/*
* (C) Copyright 2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser General Public License
* (LGPL) version 2.1 which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Contributors:
* Nuxeo - initial API and implementation
*
* $Id: DownloadMethodExpression.java 28491 2008-01-04 19:04:30Z sfermigier $
*/
package org.nuxeo.ecm.platform.ui.web.binding;
import java.io.Serializable;
import javax.el.ELContext;
import javax.el.MethodExpression;
import javax.el.MethodInfo;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import org.nuxeo.ecm.core.api.Blob;
import org.nuxeo.ecm.platform.ui.web.util.ComponentUtils;
/**
* Download method expression for blobs.
*
* @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
*/
public class DownloadMethodExpression extends MethodExpression implements
Serializable {
private static final long serialVersionUID = 9010857019674405375L;
private final ValueExpression blobExpression;
private final ValueExpression fileNameExpression;
public DownloadMethodExpression(ValueExpression blobExpression,
ValueExpression fileNameExpression) {
this.blobExpression = blobExpression;
this.fileNameExpression = fileNameExpression;
}
// Expression interface
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof DownloadMethodExpression)) {
return false;
}
DownloadMethodExpression other = (DownloadMethodExpression) o;
if (blobExpression != null ? !blobExpression.equals(other.blobExpression)
: other.blobExpression != null) {
return false;
}
if (fileNameExpression != null ? !fileNameExpression.equals(other.fileNameExpression)
: other.fileNameExpression != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = blobExpression != null ? blobExpression.hashCode() : 0;
result = 31 * result
+ (fileNameExpression != null ? fileNameExpression.hashCode()
: 0);
return result;
}
@Override
public String getExpressionString() {
// return only the blob one
return blobExpression == null ? null
: blobExpression.getExpressionString();
}
@Override
public boolean isLiteralText() {
return blobExpression == null ? null : blobExpression.isLiteralText();
}
// MethodExpression interface
@Override
public MethodInfo getMethodInfo(ELContext context) {
return null;
}
@Override
public Object invoke(ELContext context, Object[] params) {
FacesContext faces = FacesContext.getCurrentInstance();
Blob blob = getBlob(context);
String filename = getFilename(context);
return ComponentUtils.download(faces, blob, filename);
}
protected String getFilename(ELContext context) {
if (fileNameExpression == null) {
return null;
} else {
return (String) fileNameExpression.getValue(context);
}
}
protected Blob getBlob(ELContext context) {
if (blobExpression == null) {
return null;
} else {
return (Blob) blobExpression.getValue(context);
}
}
}