//
// MessagePack for Java
//
// Copyright (C) 2009-2011 FURUHASHI Sadayuki
//
// 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.msgpack.packer;
import org.msgpack.MessageTypeException;
final class PackerStack {
private int top;
private byte[] types;
private int[] counts;
static final int MAX_STACK_SIZE = 128;
private static final byte TYPE_INVALID = 0;
private static final byte TYPE_ARRAY = 1;
private static final byte TYPE_MAP = 2;
public PackerStack() {
this.top = 0;
this.types = new byte[MAX_STACK_SIZE];
this.counts = new int[MAX_STACK_SIZE];
this.types[0] = TYPE_INVALID;
}
public void pushArray(int size) {
top++;
types[top] = TYPE_ARRAY;
counts[top] = size;
}
public void pushMap(int size) {
top++;
types[top] = TYPE_MAP;
counts[top] = size*2;
}
public void checkCount() {
if(counts[top] > 0) {
return;
}
if(types[top] == TYPE_ARRAY) {
throw new MessageTypeException("Array is end but writeArrayEnd() is not called");
} else if(types[top] == TYPE_MAP) {
throw new MessageTypeException("Map is end but writeMapEnd() is not called");
} else {
// empty
return;
}
}
public void reduceCount() {
counts[top]--;
}
public void pop() {
top--;
}
public int getDepth() {
return top;
}
public int getTopCount() {
return counts[top];
}
public boolean topIsArray() {
return types[top] == TYPE_ARRAY;
}
public boolean topIsMap() {
return types[top] == TYPE_MAP;
}
}