals(42, person.age);
+		assertTrue(person.male);
+	}
+
+	@Test
+	public void nestedValues() {
+		Person person = new Person();
+		Map<String, Object> map = new HashMap<String, Object>();
+		map.put("pob.city", "Rome");
+		map.put("pob.country", "Italy");
+		Binder<Object> binder = new GenericBinder();
+		binder.bind(map, person);
+		assertNotNull(person.pob);
+		assertEquals("Rome", person.pob.city);
+		assertEquals("Italy", person.pob.country);
+	}
+
+
+	public static class Person {
+
+		private String name;
+
+		private int age;
+
+		private boolean male;
+
+		private PlaceOfBirth pob;
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public int getAge() {
+			return age;
+		}
+
+		public void setAge(int age) {
+			this.age = age;
+		}
+
+		public boolean isMale() {
+			return male;
+		}
+
+		public void setMale(boolean male) {
+			this.male = male;
+		}
+
+		public PlaceOfBirth getPob() {
+			return pob;
+		}
+
+		public void setPob(PlaceOfBirth pob) {
+			this.pob = pob;
+		}
+
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("name", name)
+					.append("age", age)
+					.append("male", male)
+					.append("pob", pob)
+					.toString();
+		}
+	}
+
+
+	public static class PlaceOfBirth {
+
+		private String city;
+
+		private String country;
+
+		public String getCity() {
+			return city;
+		}
+
+		public void setCity(String city) {
+			this.city = city;
+		}
+
+		public String getCountry() {
+			return country;
+		}
+
+		public void setCountry(String country) {
+			this.country = country;
+		}
+
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("city", city)
+					.append("country", country)
+					.toString();
+		}
+	}
+
+}