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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 org.apache.tuscany.sca.implementation.data.jdbc;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.databinding.xml.SimpleXmlNodeImpl;
import org.apache.tuscany.sca.databinding.xml.XmlNode;
/**
* @version $Rev$ $Date$
*/
public class ResultSetXmlNodeImpl implements XmlNode {
private static final String NS = "";
private static final QName RESULT_SET = new QName(NS, "resultSet");
private static final QName RECORD = new QName(NS, "record");
private static final QName COLUMN = new QName(NS, "column");
private static final QName NAME = new QName(NS, "name");
private ResultSet resultSet;
private String[] columnNames;
/**
* @param resultSet
*/
public ResultSetXmlNodeImpl(ResultSet resultSet) {
super();
this.resultSet = resultSet;
try {
ResultSetMetaData metaData = resultSet.getMetaData();
columnNames = new String[metaData.getColumnCount()];
for (int i = 0; i < columnNames.length; i++) {
columnNames[i] = metaData.getColumnName(i + 1);
}
} catch (SQLException e) {
throw new IllegalStateException(e);
}
}
/**
* @see org.apache.tuscany.sca.databinding.xml.XmlNode#attributes()
*/
public List<XmlNode> attributes() {
return Collections.emptyList();
}
public Type getType() {
return Type.ELEMENT;
}
/**
* @see org.apache.tuscany.sca.databinding.xml.XmlNode#children()
*/
public Iterator<XmlNode> children() {
return new ResultSetIteraror();
}
private class ResultSetIteraror implements Iterator<XmlNode> {
private Boolean hasNext;
public ResultSetIteraror() {
}
public boolean hasNext() {
try {
if (hasNext == null) {
hasNext = resultSet.next();
}
return hasNext;
} catch (SQLException e) {
throw new IllegalStateException(e);
}
}
public XmlNode next() {
hasNext();
hasNext = null;
return new RecordXmlNodeImpl();
}
public void remove() {
}
}
/**
* @see org.apache.tuscany.sca.databinding.xml.XmlNode#getName()
*/
public QName getName() {
return RESULT_SET;
}
/**
* @see org.apache.tuscany.sca.databinding.xml.XmlNode#getValue()
*/
public String getValue() {
return null;
}
/**
* @see org.apache.tuscany.sca.databinding.xml.XmlNode#namespaces()
*/
public Map<String, String> namespaces() {
return Collections.emptyMap();
}
private class RecordXmlNodeImpl extends XmlNodeImpl {
int index = 0;
public Iterator<XmlNode> children() {
return new Iterator<XmlNode>() {
public boolean hasNext() {
return index < columnNames.length;
}
public XmlNode next() {
return new ColumnXmlNodeImpl(index++);
}
public void remove() {
}
};
}
public QName getName() {
return RECORD;
}
}
private class ColumnXmlNodeImpl extends XmlNodeImpl {
private int index;
/**
* @param index
*/
public ColumnXmlNodeImpl(int index) {
super();
this.index = index;
}
public List<XmlNode> attributes() {
XmlNode attr = new SimpleXmlNodeImpl(NAME, columnNames[index], XmlNode.Type.ATTRIBUTE);
return Arrays.asList(attr);
}
public Iterator<XmlNode> children() {
XmlNode[] nodes = {new ValueXmlNodeImpl(index)};
return Arrays.asList(nodes).iterator();
}
public QName getName() {
return COLUMN;
}
}
private class ValueXmlNodeImpl extends XmlNodeImpl {
private int index;
/**
* @param index
*/
public ValueXmlNodeImpl(int index) {
super();
this.index = index;
}
public String getValue() {
try {
return String.valueOf(resultSet.getObject(index + 1));
} catch (SQLException e) {
throw new IllegalStateException(e);
}
}
public Type getType() {
return Type.CHARACTERS;
}
}
private static abstract class XmlNodeImpl implements XmlNode {
public List<XmlNode> attributes() {
return Collections.emptyList();
}
public Iterator<XmlNode> children() {
return null;
}
public QName getName() {
return null;
}
public String getValue() {
return null;
}
public boolean isLeaf() {
return false;
}
public Map<String, String> namespaces() {
return Collections.emptyMap();
}
public Type getType() {
return Type.ELEMENT;
}
}
}
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