com.ibm.ws.lars.rest.model.RepositoryObjectList.java Source code

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Here is the source code for com.ibm.ws.lars.rest.model.RepositoryObjectList.java

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/*******************************************************************************
 * Copyright (c) 2015 IBM Corp.
 *
 * 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 com.ibm.ws.lars.rest.model;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ibm.ws.lars.rest.exceptions.InvalidJsonAssetException;

/**
 *
 */
public abstract class RepositoryObjectList<T> {
    private static ObjectMapper reader = new ObjectMapper();
    private static ObjectMapper writer = new ObjectMapper();

    protected final List<Map<String, Object>> state;

    protected RepositoryObjectList(List<Map<String, Object>> state) {
        if (state != null) {
            this.state = state;
        } else {
            this.state = new ArrayList<Map<String, Object>>();
        }
    }

    public List<Map<String, Object>> getState() {
        return state;
    }

    public String toJson() throws JsonProcessingException {
        return writer.writeValueAsString(this.state);
    }

    public int size() {
        return state.size();
    }

    public T get(int i) {
        return wrapState(state.get(i));
    }

    protected abstract T wrapState(Map<String, Object> props);

    public boolean isEmpty() {
        return size() == 0;
    }

    protected static List<Map<String, Object>> readJsonState(String json) throws InvalidJsonAssetException {
        try {
            return reader.readValue(json, new TypeReference<List<Map<String, Object>>>() {
            });
        } catch (JsonParseException e) {
            throw new InvalidJsonAssetException(e);
        } catch (JsonMappingException e) {
            throw new InvalidJsonAssetException(e);
        } catch (IOException e) {
            // No idea what would cause this.
            throw new InvalidJsonAssetException(e);
        }
    }

    protected static List<Map<String, Object>> readJsonState(byte[] json) throws InvalidJsonAssetException {
        try {
            return reader.readValue(json, new TypeReference<List<Map<String, Object>>>() {
            });
        } catch (JsonParseException e) {
            throw new InvalidJsonAssetException(e);
        } catch (JsonMappingException e) {
            throw new InvalidJsonAssetException(e);
        } catch (IOException e) {
            // No idea what would cause this.
            throw new InvalidJsonAssetException(e);
        }
    }
}