ReaderEditor supports Reader injection analogous to InputStreamEditor (from Spring resource location)

Also, EncodedResource implements InputStreamSource now since it declares getInputStream() anyway.

Issue: SPR-12876

spring-beans/src/main/java/org/springframework/beans/PropertyEditorRegistrySupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -19,6 +19,7 @@ package org.springframework.beans;
 import java.beans.PropertyEditor;
 import java.io.File;
 import java.io.InputStream;
+import java.io.Reader;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.URI;
@@ -60,6 +61,7 @@ import org.springframework.beans.propertyeditors.InputStreamEditor;
 import org.springframework.beans.propertyeditors.LocaleEditor;
 import org.springframework.beans.propertyeditors.PatternEditor;
 import org.springframework.beans.propertyeditors.PropertiesEditor;
+import org.springframework.beans.propertyeditors.ReaderEditor;
 import org.springframework.beans.propertyeditors.StringArrayPropertyEditor;
 import org.springframework.beans.propertyeditors.TimeZoneEditor;
 import org.springframework.beans.propertyeditors.URIEditor;
@@ -211,6 +213,7 @@ public class PropertyEditorRegistrySupport implements PropertyEditorRegistry {
 		this.defaultEditors.put(Locale.class, new LocaleEditor());
 		this.defaultEditors.put(Pattern.class, new PatternEditor());
 		this.defaultEditors.put(Properties.class, new PropertiesEditor());
+		this.defaultEditors.put(Reader.class, new ReaderEditor());
 		this.defaultEditors.put(Resource[].class, new ResourceArrayPropertyEditor());
 		this.defaultEditors.put(TimeZone.class, new TimeZoneEditor());
 		this.defaultEditors.put(URI.class, new URIEditor());

spring-beans/src/main/java/org/springframework/beans/propertyeditors/InputStreamEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -25,13 +25,13 @@ import org.springframework.util.Assert;
 
 /**
  * One-way PropertyEditor which can convert from a text String to a
- * {@code java.io.InputStream}, interpreting the given String
- * as Spring resource location (e.g. a URL String).
+ * {@code java.io.InputStream}, interpreting the given String as a
+ * Spring resource location (e.g. a URL String).
  *
  * <p>Supports Spring-style URL notation: any fully qualified standard URL
  * ("file:", "http:", etc) and Spring's special "classpath:" pseudo-URL.
  *
- * <p>Note that in the default usage, the stream is not closed by Spring itself!
+ * <p>Note that such streams do usually not get closed by Spring itself!
  *
  * @author Juergen Hoeller
  * @since 1.0.1
@@ -73,8 +73,7 @@ public class InputStreamEditor extends PropertyEditorSupport {
 			setValue(resource != null ? resource.getInputStream() : null);
 		}
 		catch (IOException ex) {
-			throw new IllegalArgumentException(
-					"Could not retrieve InputStream for " + resource + ": " + ex.getMessage());
+			throw new IllegalArgumentException("Failed to retrieve InputStream for " + resource, ex);
 		}
 	}
 

spring-beans/src/main/java/org/springframework/beans/propertyeditors/ReaderEditor.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2002-2015 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.beans.propertyeditors;
+
+import java.beans.PropertyEditorSupport;
+import java.io.IOException;
+
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceEditor;
+import org.springframework.core.io.support.EncodedResource;
+import org.springframework.util.Assert;
+
+/**
+ * One-way PropertyEditor which can convert from a text String to a
+ * {@code java.io.Reader}, interpreting the given String as a Spring
+ * resource location (e.g. a URL String).
+ *
+ * <p>Supports Spring-style URL notation: any fully qualified standard URL
+ * ("file:", "http:", etc) and Spring's special "classpath:" pseudo-URL.
+ *
+ * <p>Note that such readers do usually not get closed by Spring itself!
+ *
+ * @author Juergen Hoeller
+ * @since 4.2
+ * @see java.io.Reader
+ * @see org.springframework.core.io.ResourceEditor
+ * @see org.springframework.core.io.ResourceLoader
+ * @see InputStreamEditor
+ */
+public class ReaderEditor extends PropertyEditorSupport {
+
+	private final ResourceEditor resourceEditor;
+
+
+	/**
+	 * Create a new ReaderEditor,
+	 * using the default ResourceEditor underneath.
+	 */
+	public ReaderEditor() {
+		this.resourceEditor = new ResourceEditor();
+	}
+
+	/**
+	 * Create a new ReaderEditor,
+	 * using the given ResourceEditor underneath.
+	 * @param resourceEditor the ResourceEditor to use
+	 */
+	public ReaderEditor(ResourceEditor resourceEditor) {
+		Assert.notNull(resourceEditor, "ResourceEditor must not be null");
+		this.resourceEditor = resourceEditor;
+	}
+
+
+	@Override
+	public void setAsText(String text) throws IllegalArgumentException {
+		this.resourceEditor.setAsText(text);
+		Resource resource = (Resource) this.resourceEditor.getValue();
+		try {
+			setValue(resource != null ? new EncodedResource(resource).getReader() : null);
+		}
+		catch (IOException ex) {
+			throw new IllegalArgumentException("Failed to retrieve Reader for " + resource, ex);
+		}
+	}
+
+	/**
+	 * This implementation returns {@code null} to indicate that
+	 * there is no appropriate text representation.
+	 */
+	@Override
+	public String getAsText() {
+		return null;
+	}
+
+}

