org.apache.geode.pdx.PdxReader Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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.apache.geode.pdx;
import java.util.Date;
/**
* A PdxReader will be passed to {@link PdxSerializable#fromData(PdxReader) fromData} or
* {@link PdxSerializer#fromData(Class, PdxReader) PdxSerializer fromData} by GemFire during
* deserialization of a PDX. The domain class needs to deserialize field members using this
* interface. This interface is implemented by GemFire. Each readXXX call will return the field's
* value. If the serialized PDX does not contain the named field then a default value will be
* returned. Standard Java defaults are used. For Objects this is null and for
* primitives it is 0 or 0.0.
*
* You must read fields in the same order they were written by {@link PdxWriter}.
*
* The methods on this interface are not thread safe so do not call them concurrently, on the same
* instance, from more than one thread.
*
* @since GemFire 6.6
*/
public interface PdxReader {
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a char
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public char readChar(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* boolean field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public boolean readBoolean(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a byte
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public byte readByte(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a short
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public short readShort(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a int
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public int readInt(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a long
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public long readLong(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a float
* field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public float readFloat(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* double field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public double readDouble(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* String field.
* @throws PdxSerializationException if deserialization of the field fails.
*/
public String readString(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not an
* Object field.
*/
public Object readObject(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* char[] field.
*/
public char[] readCharArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* boolean[] field.
*/
public boolean[] readBooleanArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* byte[] field.
*/
public byte[] readByteArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* short[] field.
*/
public short[] readShortArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a int[]
* field.
*/
public int[] readIntArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* long[] field.
*/
public long[] readLongArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* float[] field.
*/
public float[] readFloatArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* double[] field.
*/
public double[] readDoubleArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* String[] field.
*/
public String[] readStringArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* Object[] field.
*/
public Object[] readObjectArray(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a
* byte[][] field.
*/
public byte[][] readArrayOfByteArrays(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
* @throws PdxFieldTypeMismatchException if the named field exists and is not a Date
* field.
*/
public Date readDate(String fieldName);
/**
* Checks if the named field exists and returns the result.
*
* This can be useful when writing code that handles more than one version of a PDX class.
*
* @param fieldName the name of the field to check
* @return true if the named field exists; otherwise false
*/
public boolean hasField(String fieldName);
/**
* Checks if the named field was {@link PdxWriter#markIdentityField(String) marked} as an identity
* field.
*
* Note that if no fields have been marked then all the fields are used as identity fields even
* though this method will return false since none of them have been marked.
*
* @param fieldName the name of the field to check
* @return true if the named field exists and was marked as an identify field;
* otherwise false
*/
public boolean isIdentityField(String fieldName);
/**
* Reads the named field and returns its value.
*
* @param fieldName the name of the field to read
* @return the value of the field if the field exists; otherwise a default value
* @throws PdxSerializationException if deserialization of the field fails.
*/
public Object readField(String fieldName);
/**
* This method returns an object that represents all the unread fields which must be passed to
* {@link PdxWriter#writeUnreadFields(PdxUnreadFields) writeUnreadFields} in the toData code.
*
* Note that if {@link org.apache.geode.cache.CacheFactory#setPdxIgnoreUnreadFields(boolean)
* setPdxIgnoreUnreadFields} or
* {@link org.apache.geode.cache.client.ClientCacheFactory#setPdxIgnoreUnreadFields(boolean)
* client setPdxIgnoreUnreadFields} are set to true then this method will always
* return an object that has no unread fields.
*
* @return an object that represents the unread fields.
*/
public PdxUnreadFields readUnreadFields();
}