/*
* Copyright 2015 MiLaboratory.com
*
* 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 com.milaboratory.core.sequence;
import java.util.Arrays;
public abstract class ArraySeqBuilder<S extends AbstractSeq<S>, B extends ArraySeqBuilder<S, B>> implements SeqBuilder<S> {
byte[] data;
int size = 0;
ArraySeqBuilder() {
}
ArraySeqBuilder(byte[] data, int size) {
this.data = data;
this.size = size;
}
@Override
public int size() {
return size;
}
protected void ensureInternalCapacity(int newSize) {
if (size == -1)
throw new IllegalStateException("Destroyed.");
if (data == null)
if (newSize != 0)
data = new byte[Math.max(newSize, 10)];
else
return;
if (data.length < newSize)
data = Arrays.copyOf(data, Math.max(newSize, 3 * data.length / 2 + 1));
}
@Override
public B ensureCapacity(int capacity) {
if (size == -1)
throw new IllegalStateException("Destroyed.");
if (capacity > 0) {
if (data == null)
data = new byte[capacity];
else if (capacity > data.length)
data = Arrays.copyOf(data, capacity);
}
return (B) this;
}
abstract S createUnsafe(byte[] b);
abstract byte[] getUnsafe(S s);
@Override
public S createAndDestroy() {
S seq;
if (data == null)
return createUnsafe(new byte[0]);
if (data.length == size)
seq = createUnsafe(data);
else
seq = createUnsafe(Arrays.copyOf(data, size));
data = null;
size = -1;
return seq;
}
public B append(byte value) {
ensureCapacity(size + 1);
data[size++] = value;
return (B) this;
}
@Override
public B append(S seq) {
if (seq.size() == 0)
return (B) this;
ensureInternalCapacity(size + seq.size());
System.arraycopy(getUnsafe(seq), 0, data, size, seq.size());
size += seq.size();
return (B) this;
}
@Override
public abstract B clone();
}