Java tutorial
/** * Copyright (c) 2015 MapR, Inc. * * 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.ojai.beans.jackson; import com.fasterxml.jackson.core.*; import org.ojai.Document; import org.ojai.DocumentBuilder; import org.ojai.annotation.API; import org.ojai.types.ODate; import org.ojai.types.OInterval; import org.ojai.types.OTime; import org.ojai.types.OTimestamp; import java.io.IOException; import java.io.InputStream; import java.math.BigDecimal; import java.math.BigInteger; import java.nio.ByteBuffer; import java.util.Stack; @API.Internal public class DocumentGenerator extends JsonGenerator { protected final DocumentBuilder b; protected final Stack<Boolean> mapCtxts; protected boolean closed = false; protected String currFieldName; protected ObjectCodec objectCodec; public DocumentGenerator(DocumentBuilder db) { b = db; mapCtxts = new Stack<Boolean>(); } public Document getDocument() { return b.getDocument(); } @Override public void flush() throws IOException { /*no-op*/ } @Override public void close() throws IOException { closed = true; } @Override public boolean isClosed() { return closed; } @Override public JsonGenerator disable(Feature feature) { return this; } @Override public JsonGenerator enable(Feature feature) { return this; } @Override public ObjectCodec getCodec() { return objectCodec; } @Override public JsonGenerator setCodec(ObjectCodec c) { objectCodec = c; return this; } @Override public JsonStreamContext getOutputContext() { return null; } @Override public JsonGenerator useDefaultPrettyPrinter() { return this; } @Override public Version version() { return JacksonHelper.VERSION; } @Override public void writeBinary(Base64Variant bv, byte[] data, int offset, int len) throws IOException { ByteBuffer buff = ByteBuffer.wrap(data, offset, len); if (inMap()) { b.put(currFieldName, buff); } else { b.add(buff); } } @Override public void writeBoolean(boolean value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeEndArray() throws IOException { b.endArray(); mapCtxts.pop(); } @Override public void writeEndObject() throws IOException { b.endMap(); mapCtxts.pop(); } @Override public void writeFieldName(String fieldName) throws IOException { currFieldName = fieldName; } @Override public void writeFieldName(SerializableString fieldName) throws IOException { currFieldName = fieldName.getValue(); } @Override public void writeNull() throws IOException { if (inMap()) { b.putNull(currFieldName); } else { b.addNull(); } } @Override public void writeNumber(short value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(int value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(long value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(BigInteger value) throws IOException { if (inMap()) { b.put(currFieldName, new BigDecimal(value)); } else { b.add(new BigDecimal(value)); } } @Override public void writeNumber(double value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(float value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(BigDecimal value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeNumber(String value) throws IOException { if (value.contains(".")) { writeNumber(Double.valueOf(value)); } else { writeNumber(Long.valueOf(value)); } } @Override public void writeObject(Object value) throws IOException { if (value instanceof Byte) { if (inMap()) { b.put(currFieldName, ((Byte) value).byteValue()); } else { b.add(((Byte) value).byteValue()); } } else if (value instanceof OInterval) { if (inMap()) { b.put(currFieldName, ((OInterval) value)); } else { b.add(((OInterval) value)); } } else if (value instanceof ODate) { if (inMap()) { b.put(currFieldName, ((ODate) value)); } else { b.add(((ODate) value)); } } else if (value instanceof OTime) { if (inMap()) { b.put(currFieldName, ((OTime) value)); } else { b.add(((OTime) value)); } } else if (value instanceof OTimestamp) { if (inMap()) { b.put(currFieldName, ((OTimestamp) value)); } else { b.add(((OTimestamp) value)); } } else { throw new IllegalStateException("writeObject() called for type " + value.getClass()); } } @Override public void writeStartArray() throws IOException { if (inMap()) { b.putNewArray(currFieldName); } else { b.addNewArray(); } mapCtxts.push(false); } @Override public void writeStartObject() throws IOException { if (inMap()) { b.putNewMap(currFieldName); } else { b.addNewMap(); } mapCtxts.push(true); } @Override public void writeString(String value) throws IOException { if (inMap()) { b.put(currFieldName, value); } else { b.add(value); } } @Override public void writeString(SerializableString value) throws IOException { writeString(value.getValue()); } @Override public void writeString(char[] text, int offset, int len) throws IOException { writeString(new String(text, offset, len)); } @Override public void writeUTF8String(byte[] text, int offset, int length) throws IOException { writeString(new String(text, offset, length, "UTF-8")); } @Override public void writeTree(TreeNode rootNode) throws IOException { if (rootNode == null) { writeNull(); } else { if (objectCodec == null) { throw new IllegalStateException("No ObjectCodec defined"); } objectCodec.writeValue(this, rootNode); } } @Override public int getFeatureMask() { notImplemented(); return 0; } @Override public boolean isEnabled(Feature feature) { notImplemented(); return false; } @Override public JsonGenerator setFeatureMask(int featureMask) { notImplemented(); return this; } @Override public int writeBinary(Base64Variant bv, InputStream data, int dataLength) throws IOException { notImplemented(); return 0; } @Override public void writeRaw(String value) throws IOException { notImplemented(); } @Override public void writeRaw(char value) throws IOException { notImplemented(); } @Override public void writeRaw(String text, int offset, int len) throws IOException { notImplemented(); } @Override public void writeRaw(char[] text, int offset, int len) throws IOException { notImplemented(); } @Override public void writeRawUTF8String(byte[] text, int offset, int length) throws IOException { notImplemented(); } @Override public void writeRawValue(String value) throws IOException { notImplemented(); } @Override public void writeRawValue(String text, int offset, int len) throws IOException { notImplemented(); } @Override public void writeRawValue(char[] text, int offset, int len) throws IOException { notImplemented(); } private void notImplemented() { throw new RuntimeException("Called operation not implemented for DocumentGenerator."); } private boolean inMap() { return !mapCtxts.isEmpty() && mapCtxts.peek(); } }