spring-beans/src/main/java/org/springframework/beans/support/ResourceEditorRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -19,6 +19,7 @@ package org.springframework.beans.support;
 import java.beans.PropertyEditor;
 import java.io.File;
 import java.io.InputStream;
+import java.io.Reader;
 import java.net.URI;
 import java.net.URL;
 
@@ -32,10 +33,10 @@ import org.springframework.beans.propertyeditors.ClassEditor;
 import org.springframework.beans.propertyeditors.FileEditor;
 import org.springframework.beans.propertyeditors.InputSourceEditor;
 import org.springframework.beans.propertyeditors.InputStreamEditor;
+import org.springframework.beans.propertyeditors.ReaderEditor;
 import org.springframework.beans.propertyeditors.URIEditor;
 import org.springframework.beans.propertyeditors.URLEditor;
 import org.springframework.core.env.PropertyResolver;
-import org.springframework.core.env.StandardEnvironment;
 import org.springframework.core.io.ContextResource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceEditor;
@@ -102,6 +103,7 @@ public class ResourceEditorRegistrar implements PropertyEditorRegistrar {
 		doRegisterEditor(registry, InputStream.class, new InputStreamEditor(baseEditor));
 		doRegisterEditor(registry, InputSource.class, new InputSourceEditor(baseEditor));
 		doRegisterEditor(registry, File.class, new FileEditor(baseEditor));
+		doRegisterEditor(registry, Reader.class, new ReaderEditor(baseEditor));
 		doRegisterEditor(registry, URL.class, new URLEditor(baseEditor));
 
 		ClassLoader classLoader = this.resourceLoader.getClassLoader();

spring-beans/src/test/java/org/springframework/beans/propertyeditors/InputStreamEditorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2006 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -30,9 +30,9 @@ import static org.junit.Assert.*;
  * @author Rick Evans
  * @author Chris Beams
  */
-public final class InputStreamEditorTests {
+public class InputStreamEditorTests {
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void testCtorWithNullResourceEditor() throws Exception {
 		new InputStreamEditor(null);
 	}
@@ -41,7 +41,8 @@ public final class InputStreamEditorTests {
 	public void testSunnyDay() throws Exception {
 		InputStream stream = null;
 		try {
-			String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) + "/" + ClassUtils.getShortName(getClass()) + ".class";
+			String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) +
+					"/" + ClassUtils.getShortName(getClass()) + ".class";
 			InputStreamEditor editor = new InputStreamEditor();
 			editor.setAsText(resource);
 			Object value = editor.getValue();
@@ -49,14 +50,15 @@ public final class InputStreamEditorTests {
 			assertTrue(value instanceof InputStream);
 			stream = (InputStream) value;
 			assertTrue(stream.available() > 0);
-		} finally {
+		}
+		finally {
 			if (stream != null) {
 				stream.close();
 			}
 		}
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void testWhenResourceDoesNotExist() throws Exception {
 		String resource = "classpath:bingo!";
 		InputStreamEditor editor = new InputStreamEditor();
@@ -66,7 +68,8 @@ public final class InputStreamEditorTests {
 	@Test
 	public void testGetAsTextReturnsNullByDefault() throws Exception {
 		assertNull(new InputStreamEditor().getAsText());
-		String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) + "/" + ClassUtils.getShortName(getClass()) + ".class";
+		String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) +
+				"/" + ClassUtils.getShortName(getClass()) + ".class";
 		InputStreamEditor editor = new InputStreamEditor();
 		editor.setAsText(resource);
 		assertNull(editor.getAsText());

spring-beans/src/test/java/org/springframework/beans/propertyeditors/ReaderEditorTests.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2002-2015 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.beans.propertyeditors;
+
+import java.io.Reader;
+
+import org.junit.Test;
+
+import org.springframework.util.ClassUtils;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for the {@link ReaderEditor} class.
+ *
+ * @author Juergen Hoeller
+ * @since 4.2
+ */
+public class ReaderEditorTests {
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testCtorWithNullResourceEditor() throws Exception {
+		new InputStreamEditor(null);
+	}
+
+	@Test
+	public void testSunnyDay() throws Exception {
+		Reader reader = null;
+		try {
+			String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) +
+					"/" + ClassUtils.getShortName(getClass()) + ".class";
+			ReaderEditor editor = new ReaderEditor();
+			editor.setAsText(resource);
+			Object value = editor.getValue();
+			assertNotNull(value);
+			assertTrue(value instanceof Reader);
+			reader = (Reader) value;
+			assertTrue(reader.ready());
+		}
+		finally {
+			if (reader != null) {
+				reader.close();
+			}
+		}
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testWhenResourceDoesNotExist() throws Exception {
+		String resource = "classpath:bingo!";
+		ReaderEditor editor = new ReaderEditor();
+		editor.setAsText(resource);
+	}
+
+	@Test
+	public void testGetAsTextReturnsNullByDefault() throws Exception {
+		assertNull(new ReaderEditor().getAsText());
+		String resource = "classpath:" + ClassUtils.classPackageAsResourcePath(getClass()) +
+				"/" + ClassUtils.getShortName(getClass()) + ".class";
+		ReaderEditor editor = new ReaderEditor();
+		editor.setAsText(resource);
+		assertNull(editor.getAsText());
+	}
+
+}

