/*
* 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.commons.beanutils;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.NoSuchElementException;
Implementation of java.util.Iterator
returned by the
iterator()
method of ResultSetDynaClass
. Each object returned by this iterator will be a DynaBean
that represents a single row from the result set being wrapped.
Version: $Id$
/**
* <p>Implementation of <code>java.util.Iterator</code> returned by the
* <code>iterator()</code> method of {@link ResultSetDynaClass}. Each
* object returned by this iterator will be a {@link DynaBean} that
* represents a single row from the result set being wrapped.</p>
*
* @version $Id$
*/
public class ResultSetIterator implements DynaBean, Iterator<DynaBean> {
// ------------------------------------------------------------ Constructor
Construct an Iterator
for the result set being wrapped by the specified ResultSetDynaClass
.
Params: - dynaClass – The
ResultSetDynaClass
wrapping the result set we will iterate over
/**
* <p>Construct an <code>Iterator</code> for the result set being wrapped
* by the specified {@link ResultSetDynaClass}.</p>
*
* @param dynaClass The {@link ResultSetDynaClass} wrapping the
* result set we will iterate over
*/
ResultSetIterator(final ResultSetDynaClass dynaClass) {
this.dynaClass = dynaClass;
}
// ----------------------------------------------------- Instance Variables
Flag indicating whether the result set is currently positioned at a
row for which we have not yet returned an element in the iteration.
/**
* <p>Flag indicating whether the result set is currently positioned at a
* row for which we have not yet returned an element in the iteration.</p>
*/
protected boolean current = false;
The ResultSetDynaClass
we are associated with.
/**
* <p>The {@link ResultSetDynaClass} we are associated with.</p>
*/
protected ResultSetDynaClass dynaClass = null;
Flag indicating whether the result set has indicated that there are
no further rows.
/**
* <p>Flag indicating whether the result set has indicated that there are
* no further rows.</p>
*/
protected boolean eof = false;
// ------------------------------------------------------- DynaBean Methods
Does the specified mapped property contain a value for the specified
key value?
Params: - name – Name of the property to check
- key – Name of the key to check
Throws: - IllegalArgumentException – if there is no property
of the specified name
Returns: true if the mapped property contains a value for
the specified key, otherwise false
/**
* Does the specified mapped property contain a value for the specified
* key value?
*
* @param name Name of the property to check
* @param key Name of the key to check
* @return <code>true<code> if the mapped property contains a value for
* the specified key, otherwise <code>false</code>
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public boolean contains(final String name, final String key) {
throw new UnsupportedOperationException
("FIXME - mapped properties not currently supported");
}
Return the value of a simple property with the specified name.
Params: - name – Name of the property whose value is to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
Returns: The property's value
/**
* Return the value of a simple property with the specified name.
*
* @param name Name of the property whose value is to be retrieved
* @return The property's value
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public Object get(final String name) {
if (dynaClass.getDynaProperty(name) == null) {
throw new IllegalArgumentException(name);
}
try {
return dynaClass.getObjectFromResultSet(name);
} catch (final SQLException e) {
throw new RuntimeException
("get(" + name + "): SQLException: " + e);
}
}
Return the value of an indexed property with the specified name.
Params: - name – Name of the property whose value is to be retrieved
- index – Index of the value to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not indexed
- IndexOutOfBoundsException – if the specified index
is outside the range of the underlying property
- NullPointerException – if no array or List has been
initialized for this property
Returns: The indexed property's value
/**
* Return the value of an indexed property with the specified name.
*
* @param name Name of the property whose value is to be retrieved
* @param index Index of the value to be retrieved
* @return The indexed property's value
*
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
* @throws NullPointerException if no array or List has been
* initialized for this property
*/
public Object get(final String name, final int index) {
throw new UnsupportedOperationException
("FIXME - indexed properties not currently supported");
}
Return the value of a mapped property with the specified name,
or null
if there is no value for the specified key.
Params: - name – Name of the property whose value is to be retrieved
- key – Key of the value to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not mapped
Returns: The mapped property's value
/**
* Return the value of a mapped property with the specified name,
* or <code>null</code> if there is no value for the specified key.
