removed Makefile; lifted repo/org.ibex.tool/src/ to src/

[org.ibex.tool.git] / src / org / eclipse / jdt / internal / compiler / codegen / FloatCache.java

diff --git a/src/org/eclipse/jdt/internal/compiler/codegen/FloatCache.java b/src/org/eclipse/jdt/internal/compiler/codegen/FloatCache.java
new file mode 100644 (file)
index 0000000..3bbe945
--- /dev/null
+++ b/src/org/eclipse/jdt/internal/compiler/codegen/FloatCache.java
@@ -0,0 +1,138 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.compiler.codegen;
+
+public class FloatCache {
+       private float keyTable[];
+       private int valueTable[];
+       private int elementSize;
+/**
+ * Constructs a new, empty hashtable. A default capacity and
+ * load factor is used. Note that the hashtable will automatically 
+ * grow when it gets full.
+ */
+public FloatCache() {
+       this(13);
+}
+/**
+ * Constructs a new, empty hashtable with the specified initial
+ * capacity.
+ * @param initialCapacity int
+ *  the initial number of buckets
+ */
+public FloatCache(int initialCapacity) {
+       elementSize = 0;
+       keyTable = new float[initialCapacity];
+       valueTable = new int[initialCapacity];
+}
+/**
+ * Clears the hash table so that it has no more elements in it.
+ */
+public void clear() {
+       for (int i = keyTable.length; --i >= 0;) {
+               keyTable[i] = 0.0f;
+               valueTable[i] = 0;
+       }
+       elementSize = 0;
+}
+/** Returns true if the collection contains an element for the key.
+ *
+ * @param key <CODE>float</CODE> the key that we are looking for
+ * @return boolean
+ */
+public boolean containsKey(float key) {
+       if (key == 0.0f) {
+               for (int i = 0, max = elementSize; i < max; i++) {
+                       if (keyTable[i] == 0.0f) {
+                               int value1 = Float.floatToIntBits(key);
+                               int value2 = Float.floatToIntBits(keyTable[i]);
+                               if (value1 == -2147483648 && value2 == -2147483648)
+                                       return true;
+                               if (value1 == 0 && value2 == 0)
+                                       return true;
+                       }
+               }
+       } else {
+               for (int i = 0, max = elementSize; i < max; i++) {
+                       if (keyTable[i] == key) {
+                               return true;
+                       }
+               }
+       }
+       return false;
+}
+/** Gets the object associated with the specified key in the
+ * hashtable.
+ * @param key <CODE>float</CODE> the specified key
+ * @return int the element for the key or -1 if the key is not
+ *  defined in the hash table.
+ */
+public int get(float key) {
+       if (key == 0.0f) {
+               for (int i = 0, max = elementSize; i < max; i++) {
+                       if (keyTable[i] == 0.0f) {
+                               int value1 = Float.floatToIntBits(key);
+                               int value2 = Float.floatToIntBits(keyTable[i]);
+                               if (value1 == -2147483648 && value2 == -2147483648)
+                                       return valueTable[i];
+                               if (value1 == 0 && value2 == 0)
+                                       return valueTable[i];
+                       }
+               }
+       } else {
+               for (int i = 0, max = elementSize; i < max; i++) {
+                       if (keyTable[i] == key) {
+                               return valueTable[i];
+                       }
+               }
+       }
+       return -1;
+}
+/**
+ * Puts the specified element into the hashtable, using the specified
+ * key.  The element may be retrieved by doing a get() with the same key.
+ * 
+ * @param key <CODE>float</CODE> the specified key in the hashtable
+ * @param value <CODE>int</CODE> the specified element
+ * @return int value
+ */
+public int put(float key, int value) {
+       if (elementSize == keyTable.length) {
+               // resize
+               System.arraycopy(keyTable, 0, (keyTable = new float[elementSize * 2]), 0, elementSize);
+               System.arraycopy(valueTable, 0, (valueTable = new int[elementSize * 2]), 0, elementSize);
+       }
+       keyTable[elementSize] = key;
+       valueTable[elementSize] = value;
+       elementSize++;
+       return value;
+}
+/**
+ * Converts to a rather lengthy String.
+ *
+ * @return String the ascii representation of the receiver
+ */
+public String toString() {
+       int max = elementSize;
+       StringBuffer buf = new StringBuffer();
+       buf.append("{"); //$NON-NLS-1$
+       for (int i = 0; i < max; ++i) {
+               if ((keyTable[i] != 0) || ((keyTable[i] == 0) && (valueTable[i] != 0))) {
+                       buf.append(keyTable[i]).append("->").append(valueTable[i]); //$NON-NLS-1$
+               }
+               if (i < max) {
+                       buf.append(", "); //$NON-NLS-1$
+               }
+       }
+       buf.append("}"); //$NON-NLS-1$
+       return buf.toString();
+}
+}