/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.switchyard.config.model;
import static javax.xml.XMLConstants.XMLNS_ATTRIBUTE;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.switchyard.config.Configuration;
/**
* A {@link Scanner} that merges all {@link Model}s from other Scanners into one.
*
* @param <M> the Model type to scan for (and merge)
*
* @author David Ward <<a href="mailto:dward@jboss.org">dward@jboss.org</a>> (C) 2011 Red Hat Inc.
*/
public class MergeScanner<M extends Model> implements Scanner<M> {
private final boolean _fromOverridesTo;
private final List<Scanner<M>> _scanners;
/**
* Constructs a new MergeScanner using the specified parameters.
* @param fromOverridesTo whether or not each successfully merged Model's values will override the next Model to merge values
* @param scanners the Scanners to merge output from
*/
public MergeScanner(boolean fromOverridesTo, Scanner<M>... scanners) {
_fromOverridesTo = fromOverridesTo;
List<Scanner<M>> list = new ArrayList<Scanner<M>>();
if (scanners != null) {
for (Scanner<M> scanner : scanners) {
if (scanner != null) {
list.add(scanner);
}
}
}
_scanners = list;
}
/**
* Constructs a new MergeScanner using the specified parameters.
* @param fromOverridesTo whether or not each successfully merged Model's values will override the next Model to merge values
* @param scanners the Scanners to merge output from
*/
public MergeScanner(boolean fromOverridesTo, List<Scanner<M>> scanners) {
_fromOverridesTo = fromOverridesTo;
_scanners = new ArrayList<Scanner<M>>();
if (scanners != null) {
for (Scanner<M> scanner : scanners) {
if (scanner != null) {
_scanners.add(scanner);
}
}
}
}
/**
* {@inheritDoc}
*/
@Override
public ScannerOutput<M> scan(ScannerInput<M> input) throws IOException {
M merged = null;
for (Scanner<M> scanner : _scanners) {
ScannerOutput<M> scannerOutput = scanner.scan(input);
if (scannerOutput != null) {
List<M> scanned_list = scannerOutput.getModels();
if (scanned_list != null) {
for (M scanned : scanned_list) {
if (scanned != null) {
if (merged == null) {
merged = scanned;
} else {
merged = Models.merge(scanned, merged, _fromOverridesTo);
}
}
}
}
}
}
Configuration config = merged.getModelConfiguration();
final String xmlns_x2 = XMLNS_ATTRIBUTE + ":" + XMLNS_ATTRIBUTE;
if (config.hasAttribute(xmlns_x2)) {
String xmlns = config.getAttribute(xmlns_x2);
config.setAttribute(xmlns_x2, null);
config.setAttribute(XMLNS_ATTRIBUTE, xmlns);
}
return new ScannerOutput<M>().setModel(merged);
}
}