*
* @param name Name of the property whose value is to be retrieved
* @param key Key of the value to be retrieved
* @return The mapped property's value
*
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public Object get(final String name, final String key) {
throw new UnsupportedOperationException
("FIXME - mapped properties not currently supported");
}
Return the DynaClass
instance that describes the set of
properties available for this DynaBean.
Returns: The associated DynaClass
/**
* Return the <code>DynaClass</code> instance that describes the set of
* properties available for this DynaBean.
*
* @return The associated DynaClass
*/
public DynaClass getDynaClass() {
return (this.dynaClass);
}
Remove any existing value for the specified key on the
specified mapped property.
Params: - name – Name of the property for which a value is to
be removed
- key – Key of the value to be removed
Throws: - IllegalArgumentException – if there is no property
of the specified name
/**
* Remove any existing value for the specified key on the
* specified mapped property.
*
* @param name Name of the property for which a value is to
* be removed
* @param key Key of the value to be removed
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public void remove(final String name, final String key) {
throw new UnsupportedOperationException
("FIXME - mapped operations not currently supported");
}
Set the value of a simple property with the specified name.
Params: - name – Name of the property whose value is to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- NullPointerException – if an attempt is made to set a
primitive property to null
/**
* Set the value of a simple property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param value Value to which this property is to be set
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws NullPointerException if an attempt is made to set a
* primitive property to null
*/
public void set(final String name, final Object value) {
if (dynaClass.getDynaProperty(name) == null) {
throw new IllegalArgumentException(name);
}
try {
dynaClass.getResultSet().updateObject(name, value);
} catch (final SQLException e) {
throw new RuntimeException
("set(" + name + "): SQLException: " + e);
}
}
Set the value of an indexed property with the specified name.
Params: - name – Name of the property whose value is to be set
- index – Index of the property to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not indexed
- IndexOutOfBoundsException – if the specified index
is outside the range of the underlying property
/**
* Set the value of an indexed property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param index Index of the property to be set
* @param value Value to which this property is to be set
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
*/
public void set(final String name, final int index, final Object value) {
throw new UnsupportedOperationException
("FIXME - indexed properties not currently supported");
}
Set the value of a mapped property with the specified name.
Params: - name – Name of the property whose value is to be set
- key – Key of the property to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not mapped
/**
* Set the value of a mapped property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param key Key of the property to be set
* @param value Value to which this property is to be set
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public void set(final String name, final String key, final Object value) {
throw new UnsupportedOperationException
("FIXME - mapped properties not currently supported");
}
// ------------------------------------------------------- Iterator Methods
Return true
if the iteration has more elements.
Returns: true
if the result set has another
row, otherwise false
/**
* <p>Return <code>true</code> if the iteration has more elements.</p>
*
* @return <code>true</code> if the result set has another
* row, otherwise <code>false</code>
*/
public boolean hasNext() {
try {
advance();
return (!eof);
} catch (final SQLException e) {
throw new RuntimeException("hasNext(): SQLException: " + e);
}
}
Return the next element in the iteration.
Returns: advance to the new row and return this
/**
* <p>Return the next element in the iteration.</p>
*
* @return advance to the new row and return this
*/
public DynaBean next() {
try {
advance();
if (eof) {
throw new NoSuchElementException();
}
current = false;
return (this);
} catch (final SQLException e) {
throw new RuntimeException("next(): SQLException: " + e);
}
}
Remove the current element from the iteration. This method is
not supported.
/**
* <p>Remove the current element from the iteration. This method is
* not supported.</p>
*/
public void remove() {
throw new UnsupportedOperationException("remove()");
}
// ------------------------------------------------------ Protected Methods
Advance the result set to the next row, if there is not a current
row (and if we are not already at eof).
Throws: - SQLException – if the result set throws an exception
/**
* <p>Advance the result set to the next row, if there is not a current
* row (and if we are not already at eof).</p>
*
* @throws SQLException if the result set throws an exception
*/
protected void advance() throws SQLException {
if (!current && !eof) {
if (dynaClass.getResultSet().next()) {
current = true;
eof = false;
} else {
current = false;
eof = true;
}
}
}
}