com.damnhandy.uri.template.JsonVarExploder.java Source code

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Here is the source code for com.damnhandy.uri.template.JsonVarExploder.java

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/*
 * Copyright 2012, Ryan J. McDonough
 *
 * 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.damnhandy.uri.template;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Collection;
import java.util.Map;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * An example exploder that reads JSON data and explodes into a URI expression.
 *
 * @author <a href="ryan@damnhandy.com">Ryan J. McDonough</a>
 * @version $Revision: 1.1 $
 */
public class JsonVarExploder implements VarExploder {

    private InputStream source;

    private Map<String, Object> values;

    /**
     *
     * Create a new JsonVarExploder.
     *
     * @param file
     * @throws FileNotFoundException
     */
    public JsonVarExploder(File file) throws FileNotFoundException, VarExploderException {
        this(new FileInputStream(file));
    }

    public JsonVarExploder(String jsonText) throws VarExploderException, UnsupportedEncodingException {
        this(new ByteArrayInputStream(jsonText.getBytes("UTF-8")));
    }

    /**
     *
     */
    @Override
    public Collection<Object> getValues() throws VarExploderException {
        return values.values();
    }

    /**
     *
     * Create a new JsonVarExploder.
     *
     * @param in
     */
    public JsonVarExploder(InputStream in) throws VarExploderException {
        this.source = in;
        initValues();
    }

    private void initValues() throws VarExploderException {
        ObjectMapper mapper = new ObjectMapper();
        try {
            values = mapper.readValue(source, new TypeReference<Map<String, Object>>() {
            });
        } catch (JsonParseException e) {
            throw new VarExploderException(e);
        } catch (JsonMappingException e) {
            throw new VarExploderException(e);
        } catch (IOException e) {
            throw new VarExploderException(e);
        }
    }

    @Override
    public Map<String, Object> getNameValuePairs() throws VarExploderException {
        return values;
    }

}