/*
* Copyright 2003-2013 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 groovy.sql;
import java.sql.ResultSetMetaData;
import groovy.lang.GroovyObjectSupport;
import groovy.lang.MissingPropertyException;
import groovy.lang.ReadOnlyPropertyException;
import org.codehaus.groovy.runtime.InvokerHelper;
/**
* This class defines a wrapper for accessing a specific column in <code>ResultSetMetaData</code>.
* This allows iteration over columns using idiomatic Groovy, e.g.:
* <pre>
* meta.each {col ->
* println col.columnName
* }
* </pre>
* All <code>ResultSetMetaData</code> column methods taking a column index
* are available on a column either as a no-arg getter or via a property.
* <p>
* This wrapper is created by an iterator invoked for <code>ResultSetMetaData</code>.
*
* @author John Hurst
* @see org.codehaus.groovy.runtime.SqlGroovyMethods
*/
public class ResultSetMetaDataWrapper extends GroovyObjectSupport {
private ResultSetMetaData target;
private int index;
public ResultSetMetaDataWrapper(ResultSetMetaData target, int index) {
this.target = target;
this.index = index;
}
private Object[] getIndexedArgs(Object[] originalArgs) {
Object[] result = new Object[originalArgs.length + 1];
result[0] = index;
for (int i = 0, originalArgsLength = originalArgs.length; i < originalArgsLength; i++) {
result[i + 1] = originalArgs[i];
}
return result;
}
@Override
public Object invokeMethod(String name, Object args) {
Object[] indexedArgs = getIndexedArgs((Object[]) args);
return InvokerHelper.invokeMethod(target, name, indexedArgs);
}
private String getPropertyGetterName(String prop) {
if (prop == null || prop.length() < 1) {
throw new MissingPropertyException(prop, target.getClass());
}
return "get" + prop.substring(0, 1).toUpperCase() + prop.substring(1);
}
@Override
public Object getProperty(String property) {
return invokeMethod(getPropertyGetterName(property), new Object[0]);
}
@Override
public void setProperty(String property, Object newValue) {
throw new ReadOnlyPropertyException(property, target.getClass());
}
}