/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* 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.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.util.datastruct;
import org.encog.EncogError;
public class StackString {
private String[] stack;
private int head = 0;
public StackString(int size) {
this.stack = new String[size];
}
public boolean isEmpty() {
return this.head == 0;
}
public void push(String str) {
if( this.head==this.stack.length) {
throw new EncogError("Stack overflow");
}
this.stack[this.head++] = str;
}
public String pop() {
if( this.head==0 ) {
throw new EncogError("Stack is empty");
}
return this.stack[--this.head];
}
public int size() {
return this.head;
}
public String toString() {
StringBuilder result = new StringBuilder();
result.append("[StackString: ");
for(int i=head-1;i>=0;i--) {
result.append(this.stack[i]);
result.append(" ");
}
result.append("]");
return result.toString();
}
}