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/*
* See LICENSE file in distribution for copyright and licensing information.
*/
package org.yaml.snakeyaml.serializer;
import java.io.IOException;
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.emitter.Emitter;
import org.yaml.snakeyaml.events.AliasEvent;
import org.yaml.snakeyaml.events.DocumentEndEvent;
import org.yaml.snakeyaml.events.DocumentStartEvent;
import org.yaml.snakeyaml.events.MappingEndEvent;
import org.yaml.snakeyaml.events.MappingStartEvent;
import org.yaml.snakeyaml.events.ScalarEvent;
import org.yaml.snakeyaml.events.SequenceEndEvent;
import org.yaml.snakeyaml.events.SequenceStartEvent;
import org.yaml.snakeyaml.events.StreamEndEvent;
import org.yaml.snakeyaml.events.StreamStartEvent;
import org.yaml.snakeyaml.nodes.CollectionNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeId;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.resolver.Resolver;
/**
* @see <a href="http://pyyaml.org/wiki/PyYAML">PyYAML</a> for more information
*/
public final class Serializer {
private final Emitter emitter;
private final Resolver resolver;
private boolean explicitStart;
private boolean explicitEnd;
private Integer[] useVersion;
private Map<String, String> useTags;
private Set<Node> serializedNodes;
private Map<Node, String> anchors;
private int lastAnchorId;
private Boolean closed;
private String explicitRoot;
public Serializer(Emitter emitter, Resolver resolver, DumperOptions opts) {
this.emitter = emitter;
this.resolver = resolver;
this.explicitStart = opts.isExplicitStart();
this.explicitEnd = opts.isExplicitEnd();
if (opts.getVersion() != null) {
this.useVersion = opts.getVersion().getArray();
}
this.useTags = opts.getTags();
this.serializedNodes = new HashSet<Node>();
this.anchors = new HashMap<Node, String>();
this.lastAnchorId = 0;
this.closed = null;
this.explicitRoot = opts.getExplicitRoot();
}
public void open() throws IOException {
if (closed == null) {
this.emitter.emit(new StreamStartEvent(null, null));
this.closed = Boolean.FALSE;
} else if (Boolean.TRUE.equals(closed)) {
throw new SerializerException("serializer is closed");
} else {
throw new SerializerException("serializer is already opened");
}
}
public void close() throws IOException {
if (closed == null) {
throw new SerializerException("serializer is not opened");
} else if (!Boolean.TRUE.equals(closed)) {
this.emitter.emit(new StreamEndEvent(null, null));
this.closed = Boolean.TRUE;
}
}
public void serialize(Node node) throws IOException {
if (closed == null) {
throw new SerializerException("serializer is not opened");
} else if (closed) {
throw new SerializerException("serializer is closed");
}
this.emitter.emit(new DocumentStartEvent(null, null, this.explicitStart, this.useVersion,
useTags));
anchorNode(node);
if (explicitRoot != null) {
node.setTag(explicitRoot);
}
serializeNode(node, null, null);
this.emitter.emit(new DocumentEndEvent(null, null, this.explicitEnd));
this.serializedNodes.clear();
this.anchors.clear();
this.lastAnchorId = 0;
}
@SuppressWarnings("unchecked")
private void anchorNode(Node node) {
if (this.anchors.containsKey(node)) {
String anchor = this.anchors.get(node);
if (null == anchor) {
anchor = generateAnchor();
this.anchors.put(node, anchor);
}
} else {
this.anchors.put(node, null);
switch (node.getNodeId()) {
case sequence:
List<Node> list = (List<Node>) node.getValue();
for (Node item : list) {
anchorNode(item);
}
break;
case mapping:
List<Object[]> map = (List<Object[]>) node.getValue();
for (Object[] object : map) {
Node key = (Node) object[0];
Node value = (Node) object[1];
anchorNode(key);
anchorNode(value);
}
break;
}
}
}
private String generateAnchor() {
this.lastAnchorId++;
NumberFormat format = NumberFormat.getNumberInstance();
format.setMinimumIntegerDigits(3);
String anchorId = format.format(this.lastAnchorId);
return "id" + anchorId;
}
@SuppressWarnings("unchecked")
private void serializeNode(Node node, Node parent, Object index) throws IOException {
String tAlias = this.anchors.get(node);
if (this.serializedNodes.contains(node)) {
this.emitter.emit(new AliasEvent(tAlias, null, null));
} else {
this.serializedNodes.add(node);
// this.resolver.descendResolver(parent, index);
switch (node.getNodeId()) {
case scalar:
String detectedTag = this.resolver.resolve(NodeId.scalar, (String) node.getValue(),
true);
String defaultTag = this.resolver.resolve(NodeId.scalar, (String) node.getValue(),
false);
boolean[] implicit = new boolean[] { false, false };
implicit[0] = node.getTag().equals(detectedTag);
implicit[1] = node.getTag().equals(defaultTag);
ScalarEvent event = new ScalarEvent(tAlias, node.getTag(), implicit, (String) node
.getValue(), null, null, ((ScalarNode) node).getStyle());
this.emitter.emit(event);
break;
case sequence:
boolean implicitS = (node.getTag().equals(this.resolver.resolve(NodeId.sequence,
null, true)));
this.emitter.emit(new SequenceStartEvent(tAlias, node.getTag(), implicitS, null,
null, ((CollectionNode) node).getFlowStyle()));
int indexCounter = 0;
List<Node> list = (List<Node>) node.getValue();
for (Node item : list) {
serializeNode(item, node, new Integer(indexCounter));
indexCounter++;
}
this.emitter.emit(new SequenceEndEvent(null, null));
break;
default:// instance of MappingNode
String implicitTag = this.resolver.resolve(NodeId.mapping, null, true);
boolean implicitM = (node.getTag().equals(implicitTag));
this.emitter.emit(new MappingStartEvent(tAlias, node.getTag(), implicitM, null,
null, ((CollectionNode) node).getFlowStyle()));
List<Object[]> map = (List<Object[]>) node.getValue();
for (Object[] row : map) {
Node key = (Node) row[0];
Node value = (Node) row[1];
serializeNode(key, node, null);
serializeNode(value, node, key);
}
this.emitter.emit(new MappingEndEvent(null, null));
}
}
}
}
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