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Groovy example source code file (BufferManager.groovy)

This example Groovy source code file (BufferManager.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

buffermanager, buffermanager, created, created, deleted, deleted, list, list, logger

The Groovy BufferManager.groovy source code

/*
 * 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 14373 2008-12-11 14:25:07Z roshandawrani $
 * @author <a href="mailto:jason@planet57.com">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
    }
}

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