spring-context/src/test/java/org/springframework/context/expression/ApplicationContextExpressionTests.java

@@ -16,7 +16,13 @@
 
 package org.springframework.context.expression;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
 import java.io.Serializable;
+import java.net.URI;
+import java.net.URL;
 import java.security.AccessControlException;
 import java.security.Permission;
 import java.util.Properties;
@@ -36,13 +42,18 @@ import org.springframework.beans.factory.support.AutowireCandidateQualifier;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.GenericBeanDefinition;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigUtils;
 import org.springframework.context.support.GenericApplicationContext;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.support.GenericConversionService;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.EncodedResource;
 import org.springframework.tests.Assume;
 import org.springframework.tests.TestGroup;
 import org.springframework.tests.sample.beans.TestBean;
+import org.springframework.util.FileCopyUtils;
 import org.springframework.util.SerializationTestUtils;
 import org.springframework.util.StopWatch;
 
@@ -56,6 +67,7 @@ public class ApplicationContextExpressionTests {
 
 	private static final Log factoryLog = LogFactory.getLog(DefaultListableBeanFactory.class);
 
+
 	@Test
 	public void genericApplicationContext() throws Exception {
 		GenericApplicationContext ac = new GenericApplicationContext();
@@ -312,6 +324,27 @@ public class ApplicationContextExpressionTests {
 		assertTrue(str.startsWith("test-"));
 	}
 
+	@Test
+	public void resourceInjection() throws IOException {
+		System.setProperty("logfile", "log4j.properties");
+		try {
+			AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(ResourceInjectionBean.class);
+			ResourceInjectionBean resourceInjectionBean = ac.getBean(ResourceInjectionBean.class);
+			Resource resource = new ClassPathResource("log4j.properties");
+			assertEquals(resource, resourceInjectionBean.resource);
+			assertEquals(resource.getURL(), resourceInjectionBean.url);
+			assertEquals(resource.getURI(), resourceInjectionBean.uri);
+			assertEquals(resource.getFile(), resourceInjectionBean.file);
+			assertArrayEquals(FileCopyUtils.copyToByteArray(resource.getInputStream()),
+					FileCopyUtils.copyToByteArray(resourceInjectionBean.inputStream));
+			assertEquals(FileCopyUtils.copyToString(new EncodedResource(resource).getReader()),
+					FileCopyUtils.copyToString(resourceInjectionBean.reader));
+		}
+		finally {
+			System.getProperties().remove("logfile");
+		}
+	}
+
 
 	@SuppressWarnings("serial")
 	public static class ValueTestBean implements Serializable {
@@ -450,4 +483,26 @@ public class ApplicationContextExpressionTests {
 		}
 	}
 
+
+	public static class ResourceInjectionBean {
+
+		@Value("classpath:#{systemProperties.logfile}")
+		Resource resource;
+
+		@Value("classpath:#{systemProperties.logfile}")
+		URL url;
+
+		@Value("classpath:#{systemProperties.logfile}")
+		URI uri;
+
+		@Value("classpath:#{systemProperties.logfile}")
+		File file;
+
+		@Value("classpath:#{systemProperties.logfile}")
+		InputStream inputStream;
+
+		@Value("classpath:#{systemProperties.logfile}")
+		Reader reader;
+	}
+
 }

spring-core/src/main/java/org/springframework/core/io/support/EncodedResource.java

@@ -22,6 +22,7 @@ import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.Charset;
 
+import org.springframework.core.io.InputStreamSource;
 import org.springframework.core.io.Resource;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
@@ -39,7 +40,7 @@ import org.springframework.util.ObjectUtils;
  * @see java.io.Reader
  * @see java.nio.charset.Charset
  */
-public class EncodedResource {
+public class EncodedResource implements InputStreamSource {
 
 	private final Resource resource;
 
@@ -85,6 +86,7 @@ public class EncodedResource {
 		this.charset = charset;
 	}
 
+
 	/**
 	 * Return the {@code Resource} held by this {@code EncodedResource}.
 	 */
@@ -146,6 +148,7 @@ public class EncodedResource {
 	 * @see #requiresReader()
 	 * @see #getReader()
 	 */
+	@Override
 	public InputStream getInputStream() throws IOException {
 		return this.resource.getInputStream();
 	}