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/*
* 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.thrift.protocol;
import java.util.Arrays;
/**
* ShortStack is a short-specific Stack implementation written for the express purpose of very fast
* operations on TCompactProtocol's field id stack. This implementation performs at least 10x faster
* than java.util.Stack.
*/
class ShortStack {
private short[] vector;
/** Always points to the next location */
private int top = 0;
public ShortStack(int initialCapacity) {
vector = new short[initialCapacity];
}
public short pop() {
return vector[--top];
}
public void push(short pushed) {
if (vector.length == top) {
grow();
}
vector[top++] = pushed;
}
private void grow() {
vector = Arrays.copyOf(vector, vector.length << 1);
}
public void clear() {
top = 0;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("<ShortStack vector:[");
for (int i = 0; i < vector.length; i++) {
boolean isTop = (i == (top - 1));
short value = vector[i];
if (i != 0) {
sb.append(' ');
}
if (isTop) {
sb.append(">>").append(value).append("<<");
} else {
sb.append(value);
}
}
sb.append("]>");
return sb.toString();
}
}
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