2002/03/21 01:19:34

[org.ibex.core.git] / src / org / xwt / util / Vec.java

diff --git a/src/org/xwt/util/Vec.java b/src/org/xwt/util/Vec.java
new file mode 100644 (file)
index 0000000..ac8b149
--- /dev/null
+++ b/src/org/xwt/util/Vec.java
@@ -0,0 +1,102 @@
+// Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.xwt.util;
+
+import java.util.*;
+import java.io.*;
+
+/** 
+ *  An unsynchronized Vector implementation; same semantics as
+ *  java.util.Vector. Useful for JDK1.1 platforms that don't have
+ *  java.util.ArrayList.
+ *  @see java.util.Vector
+ */
+public class Vec implements Serializable {
+    
+    private Object[] store;
+    private int size = 0;
+    
+    public Vec() { this(10); }
+    public Vec(int i) { store = new Object[i]; }
+    
+    private void grow() { grow(store.length * 2); }
+    private void grow(int newsize) {
+        Object[] newstore = new Object[newsize];
+        System.arraycopy(store, 0, newstore, 0, size);
+        store = newstore;
+    }
+
+    public void removeAllElements() {
+        for(int i=0; i<size; i++) store[i] = null;
+        size = 0;
+    }
+
+    public void toArray(Object[] o) {
+        for(int i=0; i<size; i++)
+            o[i] = store[i];
+    }
+    
+    public int indexOf(Object o) {
+        for(int i=0; i<size; i++)
+            if (store[i] == o) return i;
+        return -1;
+    }
+    
+    public void addElement(Object o) {
+        if (size >= store.length) grow();
+        store[size++] = o;
+    }
+
+    public Object elementAt(int i) {
+        return store[i];
+    }
+    
+    public Object lastElement() {
+        if (size == 0) return null;
+        return store[size - 1];
+    }
+
+    public int size() { return size; }
+
+    public void setSize(int newSize) {
+        if (newSize < 0) throw new RuntimeException("tried to set size to negative value");
+        if (newSize > size) grow(newSize * 2);
+        if (newSize < size)
+            for(int i=newSize; i<size; i++)
+                store[i] = null;
+        size = newSize;
+    }
+
+    public void copyInto(Object[] out) {
+        for(int i=0; i<size; i++)
+            out[i] = store[i];
+    }
+
+    public void removeElementAt(int i) {
+        if (i >= size || i < 0) throw new RuntimeException("tried to remove an element outside the vector's limits");
+        for(int j=i; j<size - 1; j++)
+            store[j] = store[j + 1];
+        setSize(size - 1);
+    }
+
+    public void setElementAt(Object o, int i) {
+        if (i >= size) setSize(i);
+        store[i] = o;
+    }
+
+    public void removeElement(Object o) {
+        for(int i=0; i<size; i++)
+            if (store[i] == o) {
+                removeElementAt(i);
+                return;
+            }
+    }
+
+    public void insertElementAt(Object o, int at) {
+        if (size == store.length) grow();
+        for(int i=size; i>at; i--)
+            store[i] = store[i-1];
+        store[at] = o;
+        size++;
+    }
+    
+}