VarsElement.java

/* 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.esigate.extension.parallelesi;

import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.esigate.HttpErrorPage;
import org.esigate.parser.future.CharSequenceFuture;
import org.esigate.parser.future.FutureElementType;
import org.esigate.parser.future.FutureParserContext;
import org.esigate.parser.future.StringBuilderFutureAppendable;
import org.esigate.vars.VariablesResolver;

class VarsElement extends BaseElement {
    public static final FutureElementType TYPE = new BaseElementType("<esi:vars", "</esi:vars") {
        @Override
        public VarsElement newInstance() {
            return new VarsElement();
        }

    };

    private StringBuilderFutureAppendable buf = new StringBuilderFutureAppendable();

    VarsElement() {
    }

    @Override
    public void characters(Future<CharSequence> csq) {
        buf.enqueueAppend(csq);
    }

    @Override
    public void onTagEnd(String tag, FutureParserContext ctx) throws IOException, HttpErrorPage {
        buf.performAppends();
        String result;
        try {
            result = VariablesResolver.replaceAllVariables(buf.get().toString(), ctx.getHttpRequest());
        } catch (ExecutionException e) {
            if (e.getCause() instanceof HttpErrorPage) {
                throw (HttpErrorPage) e.getCause();
            }
            throw new IOException(e);
        }
        ctx.getCurrent().characters(new CharSequenceFuture(result));
    }

}