public class ObjectCache {
public Object keyTable[];
+
public int valueTable[];
+
int elementSize;
+
int threshold;
-/**
- * Constructs a new, empty hashtable. A default capacity is used.
- * Note that the hashtable will automatically grow when it gets full.
- */
-public ObjectCache() {
- this(13);
-}
-/**
- * Constructs a new, empty hashtable with the specified initial
- * capacity.
- * @param initialCapacity int
- * the initial number of buckets
- */
-public ObjectCache(int initialCapacity) {
- this.elementSize = 0;
- this.threshold = (int) (initialCapacity * 0.66f);
- this.keyTable = new Object[initialCapacity];
- this.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] = null;
- valueTable[i] = 0;
+
+ /**
+ * Constructs a new, empty hashtable. A default capacity is used. Note that
+ * the hashtable will automatically grow when it gets full.
+ */
+ public ObjectCache() {
+ this(13);
}
- elementSize = 0;
-}
-/** Returns true if the collection contains an element for the key.
- *
- * @param char[] key the key that we are looking for
- * @return boolean
- */
-public boolean containsKey(Object key) {
- int index = hashCode(key);
- while (keyTable[index] != null) {
- if (keyTable[index] == key)
- return true;
- index = (index + 1) % keyTable.length;
+
+ /**
+ * Constructs a new, empty hashtable with the specified initial capacity.
+ *
+ * @param initialCapacity
+ * int the initial number of buckets
+ */
+ public ObjectCache(int initialCapacity) {
+ this.elementSize = 0;
+ this.threshold = (int) (initialCapacity * 0.66f);
+ this.keyTable = new Object[initialCapacity];
+ this.valueTable = new int[initialCapacity];
}
- return false;
-}
-/** Gets the object associated with the specified key in the
- * hashtable.
- * @param key <CODE>char[]</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(Object key) {
- int index = hashCode(key);
- while (keyTable[index] != null) {
- if (keyTable[index] == key)
- return valueTable[index];
- index = (index + 1) % keyTable.length;
+
+ /**
+ * 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] = null;
+ valueTable[i] = 0;
+ }
+ elementSize = 0;
}
- return -1;
-}
-/**
- * Return the hashcode for the key parameter
- *
- * @param key net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding
- * @return int
- */
-public int hashCode(Object key) {
- return (key.hashCode() & 0x7FFFFFFF) % keyTable.length;
-}
-/**
- * Puts the specified element into the hashtable, using the specified
- * key. The element may be retrieved by doing a get() with the same key.
- * The key and the element cannot be null.
- *
- * @param key <CODE>Object</CODE> the specified key in the hashtable
- * @param value <CODE>int</CODE> the specified element
- * @return int the old value of the key, or -1 if it did not have one.
- */
-public int put(Object key, int value) {
- int index = hashCode(key);
- while (keyTable[index] != null) {
- if (keyTable[index] == key)
- return valueTable[index] = value;
- index = (index + 1) % keyTable.length;
+
+ /**
+ * Returns true if the collection contains an element for the key.
+ *
+ * @param char[]
+ * key the key that we are looking for
+ * @return boolean
+ */
+ public boolean containsKey(Object key) {
+ int index = hashCode(key);
+ while (keyTable[index] != null) {
+ if (keyTable[index] == key)
+ return true;
+ index = (index + 1) % keyTable.length;
+ }
+ return false;
}
- keyTable[index] = key;
- valueTable[index] = value;
- // assumes the threshold is never equal to the size of the table
- if (++elementSize > threshold)
- rehash();
- return value;
-}
-/**
- * Rehashes the content of the table into a bigger table.
- * This method is called automatically when the hashtable's
- * size exceeds the threshold.
- */
-private void rehash() {
- ObjectCache newHashtable = new ObjectCache(keyTable.length * 2);
- for (int i = keyTable.length; --i >= 0;)
- if (keyTable[i] != null)
- newHashtable.put(keyTable[i], valueTable[i]);
-
- this.keyTable = newHashtable.keyTable;
- this.valueTable = newHashtable.valueTable;
- this.threshold = newHashtable.threshold;
-}
-/**
- * Returns the number of elements contained in the hashtable.
- *
- * @return <CODE>int</CODE> The size of the table
- */
-public int size() {
- return elementSize;
-}
-/**
- * Converts to a rather lengthy String.
- *
- * @return String the ascii representation of the receiver
- */
-public String toString() {
- int max = size();
- StringBuffer buf = new StringBuffer();
- buf.append("{"); //$NON-NLS-1$
- for (int i = 0; i < max; ++i) {
- if (keyTable[i] != null) {
- buf.append(keyTable[i]).append("->").append(valueTable[i]); //$NON-NLS-1$
+ /**
+ * Gets the object associated with the specified key in the hashtable.
+ *
+ * @param key
+ * <CODE>char[]</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(Object key) {
+ int index = hashCode(key);
+ while (keyTable[index] != null) {
+ if (keyTable[index] == key)
+ return valueTable[index];
+ index = (index + 1) % keyTable.length;
}
- if (i < max) {
- buf.append(", "); //$NON-NLS-1$
+ return -1;
+ }
+
+ /**
+ * Return the hashcode for the key parameter
+ *
+ * @param key
+ * net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding
+ * @return int
+ */
+ public int hashCode(Object key) {
+ return (key.hashCode() & 0x7FFFFFFF) % keyTable.length;
+ }
+
+ /**
+ * Puts the specified element into the hashtable, using the specified key.
+ * The element may be retrieved by doing a get() with the same key. The key
+ * and the element cannot be null.
+ *
+ * @param key
+ * <CODE>Object</CODE> the specified key in the hashtable
+ * @param value
+ * <CODE>int</CODE> the specified element
+ * @return int the old value of the key, or -1 if it did not have one.
+ */
+ public int put(Object key, int value) {
+ int index = hashCode(key);
+ while (keyTable[index] != null) {
+ if (keyTable[index] == key)
+ return valueTable[index] = value;
+ index = (index + 1) % keyTable.length;
}
+ keyTable[index] = key;
+ valueTable[index] = value;
+
+ // assumes the threshold is never equal to the size of the table
+ if (++elementSize > threshold)
+ rehash();
+ return value;
+ }
+
+ /**
+ * Rehashes the content of the table into a bigger table. This method is
+ * called automatically when the hashtable's size exceeds the threshold.
+ */
+ private void rehash() {
+ ObjectCache newHashtable = new ObjectCache(keyTable.length * 2);
+ for (int i = keyTable.length; --i >= 0;)
+ if (keyTable[i] != null)
+ newHashtable.put(keyTable[i], valueTable[i]);
+
+ this.keyTable = newHashtable.keyTable;
+ this.valueTable = newHashtable.valueTable;
+ this.threshold = newHashtable.threshold;
+ }
+
+ /**
+ * Returns the number of elements contained in the hashtable.
+ *
+ * @return <CODE>int</CODE> The size of the table
+ */
+ public int size() {
+ return elementSize;
+ }
+
+ /**
+ * Converts to a rather lengthy String.
+ *
+ * @return String the ascii representation of the receiver
+ */
+ public String toString() {
+ int max = size();
+ StringBuffer buf = new StringBuffer();
+ buf.append("{"); //$NON-NLS-1$
+ for (int i = 0; i < max; ++i) {
+ if (keyTable[i] != null) {
+ 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();
}
- buf.append("}"); //$NON-NLS-1$
- return buf.toString();
-}
}
git://secure.phpeclipse.com / phpeclipse.git / blobdiff