/*
* 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.mina.util.byteaccess;
import java.nio.ByteOrder;
import org.apache.mina.util.byteaccess.ByteArray.Cursor;
import org.apache.mina.util.byteaccess.CompositeByteArray.CursorListener;
/**
* Provides common functionality between the
* <code>CompositeByteArrayRelativeReader</code> and
* <code>CompositeByteArrayRelativeWriter</code>.
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
abstract class CompositeByteArrayRelativeBase {
/**
* The underlying <code>CompositeByteArray</code>.
*/
protected final CompositeByteArray cba;
/**
* A cursor of the underlying <code>CompositeByteArray</code>. This
* cursor is never moved directly; its position only changes through calls
* to relative read or write methods.
*/
protected final Cursor cursor;
/**
*
* Creates a new instance of CompositeByteArrayRelativeBase.
*
* @param cba
* The {@link CompositeByteArray} that will be the base for this class
*/
public CompositeByteArrayRelativeBase(CompositeByteArray cba) {
this.cba = cba;
cursor = cba.cursor(cba.first(), new CursorListener() {
public void enteredFirstComponent(int componentIndex, ByteArray component) {
// Do nothing.
}
public void enteredLastComponent(int componentIndex, ByteArray component) {
assert false;
}
public void enteredNextComponent(int componentIndex, ByteArray component) {
cursorPassedFirstComponent();
}
public void enteredPreviousComponent(int componentIndex, ByteArray component) {
assert false;
}
});
}
/**
* @inheritDoc
*/
public final int getRemaining() {
return cursor.getRemaining();
}
/**
* @inheritDoc
*/
public final boolean hasRemaining() {
return cursor.hasRemaining();
}
/**
* @inheritDoc
*/
public ByteOrder order() {
return cba.order();
}
/**
* Make a <code>ByteArray</code> available for access at the end of this object.
*/
public final void append(ByteArray ba) {
cba.addLast(ba);
}
/**
* Free all resources associated with this object.
*/
public final void free() {
cba.free();
}
/**
* Get the index that will be used for the next access.
*/
public final int getIndex() {
return cursor.getIndex();
}
/**
* Get the index after the last byte that can be accessed.
*/
public final int last() {
return cba.last();
}
/**
* Called whenever the cursor has passed from the <code>cba</code>'s
* first component. As the first component is no longer used, this provides
* a good opportunity for subclasses to perform some action on it (such as
* freeing it).
*/
protected abstract void cursorPassedFirstComponent();
}