groovy.sql.ResultSetMetaDataWrapper Maven / Gradle / Ivy
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 ResultSetMetaData
.
* This allows iteration over columns using idiomatic Groovy, e.g.:
*
* meta.each {col ->
* println col.columnName
* }
*
* All ResultSetMetaData
column methods taking a column index
* are available on a column either as a no-arg getter or via a property.
*
* This wrapper is created by an iterator invoked for ResultSetMetaData
.
*
* @author John Hurst
* @see org.codehaus.groovy.runtime.SqlGroovyMethods
*/
public class ResultSetMetaDataWrapper extends GroovyObjectSupport {
private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
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), EMPTY_OBJECT_ARRAY);
}
@Override
public void setProperty(String property, Object newValue) {
throw new ReadOnlyPropertyException(property, target.getClass());
}
}