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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 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 org.codehaus.groovy.tools.shell
import org.codehaus.groovy.tools.shell.util.Logger
/**
* Manages the shells buffers.
*
* @version $Id: BufferManager.groovy 14374 2008-12-11 14:52:07Z roshandawrani $
* @author Jason Dillon
*/
class BufferManager
{
protected final Logger log = Logger.create(this.class)
final List buffers = []
int selected
BufferManager() {
reset()
}
void reset() {
buffers.clear()
create(true)
log.debug('Buffers reset')
}
List current() {
assert !buffers.isEmpty()
return buffers[selected]
}
void select(final int index) {
assert index >= 0 && index < buffers.size()
selected = index
}
int create(final boolean select) {
buffers << []
def i = buffers.size() - 1
if (select) {
this.select(i)
}
if (log.debugEnabled) {
log.debug("Created new buffer with index: $i")
}
return i
}
void delete(final int index) {
assert index >= 0 && index < buffers.size()
buffers.remove(index)
if (log.debugEnabled) {
log.debug("Deleted buffer with index: $index")
}
}
int size() {
return buffers.size()
}
//
// Selected operators
//
void deleteSelected() {
delete(selected)
def i = selected - 1
if (i < 0) {
select(0)
}
else {
select(i)
}
}
void clearSelected() {
current().clear()
}
void updateSelected(final List buffer) {
assert buffer != null
buffers[selected] = buffer
}
}