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16 package org.apache.cocoon.components.flow.java;
17
18 import java.util.EmptyStackException  ;
19
20
27 public class ContinuationStack implements java.io.Serializable {
28
29 private int[] istack;
30 private float[] fstack;
31 private double[] dstack;
32 private long[] lstack;
33 private Object [] astack;
34 private Object [] tstack;
35 private int iTop, fTop, dTop, lTop, aTop, tTop;
36
37 public ContinuationStack() {
38 istack = new int[10];
39 lstack = new long[5];
40 dstack = new double[5];
41 fstack = new float[5];
42 astack = new Object [10];
43 tstack = new Object [5];
44 }
45
46 public ContinuationStack(ContinuationStack parent) {
47 istack = new int[parent.istack.length];
48 lstack = new long[parent.lstack.length];
49 dstack = new double[parent.dstack.length];
50 fstack = new float[parent.fstack.length];
51 astack = new Object [parent.astack.length];
52 tstack = new Object [parent.tstack.length];
53 System.arraycopy(parent.istack, 0, istack, 0, parent.istack.length);
54 System.arraycopy(parent.lstack, 0, lstack, 0, parent.lstack.length);
55 System.arraycopy(parent.dstack, 0, dstack, 0, parent.dstack.length);
56 System.arraycopy(parent.fstack, 0, fstack, 0, parent.fstack.length);
57 System.arraycopy(parent.astack, 0, astack, 0, parent.astack.length);
58 System.arraycopy(parent.tstack, 0, tstack, 0, parent.tstack.length);
59 iTop = parent.iTop;
60 fTop = parent.fTop;
61 dTop = parent.dTop;
62 lTop = parent.lTop;
63 aTop = parent.aTop;
64 tTop = parent.tTop;
65 }
66
67 public double popDouble() {
68 if (dTop==0)
69 throw new EmptyStackException ();
70 double d = dstack[--dTop];
71 return d;
73 }
74
75 public float popFloat() {
76 if (fTop==0)
77 throw new EmptyStackException ();
78 float f = fstack[--fTop];
79 return f;
81 }
82
83 public int popInt() {
84 if (iTop==0)
85 throw new EmptyStackException ();
86 int i = istack[--iTop];
87 return i;
89 }
90
91 public long popLong() {
92 if (lTop==0)
93 throw new EmptyStackException ();
94 long l = lstack[--lTop];
95 return l;
97 }
98
99 public Object popObject() {
100 if (aTop==0)
101 throw new EmptyStackException ();
102 Object o = astack[--aTop];
103 return o;
105 }
106
107 public Object popReference() {
108 if (tTop==0)
109 throw new EmptyStackException ();
110 Object o = tstack[--tTop];
111 return o;
113 }
114
115 public void pushDouble(double d) {
116 dstack[dTop++] = d;
117 if (dTop == dstack.length) {
119 double[] hlp = new double[dstack.length + 10];
120 System.arraycopy(dstack, 0, hlp, 0, dstack.length);
121 dstack = hlp;
122 }
123 }
124
125 public void pushFloat(float f) {
126 fstack[fTop++] = f;
127 if (fTop == fstack.length) {
129 float[] hlp = new float[fstack.length + 10];
130 System.arraycopy(fstack, 0, hlp, 0, fstack.length);
131 fstack = hlp;
132 }
133 }
134
135 public void pushInt(int i) {
136 istack[iTop++] = i;
137 if (iTop == istack.length) {
139 int[] hlp = new int[istack.length + 10];
140 System.arraycopy(istack, 0, hlp, 0, istack.length);
141 istack = hlp;
142 }
143 }
144
145 public void pushLong(long l) {
146 lstack[lTop++] = l;
147 if (lTop == lstack.length) {
149 long[] hlp = new long[lstack.length + 10];
150 System.arraycopy(lstack, 0, hlp, 0, lstack.length);
151 lstack = hlp;
152 }
153 }
154
155 public void pushObject(Object o) {
156 astack[aTop++] = o;
157 if (aTop == astack.length) {
159 Object [] hlp = new Object [astack.length + 10];
160 System.arraycopy(astack, 0, hlp, 0, astack.length);
161 astack = hlp;
162 }
163 }
164
165 public void pushReference(Object o) {
166 tstack[tTop++] = o;
167 if (tTop == tstack.length) {
169 Object [] hlp = new Object [tstack.length + 10];
170 System.arraycopy(tstack, 0, hlp, 0, tstack.length);
171 tstack = hlp;
172 }
173 }
174
175 public String toString() {
176 return "i="+iTop +
177 ",l=" + lTop +
178 ",d=" + dTop +
179 ",f=" + fTop +
180 ",a=" + aTop +
181 ",t=" + tTop;
182 }
183 }
184 |
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