com.arangodb.velocypack.ObjectIterator Maven / Gradle / Ivy
/*
* DISCLAIMER
*
* Copyright 2016 ArangoDB GmbH, Cologne, Germany
*
* 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.
*
* Copyright holder is ArangoDB GmbH, Cologne, Germany
*/
package com.arangodb.velocypack;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import com.arangodb.velocypack.exception.VPackKeyTypeException;
import com.arangodb.velocypack.exception.VPackNeedAttributeTranslatorException;
import com.arangodb.velocypack.exception.VPackValueTypeException;
/**
* @author Mark Vollmary
*
*/
public class ObjectIterator extends SliceIterator> {
public ObjectIterator(final VPackSlice slice) throws VPackValueTypeException {
super(slice);
if (!slice.isObject()) {
throw new VPackValueTypeException(ValueType.OBJECT);
}
if (size > 0) {
final byte head = slice.head();
if (head == 0x14) {
current = slice.keyAt(0).getStart();
} else {
current = slice.getStart() + slice.findDataOffset();
}
}
}
@Override
public Entry next() {
if (position++ > 0) {
if (position <= size && current != 0) {
// skip over key
current += getCurrent().getByteSize();
// skip over value
current += getCurrent().getByteSize();
} else {
throw new NoSuchElementException();
}
}
final VPackSlice currentField = getCurrent();
return new Entry() {
@Override
public VPackSlice setValue(final VPackSlice value) {
throw new UnsupportedOperationException();
}
@Override
public VPackSlice getValue() {
return new VPackSlice(currentField.getBuffer(), currentField.getStart() + currentField.getByteSize());
}
@Override
public String getKey() {
try {
return currentField.makeKey().getAsString();
} catch (final VPackKeyTypeException | VPackNeedAttributeTranslatorException e) {
throw new NoSuchElementException();
}
}
};
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}