| /* |
| * 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.cocoon.components.flow.java; |
| |
| import java.util.EmptyStackException; |
| |
| /** |
| * Stack to store the frame information along the invocation trace. |
| * |
| * @author <a href="mailto:tcurdt@apache.org">Torsten Curdt</a> |
| * @author <a href="mailto:stephan@apache.org">Stephan Michels</a> |
| * @version CVS $Id$ |
| */ |
| public class ContinuationStack implements java.io.Serializable { |
| |
| private int[] istack; |
| private float[] fstack; |
| private double[] dstack; |
| private long[] lstack; |
| private Object[] astack; |
| private Object[] tstack; |
| private int iTop, fTop, dTop, lTop, aTop, tTop; |
| |
| public ContinuationStack() { |
| istack = new int[10]; |
| lstack = new long[5]; |
| dstack = new double[5]; |
| fstack = new float[5]; |
| astack = new Object[10]; |
| tstack = new Object[5]; |
| } |
| |
| public ContinuationStack(ContinuationStack parent) { |
| istack = new int[parent.istack.length]; |
| lstack = new long[parent.lstack.length]; |
| dstack = new double[parent.dstack.length]; |
| fstack = new float[parent.fstack.length]; |
| astack = new Object[parent.astack.length]; |
| tstack = new Object[parent.tstack.length]; |
| System.arraycopy(parent.istack, 0, istack, 0, parent.istack.length); |
| System.arraycopy(parent.lstack, 0, lstack, 0, parent.lstack.length); |
| System.arraycopy(parent.dstack, 0, dstack, 0, parent.dstack.length); |
| System.arraycopy(parent.fstack, 0, fstack, 0, parent.fstack.length); |
| System.arraycopy(parent.astack, 0, astack, 0, parent.astack.length); |
| System.arraycopy(parent.tstack, 0, tstack, 0, parent.tstack.length); |
| iTop = parent.iTop; |
| fTop = parent.fTop; |
| dTop = parent.dTop; |
| lTop = parent.lTop; |
| aTop = parent.aTop; |
| tTop = parent.tTop; |
| } |
| |
| public double popDouble() { |
| if (dTop==0) |
| throw new EmptyStackException(); |
| double d = dstack[--dTop]; |
| //System.out.println("pop double "+d+" "+toString()); |
| return d; |
| } |
| |
| public float popFloat() { |
| if (fTop==0) |
| throw new EmptyStackException(); |
| float f = fstack[--fTop]; |
| //System.out.println("pop float "+f+" "+toString()); |
| return f; |
| } |
| |
| public int popInt() { |
| if (iTop==0) |
| throw new EmptyStackException(); |
| int i = istack[--iTop]; |
| //System.out.println("pop int "+i+" "+toString()); |
| return i; |
| } |
| |
| public long popLong() { |
| if (lTop==0) |
| throw new EmptyStackException(); |
| long l = lstack[--lTop]; |
| //System.out.println("pop long "+l+" "+toString()); |
| return l; |
| } |
| |
| public Object popObject() { |
| if (aTop==0) |
| throw new EmptyStackException(); |
| Object o = astack[--aTop]; |
| //System.out.println("pop object "+o+" "+toString()); |
| return o; |
| } |
| |
| public Object popReference() { |
| if (tTop==0) |
| throw new EmptyStackException(); |
| Object o = tstack[--tTop]; |
| //System.out.println("pop reference "+o+" "+toString()); |
| return o; |
| } |
| |
| public void pushDouble(double d) { |
| dstack[dTop++] = d; |
| //System.out.println("push double "+d+" "+toString()); |
| if (dTop == dstack.length) { |
| double[] hlp = new double[dstack.length + 10]; |
| System.arraycopy(dstack, 0, hlp, 0, dstack.length); |
| dstack = hlp; |
| } |
| } |
| |
| public void pushFloat(float f) { |
| fstack[fTop++] = f; |
| //System.out.println("push float "+f+" "+toString()); |
| if (fTop == fstack.length) { |
| float[] hlp = new float[fstack.length + 10]; |
| System.arraycopy(fstack, 0, hlp, 0, fstack.length); |
| fstack = hlp; |
| } |
| } |
| |
| public void pushInt(int i) { |
| istack[iTop++] = i; |
| //System.out.println("push int "+i+" "+toString()); |
| if (iTop == istack.length) { |
| int[] hlp = new int[istack.length + 10]; |
| System.arraycopy(istack, 0, hlp, 0, istack.length); |
| istack = hlp; |
| } |
| } |
| |
| public void pushLong(long l) { |
| lstack[lTop++] = l; |
| //System.out.println("push long "+l+" "+toString()); |
| if (lTop == lstack.length) { |
| long[] hlp = new long[lstack.length + 10]; |
| System.arraycopy(lstack, 0, hlp, 0, lstack.length); |
| lstack = hlp; |
| } |
| } |
| |
| public void pushObject(Object o) { |
| astack[aTop++] = o; |
| //System.out.println("push object "+o+" "+toString()); |
| if (aTop == astack.length) { |
| Object[] hlp = new Object[astack.length + 10]; |
| System.arraycopy(astack, 0, hlp, 0, astack.length); |
| astack = hlp; |
| } |
| } |
| |
| public void pushReference(Object o) { |
| tstack[tTop++] = o; |
| //System.out.println("push reference "+o+" "+toString()); |
| if (tTop == tstack.length) { |
| Object[] hlp = new Object[tstack.length + 10]; |
| System.arraycopy(tstack, 0, hlp, 0, tstack.length); |
| tstack = hlp; |
| } |
| } |
| |
| public String toString() { |
| return "i="+iTop + |
| ",l=" + lTop + |
| ",d=" + dTop + |
| ",f=" + fTop + |
| ",a=" + aTop + |
| ",t=" + tTop; |
| } |
| } |