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/*
* Copyright 2002-2016 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.core.env;
import org.springframework.core.convert.ConversionException;
import org.springframework.util.ClassUtils;
/**
* {@link PropertyResolver} implementation that resolves property values against
* an underlying set of {@link PropertySources}.
*
* @author Chris Beams
* @since 3.1
* @see PropertySource
* @see PropertySources
* @see AbstractEnvironment
*/
public class PropertySourcesPropertyResolver extends AbstractPropertyResolver {
private final PropertySources propertySources;
/**
* Create a new resolver against the given property sources.
* @param propertySources the set of {@link PropertySource} objects to use
*/
public PropertySourcesPropertyResolver(PropertySources propertySources) {
this.propertySources = propertySources;
}
@Override
public boolean containsProperty(String key) {
if (this.propertySources != null) {
for (PropertySource propertySource : this.propertySources) {
if (propertySource.containsProperty(key)) {
return true;
}
}
}
return false;
}
@Override
public String getProperty(String key) {
return getProperty(key, String.class, true);
}
@Override
public T getProperty(String key, Class targetValueType) {
return getProperty(key, targetValueType, true);
}
@Override
protected String getPropertyAsRawString(String key) {
return getProperty(key, String.class, false);
}
protected T getProperty(String key, Class targetValueType, boolean resolveNestedPlaceholders) {
boolean debugEnabled = logger.isDebugEnabled();
if (logger.isTraceEnabled()) {
logger.trace(String.format("getProperty(\"%s\", %s)", key, targetValueType.getSimpleName()));
}
if (this.propertySources != null) {
for (PropertySource propertySource : this.propertySources) {
if (debugEnabled) {
logger.debug(String.format("Searching for key '%s' in [%s]", key, propertySource.getName()));
}
Object value = propertySource.getProperty(key);
if (value != null) {
Class valueType = value.getClass();
if (resolveNestedPlaceholders && value instanceof String) {
value = resolveNestedPlaceholders((String) value);
}
if (debugEnabled) {
logger.debug(String.format("Found key '%s' in [%s] with type [%s] and value '%s'",
key, propertySource.getName(), valueType.getSimpleName(), value));
}
if (!this.conversionService.canConvert(valueType, targetValueType)) {
throw new IllegalArgumentException(String.format(
"Cannot convert value [%s] from source type [%s] to target type [%s]",
value, valueType.getSimpleName(), targetValueType.getSimpleName()));
}
return this.conversionService.convert(value, targetValueType);
}
}
}
if (debugEnabled) {
logger.debug(String.format("Could not find key '%s' in any property source. Returning [null]", key));
}
return null;
}
@Override
public Class getPropertyAsClass(String key, Class targetValueType) {
boolean debugEnabled = logger.isDebugEnabled();
if (logger.isTraceEnabled()) {
logger.trace(String.format("getPropertyAsClass(\"%s\", %s)", key, targetValueType.getSimpleName()));
}
if (this.propertySources != null) {
for (PropertySource propertySource : this.propertySources) {
if (debugEnabled) {
logger.debug(String.format("Searching for key '%s' in [%s]", key, propertySource.getName()));
}
Object value = propertySource.getProperty(key);
if (value != null) {
if (debugEnabled) {
logger.debug(String.format("Found key '%s' in [%s] with value '%s'", key, propertySource.getName(), value));
}
Class clazz;
if (value instanceof String) {
try {
clazz = ClassUtils.forName((String) value, null);
}
catch (Exception ex) {
throw new ClassConversionException((String) value, targetValueType, ex);
}
}
else if (value instanceof Class) {
clazz = (Class)value;
}
else {
clazz = value.getClass();
}
if (!targetValueType.isAssignableFrom(clazz)) {
throw new ClassConversionException(clazz, targetValueType);
}
@SuppressWarnings("unchecked")
Class targetClass = (Class) clazz;
return targetClass;
}
}
}
if (debugEnabled) {
logger.debug(String.format("Could not find key '%s' in any property source. Returning [null]", key));
}
return null;
}
@SuppressWarnings("serial")
private static class ClassConversionException extends ConversionException {
public ClassConversionException(Class actual, Class expected) {
super(String.format("Actual type %s is not assignable to expected type %s", actual.getName(), expected.getName()));
}
public ClassConversionException(String actual, Class expected, Exception ex) {
super(String.format("Could not find/load class %s during attempt to convert to %s", actual, expected.getName()), ex);
}
}
}