SimpleCache (org.eclipse.xtext.util 2.29.0.M3 API)

java.lang.Object
- org.eclipse.xtext.util.SimpleCache<Key,Value>

```
public class SimpleCache<Key,Value>
extends java.lang.Object
```
A primitive cache implementation. The SimpleCache allows to cache lazily computable values. Subsequent calls to the computation algorithm with equal parameters have to yield equal results. Attention: The algorithm may not depend on itself in a circular manner. E.g. the following will lead to a stack overflow:
```
 SimpleCache<K, V> cache = new SimpleCache<K, V>(new Function<K, V>() {
   public V apply(K k) {
     // DON'T DO THIS
     if (k == k1) {
       return cache.get(k2).method();
     } else if (k == k2) {
       return cache.get(k1).method();
     }
     return null;
   }
 });
 
```
The cache uses weak references to the keys but the values are strongly referenced. This leads to the conclusion, that the computed values should not refer to the keys because no cache entry will be reclaimend automatically. In such cases, clients have to discard the values for a key explicitly. Please note that Function.apply(Object) may be invoked concurrently while the cache itself is threadsafe.

Constructor Summary

Constructors
Constructor Description

SimpleCache(com.google.common.base.Function<Key,Value> f)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`
`void`	`discard(Key k)`
`Value`	`get(Key k)`
`int`	`getSize()`
`boolean`	`hasCachedValue(Key key)`
`boolean`	`isEmpty()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleCache

public SimpleCache(com.google.common.base.Function<Key,Value> f)

Method Detail

get
```
public Value get(Key k)
```

clear
```
public void clear()
```

discard
```
public void discard(Key k)
```

hasCachedValue

public boolean hasCachedValue(Key key)

getSize
```
public int getSize()
```

isEmpty
```
public boolean isEmpty()
```