Examples of org.apache.excalibur.source.SourceValidity

org.apache.excalibur.source.SourceValidity
A SourceValidity object contains all information to check if a Source object is still valid.
There are two possibilities:
- The validity object has all information to check by itself if it is valid (e.g. given an expires date).
- The validity object possibility needs another (newer) validity object to compare against (e.g. to test a last modification date).
To avoid testing what the actual implementation of the validity object supports, the invocation order is to first call {@link #isValid()} and only if this resultis 0 (i.e. "don't know"), then to call {@link #isValid(SourceValidity)}.
Remember to call {@link #isValid(SourceValidity)} when {@link #isValid()} returned0 ! @author Avalon Development Team @version CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:26 $

            file = new File(file.getAbsolutePath()+".cxml");
            if ( file.exists() ) {
                altContent = this.get(file);
            }
            if ( content != null || altContent != null ) {
                SourceValidity val = new FileTimeStampValidity(file);
                response = new ExtendedCachedResponse(val, content);
                ((ExtendedCachedResponse)response).setAlternativeResponse(altContent);
            }
        }
        return response;

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        }
        
        if (checkValidity) {
            
            final ExpiresValidity cacheValidity = (ExpiresValidity) this.response.getValidityObjects()[0];
            final SourceValidity sourceValidity = this.response.getValidityObjects()[1];
            
            boolean remove = false;
            if (this.expires == 0) {
                if (getLogger().isDebugEnabled()) {
                    getLogger().debug("Force invalidation of cached response" +

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    protected void initMetaResponse() throws IOException {
        boolean storeResponse = false;
        CachedSourceResponse response = this.response;
        if (response == null) {
            if (this.expires != 0) {
                final SourceValidity cacheValidity = new ExpiresValidity(getExpiration());
                final SourceValidity sourceValidity = source.getValidity();
                response = new CachedSourceResponse(new SourceValidity[] {cacheValidity, sourceValidity});
                storeResponse = true;
            }
            else {
                response = new CachedSourceResponse(null);

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        boolean storeResponse = false;
        /* delay caching the response until we have a valid new one */
        CachedSourceResponse response = this.response;
        if (response == null) {
            if (this.expires != 0) {
                final SourceValidity cacheValidity = new ExpiresValidity(getExpiration());
                final SourceValidity sourceValidity = source.getValidity();
                response = new CachedSourceResponse(new SourceValidity[] {cacheValidity, sourceValidity});
                storeResponse = true;
            }
            else {
                response = new CachedSourceResponse(null);

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        boolean storeResponse = false;
        /* delay caching the response until we have a valid new one */
        CachedSourceResponse response = this.response;
        if (response == null) {
            if (this.expires != 0) {
                final SourceValidity cacheValidity = new ExpiresValidity(getExpiration());
                final SourceValidity sourceValidity = source.getValidity();
                response = new CachedSourceResponse(new SourceValidity[] {cacheValidity, sourceValidity});
                storeResponse = true;
            }
            else {
                response = new CachedSourceResponse(null);

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      Object result = this.checkValidity(key, parameters, forcedLoad, adapter);
            
      if (!(result instanceof SourceValidity))
        return new Object[]{result, Boolean.FALSE};
      SourceValidity newValidity = (SourceValidity)result; 


      this.lock.releaseReadLock();
      this.lock.writeLock();
      
      // check validity again in case of another thread has already loaded

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                                  Map parameters, 
                                  boolean forcedLoad, 
                                  ProfileLS adapter) {
    Object[] objects = (Object[])this.attributes.get(key);


    SourceValidity sourceValidity = null;
    int valid = SourceValidity.INVALID;
    if (objects != null) {
      sourceValidity = (SourceValidity) objects[1];
      valid = sourceValidity.isValid();
      if (!forcedLoad && valid == SourceValidity.VALID)
        return objects[0];
    }


    SourceValidity newValidity = adapter.getValidity(key, parameters);
    if (!forcedLoad && valid == SourceValidity.UNKNOWN) {
      if (sourceValidity.isValid(newValidity) == SourceValidity.VALID)
        return objects[0];
    }

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        AggregatedValidity validity = new AggregatedValidity();
        SourceInspector inspector;
        final Iterator inspectors = m_inspectors.iterator();
        while (inspectors.hasNext()) {
            inspector = (SourceInspector) inspectors.next();
            SourceValidity sv = inspector.getValidity(source);
            if (sv == null) {
                return null;
            }
            validity.add(sv);
        }

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        this.delay = delay;
    }
    
    public void addSource(Source src) {
        if (this.uris != null) {
            SourceValidity validity = src.getValidity();
            if (validity == null) {
                // one of the sources has no validity : this object will always be invalid
                this.uris = null;
            } else {
                // Add the validity and URI to the list

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    }
    
    private int computeStatus(SourceResolver resolver) {
        List validities = super.getValidities();
        for (int i = 0; i < validities.size(); i++) {
            SourceValidity validity = (SourceValidity) validities.get(i);
            switch(validity.isValid()) {
                case -1:
                    // invalid : stop examining
                    return -1;
                case 1:
                    // valid : just continue to next source
                    break;
                case 0:
                    // don't know : check with the new source
                    if (resolver == null) {
                        // we have no resolver : definitely don't know (need to have one)
                        return 0;
                    }
                    try {
                        Source newSrc = resolver.resolveURI((String) uris.get(i));
                        int value = validity.isValid(newSrc.getValidity());
                        resolver.release(newSrc);
                        if (value != 1) {
                            return -1;
                        }
                    } catch(IOException ioe) {

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