001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.core.operations.stack;
020
021import org.nuxeo.ecm.automation.OperationContext;
022import org.nuxeo.ecm.automation.OperationException;
023import org.nuxeo.ecm.automation.core.Constants;
024import org.nuxeo.ecm.automation.core.annotations.Context;
025import org.nuxeo.ecm.automation.core.annotations.Operation;
026import org.nuxeo.ecm.automation.core.annotations.OperationMethod;
027import org.nuxeo.ecm.core.api.Blob;
028
029/**
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032@Operation(id = PullBlob.ID, category = Constants.CAT_EXECUTION_STACK, label = "Pull File", description = "Restore the last saved input file in the context input stack. This operation must be used only if a PUSH operation was previously made. Return the first <i>pushed</i> file.", aliases = { "Blob.Pull" })
033public class PullBlob {
034
035    public static final String ID = "Context.PullBlob";
036
037    @Context
038    protected OperationContext ctx;
039
040    @OperationMethod
041    public Blob run() throws OperationException {
042        Object obj = ctx.pull(Constants.O_BLOB);
043        if (obj instanceof Blob) {
044            return (Blob) obj;
045        }
046        throw new OperationException(
047                "Illegal state error for pull file operation. The context stack doesn't contains a file on its bottom");
048    }
049
050}